lib/spawn_faction_addchdir.c

   1 /* Copyright (C) 2018-2024 Free Software Foundation, Inc.
   2
   3    This file is free software: you can redistribute it and/or modify
   4    it under the terms of the GNU Lesser General Public License as
   5    published by the Free Software Foundation; either version 2.1 of the
   6    License, or (at your option) any later version.
   7
   8    This file is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU Lesser General Public License for more details.
  12
  13    You should have received a copy of the GNU Lesser General Public License
  14    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  15
  16 #include <config.h>
  17
  18 /* Specification.  */
  19 #include <spawn.h>
  20
  21 #include <errno.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #if REPLACE_POSIX_SPAWN
  26 # include "spawn_int.h"
  27 #endif
  28
  29 /* Add an action to FILE-ACTIONS which tells the implementation to call
  30    'chdir' to the given directory during the 'spawn' call.  */
  31 int
  32 posix_spawn_file_actions_addchdir (posix_spawn_file_actions_t *file_actions,
  33                                    const char *path)
  34 #undef posix_spawn_file_actions_addchdir
  35 {
  36 #if !REPLACE_POSIX_SPAWN
  37   return posix_spawn_file_actions_addchdir_np (file_actions, path);
  38 #else
  39   {
  40     /* Copy PATH, because the caller may free it before calling posix_spawn()
  41        or posix_spawnp().  */
  42     char *path_copy = strdup (path);
  43     if (path_copy == NULL)
  44       return ENOMEM;
  45
  46     /* Allocate more memory if needed.  */
  47     if (file_actions->_used == file_actions->_allocated
  48         && __posix_spawn_file_actions_realloc (file_actions) != 0)
  49       {
  50         /* This can only mean we ran out of memory.  */
  51         free (path_copy);
  52         return ENOMEM;
  53       }
  54
  55     {
  56       struct __spawn_action *rec;
  57
  58       /* Add the new value.  */
  59       rec = &file_actions->_actions[file_actions->_used];
  60       rec->tag = spawn_do_chdir;
  61       rec->action.chdir_action.path = path_copy;
  62
  63       /* Account for the new entry.  */
  64       ++file_actions->_used;
  65
  66       return 0;
  67     }
  68   }
  69 #endif
  70 }