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ltdl.c Go to the documentation of this file. /* ltdl.c -- system independent dlopen wrapper Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc. Originally by Thomas Tanner <tanner@ffii.org> This file is part of GNU Libtool. This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. As a special exception to the GNU Lesser General Public License, if you distribute this file as part of a program or library that is built using GNU libtool, you may include it under the same distribution terms that you use for the rest of that program. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #if HAVE_CONFIG_H # include <config.h> #endif #if HAVE_UNISTD_H # include <unistd.h> #endif #if HAVE_STDIO_H # include <stdio.h> #endif #if HAVE_STDLIB_H # include <stdlib.h> #endif #if HAVE_STRING_H # include <string.h> #else # if HAVE_STRINGS_H # include <strings.h> # endif #endif #if HAVE_CTYPE_H # include <ctype.h> #endif #if HAVE_MALLOC_H # include <malloc.h> #endif #if HAVE_MEMORY_H # include <memory.h> #endif #if HAVE_ERRNO_H # include <errno.h> #endif #if HAVE_DIRENT_H # include <dirent.h> # define LT_D_NAMLEN(dirent) (strlen((dirent)->d_name)) #else # define dirent direct # define LT_D_NAMLEN(dirent) ((dirent)->d_namlen) # if HAVE_SYS_NDIR_H # include <sys/ndir.h> # endif # if HAVE_SYS_DIR_H # include <sys/dir.h> # endif # if HAVE_NDIR_H # include <ndir.h> # endif #endif #if HAVE_ARGZ_H # include <argz.h> #endif #if HAVE_ASSERT_H # include <assert.h> #else # define assert(arg) ((void) 0) #endif #include "ltdl.h"  /* --- WINDOWS SUPPORT --- */ #ifdef DLL_EXPORT # define LT_GLOBAL_DATA __declspec(dllexport) #else # define LT_GLOBAL_DATA #endif /* fopen() mode flags for reading a text file */ #undef LT_READTEXT_MODE #ifdef __WINDOWS__ # define LT_READTEXT_MODE "rt" #else # define LT_READTEXT_MODE "r" #endif  /* --- MANIFEST CONSTANTS --- */ /* Standard libltdl search path environment variable name */ #undef LTDL_SEARCHPATH_VAR #define LTDL_SEARCHPATH_VAR "LTDL_LIBRARY_PATH" /* Standard libtool archive file extension. */ #undef LTDL_ARCHIVE_EXT #define LTDL_ARCHIVE_EXT ".la" /* max. filename length */ #ifndef LT_FILENAME_MAX # define LT_FILENAME_MAX 1024 #endif /* This is the maximum symbol size that won't require malloc/free */ #undef LT_SYMBOL_LENGTH #define LT_SYMBOL_LENGTH 128 /* This accounts for the _LTX_ separator */ #undef LT_SYMBOL_OVERHEAD #define LT_SYMBOL_OVERHEAD 5  /* --- MEMORY HANDLING --- */ /* These are the functions used internally. In addition to making use of the associated function pointers above, they also perform error handling. */ static char *lt_estrdup LT_PARAMS((const char *str)); static lt_ptr lt_emalloc LT_PARAMS((size_t size)); static lt_ptr lt_erealloc LT_PARAMS((lt_ptr addr, size_t size)); static lt_ptr rpl_realloc LT_PARAMS((lt_ptr ptr, size_t size)); /* These are the pointers that can be changed by the caller: */ LT_GLOBAL_DATA lt_ptr (*lt_dlmalloc) LT_PARAMS((size_t size)) = (lt_ptr (*) LT_PARAMS((size_t))) malloc; LT_GLOBAL_DATA lt_ptr (*lt_dlrealloc) LT_PARAMS((lt_ptr ptr, size_t size)) = (lt_ptr (*) LT_PARAMS((lt_ptr, size_t))) rpl_realloc; LT_GLOBAL_DATA void (*lt_dlfree) LT_PARAMS((lt_ptr ptr)) = (void (*) LT_PARAMS((lt_ptr))) free; /* The following macros reduce the amount of typing needed to cast assigned memory. */ #define LT_DLMALLOC(tp, n) ((tp *) lt_dlmalloc ((n) * sizeof(tp))) #define LT_DLREALLOC(tp, p, n) ((tp *) rpl_realloc ((p), (n) * sizeof(tp))) #define LT_DLFREE(p) \ LT_STMT_START { if (p) (p) = (lt_dlfree (p), (lt_ptr) 0); } LT_STMT_END #define LT_EMALLOC(tp, n) ((tp *) lt_emalloc ((n) * sizeof(tp))) #define LT_EREALLOC(tp, p, n) ((tp *) lt_erealloc ((p), (n) * sizeof(tp))) #define LT_DLMEM_REASSIGN(p, q) LT_STMT_START { \ if ((p) != (q)) { lt_dlfree (p); (p) = (q); (q) = 0; } \ } LT_STMT_END  /* --- REPLACEMENT FUNCTIONS --- */ #undef strdup #define strdup rpl_strdup static char *strdup LT_PARAMS((const char *str)); char * strdup(str) const char *str; { char *tmp = 0; if (str) { tmp = LT_DLMALLOC (char, 1+ strlen (str)); if (tmp) { strcpy(tmp, str); } } return tmp; } #if ! HAVE_STRCMP #undef strcmp #define strcmp rpl_strcmp static int strcmp LT_PARAMS((const char *str1, const char *str2)); int strcmp (str1, str2) const char *str1; const char *str2; { if (str1 == str2) return 0; if (str1 == 0) return -1; if (str2 == 0) return 1; for (;*str1 && *str2; ++str1, ++str2) { if (*str1 != *str2) break; } return (int)(*str1 - *str2); } #endif #if ! HAVE_STRCHR # if HAVE_INDEX # define strchr index # else # define strchr rpl_strchr static const char *strchr LT_PARAMS((const char *str, int ch)); const char* strchr(str, ch) const char *str; int ch; { const char *p; for (p = str; *p != (char)ch && *p != LT_EOS_CHAR; ++p) /*NOWORK*/; return (*p == (char)ch) ? p : 0; } # endif #endif /* !HAVE_STRCHR */ #if ! HAVE_STRRCHR # if HAVE_RINDEX # define strrchr rindex # else # define strrchr rpl_strrchr static const char *strrchr LT_PARAMS((const char *str, int ch)); const char* strrchr(str, ch) const char *str; int ch; { const char *p, *q = 0; for (p = str; *p != LT_EOS_CHAR; ++p) { if (*p == (char) ch) { q = p; } } return q; } # endif #endif /* NOTE: Neither bcopy nor the memcpy implementation below can reliably handle copying in overlapping areas of memory. Use memmove (for which there is a fallback implmentation below) if you need that behaviour. */ #if ! HAVE_MEMCPY # if HAVE_BCOPY # define memcpy(dest, src, size) bcopy (src, dest, size) # else # define memcpy rpl_memcpy static lt_ptr memcpy LT_PARAMS((lt_ptr dest, const lt_ptr src, size_t size)); lt_ptr memcpy (dest, src, size) lt_ptr dest; const lt_ptr src; size_t size; { size_t i = 0; for (i = 0; i < size; ++i) { dest[i] = src[i]; } return dest; } # endif /* !HAVE_BCOPY */ #endif /* !HAVE_MEMCPY */ #if ! HAVE_MEMMOVE # define memmove rpl_memmove static lt_ptr memmove LT_PARAMS((lt_ptr dest, const lt_ptr src, size_t size)); lt_ptr memmove (dest, src, size) lt_ptr dest; const lt_ptr src; size_t size; { size_t i; if (dest < src) for (i = 0; i < size; ++i) { dest[i] = src[i]; } else if (dest > src) for (i = size -1; i >= 0; --i) { dest[i] = src[i]; } return dest; } #endif /* !HAVE_MEMMOVE */ /* According to Alexandre Oliva <oliva@lsd.ic.unicamp.br>, ``realloc is not entirely portable'' In any case we want to use the allocator supplied by the user without burdening them with an lt_dlrealloc function pointer to maintain. Instead implement our own version (with known boundary conditions) using lt_dlmalloc and lt_dlfree. */ #undef realloc #define realloc rpl_realloc lt_ptr realloc (ptr, size) lt_ptr ptr; size_t size; { if (size <= 0) { /* For zero or less bytes, free the original memory */ if (ptr != 0) { lt_dlfree (ptr); } return (lt_ptr) 0; } else if (ptr == 0) { /* Allow reallocation of a NULL pointer. */ return lt_dlmalloc (size); } else { /* Allocate a new block, copy and free the old block. */ lt_ptr mem = lt_dlmalloc (size); if (mem) { memcpy (mem, ptr, size); lt_dlfree (ptr); } /* Note that the contents of PTR are not damaged if there is insufficient memory to realloc. */ return mem; } } #if ! HAVE_ARGZ_APPEND # define argz_append rpl_argz_append static error_t argz_append LT_PARAMS((char **pargz, size_t *pargz_len, const char *buf, size_t buf_len)); error_t argz_append (pargz, pargz_len, buf, buf_len) char **pargz; size_t *pargz_len; const char *buf; size_t buf_len; { size_t argz_len; char *argz; assert (pargz); assert (pargz_len); assert ((*pargz && *pargz_len) || (!*pargz && !*pargz_len)); /* If nothing needs to be appended, no more work is required. */ if (buf_len == 0) return 0; /* Ensure there is enough room to append BUF_LEN. */ argz_len = *pargz_len + buf_len; argz = LT_DLREALLOC (char, *pargz, argz_len); if (!argz) return ENOMEM; /* Copy characters from BUF after terminating '\0' in ARGZ. */ memcpy (argz + *pargz_len, buf, buf_len); /* Assign new values. */ *pargz = argz; *pargz_len = argz_len; return 0; } #endif /* !HAVE_ARGZ_APPEND */ #if ! HAVE_ARGZ_CREATE_SEP # define argz_create_sep rpl_argz_create_sep static error_t argz_create_sep LT_PARAMS((const char *str, int delim, char **pargz, size_t *pargz_len)); error_t argz_create_sep (str, delim, pargz, pargz_len) const char *str; int delim; char **pargz; size_t *pargz_len; { size_t argz_len; char *argz = 0; assert (str); assert (pargz); assert (pargz_len); /* Make a copy of STR, but replacing each occurence of DELIM with '\0'. */ argz_len = 1+ LT_STRLEN (str); if (argz_len) { const char *p; char *q; argz = LT_DLMALLOC (char, argz_len); if (!argz) return ENOMEM; for (p = str, q = argz; *p != LT_EOS_CHAR; ++p) { if (*p == delim) { /* Ignore leading delimiters, and fold consecutive delimiters in STR into a single '\0' in ARGZ. */ if ((q > argz) && (q[-1] != LT_EOS_CHAR)) *q++ = LT_EOS_CHAR; else --argz_len; } else *q++ = *p; } /* Copy terminating LT_EOS_CHAR. */ *q = *p; } /* If ARGZ_LEN has shrunk to nothing, release ARGZ's memory. */ if (!argz_len) LT_DLFREE (argz); /* Assign new values. */ *pargz = argz; *pargz_len = argz_len; return 0; } #endif /* !HAVE_ARGZ_CREATE_SEP */ #if ! HAVE_ARGZ_INSERT # define argz_insert rpl_argz_insert static error_t argz_insert LT_PARAMS((char **pargz, size_t *pargz_len, char *before, const char *entry)); error_t argz_insert (pargz, pargz_len, before, entry) char **pargz; size_t *pargz_len; char *before; const char *entry; { assert (pargz); assert (pargz_len); assert (entry && *entry); /* Either PARGZ/PARGZ_LEN is empty and BEFORE is NULL, or BEFORE points into an address within the ARGZ vector. */ assert ((!