+
−/* Provide relocatable programs.
+
−   Copyright (C) 2003-2013 Free Software Foundation, Inc.
+
−   Written by Bruno Haible <bruno@clisp.org>, 2003.
+
−
+
−   This program is free software: you can redistribute it and/or modify
+
−   it under the terms of the GNU General Public License as published by
+
−   the Free Software Foundation; either version 3 of the License, or
+
−   (at your option) any later version.
+
−
+
−   This program 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 General Public License for more details.
+
−
+
−   You should have received a copy of the GNU General Public License
+
−   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
−
+
−
+
−#define _GL_USE_STDLIB_ALLOC 1
+
−#include <config.h>
+
−
+
−/* Specification.  */
+
−#include "progname.h"
+
−
+
−#include <stdbool.h>
+
−#include <stdio.h>
+
−#include <stdlib.h>
+
−#include <string.h>
+
−#include <fcntl.h>
+
−#include <unistd.h>
+
−#include <sys/stat.h>
+
−
+
−/* Get declaration of _NSGetExecutablePath on Mac OS X 10.2 or newer.  */
+
−#if HAVE_MACH_O_DYLD_H
+
−# include <mach-o/dyld.h>
+
−#endif
+
−
+
−#if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__
+
−# define WINDOWS_NATIVE
+
−#endif
+
−
+
−#ifdef WINDOWS_NATIVE
+
−# define WIN32_LEAN_AND_MEAN
+
−# include <windows.h>
+
−#endif
+
−
+
−#include "relocatable.h"
+
−
+
−#ifdef NO_XMALLOC
+
−# include "areadlink.h"
+
−# define xreadlink areadlink
+
−#else
+
−# include "xreadlink.h"
+
−#endif
+
−
+
−#ifdef NO_XMALLOC
+
−# define xmalloc malloc
+
−# define xstrdup strdup
+
−#else
+
−# include "xalloc.h"
+
−#endif
+
−
+
−#ifndef O_EXEC
+
−# define O_EXEC O_RDONLY /* This is often close enough in older systems.  */
+
−#endif
+
−
+
−/* Declare canonicalize_file_name.
+
−   The <stdlib.h> included above may be the system's one, not the gnulib
+
−   one.  */
+
−extern char * canonicalize_file_name (const char *name);
+
−
+
−/* Pathname support.
+
−   ISSLASH(C)           tests whether C is a directory separator character.
+
−   IS_PATH_WITH_DIR(P)  tests whether P contains a directory specification.
+
− */
+
−#if ((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__) || defined __EMX__ || defined __DJGPP__
+
−  /* Native Windows, OS/2, DOS */
+
−# define ISSLASH(C) ((C) == '/' || (C) == '\\')
+
−# define HAS_DEVICE(P) \
+
−    ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \
+
−     && (P)[1] == ':')
+
−# define IS_PATH_WITH_DIR(P) \
+
−    (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P))
+
−# define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
+
−#else
+
−  /* Unix */
+
−# define ISSLASH(C) ((C) == '/')
+
−# define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL)
+
−# define FILE_SYSTEM_PREFIX_LEN(P) 0
+
−#endif
+
−
+
−/* The results of open() in this file are not used with fchdir,
+
−   therefore save some unnecessary work in fchdir.c.  */
+
−#undef open
+
−#undef close
+
−
+
−/* Use the system functions, not the gnulib overrides in this file.  */
+
−#undef sprintf
+
−
+
−#undef set_program_name
+
−
+
−
+
−#if ENABLE_RELOCATABLE
+
−
+
−#if defined __linux__ || defined __CYGWIN__
+
−/* File descriptor of the executable.
+
−   (Only used to verify that we find the correct executable.)  */
+
−static int executable_fd = -1;
+
−#endif
+
−
+
−/* Tests whether a given pathname may belong to the executable.  */
+
−static bool
+
−maybe_executable (const char *filename)
+
−{
+
−  /* The native Windows API lacks the access() function.  */
+
−#if !defined WINDOWS_NATIVE
+
−  if (access (filename, X_OK) < 0)
+
−    return false;
+
−#endif
+
−
+
−#if defined __linux__ || defined __CYGWIN__
+
−  if (executable_fd >= 0)
+
−    {
+
−      /* If we already have an executable_fd, check that filename points to
+
−         the same inode.  */
+
−      struct stat statexe;
+
−      struct stat statfile;
+
−
+
−      if (fstat (executable_fd, &statexe) >= 0)
+
−        {
+
−          if (stat (filename, &statfile) < 0)
+
−            return false;
+
−          if (!(statfile.st_dev
+
−                && statfile.st_dev == statexe.st_dev
+
−                && statfile.st_ino == statexe.st_ino))
+
−            return false;
+
−        }
+
−    }
+
−#endif
+
−
+
−  return true;
+
−}
+
−
+
−/* Determine the full pathname of the current executable, freshly allocated.
