posix/spawn_faction_init.c

   1 /* Copyright (C) 2000-2017 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    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <spawn.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22
  23 #include "spawn_int.h"
  24
  25
  26 /* Function used to increase the size of the allocated array.  This
  27    function is called from the `add'-functions.  */
  28 int
  29 __posix_spawn_file_actions_realloc (posix_spawn_file_actions_t *file_actions)
  30 {
  31   int newalloc = file_actions->__allocated + 8;
  32   void *newmem = realloc (file_actions->__actions,
  33                           newalloc * sizeof (struct __spawn_action));
  34
  35   if (newmem == NULL)
  36     /* Not enough memory.  */
  37     return ENOMEM;
  38
  39   file_actions->__actions = (struct __spawn_action *) newmem;
  40   file_actions->__allocated = newalloc;
  41
  42   return 0;
  43 }
  44
  45
  46 /* Initialize data structure for file attribute for `spawn' call.  */
  47 int
  48 posix_spawn_file_actions_init (posix_spawn_file_actions_t *file_actions)
  49 {
  50   /* Simply clear all the elements.  */
  51   memset (file_actions, '\0', sizeof (*file_actions));
  52   return 0;
  53 }