*pargz && !*pargz_len && !before) || ((*pargz <= before) && (before < (*pargz + *pargz_len)))); /* No BEFORE address indicates ENTRY should be inserted after the current last element. */ if (!before) return argz_append (pargz, pargz_len, entry, 1+ LT_STRLEN (entry)); /* This probably indicates a programmer error, but to preserve semantics, scan back to the start of an entry if BEFORE points into the middle of it. */ while ((before >= *pargz) && (before[-1] != LT_EOS_CHAR)) --before; { size_t entry_len = 1+ LT_STRLEN (entry); size_t argz_len = *pargz_len + entry_len; size_t offset = before - *pargz; char *argz = LT_DLREALLOC (char, *pargz, argz_len); if (!argz) return ENOMEM; /* Make BEFORE point to the equivalent offset in ARGZ that it used to have in *PARGZ incase realloc() moved the block. */ before = argz + offset; /* Move the ARGZ entries starting at BEFORE up into the new space at the end -- making room to copy ENTRY into the resulting gap. */ memmove (before + entry_len, before, *pargz_len - offset); memcpy (before, entry, entry_len); /* Assign new values. */ *pargz = argz; *pargz_len = argz_len; } return 0; } #endif /* !HAVE_ARGZ_INSERT */ #if ! HAVE_ARGZ_NEXT # define argz_next rpl_argz_next static char *argz_next LT_PARAMS((char *argz, size_t argz_len, const char *entry)); char * argz_next (argz, argz_len, entry) char *argz; size_t argz_len; const char *entry; { assert ((argz && argz_len) || (!argz && !argz_len)); if (entry) { /* Either ARGZ/ARGZ_LEN is empty, or ENTRY points into an address within the ARGZ vector. */ assert ((!argz && !argz_len) || ((argz <= entry) && (entry < (argz + argz_len)))); /* Move to the char immediately after the terminating '\0' of ENTRY. */ entry = 1+ strchr (entry, LT_EOS_CHAR); /* Return either the new ENTRY, or else NULL if ARGZ is exhausted. */ return (entry >= argz + argz_len) ? 0 : (char *) entry; } else { /* This should probably be flagged as a programmer error, since starting an argz_next loop with the iterator set to ARGZ is safer. To preserve semantics, handle the NULL case by returning the start of ARGZ (if any). */ if (argz_len > 0) return argz; else return 0; } } #endif /* !HAVE_ARGZ_NEXT */ #if ! HAVE_ARGZ_STRINGIFY # define argz_stringify rpl_argz_stringify static void argz_stringify LT_PARAMS((char *argz, size_t argz_len, int sep)); void argz_stringify (argz, argz_len, sep) char *argz; size_t argz_len; int sep; { assert ((argz && argz_len) || (!argz && !argz_len)); if (sep) { --argz_len; /* don't stringify the terminating EOS */ while (--argz_len > 0) { if (argz[argz_len] == LT_EOS_CHAR) argz[argz_len] = sep; } } } #endif /* !HAVE_ARGZ_STRINGIFY */  /* --- TYPE DEFINITIONS -- */ /* This type is used for the array of caller data sets in each handler. */ typedef struct { lt_dlcaller_id key; lt_ptr data; } lt_caller_data;  /* --- OPAQUE STRUCTURES DECLARED IN LTDL.H --- */ /* Extract the diagnostic strings from the error table macro in the same order as the enumerated indices in ltdl.h. */ static const char *lt_dlerror_strings[] = { #define LT_ERROR(name, diagnostic) (diagnostic), lt_dlerror_table #undef LT_ERROR 0 }; /* This structure is used for the list of registered loaders. */ struct lt_dlloader { struct lt_dlloader *next; const char *loader_name; /* identifying name for each loader */ const char *sym_prefix; /* prefix for symbols */ lt_module_open *module_open; lt_module_close *module_close; lt_find_sym *find_sym; lt_dlloader_exit *dlloader_exit; lt_user_data dlloader_data; }; struct lt_dlhandle_struct { struct lt_dlhandle_struct *next; lt_dlloader *loader; /* dlopening interface */ lt_dlinfo info; int depcount; /* number of dependencies */ lt_dlhandle *deplibs; /* dependencies */ lt_module module; /* system module handle */ lt_ptr system; /* system specific data */ lt_caller_data *caller_data; /* per caller associated data */ int flags; /* various boolean stats */ }; /* Various boolean flags can be stored in the flags field of an lt_dlhandle_struct... */ #define LT_DLGET_FLAG(handle, flag) (((handle)->flags & (flag)) == (flag)) #define LT_DLSET_FLAG(handle, flag) ((handle)->flags |= (flag)) #define LT_DLRESIDENT_FLAG (0x01 << 0) /* ...add more flags here... */ #define LT_DLIS_RESIDENT(handle) LT_DLGET_FLAG(handle, LT_DLRESIDENT_FLAG) #define LT_DLSTRERROR(name) lt_dlerror_strings[LT_CONC(LT_ERROR_,name)] static const char objdir[] = LTDL_OBJDIR; static const char archive_ext[] = LTDL_ARCHIVE_EXT; #ifdef LTDL_SHLIB_EXT static const char shlib_ext[] = LTDL_SHLIB_EXT; #endif #ifdef LTDL_SYSSEARCHPATH static const char sys_search_path[] = LTDL_SYSSEARCHPATH; #endif  /* --- MUTEX LOCKING --- */ /* Macros to make it easier to run the lock functions only if they have been registered. The reason for the complicated lock macro is to ensure that the stored error message from the last error is not accidentally erased if the current function doesn't generate an error of its own. */ #define LT_DLMUTEX_LOCK() LT_STMT_START { \ if (lt_dlmutex_lock_func) (*lt_dlmutex_lock_func)(); \ } LT_STMT_END #define LT_DLMUTEX_UNLOCK() LT_STMT_START { \ if (lt_dlmutex_unlock_func) (*lt_dlmutex_unlock_func)();\ } LT_STMT_END #define LT_DLMUTEX_SETERROR(errormsg) LT_STMT_START { \ if (lt_dlmutex_seterror_func) \ (*lt_dlmutex_seterror_func) (errormsg); \ else lt_dllast_error = (errormsg); } LT_STMT_END #define LT_DLMUTEX_GETERROR(errormsg) LT_STMT_START { \ if (lt_dlmutex_seterror_func) \ (errormsg) = (*lt_dlmutex_geterror_func) (); \ else (errormsg) = lt_dllast_error; } LT_STMT_END /* The mutex functions stored here are global, and are necessarily the same for all threads that wish to share access to libltdl. */ static lt_dlmutex_lock *lt_dlmutex_lock_func = 0; static lt_dlmutex_unlock *lt_dlmutex_unlock_func = 0; static lt_dlmutex_seterror *lt_dlmutex_seterror_func = 0; static lt_dlmutex_geterror *lt_dlmutex_geterror_func = 0; static const char *lt_dllast_error = 0; /* Either set or reset the mutex functions. Either all the arguments must be valid functions, or else all can be NULL to turn off locking entirely. The registered functions should be manipulating a static global lock from the lock() and unlock() callbacks, which needs to be reentrant. */ int lt_dlmutex_register (lock, unlock, seterror, geterror) lt_dlmutex_lock *lock; lt_dlmutex_unlock *unlock; lt_dlmutex_seterror *seterror; lt_dlmutex_geterror *geterror; { lt_dlmutex_unlock *old_unlock = unlock; int errors = 0; /* Lock using the old lock() callback, if any. */ LT_DLMUTEX_LOCK (); if ((lock && unlock && seterror && geterror) || !(lock || unlock || seterror || geterror)) { lt_dlmutex_lock_func = lock; lt_dlmutex_unlock_func = unlock; lt_dlmutex_geterror_func = geterror; } else { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_MUTEX_ARGS)); ++errors; } /* Use the old unlock() callback we saved earlier, if any. Otherwise record any errors using internal storage. */ if (old_unlock) (*old_unlock) (); /* Return the number of errors encountered during the execution of this function. */ return errors; }  /* --- ERROR HANDLING --- */ static const char **user_error_strings = 0; static int errorcount = LT_ERROR_MAX; int lt_dladderror (diagnostic) const char *diagnostic; { int errindex = 0; int result = -1; const char **temp = (const char **) 0; assert (diagnostic); LT_DLMUTEX_LOCK (); errindex = errorcount - LT_ERROR_MAX; temp = LT_EREALLOC (const char *, user_error_strings, 1 + errindex); if (temp) { user_error_strings = temp; user_error_strings[errindex] = diagnostic; result = errorcount++; } LT_DLMUTEX_UNLOCK (); return result; } int lt_dlseterror (errindex) int errindex; { int errors = 0; LT_DLMUTEX_LOCK (); if (errindex >= errorcount || errindex < 0) { /* Ack! Error setting the error message! */ LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_ERRORCODE)); ++errors; } else if (errindex < LT_ERROR_MAX) { /* No error setting the error message! */ LT_DLMUTEX_SETERROR (lt_dlerror_strings[errindex]); } else { /* No error setting the error message! */ LT_DLMUTEX_SETERROR (user_error_strings[errindex - LT_ERROR_MAX]); } LT_DLMUTEX_UNLOCK (); return errors; } lt_ptr lt_emalloc (size) size_t size; { lt_ptr mem = lt_dlmalloc (size); if (size && !mem) LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_MEMORY)); return mem; } lt_ptr lt_erealloc (addr, size) lt_ptr addr; size_t size; { lt_ptr mem = realloc (addr, size); if (size && !mem) LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_MEMORY)); return mem; } char * lt_estrdup (str) const char *str; { char *dup = strdup (str); if (LT_STRLEN (str) && !dup) LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_MEMORY)); return dup; }  /* --- DLOPEN() INTERFACE