sysdeps/mach/hurd/execve.c

   1 /* Copyright (C) 1991-2021 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 <hurd.h>
  20 #include <fcntl.h>
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23
  24 /* Replace the current process, executing FILE_NAME with arguments ARGV and
  25    environment ENVP.  ARGV and ENVP are terminated by NULL pointers.  */
  26 int
  27 __execve (const char *file_name, char *const argv[], char *const envp[])
  28 {
  29   error_t err;
  30   char *concat_name = NULL;
  31   const char *abs_path;
  32
  33   file_t file = __file_name_lookup (file_name, O_EXEC, 0);
  34   if (file == MACH_PORT_NULL)
  35     return -1;
  36
  37   if (file_name[0] == '/')
  38     {
  39       /* Already an absolute path */
  40       abs_path = file_name;
  41     }
  42   else
  43     {
  44       /* Relative path */
  45       char *cwd = __getcwd (NULL, 0);
  46       if (cwd == NULL)
  47         {
  48           __mach_port_deallocate (__mach_task_self (), file);
  49           return -1;
  50         }
  51
  52       int res = __asprintf (&concat_name, "%s/%s", cwd, file_name);
  53       free (cwd);
  54       if (res == -1)
  55         {
  56           __mach_port_deallocate (__mach_task_self (), file);
  57           return -1;
  58         }
  59
  60       abs_path = concat_name;
  61     }
  62
  63   /* Hopefully this will not return.  */
  64   err = _hurd_exec_paths (__mach_task_self (), file,
  65                           file_name, abs_path, argv, envp);
  66
  67   /* Oh well.  Might as well be tidy.  */
  68   __mach_port_deallocate (__mach_task_self (), file);
  69   free (concat_name);
  70
  71   return __hurd_fail (err);
  72 }
  73
  74 weak_alias (__execve, execve)