1  /* Copyright (C) 2018-2023 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  }