LOADER --- */ /* The Cygwin dlopen implementation prints a spurious error message to stderr if its call to LoadLibrary() fails for any reason. We can mitigate this by not using the Cygwin implementation, and falling back to our own LoadLibrary() wrapper. */ #if HAVE_LIBDL && !defined(__CYGWIN__) /* dynamic linking with dlopen/dlsym */ #if HAVE_DLFCN_H # include <dlfcn.h> #endif #if HAVE_SYS_DL_H # include <sys/dl.h> #endif #ifdef RTLD_GLOBAL # define LT_GLOBAL RTLD_GLOBAL #else # ifdef DL_GLOBAL # define LT_GLOBAL DL_GLOBAL # endif #endif /* !RTLD_GLOBAL */ #ifndef LT_GLOBAL # define LT_GLOBAL 0 #endif /* !LT_GLOBAL */ /* We may have to define LT_LAZY_OR_NOW in the command line if we find out it does not work in some platform. */ #ifndef LT_LAZY_OR_NOW # ifdef RTLD_LAZY # define LT_LAZY_OR_NOW RTLD_LAZY # else # ifdef DL_LAZY # define LT_LAZY_OR_NOW DL_LAZY # endif # endif /* !RTLD_LAZY */ #endif #ifndef LT_LAZY_OR_NOW # ifdef RTLD_NOW # define LT_LAZY_OR_NOW RTLD_NOW # else # ifdef DL_NOW # define LT_LAZY_OR_NOW DL_NOW # endif # endif /* !RTLD_NOW */ #endif #ifndef LT_LAZY_OR_NOW # define LT_LAZY_OR_NOW 0 #endif /* !LT_LAZY_OR_NOW */ #if HAVE_DLERROR # define DLERROR(arg) dlerror () #else # define DLERROR(arg) LT_DLSTRERROR (arg) #endif static lt_module sys_dl_open (loader_data, filename) lt_user_data loader_data; const char *filename; { lt_module module = dlopen (filename, LT_GLOBAL | LT_LAZY_OR_NOW); if (!module) { const char* tmp = dlerror(); const char* match = strstr (tmp, "undefined symbol:" ); if ( match ) { fprintf (stderr, "Failed to open shared lib: %s\n" " Error: %s\n", filename, tmp); } LT_DLMUTEX_SETERROR (DLERROR (CANNOT_OPEN)); } return module; } static int sys_dl_close (loader_data, module) lt_user_data loader_data; lt_module module; { int errors = 0; if (dlclose (module) != 0) { LT_DLMUTEX_SETERROR (DLERROR (CANNOT_CLOSE)); ++errors; } return errors; } static lt_ptr sys_dl_sym (loader_data, module, symbol) lt_user_data loader_data; lt_module module; const char *symbol; { lt_ptr address = dlsym (module, symbol); if (!address) { LT_DLMUTEX_SETERROR (DLERROR (SYMBOL_NOT_FOUND)); } return address; } static struct lt_user_dlloader sys_dl = { # ifdef NEED_USCORE "_", # else 0, # endif sys_dl_open, sys_dl_close, sys_dl_sym, 0, 0 }; #endif /* HAVE_LIBDL */  /* --- SHL_LOAD() INTERFACE LOADER --- */ #if HAVE_SHL_LOAD /* dynamic linking with shl_load (HP-UX) (comments from gmodule) */ #ifdef HAVE_DL_H # include <dl.h> #endif /* some flags are missing on some systems, so we provide * harmless defaults. * * Mandatory: * BIND_IMMEDIATE - Resolve symbol references when the library is loaded. * BIND_DEFERRED - Delay code symbol resolution until actual reference. * * Optionally: * BIND_FIRST - Place the library at the head of the symbol search * order. * BIND_NONFATAL - The default BIND_IMMEDIATE behavior is to treat all * unsatisfied symbols as fatal. This flag allows * binding of unsatisfied code symbols to be deferred * until use. * [Perl: For certain libraries, like DCE, deferred * binding often causes run time problems. Adding * BIND_NONFATAL to BIND_IMMEDIATE still allows * unresolved references in situations like this.] * BIND_NOSTART - Do not call the initializer for the shared library * when the library is loaded, nor on a future call to * shl_unload(). * BIND_VERBOSE - Print verbose messages concerning possible * unsatisfied symbols. * * hp9000s700/hp9000s800: * BIND_RESTRICTED - Restrict symbols visible by the library to those * present at library load time. * DYNAMIC_PATH - Allow the loader to dynamically search for the * library specified by the path argument. */ #ifndef DYNAMIC_PATH # define DYNAMIC_PATH 0 #endif #ifndef BIND_RESTRICTED # define BIND_RESTRICTED 0 #endif #define LT_BIND_FLAGS (BIND_IMMEDIATE | BIND_NONFATAL | DYNAMIC_PATH) static lt_module sys_shl_open (loader_data, filename) lt_user_data loader_data; const char *filename; { static shl_t self = (shl_t) 0; lt_module module = shl_load (filename, LT_BIND_FLAGS, 0L); /* Since searching for a symbol against a NULL module handle will also look in everything else that was already loaded and exported with the -E compiler flag, we always cache a handle saved before any modules are loaded. */ if (!self) { lt_ptr address; shl_findsym (&self, "main", TYPE_UNDEFINED, &address); } if (!filename) { module = self; } else { module = shl_load (filename, LT_BIND_FLAGS, 0L); if (!module) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_OPEN)); } } return module; } static int sys_shl_close (loader_data, module) lt_user_data loader_data; lt_module module; { int errors = 0; if (module && (shl_unload ((shl_t) (module)) != 0)) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_CLOSE)); ++errors; } return errors; } static lt_ptr sys_shl_sym (loader_data, module, symbol) lt_user_data loader_data; lt_module module; const char *symbol; { lt_ptr address = 0; /* sys_shl_open should never return a NULL module handle */ if (module == (lt_module) 0) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE)); } else if (!shl_findsym((shl_t*) &module, symbol, TYPE_UNDEFINED, &address)) { if (!address) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND)); } } return address; } static struct lt_user_dlloader sys_shl = { 0, sys_shl_open, sys_shl_close, sys_shl_sym, 0, 0 }; #endif /* HAVE_SHL_LOAD */  /* --- LOADLIBRARY() INTERFACE LOADER --- */ #ifdef __WINDOWS__ /* dynamic linking for Win32 */ #include <windows.h> /* Forward declaration; required to implement handle search below. */ static lt_dlhandle handles; static lt_module sys_wll_open (loader_data, filename) lt_user_data loader_data; const char *filename; { lt_dlhandle cur; lt_module module = 0; const char *errormsg = 0; char *searchname = 0; char *ext; char self_name_buf[MAX_PATH]; if (!filename) { /* Get the name of main module */ *self_name_buf = 0; GetModuleFileName (NULL, self_name_buf, sizeof (self_name_buf)); filename = ext = self_name_buf; } else { ext = strrchr (filename, '.'); } if (ext) { /* FILENAME already has an extension. */ searchname = lt_estrdup (filename); } else { /* Append a `.' to stop Windows from adding an implicit `.dll' extension. */ searchname = LT_EMALLOC (char, 2+ LT_STRLEN (filename)); if (searchname) sprintf (searchname, "%s.", filename); } if (!searchname) return 0; #if __CYGWIN__ { char wpath[MAX_PATH]; cygwin_conv_to_full_win32_path(searchname, wpath); module = LoadLibrary(wpath); } #else module = LoadLibrary (searchname); #endif LT_DLFREE (searchname); /* libltdl expects this function to fail if it is unable to physically load the library. Sadly, LoadLibrary will search the loaded libraries for a match and return one of them if the path search load fails. We check whether LoadLibrary is returning a handle to an already loaded module, and simulate failure if we find one. */ LT_DLMUTEX_LOCK (); cur = handles; while (cur) { if (!cur->module) { cur = 0; break; } if (cur->module == module) { break; } cur = cur->next; } LT_DLMUTEX_UNLOCK (); if (cur || !module) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_OPEN)); module = 0; } return module; } static int sys_wll_close (loader_data, module) lt_user_data loader_data; lt_module module; { int errors = 0; if (FreeLibrary(module) == 0) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_CLOSE)); ++errors; } return errors; } static lt_ptr sys_wll_sym (loader_data, module, symbol) lt_user_data loader_data; lt_module module; const char *symbol; { lt_ptr address = GetProcAddress (module, symbol); if (!address) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND)); } return address; } static struct lt_user_dlloader sys_wll = { 0, sys_wll_open, sys_wll_close, sys_wll_sym, 0, 0 }; #endif /* __WINDOWS__ */  /* --- LOAD_ADD_ON() INTERFACE LOADER --- */ #ifdef __BEOS__ /* dynamic linking for BeOS */ #include <kernel/image.h> static lt_module sys_bedl_open (loader_data, filename) lt_user_data loader_data; const char *filename; { image_id image = 0; if (filename) { image = load_add_on (filename); } else { image_info info; int32 cookie = 0; if (get_next_image_info (0, &cookie, &info) == B_OK) image = load_add_on (info.name); } if (image <= 0) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_OPEN)); image = 0; } return (lt_module) image; } static int sys_bedl_close (loader_data, module) lt_user_data loader_data; lt_module module; { int errors = 0; if (unload_add_on ((image_id) module) != B_OK) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_CLOSE)); ++errors; } return errors; } static lt_ptr sys_bedl_sym (loader_data, module, symbol) lt_user_data loader_data; lt_module module; const char *symbol; { lt_ptr address = 0; image_id image = (image_id) module; if (get_image_symbol (image, symbol, B_SYMBOL_TYPE_ANY, address) != B_OK) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND)); address = 0; } return address; } static struct lt_user_dlloader sys_bedl = { 0, sys_bedl_open, sys_bedl_close, sys_bedl_sym, 0, 0 }; #endif /* __BEOS__ */  /* --- DLD_LINK() INTERFACE LOADER --- */ #if HAVE_DLD /* dynamic linking with dld */ #if HAVE_DLD_H #include <dld.h> #endif static lt_module