sysdeps/mach/hurd/execveat.c

   1 /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <unistd.h>
  19 #include <getcwd.h>
  20 #include <hurd.h>
  21 #include <hurd/fd.h>
  22 #include <fcntl.h>
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25
  26 /* Replace the current process, executing FILE_NAME with arguments ARGV and
  27    environment ENVP.  ARGV and ENVP are terminated by NULL pointers.  */
  28 int
  29 __execveat (int dirfd, const char *file_name, char *const argv[],
  30             char *const envp[], int flags)
  31 {
  32   error_t err;
  33   char *concat_name = NULL;
  34   const char *abs_path;
  35
  36   file_t file = __file_name_lookup_at (dirfd, flags, file_name, O_EXEC, 0);
  37   if (file == MACH_PORT_NULL)
  38     return -1;
  39
  40   if (file_name[0] == '/')
  41     {
  42       /* Already an absolute path */
  43       abs_path = file_name;
  44     }
  45   else
  46     {
  47       /* Relative path */
  48       char *cwd;
  49       if (dirfd == AT_FDCWD)
  50         {
  51           cwd = __getcwd (NULL, 0);
  52           if (cwd == NULL)
  53             {
  54               __mach_port_deallocate (__mach_task_self (), file);
  55               return -1;
  56             }
  57         }
  58       else
  59         {
  60           err = HURD_DPORT_USE (dirfd,
  61             (cwd = __hurd_canonicalize_directory_name_internal (port, NULL, 0),
  62              cwd == NULL ? errno : 0));
  63           if (err)
  64             {
  65               __mach_port_deallocate (__mach_task_self (), file);
  66               return __hurd_fail (err);
  67             }
  68         }
  69
  70       int res = __asprintf (&concat_name, "%s/%s", cwd, file_name);
  71       free (cwd);
  72       if (res == -1)
  73         {
  74           __mach_port_deallocate (__mach_task_self (), file);
  75           return -1;
  76         }
  77
  78       abs_path = concat_name;
  79     }
  80
  81   /* Hopefully this will not return.  */
  82   err = _hurd_exec_paths (__mach_task_self (), file,
  83                           file_name, abs_path, argv, envp);
  84
  85   /* Oh well.  Might as well be tidy.  */
  86   __mach_port_deallocate (__mach_task_self (), file);
  87   free (concat_name);
  88
  89   return __hurd_fail (err);
  90 }
  91
  92 weak_alias (__execveat, execveat)