+
−   Return NULL if unknown.
+
−   Guaranteed to work on Linux and native Windows.  Likely to work on the
+
−   other Unixes (maybe except BeOS), under most conditions.  */
+
−static char *
+
−find_executable (const char *argv0)
+
−{
+
−#if defined WINDOWS_NATIVE
+
−  /* Native Windows only.
+
−     On Cygwin, it is better to use the Cygwin provided /proc interface, than
+
−     to use native Windows API and cygwin_conv_to_posix_path, because it
+
−     supports longer file names
+
−     (see <http://cygwin.com/ml/cygwin/2011-01/msg00410.html>).  */
+
−  char location[MAX_PATH];
+
−  int length = GetModuleFileName (NULL, location, sizeof (location));
+
−  if (length < 0)
+
−    return NULL;
+
−  if (!IS_PATH_WITH_DIR (location))
+
−    /* Shouldn't happen.  */
+
−    return NULL;
+
−  return xstrdup (location);
+
−#else /* Unix */
+
−# ifdef __linux__
+
−  /* The executable is accessible as /proc/<pid>/exe.  In newer Linux
+
−     versions, also as /proc/self/exe.  Linux >= 2.1 provides a symlink
+
−     to the true pathname; older Linux versions give only device and ino,
+
−     enclosed in brackets, which we cannot use here.  */
+
−  {
+
−    char *link;
+
−
+
−    link = xreadlink ("/proc/self/exe");
+
−    if (link != NULL && link[0] != '[')
+
−      return link;
+
−    if (executable_fd < 0)
+
−      executable_fd = open ("/proc/self/exe", O_EXEC, 0);
+
−
+
−    {
+
−      char buf[6+10+5];
+
−      sprintf (buf, "/proc/%d/exe", getpid ());
+
−      link = xreadlink (buf);
+
−      if (link != NULL && link[0] != '[')
+
−        return link;
+
−      if (executable_fd < 0)
+
−        executable_fd = open (buf, O_EXEC, 0);
+
−    }
+
−  }
+
−# endif
+
−# ifdef __CYGWIN__
+
−  /* The executable is accessible as /proc/<pid>/exe, at least in
+
−     Cygwin >= 1.5.  */
+
−  {
+
−    char *link;
+
−
+
−    link = xreadlink ("/proc/self/exe");
+
−    if (link != NULL)
+
−      return link;
+
−    if (executable_fd < 0)
+
−      executable_fd = open ("/proc/self/exe", O_EXEC, 0);
+
−  }
+
−# endif
+
−# if HAVE_MACH_O_DYLD_H && HAVE__NSGETEXECUTABLEPATH
+
−  /* On Mac OS X 10.2 or newer, the function
+
−       int _NSGetExecutablePath (char *buf, uint32_t *bufsize);
+
−     can be used to retrieve the executable's full path.  */
+
−  char location[4096];
+
−  unsigned int length = sizeof (location);
+
−  if (_NSGetExecutablePath (location, &length) == 0
+
−      && location[0] == '/')
+
−    return canonicalize_file_name (location);
+
−# endif
+
−  /* Guess the executable's full path.  We assume the executable has been
+
−     called via execlp() or execvp() with properly set up argv[0].  The
+
−     login(1) convention to add a '-' prefix to argv[0] is not supported.  */
+
−  {
+
−    bool has_slash = false;
+
−    {
+
−      const char *p;
+
−      for (p = argv0; *p; p++)
+
−        if (*p == '/')
+
−          {
+
−            has_slash = true;
+
−            break;
+
−          }
+
−    }
+
−    if (!has_slash)
+
−      {
+
−        /* exec searches paths without slashes in the directory list given
+
−           by $PATH.  */
+
−        const char *path = getenv ("PATH");
+
−
+
−        if (path != NULL)
+
−          {
+
−            const char *p;
+
−            const char *p_next;
+
−
+
−            for (p = path; *p; p = p_next)
+
−              {
+
−                const char *q;
+
−                size_t p_len;
+
−                char *concat_name;
+
−
+
−                for (q = p; *q; q++)
+
−                  if (*q == ':')
+
−                    break;
+
−                p_len = q - p;
+
−                p_next = (*q == '\0' ? q : q + 1);
+
−
+
−                /* We have a path item at p, of length p_len.