sys_dld_open (loader_data, filename) lt_user_data loader_data; const char *filename; { lt_module module = strdup (filename); if (dld_link (filename) != 0) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_OPEN)); LT_DLFREE (module); module = 0; } return module; } static int sys_dld_close (loader_data, module) lt_user_data loader_data; lt_module module; { int errors = 0; if (dld_unlink_by_file ((char*)(module), 1) != 0) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_CLOSE)); ++errors; } else { LT_DLFREE (module); } return errors; } static lt_ptr sys_dld_sym (loader_data, module, symbol) lt_user_data loader_data; lt_module module; const char *symbol; { lt_ptr address = dld_get_func (symbol); if (!address) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND)); } return address; } static struct lt_user_dlloader sys_dld = { 0, sys_dld_open, sys_dld_close, sys_dld_sym, 0, 0 }; #endif /* HAVE_DLD */  /* --- DLPREOPEN() INTERFACE LOADER --- */ /* emulate dynamic linking using preloaded_symbols */ typedef struct lt_dlsymlists_t { struct lt_dlsymlists_t *next; const lt_dlsymlist *syms; } lt_dlsymlists_t; static const lt_dlsymlist *default_preloaded_symbols = 0; static lt_dlsymlists_t *preloaded_symbols = 0; static int presym_init (loader_data) lt_user_data loader_data; { int errors = 0; LT_DLMUTEX_LOCK (); preloaded_symbols = 0; if (default_preloaded_symbols) { errors = lt_dlpreload (default_preloaded_symbols); } LT_DLMUTEX_UNLOCK (); return errors; } static int presym_free_symlists () { lt_dlsymlists_t *lists; LT_DLMUTEX_LOCK (); lists = preloaded_symbols; while (lists) { lt_dlsymlists_t *tmp = lists; lists = lists->next; LT_DLFREE (tmp); } preloaded_symbols = 0; LT_DLMUTEX_UNLOCK (); return 0; } static int presym_exit (loader_data) lt_user_data loader_data; { presym_free_symlists (); return 0; } static int presym_add_symlist (preloaded) const lt_dlsymlist *preloaded; { lt_dlsymlists_t *tmp; lt_dlsymlists_t *lists; int errors = 0; LT_DLMUTEX_LOCK (); lists = preloaded_symbols; while (lists) { if (lists->syms == preloaded) { goto done; } lists = lists->next; } tmp = LT_EMALLOC (lt_dlsymlists_t, 1); if (tmp) { memset (tmp, 0, sizeof(lt_dlsymlists_t)); tmp->syms = preloaded; tmp->next = preloaded_symbols; preloaded_symbols = tmp; } else { ++errors; } done: LT_DLMUTEX_UNLOCK (); return errors; } static lt_module presym_open (loader_data, filename) lt_user_data loader_data; const char *filename; { lt_dlsymlists_t *lists; lt_module module = (lt_module) 0; LT_DLMUTEX_LOCK (); lists = preloaded_symbols; if (!lists) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_SYMBOLS)); goto done; } /* Can't use NULL as the reflective symbol header, as NULL is used to mark the end of the entire symbol list. Self-dlpreopened symbols follow this magic number, chosen to be an unlikely clash with a real module name. */ if (!filename) { filename = "@PROGRAM@"; } while (lists) { const lt_dlsymlist *syms = lists->syms; while (syms->name) { if (!syms->address && strcmp(syms->name, filename) == 0) { module = (lt_module) syms; goto done; } ++syms; } lists = lists->next; } LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND)); done: LT_DLMUTEX_UNLOCK (); return module; } static int presym_close (loader_data, module) lt_user_data loader_data; lt_module module; { /* Just to silence gcc -Wall */ module = 0; return 0; } static lt_ptr presym_sym (loader_data, module, symbol) lt_user_data loader_data; lt_module module; const char *symbol; { lt_dlsymlist *syms = (lt_dlsymlist*) module; ++syms; while (syms->address) { if (strcmp(syms->name, symbol) == 0) { return syms->address; } ++syms; } LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND)); return 0; } static struct lt_user_dlloader presym = { 0, presym_open, presym_close, presym_sym, presym_exit, 0 };  /* --- DYNAMIC MODULE LOADING --- */ /* The type of a function used at each iteration of foreach_dirinpath(). */ typedef int foreach_callback_func LT_PARAMS((char *filename, lt_ptr data1, lt_ptr data2)); static int foreach_dirinpath LT_PARAMS((const char *search_path, const char *base_name, foreach_callback_func *func, lt_ptr data1, lt_ptr data2)); static int find_file_callback LT_PARAMS((char *filename, lt_ptr data, lt_ptr ignored)); static int find_handle_callback LT_PARAMS((char *filename, lt_ptr data, lt_ptr ignored)); static int foreachfile_callback LT_PARAMS((char *filename, lt_ptr data1, lt_ptr data2)); static int canonicalize_path LT_PARAMS((const char *path, char **pcanonical)); static int argzize_path LT_PARAMS((const char *path, char **pargz, size_t *pargz_len)); static FILE *find_file LT_PARAMS((const char *search_path, const char *base_name, char **pdir)); static lt_dlhandle *find_handle LT_PARAMS((const char *search_path, const char *base_name, lt_dlhandle *handle)); static int find_module LT_PARAMS((lt_dlhandle *handle, const char *dir, const char *libdir, const char *dlname, const char *old_name, int installed)); static int free_vars LT_PARAMS((char *dlname, char *oldname, char *libdir, char *deplibs)); static int load_deplibs LT_PARAMS((lt_dlhandle handle, char *deplibs)); static int trim LT_PARAMS((char **dest, const char *str)); static int try_dlopen LT_PARAMS((lt_dlhandle *handle, const char *filename)); static int tryall_dlopen LT_PARAMS((lt_dlhandle *handle, const char *filename)); static int unload_deplibs LT_PARAMS((lt_dlhandle handle)); static int lt_argz_insert LT_PARAMS((char **pargz, size_t *pargz_len, char *before, const char *entry)); static int lt_argz_insertinorder LT_PARAMS((char **pargz, size_t *pargz_len, const char *entry)); static int lt_dlpath_insertdir LT_PARAMS((char **ppath, char *before, const char *dir)); static char *user_search_path= 0; static lt_dlloader *loaders = 0; static lt_dlhandle handles = 0; static int initialized = 0; /* Initialize libltdl. */ int lt_dlinit () { int errors = 0; LT_DLMUTEX_LOCK (); /* Initialize only at first call. */ if (++initialized == 1) { handles = 0; user_search_path = 0; /* empty search path */ #if HAVE_LIBDL && !defined(__CYGWIN__) errors += lt_dlloader_add (lt_dlloader_next (0), &sys_dl, "dlopen"); #endif #if HAVE_SHL_LOAD errors += lt_dlloader_add (lt_dlloader_next (0), &sys_shl, "dlopen"); #endif #ifdef __WINDOWS__ errors += lt_dlloader_add (lt_dlloader_next (0), &sys_wll, "dlopen"); #endif #ifdef __BEOS__ errors += lt_dlloader_add (lt_dlloader_next (0), &sys_bedl, "dlopen"); #endif #if HAVE_DLD errors += lt_dlloader_add (lt_dlloader_next (0), &sys_dld, "dld"); #endif errors += lt_dlloader_add (lt_dlloader_next (0), &presym, "dlpreload"); if (presym_init (presym.dlloader_data)) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INIT_LOADER)); ++errors; } else if (errors != 0) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (DLOPEN_NOT_SUPPORTED)); ++errors; } } LT_DLMUTEX_UNLOCK (); return errors; } int lt_dlpreload (preloaded) const lt_dlsymlist *preloaded; { int errors = 0; if (preloaded) { errors = presym_add_symlist (preloaded); } else { presym_free_symlists(); LT_DLMUTEX_LOCK (); if (default_preloaded_symbols) { errors = lt_dlpreload (default_preloaded_symbols); } LT_DLMUTEX_UNLOCK (); } return errors; } int lt_dlpreload_default (preloaded) const lt_dlsymlist *preloaded; { LT_DLMUTEX_LOCK (); default_preloaded_symbols = preloaded; LT_DLMUTEX_UNLOCK (); return 0; } int lt_dlexit () { /* shut down libltdl */ lt_dlloader *loader; int errors = 0; LT_DLMUTEX_LOCK (); loader = loaders; if (!initialized) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SHUTDOWN)); ++errors; goto done; } /* shut down only at last call. */ if (--initialized == 0) { int level; while (handles && LT_DLIS_RESIDENT (handles)) { handles = handles->next; } /* close all modules */ for (level = 1; handles; ++level) { lt_dlhandle cur = handles; int saw_nonresident = 0; while (cur) { lt_dlhandle tmp = cur; cur = cur->next; if (!LT_DLIS_RESIDENT (tmp)) saw_nonresident = 1; if (!LT_DLIS_RESIDENT (tmp) && tmp->info.ref_count <= level) { if (lt_dlclose (tmp)) { ++errors; } } } /* done if only resident modules are left */ if (!saw_nonresident) break; } /* close all loaders */ while (loader) { lt_dlloader *next = loader->next; lt_user_data data = loader->dlloader_data; if (loader->dlloader_exit && loader->dlloader_exit (data)) { ++errors; } LT_DLMEM_REASSIGN (loader, next); } loaders = 0; } done: LT_DLMUTEX_UNLOCK (); return errors; } static int tryall_dlopen (handle, filename) lt_dlhandle *handle; const char *filename; { lt_dlhandle cur; lt_dlloader *loader; const char *saved_error; int errors = 0; LT_DLMUTEX_GETERROR (saved_error); LT_DLMUTEX_LOCK (); cur = handles; loader = loaders; /* check whether the module was already opened */ while (cur) { /* try to dlopen the program itself? */ if (!cur->info.filename && !filename) { break; } if (cur->info.filename && filename && strcmp (cur->info.filename, filename) == 0) { break; } cur = cur->next; } if (cur) { ++cur->info.ref_count; *handle = cur; goto done; } cur = *handle; if (filename) { cur->info.filename = lt_estrdup (filename); if (!cur->info.filename) { ++errors; goto done; } } else { cur->info.filename = 0; } while (loader) { lt_user_data data = loader->dlloader_data; cur->module = loader->module_open (data, filename); if (cur->module != 0) { break; } loader = loader->next; } if (!loader) { LT_DLFREE (cur->info.filename); ++errors; goto done; } cur->loader = loader; LT_DLMUTEX_SETERROR (saved_error); done: LT_DLMUTEX_UNLOCK (); return errors; } static int tryall_dlopen_module (handle, prefix, dirname, dlname) lt_dlhandle *handle; const char *prefix; const char *dirname; const char *dlname; { int error = 0; char *filename = 0; size_t filename_len = 0; size_t dirname_len = LT_STRLEN (dirname); assert (handle); assert (dirname); assert (dlname); #ifdef LT_DIRSEP_CHAR /* Only canonicalized names (i.e. with DIRSEP chars already converted) should make it into this function: */ assert (strchr (dirname, LT_DIRSEP_CHAR) == 0); #endif if (dirname[dirname_len -1] == '/') --dirname_len; filename_len = dirname_len + 1 + LT_STRLEN (dlname); /* Allocate memory, and combine DIRNAME and MODULENAME into it. The PREFIX (if any) is handled below. */ filename = LT_EMALLOC (char, dirname_len + 1 + filename_len + 1); if (!filename) return 1; sprintf (filename, "%.