posix/spawn_faction_addfchdir.c

   1 /* Add a directory change to a file action list for posix_spawn.
   2    Copyright (C) 2000-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <spawn.h>
  21 #include <string.h>
  22
  23 #include "spawn_int.h"
  24
  25 int
  26 posix_spawn_file_actions_addfchdir_np (posix_spawn_file_actions_t *actions,
  27                                        int fd)
  28 {
  29   struct __spawn_action *rec;
  30
  31   /* Allocate more memory if needed.  */
  32   if (actions->__used == actions->__allocated
  33       && __posix_spawn_file_actions_realloc (actions) != 0)
  34     /* This can only mean we ran out of memory.  */
  35     return ENOMEM;
  36
  37   /* Add the new value.  */
  38   rec = &actions->__actions[actions->__used];
  39   rec->tag = spawn_do_fchdir;
  40   rec->action.fchdir_action.fd = fd;
  41
  42   /* Account for the new entry.  */
  43   ++actions->__used;
  44
  45   return 0;
  46 }