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* Versions.def (ld.so): Add GLIBC_2.1.1. * elf/Makefile (routines): Add dl-origin. (tests): Add origtest. Add dependencies for the program. * elf/Versions (ld.so) [GLIBC_2.1.1]: Add _dl_origin_path, _dl_platformlen, _dl_dst_count and _dl_dst_substitute. * elf/dl-deps.c (expand_dst): New macro. Expand DSTs in filename. (_dl_map_object_deps): Use expand_dst to expand DSTs in DT_NEEDED, DT_AUXILIARY, and DT_FILTER filenames. * elf/dl-load.c (expand_dynamic_string_token): Explode into two functions and three macros. (_dl_dst_count, _dl_dst_substitute): New functions. * elf/dl-dst.h: New file. * elf/dl-open.c (_dl_open): Take extra parameter with address of caller. Pass address in args structure. (dl_open_worker): Recognize and expand DSTs in filename. * elf/ldsodefs.h (_dl_open): Adapt prototype. * elf/dlopen.c (dlopen_doit): Pass caller address to _dl_open. (__dlopen_check): Pass caller address to dlopen_doit in args. * elf/dlopendoit.c: Likewise. * iconv/gconv_dl.c: Adapt call of _dl_open. * nss/nsswitch.c: Likewise. * elf/origtest.c: New file. * sysdeps/generic/dl-origin.h: Moved to... * sysdeps/generic/dl-origin.c: ...here. * sysdeps/unix/sysv/linux/dl-origin.h: Moved to... * sysdeps/unix/sysv/linux/dl-origin.c: ...here.
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/* Find path of executable.
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Copyright (C) 1998, 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/param.h>
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#include <elf/ldsodefs.h>
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#include <dl-dst.h>
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/* On Linux >= 2.1 systems which have the dcache implementation we can get
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the path of the application from the /proc/self/exe symlink. Try this
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first and fall back on the generic method if necessary. */
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extern const char *_dl_origin_path;
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const char *
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_dl_get_origin (void)
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{
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char linkval[PATH_MAX];
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char *result;
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if (readlink ("/proc/self/exe", linkval, PATH_MAX) != -1
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&& linkval[0] != '[')
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{
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/* We can use this value. */
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char *last_slash = strrchr (linkval, '/');
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result = (char *) malloc (last_slash - linkval + 1);
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if (result == NULL)
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result = (char *) -1;
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else if (last_slash == linkval)
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memcpy (result, "/", 2);
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else
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*((char *) __mempcpy (result, linkval, last_slash - linkval)) = '\0';
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}
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else
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{
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result = (char *) -1;
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/* We use the environment variable LD_ORIGIN_PATH. If it is set make
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a copy and strip out trailing slashes. */
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if (_dl_origin_path != NULL)
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{
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size_t len = strlen (_dl_origin_path);
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result = malloc (len + 1);
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if (result == NULL)
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result = (char *) -1;
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else
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{
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char *cp = __mempcpy (result, _dl_origin_path, len);
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while (cp > result + 1 && cp[-1] == '/')
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--cp;
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*cp = '\0';
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}
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}
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}
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return result;
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}
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