*s/%s", (int) dirname_len, dirname, dlname); /* Now that we have combined DIRNAME and MODULENAME, if there is also a PREFIX to contend with, simply recurse with the arguments shuffled. Otherwise, attempt to open FILENAME as a module. */ if (prefix) { error += tryall_dlopen_module (handle, (const char *) 0, prefix, filename); } else if (tryall_dlopen (handle, filename) != 0) { ++error; } LT_DLFREE (filename); return error; } static int find_module (handle, dir, libdir, dlname, old_name, installed) lt_dlhandle *handle; const char *dir; const char *libdir; const char *dlname; const char *old_name; int installed; { /* Try to open the old library first; if it was dlpreopened, we want the preopened version of it, even if a dlopenable module is available. */ if (old_name && tryall_dlopen (handle, old_name) == 0) { return 0; } /* Try to open the dynamic library. */ if (dlname) { /* try to open the installed module */ if (installed && libdir) { if (tryall_dlopen_module (handle, (const char *) 0, libdir, dlname) == 0) return 0; } /* try to open the not-installed module */ if (!installed) { if (tryall_dlopen_module (handle, dir, objdir, dlname) == 0) return 0; } /* maybe it was moved to another directory */ { if (tryall_dlopen_module (handle, (const char *) 0, dir, dlname) == 0) return 0; } } return 1; } static int canonicalize_path (path, pcanonical) const char *path; char **pcanonical; { char *canonical = 0; assert (path && *path); assert (pcanonical); canonical = LT_EMALLOC (char, 1+ LT_STRLEN (path)); if (!canonical) return 1; { size_t dest = 0; size_t src; for (src = 0; path[src] != LT_EOS_CHAR; ++src) { /* Path separators are not copied to the beginning or end of the destination, or if another separator would follow immediately. */ if (path[src] == LT_PATHSEP_CHAR) { if ((dest == 0) || (path[1+ src] == LT_PATHSEP_CHAR) || (path[1+ src] == LT_EOS_CHAR)) continue; } /* Anything other than a directory separator is copied verbatim. */ if ((path[src] != '/') #ifdef LT_DIRSEP_CHAR && (path[src] != LT_DIRSEP_CHAR) #endif ) { canonical[dest++] = path[src]; } /* Directory separators are converted and copied only if they are not at the end of a path -- i.e. before a path separator or NULL terminator. */ else if ((path[1+ src] != LT_PATHSEP_CHAR) && (path[1+ src] != LT_EOS_CHAR) #ifdef LT_DIRSEP_CHAR && (path[1+ src] != LT_DIRSEP_CHAR) #endif && (path[1+ src] != '/')) { canonical[dest++] = '/'; } } /* Add an end-of-string marker at the end. */ canonical[dest] = LT_EOS_CHAR; } /* Assign new value. */ *pcanonical = canonical; return 0; } static int argzize_path (path, pargz, pargz_len) const char *path; char **pargz; size_t *pargz_len; { error_t error; assert (path); assert (pargz); assert (pargz_len); if ((error = argz_create_sep (path, LT_PATHSEP_CHAR, pargz, pargz_len))) { switch (error) { case ENOMEM: LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_MEMORY)); break; default: LT_DLMUTEX_SETERROR (LT_DLSTRERROR (UNKNOWN)); break; } return 1; } return 0; } /* Repeatedly call FUNC with each LT_PATHSEP_CHAR delimited element of SEARCH_PATH and references to DATA1 and DATA2, until FUNC returns non-zero or all elements are exhausted. If BASE_NAME is non-NULL, it is appended to each SEARCH_PATH element before FUNC is called. */ static int foreach_dirinpath (search_path, base_name, func, data1, data2) const char *search_path; const char *base_name; foreach_callback_func *func; lt_ptr data1; lt_ptr data2; { int result = 0; int filenamesize = 0; int lenbase = LT_STRLEN (base_name); size_t argz_len = 0; char * argz = 0; char * filename = 0; char * canonical = 0; LT_DLMUTEX_LOCK (); if (!search_path || !*search_path) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND)); goto cleanup; } if (canonicalize_path (search_path, &canonical) != 0) goto cleanup; if (argzize_path (canonical, &argz, &argz_len) != 0) goto cleanup; { char *dir_name = 0; while ((dir_name = argz_next (argz, argz_len, dir_name))) { int lendir = LT_STRLEN (dir_name); if (lendir +1 +lenbase >= filenamesize) { LT_DLFREE (filename); filenamesize = lendir +1 +lenbase +1; /* "/d" + '/' + "f" + '\0' */ filename = LT_EMALLOC (char, filenamesize); if (!filename) goto cleanup; } strncpy (filename, dir_name, lendir); if (base_name && *base_name) { if (filename[lendir -1] != '/') filename[lendir++] = '/'; strcpy (filename +lendir, base_name); } if ((result = (*func) (filename, data1, data2))) { break; } } } cleanup: LT_DLFREE (argz); LT_DLFREE (canonical); LT_DLFREE (filename); LT_DLMUTEX_UNLOCK (); return result; } /* If FILEPATH can be opened, store the name of the directory component in DATA1, and the opened FILE* structure address in DATA2. Otherwise DATA1 is unchanged, but DATA2 is set to a pointer to NULL. */ static int find_file_callback (filename, data1, data2) char *filename; lt_ptr data1; lt_ptr data2; { char **pdir = (char **) data1; FILE **pfile = (FILE **) data2; int is_done = 0; assert (filename && *filename); assert (pdir); assert (pfile); if ((*pfile = fopen (filename, LT_READTEXT_MODE))) { char *dirend = strrchr (filename, '/'); if (dirend > filename) *dirend = LT_EOS_CHAR; LT_DLFREE (*pdir); *pdir = lt_estrdup (filename); is_done = (*pdir == 0) ? -1 : 1; } return is_done; } static FILE * find_file (search_path, base_name, pdir) const char *search_path; const char *base_name; char **pdir; { FILE *file = 0; foreach_dirinpath (search_path, base_name, find_file_callback, pdir, &file); return file; } static int find_handle_callback (filename, data, ignored) char *filename; lt_ptr data; lt_ptr ignored; { lt_dlhandle *handle = (lt_dlhandle *) data; int found = access (filename, R_OK); /* Bail out if file cannot be read... */ if (!found) return 0; /* Try to dlopen the file, but do not continue searching in any case. */ if (tryall_dlopen (handle, filename) != 0) *handle = 0; return 1; } /* If HANDLE was found return it, otherwise return 0. If HANDLE was found but could not be opened, *HANDLE will be set to 0. */ static lt_dlhandle * find_handle (search_path, base_name, handle) const char *search_path; const char *base_name; lt_dlhandle *handle; { if (!search_path) return 0; if (!foreach_dirinpath (search_path, base_name, find_handle_callback, handle, 0)) return 0; return handle; } static int load_deplibs (handle, deplibs) lt_dlhandle handle; char *deplibs; { #if LTDL_DLOPEN_DEPLIBS char *p, *save_search_path = 0; int depcount = 0; int i; char **names = 0; #endif int errors = 0; handle->depcount = 0; #if LTDL_DLOPEN_DEPLIBS if (!deplibs) { return errors; } ++errors; LT_DLMUTEX_LOCK (); if (user_search_path) { save_search_path = lt_estrdup (user_search_path); if (!save_search_path) goto cleanup; } /* extract search paths and count deplibs */ p = deplibs; while (*p) { if (!isspace ((int) *p)) { char *end = p+1; while (*end && !isspace((int) *end)) { ++end; } if (strncmp(p, "-L", 2) == 0 || strncmp(p, "-R", 2) == 0) { char save = *end; *end = 0; /* set a temporary string terminator */ if (lt_dladdsearchdir(p+2)) { goto cleanup; } *end = save; } else { ++depcount; } p = end; } else { ++p; } } /* restore the old search path */ LT_DLFREE (user_search_path); user_search_path = save_search_path; LT_DLMUTEX_UNLOCK (); if (!depcount) { errors = 0; goto cleanup; } names = LT_EMALLOC (char *, depcount * sizeof (char*)); if (!names) goto cleanup; /* now only extract the actual deplibs */ depcount = 0; p = deplibs; while (*p) { if (isspace ((int) *p)) { ++p; } else { char *end = p+1; while (*end && !isspace ((int) *end)) { ++end; } if (strncmp(p, "-L", 2) != 0 && strncmp(p, "-R", 2) != 0) { char *name; char save = *end; *end = 0; /* set a temporary string terminator */ if (strncmp(p, "-l", 2) == 0) { size_t name_len = 3+ /* "lib" */ LT_STRLEN (p + 2); name = LT_EMALLOC (char, 1+ name_len); if (name) sprintf (name, "lib%s", p+2); } else name = lt_estrdup(p); if (!name) goto cleanup_names; names[depcount++] = name; *end = save; } p = end; } } /* load the deplibs (in reverse order) At this stage, don't worry if the deplibs do