+
−                   Now concatenate the path item and argv0.  */
+
−                concat_name = (char *) xmalloc (p_len + strlen (argv0) + 2);
+
−# ifdef NO_XMALLOC
+
−                if (concat_name == NULL)
+
−                  return NULL;
+
−# endif
+
−                if (p_len == 0)
+
−                  /* An empty PATH element designates the current directory.  */
+
−                  strcpy (concat_name, argv0);
+
−                else
+
−                  {
+
−                    memcpy (concat_name, p, p_len);
+
−                    concat_name[p_len] = '/';
+
−                    strcpy (concat_name + p_len + 1, argv0);
+
−                  }
+
−                if (maybe_executable (concat_name))
+
−                  return canonicalize_file_name (concat_name);
+
−                free (concat_name);
+
−              }
+
−          }
+
−        /* Not found in the PATH, assume the current directory.  */
+
−      }
+
−    /* exec treats paths containing slashes as relative to the current
+
−       directory.  */
+
−    if (maybe_executable (argv0))
+
−      return canonicalize_file_name (argv0);
+
−  }
+
−  /* No way to find the executable.  */
+
−  return NULL;
+
−#endif
+
−}
+
−
+
−/* Full pathname of executable, or NULL.  */
+
−static char *executable_fullname;
+
−
+
−static void
+
−prepare_relocate (const char *orig_installprefix, const char *orig_installdir,
+
−                  const char *argv0)
+
−{
+
−  char *curr_prefix;
+
−
+
−  /* Determine the full pathname of the current executable.  */
+
−  executable_fullname = find_executable (argv0);
+
−
+
−  /* Determine the current installation prefix from it.  */
+
−  curr_prefix = compute_curr_prefix (orig_installprefix, orig_installdir,
+
−                                     executable_fullname);
+
−  if (curr_prefix != NULL)
+
−    {
+
−      /* Now pass this prefix to all copies of the relocate.c source file.  */
+
−      set_relocation_prefix (orig_installprefix, curr_prefix);
+
−
+
−      free (curr_prefix);
+
−    }
+
−}
+
−
+
−/* Set program_name, based on argv[0], and original installation prefix and
+
−   directory, for relocatability.  */
+
−void
+
−set_program_name_and_installdir (const char *argv0,
+
−                                 const char *orig_installprefix,
+
−                                 const char *orig_installdir)
+
−{
+
−  const char *argv0_stripped = argv0;
+
−
+
−  /* Relocatable programs are renamed to .bin by install-reloc.  Or, more
+
−     generally, their suffix is changed from $exeext to .bin$exeext.
+
−     Remove the ".bin" here.  */
+
−  {
+
−    size_t argv0_len = strlen (argv0);
+
−    const size_t exeext_len = sizeof (EXEEXT) - sizeof ("");
+
−    if (argv0_len > 4 + exeext_len)
+
−      if (memcmp (argv0 + argv0_len - exeext_len - 4, ".bin", 4) == 0)
+
−        {
+
−          if (sizeof (EXEEXT) > sizeof (""))
+
−            {
+
−              /* Compare using an inlined copy of c_strncasecmp(), because
+
−                 the filenames may have undergone a case conversion since
+
−                 they were packaged.  In other words, EXEEXT may be ".exe"
+
−                 on one system and ".EXE" on another.  */
+
−              static const char exeext[] = EXEEXT;
+
−              const char *s1 = argv0 + argv0_len - exeext_len;
+
−              const char *s2 = exeext;
+
−              for (; *s1 != '\0'; s1++, s2++)
+
−                {
+
−                  unsigned char c1 = *s1;
+
−                  unsigned char c2 = *s2;
+
−                  if ((c1 >= 'A' && c1 <= 'Z' ? c1 - 'A' + 'a' : c1)
+
−                      != (c2 >= 'A' && c2 <= 'Z' ? c2 - 'A' + 'a' : c2))
+
−                    goto done_stripping;
+
−                }
+
−            }
+
−          /* Remove ".bin" before EXEEXT or its equivalent.  */
+
−          {
+
−            char *shorter = (char *) xmalloc (argv0_len - 4 + 1);
+
−#ifdef NO_XMALLOC
+
−            if (shorter != NULL)
+
−#endif
+
−              {
+
−                memcpy (shorter, argv0, argv0_len - exeext_len - 4);
+
−                if (sizeof (EXEEXT) > sizeof (""))
+
−                  memcpy (shorter + argv0_len - exeext_len - 4,
+
−                          argv0 + argv0_len - exeext_len - 4,
+
−                          exeext_len);
+
−                shorter[argv0_len - 4] = '\0';
+
−                argv0_stripped = shorter;
+
−              }
+
−          }
+
−         done_stripping: ;
+
−      }
+
−  }
+
−
+
−  set_program_name (argv0_stripped);
+
−
+
−  prepare_relocate (orig_installprefix, orig_installdir, argv0);
+
−}
+
−
+
−/* Return the full pathname of the current executable, based on the earlier
+
−   call to set_program_name_and_installdir.  Return NULL if unknown.  */
+
−char *
+
−get_full_program_name (void)
+
−{
+
−  return executable_fullname;
+
−}
+
−
+
−#endif