not load correctly, they may already be statically linked into the loading application for instance. There will be a more enlightening error message later on if the loaded module cannot resolve all of its symbols. */ if (depcount) { int j = 0; handle->deplibs = (lt_dlhandle*) LT_EMALLOC (lt_dlhandle *, depcount); if (!handle->deplibs) goto cleanup; for (i = 0; i < depcount; ++i) { handle->deplibs[j] = lt_dlopenext(names[depcount-1-i]); if (handle->deplibs[j]) { ++j; } } handle->depcount = j; /* Number of successfully loaded deplibs */ errors = 0; } cleanup_names: for (i = 0; i < depcount; ++i) { LT_DLFREE (names[i]); } cleanup: LT_DLFREE (names); #endif return errors; } static int unload_deplibs (handle) lt_dlhandle handle; { int i; int errors = 0; if (handle->depcount) { for (i = 0; i < handle->depcount; ++i) { if (!LT_DLIS_RESIDENT (handle->deplibs[i])) { errors += lt_dlclose (handle->deplibs[i]); } } } return errors; } static int trim (dest, str) char **dest; const char *str; { /* remove the leading and trailing "'" from str and store the result in dest */ const char *end = strrchr (str, '\''); int len = LT_STRLEN (str); char *tmp; LT_DLFREE (*dest); if (len > 3 && str[0] == '\'') { tmp = LT_EMALLOC (char, end - str); if (!tmp) return 1; strncpy(tmp, &str[1], (end - str) - 1); tmp[len-3] = LT_EOS_CHAR; *dest = tmp; } else { *dest = 0; } return 0; } static int free_vars (dlname, oldname, libdir, deplibs) char *dlname; char *oldname; char *libdir; char *deplibs; { LT_DLFREE (dlname); LT_DLFREE (oldname); LT_DLFREE (libdir); LT_DLFREE (deplibs); return 0; } int try_dlopen (phandle, filename) lt_dlhandle *phandle; const char *filename; { const char * ext = 0; const char * saved_error = 0; char * canonical = 0; char * base_name = 0; char * dir = 0; char * name = 0; int errors = 0; lt_dlhandle newhandle; assert (phandle); assert (*phandle == 0); LT_DLMUTEX_GETERROR (saved_error); /* dlopen self? */ if (!filename) { *phandle = (lt_dlhandle) LT_EMALLOC (struct lt_dlhandle_struct, 1); if (*phandle == 0) return 1; memset (*phandle, 0, sizeof(struct lt_dlhandle_struct)); newhandle = *phandle; /* lt_dlclose()ing yourself is very bad! Disallow it. */ LT_DLSET_FLAG (*phandle, LT_DLRESIDENT_FLAG); if (tryall_dlopen (&newhandle, 0) != 0) { LT_DLFREE (*phandle); return 1; } goto register_handle; } assert (filename && *filename); /* Doing this immediately allows internal functions to safely assume only canonicalized paths are passed. */ if (canonicalize_path (filename, &canonical) != 0) { ++errors; goto cleanup; } /* If the canonical module name is a path (relative or absolute) then split it into a directory part and a name part. */ base_name = strrchr (canonical, '/'); if (base_name) { size_t dirlen = (1+ base_name) - canonical; dir = LT_EMALLOC (char, 1+ dirlen); if (!dir) { ++errors; goto cleanup; } strncpy (dir, canonical, dirlen); dir[dirlen] = LT_EOS_CHAR; ++base_name; } else LT_DLMEM_REASSIGN (base_name, canonical); assert (base_name && *base_name); /* Check whether we are opening a libtool module (.la extension). */ ext = strrchr (base_name, '.'); if (ext && strcmp (ext, archive_ext) == 0) { /* this seems to be a libtool module */ FILE * file = 0; char * dlname = 0; char * old_name = 0; char * libdir = 0; char * deplibs = 0; char * line = 0; size_t line_len; int i; /* if we can't find the installed flag, it is probably an installed libtool archive, produced with an old version of libtool */ int installed = 1; /* extract the module name from the file name */ name = LT_EMALLOC (char, ext - base_name + 1); if (!name) { ++errors; goto cleanup; } /* canonicalize the module name */ for (i = 0; i < ext - base_name; ++i) { if (isalnum ((int)(base_name[i]))) { name[i] = base_name[i]; } else { name[i] = '_'; } } name[ext - base_name] = LT_EOS_CHAR; /* Now try to open the .la file. If there is no directory name component, try to find it first in user_search_path and then other prescribed paths. Otherwise (or in any case if the module was not yet found) try opening just the module name as passed. */ if (!dir) { const char *search_path; LT_DLMUTEX_LOCK (); search_path = user_search_path; if (search_path) file = find_file (user_search_path, base_name, &dir); LT_DLMUTEX_UNLOCK (); if (!file) { search_path = getenv (LTDL_SEARCHPATH_VAR); if (search_path) file = find_file (search_path, base_name, &dir); } #ifdef LTDL_SHLIBPATH_VAR if (!file) { search_path = getenv (LTDL_SHLIBPATH_VAR); if (search_path) file = find_file (search_path, base_name, &dir); } #endif #ifdef LTDL_SYSSEARCHPATH if (!file && sys_search_path) { file = find_file (sys_search_path, base_name, &dir); } #endif } if (!file) { file = fopen (filename, LT_READTEXT_MODE); } /* If we didn't find the file by now, it really isn't there. Set the status flag, and bail out. */ if (!file) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND)); ++errors; goto cleanup; } line_len = LT_FILENAME_MAX; line = LT_EMALLOC (char, line_len); if (!line) { fclose (file); ++errors; goto cleanup; } /* read the .la file */ while (!feof (file)) { if (!fgets (line, line_len, file)) { break; } /* Handle the case where we occasionally need to read a line that is longer than the initial buffer size. */ while (line[LT_STRLEN(line) -1] != '\n') { line = LT_DLREALLOC (char, line, line_len *2); if (!fgets (&line[line_len -1], line_len +1, file)) { break; } line_len *= 2; } if (line[0] == '\n' || line[0] == '#') { continue; } #undef STR_DLNAME #define STR_DLNAME "dlname=" if (strncmp (line, STR_DLNAME, sizeof (STR_DLNAME) - 1) == 0) { errors += trim (&dlname, &line[sizeof (STR_DLNAME) - 1]); } #undef STR_OLD_LIBRARY #define STR_OLD_LIBRARY "old_library=" else if (strncmp (line, STR_OLD_LIBRARY, sizeof (STR_OLD_LIBRARY) - 1) == 0) { errors += trim (&old_name, &line[sizeof (STR_OLD_LIBRARY) - 1]); } #undef STR_LIBDIR #define STR_LIBDIR "libdir=" else if (strncmp (line, STR_LIBDIR, sizeof (STR_LIBDIR) - 1) == 0) { errors += trim (&libdir, &line[sizeof(STR_LIBDIR) - 1]); } #undef STR_DL_DEPLIBS #define STR_DL_DEPLIBS "dependency_libs=" else if (strncmp (line, STR_DL_DEPLIBS, sizeof (STR_DL_DEPLIBS) - 1) == 0) { errors += trim (&deplibs, &line[sizeof (STR_DL_DEPLIBS) - 1]); } else if (strcmp (line, "installed=yes\n") == 0) { installed = 1; } else if (strcmp (line, "installed=no\n") == 0) { installed = 0; } #undef STR_LIBRARY_NAMES #define STR_LIBRARY_NAMES "library_names=" else if (! dlname && strncmp (line, STR_LIBRARY_NAMES, sizeof (STR_LIBRARY_NAMES) - 1) == 0) { char *last_libname; errors += trim (&dlname, &line[sizeof (STR_LIBRARY_NAMES) - 1]); if (!errors && dlname && (last_libname = strrchr (dlname, ' ')) != 0) { last_libname = lt_estrdup (last_libname + 1); if (!last_libname) { ++errors; goto cleanup; } LT_DLMEM_REASSIGN (dlname, last_libname); } } if (errors) break; } fclose (file); LT_DLFREE (line); /* allocate the handle */ *phandle = (lt_dlhandle) LT_EMALLOC (struct lt_dlhandle_struct, 1); if (*phandle == 0) ++errors; if (errors) { free_vars (dlname, old_name, libdir, deplibs); LT_DLFREE (*phandle); goto cleanup; } assert (*phandle); memset (*phandle, 0, sizeof(struct lt_dlhandle_struct)); if (load_deplibs (*phandle, deplibs) == 0) { newhandle = *phandle; /* find_module may replace newhandle */ if (find_module (&newhandle, dir, libdir, dlname, old_name, installed)) { unload_deplibs (*phandle); ++errors; } } else { ++errors; } free_vars (dlname, old_name, libdir, deplibs); if (errors) { LT_DLFREE (*phandle); goto cleanup; } if (*phandle != newhandle) { unload_deplibs (*phandle); } } else { /* not a libtool module */ *phandle = (lt_dlhandle) LT_EMALLOC (struct lt_dlhandle_struct, 1); if (*phandle == 0) { ++errors; goto cleanup; } memset (*phandle, 0, sizeof (struct lt_dlhandle_struct)); newhandle = *phandle; /* If the module has no directory name component, try to find it first in user_search_path and then other prescribed paths. Otherwise (or in any case if the module was not yet found) try opening just the module name as passed. */ if ((dir || (!find_handle (user_search_path, base_name, &newhandle) && !find_handle (getenv (LTDL_SEARCHPATH_VAR), base_name, &newhandle) #ifdef LTDL_SHLIBPATH_VAR && !find_handle (getenv (LTDL_SHLIBPATH_VAR), base_name, &newhandle) #endif #ifdef LTDL_SYSSEARCHPATH && !find_handle (sys_search_path, base_name, &newhandle) #endif ))) { if (0 != tryall_dlopen (&newhandle, filename)) newhandle = 0; } if (!newhandle) { LT_DLFREE (*phandle); ++errors; goto cleanup; } } register_handle: LT_DLMEM_REASSIGN (*phandle, newhandle); if ((*phandle)->info.ref_count == 0) { (*phandle)->info.ref_count = 1; LT_DLMEM_REASSIGN ((*phandle)->info.name, name); LT_DLMUTEX_LOCK (); (*phandle)->next = handles; handles = *phandle; LT_DLMUTEX_UNLOCK (); } LT_DLMUTEX_SETERROR (saved_error); cleanup: LT_DLFREE (dir); LT_DLFREE (name); LT_DLFREE (canonical); return errors; } lt_dlhandle lt_dlopen (filename) const char *filename; { lt_dlhandle handle = 0; /* Just incase we missed a code path in try_dlopen() that reports an error, but forgets to reset handle... */ if (try_dlopen (&handle, filename) != 0) return 0; return handle; } /* If the last error messge store was `FILE_NOT_FOUND', then return non-zero. */ int file_not_found () { const char *error = 0; LT_DLMUTEX_GETERROR (error); if (error == LT_DLSTRERROR (FILE_NOT_FOUND)) return 1; return 0; } /* If FILENAME has an ARCHIVE_EXT or SHLIB_EXT extension, try to open the FILENAME as passed. Otherwise try appending ARCHIVE_EXT, and if a file is still not found try again with SHLIB_EXT appended instead. */ lt_dlhandle lt_dlopenext (filename) const char *filename; { lt_dlhandle handle = 0; char * tmp = 0; char * ext = 0; int len; int errors = 0; int file_found = 1; /* until proven otherwise */ if (!filename) { return lt_dlopen (filename); } assert (filename); len = LT_STRLEN (filename); ext = strrchr (filename, '.'); /* If FILENAME already bears a suitable extension, there is no need to try appending additional extensions. */ if (ext && ((strcmp (ext, archive_ext) == 0) #ifdef LTDL_SHLIB_EXT || (strcmp (ext, shlib_ext) == 0) #endif )) { return lt_dlopen (filename); } /* First try appending ARCHIVE_EXT. */ tmp = LT_EMALLOC (char, len + LT_STRLEN (archive_ext) + 1); if (!tmp) return 0; strcpy (tmp, filename); strcat (tmp, archive_ext); errors = try_dlopen (&handle, tmp); /* If we found FILENAME, stop searching -- whether we were able to load the file as a module or not. If the file exists but loading failed, it is better to return an error message here than to report FILE_NOT_FOUND when the alternatives (foo.so etc) are not in the module search path. */ if (handle || ((errors > 0) && file_not_found ())) { LT_DLFREE (tmp); return handle; } #ifdef LTDL_SHLIB_EXT /* Try appending SHLIB_EXT. */ if (LT_STRLEN (shlib_ext) > LT_STRLEN (archive_ext)) { LT_DLFREE (tmp); tmp = LT_EMALLOC (char, len + LT_STRLEN (shlib_ext) + 1); if (!tmp) return 0; strcpy (tmp, filename); } else { tmp[len] = LT_EOS_CHAR; } strcat(tmp, shlib_ext); errors = try_dlopen (&handle, tmp); /* As before, if the file was found but loading failed, return now with the current error message. */ if (handle || ((errors > 0) && file_not_found ())) { LT_DLFREE (tmp); return handle; } #endif /* Still here? Then we really did fail to locate any of the file names we tried. */ LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND)); LT_DLFREE (tmp); return 0; } int lt_argz_insert (pargz, pargz_len, before, entry) char **pargz; size_t *pargz_len; char *before; const char *entry; { error_t error; if ((error = argz_insert (pargz, pargz_len, before, entry))) { switch (error) { case ENOMEM: LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_MEMORY)); break; default: LT_DLMUTEX_SETERROR (LT_DLSTRERROR (UNKNOWN)); break; } return 1; } return 0; } int lt_argz_insertinorder (pargz, pargz_len, entry) char **pargz; size_t *pargz_len; const char *entry; { char *before = 0; assert (pargz); assert (pargz_len); assert (entry && *entry); if (*pargz) while ((before = argz_next (*pargz, *pargz_len, before))) { int cmp = strcmp (entry, before); if (cmp < 0) break; if (cmp == 0) return 0; /* No duplicates! */ } return lt_argz_insert (pargz, pargz_len, before, entry); } int lt_argz_insertdir (pargz, pargz_len, dirnam, dp) char **pargz; size_t *pargz_len; const char *dirnam; struct dirent *dp; { char *buf = 0; size_t buf_len = 0; char *end = 0; size_t end_offset = 0; size_t dir_len = 0; int errors = 0; assert (pargz); assert (pargz_len); assert (dp); dir_len = LT_STRLEN (dirnam); end = dp->d_name + LT_D_NAMLEN(dp); /* Ignore version numbers. */ { char *p; for (p = end; p -1 > dp->d_name; --p) if (strchr (".0123456789", p[-1]) == 0) break; if (*p == '.') end = p; } /* Ignore filename extension. */ { char *p; for (p = end -1; p > dp->d_name; --p) if (*p == '.') { end = p; break; } } /* Prepend the directory name. */ end_offset = end - dp->d_name; buf_len = dir_len + 1+ end_offset; buf = LT_EMALLOC (char, 1+ buf_len); if (!buf) return ++errors; assert (buf); strcpy (buf, dirnam); strcat (buf, "/"); strncat (buf, dp->d_name, end_offset); buf[buf_len] = LT_EOS_CHAR; /* Try to insert (in order) into ARGZ/ARGZ_LEN. */ if (lt_argz_insertinorder (pargz, pargz_len, buf) != 0) ++errors; LT_DLFREE (buf); return errors; } int list_files_by_dir (dirnam, pargz, pargz_len) const char *dirnam; char **pargz; size_t *pargz_len; { DIR *dirp = 0; int errors = 0; assert (dirnam && *dirnam); assert (pargz); assert (pargz_len); assert (dirnam[LT_STRLEN(dirnam) -1] != '/'); dirp = opendir (dirnam); if (dirp) { struct dirent *dp = 0; while ((dp = readdir (dirp))) if (dp->d_name[0] != '.') if (lt_argz_insertdir (pargz, pargz_len, dirnam, dp)) { ++errors; break; } closedir (dirp); } else ++errors; return errors; } /* If there are any files in DIRNAME, call the function passed in DATA1 (with the name of each file and DATA2 as arguments). */ static int foreachfile_callback (dirname, data1, data2) char *dirname; lt_ptr data1; lt_ptr data2; { int (*func) LT_PARAMS((const char *filename, lt_ptr data)) = (int (*) LT_PARAMS((const char *filename, lt_ptr data))) data1; int is_done = 0; char *argz = 0; size_t argz_len = 0; if (list_files_by_dir (dirname, &argz, &argz_len) != 0) goto cleanup; if (!argz) goto cleanup; { char *filename = 0; while ((filename = argz_next (argz, argz_len, filename))) if ((is_done = (*func) (filename, data2))) break; } cleanup: LT_DLFREE (argz); return is_done; } /* Call FUNC for each unique extensionless file in SEARCH_PATH, along with DATA. The filenames passed to FUNC would be suitable for passing to lt_dlopenext. The extensions are stripped so that individual modules do not generate several entries (e.g. libfoo.la, libfoo.so, libfoo.so.1, libfoo.so.1.0.0). If SEARCH_PATH is NULL, then the same directories that lt_dlopen would search are examined. */ int lt_dlforeachfile (search_path, func, data) const char *search_path; int (*func) LT_PARAMS ((const char *filename, lt_ptr data)); lt_ptr data; { int is_done = 0; if (search_path) { /* If a specific path was passed, search only the directories listed in it. */ is_done = foreach_dirinpath (search_path, 0, foreachfile_callback, func, data); } else { /* Otherwise search the default paths. */ is_done = foreach_dirinpath (user_search_path, 0, foreachfile_callback, func, data); if (!is_done) { is_done = foreach_dirinpath (getenv("LTDL_LIBRARY_PATH"), 0, foreachfile_callback, func, data); } #ifdef LTDL_SHLIBPATH_VAR if (!is_done) { is_done = foreach_dirinpath (getenv(LTDL_SHLIBPATH_VAR), 0, foreachfile_callback, func, data); } #endif #ifdef LTDL_SYSSEARCHPATH if (!is_done) { is_done = foreach_dirinpath (getenv(LTDL_SYSSEARCHPATH), 0, foreachfile_callback, func, data); } #endif } return is_done; } int lt_dlclose (handle) lt_dlhandle handle; { lt_dlhandle cur, last; int errors = 0; LT_DLMUTEX_LOCK (); /* check whether the handle is valid */ last = cur = handles; while (cur && handle != cur) { last = cur; cur = cur->next; } if (!cur) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE)); ++errors; goto done; } handle->info.ref_count--; /* Note that even with resident modules, we must track the ref_count correctly incase the user decides to reset the residency flag later (even though the API makes no provision for that at the moment). */ if (handle->info.ref_count <= 0 && !LT_DLIS_RESIDENT (handle)) { lt_user_data data = handle->loader->dlloader_data; if (handle != handles) { last->next = handle->next; } else { handles = handle->next; } errors += handle->loader->module_close (data, handle->module); errors += unload_deplibs(handle); LT_DLFREE (handle->info.filename); LT_DLFREE (handle->info.name); LT_DLFREE (handle); goto done; } if (LT_DLIS_RESIDENT (handle)) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CLOSE_RESIDENT_MODULE)); ++errors; } done: LT_DLMUTEX_UNLOCK (); return errors; } lt_ptr lt_dlsym (handle, symbol) lt_dlhandle handle; const char *symbol; { int lensym; char lsym[LT_SYMBOL_LENGTH]; char *sym; lt_ptr address; lt_user_data data; if (!handle) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE)); return 0; } if (!symbol) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND)); return 0; } lensym = LT_STRLEN (symbol) + LT_STRLEN (handle->loader->sym_prefix) + LT_STRLEN (handle->info.name); if (lensym + LT_SYMBOL_OVERHEAD < LT_SYMBOL_LENGTH) { sym = lsym; } else { sym = LT_EMALLOC (char, lensym + LT_SYMBOL_OVERHEAD + 1); if (!sym) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (BUFFER_OVERFLOW)); return 0; } } data = handle->loader->dlloader_data; if (handle->info.name) { const char *saved_error; LT_DLMUTEX_GETERROR (saved_error); /* this is a libtool module */ if (handle->loader->sym_prefix) { strcpy(sym, handle->loader->sym_prefix); strcat(sym, handle->info.name); } else { strcpy(sym, handle->info.name); } strcat(sym, "_LTX_"); strcat(sym, symbol); /* try "modulename_LTX_symbol" */ address = handle->loader->find_sym (data, handle->module, sym); if (address) { if (sym != lsym) { LT_DLFREE (sym); } return address; } LT_DLMUTEX_SETERROR (saved_error); } /* otherwise try "symbol" */ if (handle->loader->sym_prefix) { strcpy(sym, handle->loader->sym_prefix); strcat(sym, symbol); } else { strcpy(sym, symbol); } address = handle->loader->find_sym (data, handle->module, sym); if (sym != lsym) { LT_DLFREE (sym); } return address; } const char * lt_dlerror () { const char *error; LT_DLMUTEX_GETERROR (error); LT_DLMUTEX_SETERROR (0); return error ? error : LT_DLSTRERROR (UNKNOWN); } int lt_dlpath_insertdir (ppath, before, dir) char **ppath; char *before; const char *dir; { int errors = 0; char *canonical = 0; char *argz = 0; size_t argz_len = 0; assert (ppath); assert (dir && *dir); if (canonicalize_path (dir, &canonical) != 0) { ++errors; goto cleanup; } assert (canonical && *canonical); /* If *PPATH is empty, set it to DIR. */ if (*ppath == 0) { assert (!before); /* BEFORE cannot be set without PPATH. */ assert (dir); /* Without DIR, don't call this function! */ *ppath = lt_estrdup (dir); if (*ppath == 0) ++errors; return errors; } assert (ppath && *ppath); if (argzize_path (*ppath, &argz, &argz_len) != 0) { ++errors; goto cleanup; } /* Convert BEFORE into an equivalent offset into ARGZ. This only works if *PPATH is already canonicalized, and hence does not change length with respect to ARGZ. We canonicalize each entry as it is added to the search path, and don't call this function with (uncanonicalized) user paths, so this is a fair assumption. */ if (before) { assert (*ppath <= before); assert (before - *ppath <= strlen (*ppath)); before = before - *ppath + argz; } if (lt_argz_insert (&argz, &argz_len, before, dir) != 0) { ++errors; goto cleanup; } argz_stringify (argz, argz_len, LT_PATHSEP_CHAR); LT_DLMEM_REASSIGN (*ppath, argz); cleanup: LT_DLFREE (canonical); LT_DLFREE (argz); return errors; } int lt_dladdsearchdir (search_dir) const char *search_dir; { int errors = 0; if (search_dir && *search_dir) { LT_DLMUTEX_LOCK (); if (lt_dlpath_insertdir (&user_search_path, 0, search_dir) != 0) ++errors; LT_DLMUTEX_UNLOCK (); } return errors; } int lt_dlinsertsearchdir (before, search_dir) const char *before; const char *search_dir; { int errors = 0; if (before) { LT_DLMUTEX_LOCK (); if ((before < user_search_path) || (before >= user_search_path + LT_STRLEN (user_search_path))) { LT_DLMUTEX_UNLOCK (); LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_POSITION)); return 1; } LT_DLMUTEX_UNLOCK (); } if (search_dir && *search_dir) { LT_DLMUTEX_LOCK (); if (lt_dlpath_insertdir (&user_search_path, (char *) before, search_dir) != 0) { ++errors; } LT_DLMUTEX_UNLOCK (); } return errors; } int lt_dlsetsearchpath (search_path) const char *search_path; { int errors = 0; LT_DLMUTEX_LOCK (); LT_DLFREE (user_search_path); LT_DLMUTEX_UNLOCK (); if (!search_path || !LT_STRLEN (search_path)) { return errors; } LT_DLMUTEX_LOCK (); if (canonicalize_path (search_path, &user_search_path) != 0) ++errors; LT_DLMUTEX_UNLOCK (); return errors; } const char * lt_dlgetsearchpath () { const char *saved_path; LT_DLMUTEX_LOCK (); saved_path = user_search_path; LT_DLMUTEX_UNLOCK (); return saved_path; } int lt_dlmakeresident (handle) lt_dlhandle handle; { int errors = 0; if (!handle) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE)); ++errors; } else { LT_DLSET_FLAG (handle, LT_DLRESIDENT_FLAG); } return errors; } int lt_dlisresident (handle) lt_dlhandle handle; { if (!handle) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE)); return -1; } return LT_DLIS_RESIDENT (handle); }  /* --- MODULE INFORMATION --- */ const lt_dlinfo * lt_dlgetinfo (handle) lt_dlhandle handle; { if (!handle) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE)); return 0; } return &(handle->info); } lt_dlhandle lt_dlhandle_next (place) lt_dlhandle place; { return place ? place->next : handles; } int lt_dlforeach (func, data) int (*func) LT_PARAMS((lt_dlhandle handle, lt_ptr data)); lt_ptr data; { int errors = 0; lt_dlhandle cur; LT_DLMUTEX_LOCK (); cur = handles; while (cur) { lt_dlhandle tmp = cur; cur = cur->next; if ((*func) (tmp, data)) { ++errors; break; } } LT_DLMUTEX_UNLOCK (); return errors; } lt_dlcaller_id lt_dlcaller_register () { static lt_dlcaller_id last_caller_id = 0; int result; LT_DLMUTEX_LOCK (); result = ++last_caller_id; LT_DLMUTEX_UNLOCK (); return result; } lt_ptr lt_dlcaller_set_data (key, handle, data) lt_dlcaller_id key; lt_dlhandle handle; lt_ptr data; { int n_elements = 0; lt_ptr stale = (lt_ptr) 0; int i; /* This needs to be locked so that the caller data can be updated simultaneously by different threads. */ LT_DLMUTEX_LOCK (); if (handle->caller_data) while (handle->caller_data[n_elements].key) ++n_elements; for (i = 0; i < n_elements; ++i) { if (handle->caller_data[i].key == key) { stale = handle->caller_data[i].data; break; } } /* Ensure that there is enough room in this handle's caller_data array to accept a new element (and an empty end marker). */ if (i == n_elements) { lt_caller_data *temp = LT_DLREALLOC (lt_caller_data, handle->caller_data, 2+ n_elements); if (!temp) { stale = 0; goto done; } handle->caller_data = temp; /* We only need this if we needed to allocate a new caller_data. */ handle->caller_data[i].key = key; handle->caller_data[1+ i].key = 0; } handle->caller_data[i].data = data; done: LT_DLMUTEX_UNLOCK (); return stale; } lt_ptr lt_dlcaller_get_data (key, handle) lt_dlcaller_id key; lt_dlhandle handle; { lt_ptr result = (lt_ptr) 0; /* This needs to be locked so that the caller data isn't updated by another thread part way through this function. */ LT_DLMUTEX_LOCK (); /* Locate the index of the element with a matching KEY. */ { int i; for (i = 0; handle->caller_data[i].key; ++i) { if (handle->caller_data[i].key == key) { result = handle->caller_data[i].data; break; } } } LT_DLMUTEX_UNLOCK (); return result; }  /* --- USER MODULE LOADER API --- */ int lt_dlloader_add (place, dlloader, loader_name) lt_dlloader *place; const struct lt_user_dlloader *dlloader; const char *loader_name; { int errors = 0; lt_dlloader *node = 0, *ptr = 0; if ((dlloader == 0) /* diagnose null parameters */ || (dlloader->module_open == 0) || (dlloader->module_close == 0) || (dlloader->find_sym == 0)) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER)); return 1; } /* Create a new dlloader node with copies of the user callbacks. */ node = LT_EMALLOC (lt_dlloader, 1); if (!node) return 1; node->next = 0; node->loader_name = loader_name; node->sym_prefix = dlloader->sym_prefix; node->dlloader_exit = dlloader->dlloader_exit; node->module_open = dlloader->module_open; node->module_close = dlloader->module_close; node->find_sym = dlloader->find_sym; node->dlloader_data = dlloader->dlloader_data; LT_DLMUTEX_LOCK (); if (!loaders) { /* If there are no loaders, NODE becomes the list! */ loaders = node; } else if (!place) { /* If PLACE is not set, add NODE to the end of the LOADERS list. */ for (ptr = loaders; ptr->next; ptr = ptr->next) { /*NOWORK*/; } ptr->next = node; } else if (loaders == place) { /* If PLACE is the first loader, NODE goes first. */ node->next = place; loaders = node; } else { /* Find the node immediately preceding PLACE. */ for (ptr = loaders; ptr->next != place; ptr = ptr->next) { /*NOWORK*/; } if (ptr->next != place) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER)); ++errors; } else { /* Insert NODE between PTR and PLACE. */ node->next = place; ptr->next = node; } } LT_DLMUTEX_UNLOCK (); return errors; } int lt_dlloader_remove (loader_name) const char *loader_name; { lt_dlloader *place = lt_dlloader_find (loader_name); lt_dlhandle handle; int errors = 0; if (!place) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER)); return 1; } LT_DLMUTEX_LOCK (); /* Fail if there are any open modules which use this loader. */ for (handle = handles; handle; handle = handle->next) { if (handle->loader == place) { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (REMOVE_LOADER)); ++errors; goto done; } } if (place == loaders) { /* PLACE is the first loader in the list. */ loaders = loaders->next; } else { /* Find the loader before the one being removed. */ lt_dlloader *prev; for (prev = loaders; prev->next; prev = prev->next) { if (!strcmp (prev->next->loader_name, loader_name)) { break; } } place = prev->next; prev->next = prev->next->next; } if (place->dlloader_exit) { errors = place->dlloader_exit (place->dlloader_data); } LT_DLFREE (place); done: LT_DLMUTEX_UNLOCK (); return errors; } lt_dlloader * lt_dlloader_next (place) lt_dlloader *place; { lt_dlloader *next; LT_DLMUTEX_LOCK (); next = place ? place->next : loaders; LT_DLMUTEX_UNLOCK (); return next; } const char * lt_dlloader_name (place) lt_dlloader *place; { const char *name = 0; if (place) { LT_DLMUTEX_LOCK (); name = place ? place->loader_name : 0; LT_DLMUTEX_UNLOCK (); } else { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER)); } return name; } lt_user_data * lt_dlloader_data (place) lt_dlloader *place; { lt_user_data *data = 0; if (place) { LT_DLMUTEX_LOCK (); data = place ? &(place->dlloader_data) : 0; LT_DLMUTEX_UNLOCK (); } else { LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER)); } return data; } lt_dlloader * lt_dlloader_find (loader_name) const char *loader_name; { lt_dlloader *place = 0; LT_DLMUTEX_LOCK (); for (place = loaders; place; place = place->next) { if (strcmp (place->loader_name, loader_name) == 0) { break; } } LT_DLMUTEX_UNLOCK (); return place; }