1  /* Add a closefrom to a file action list for posix_spawn.
       2     Copyright (C) 2021-2023 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 <unistd.h>
      22  #include <spawn_int.h>
      23  
      24  int
      25  __posix_spawn_file_actions_addclosefrom (posix_spawn_file_actions_t
      26  					 *file_actions, int from)
      27  {
      28  #if __SPAWN_SUPPORT_CLOSEFROM
      29    struct __spawn_action *rec;
      30  
      31    if (!__spawn_valid_fd (from))
      32      return EBADF;
      33  
      34    /* Allocate more memory if needed.  */
      35    if (file_actions->__used == file_actions->__allocated
      36        && __posix_spawn_file_actions_realloc (file_actions) != 0)
      37      /* This can only mean we ran out of memory.  */
      38      return ENOMEM;
      39  
      40    /* Add the new value.  */
      41    rec = &file_actions->__actions[file_actions->__used];
      42    rec->tag = spawn_do_closefrom;
      43    rec->action.closefrom_action.from = from;
      44  
      45    /* Account for the new entry.  */
      46    ++file_actions->__used;
      47  
      48    return 0;
      49  #else
      50    return EINVAL;
      51  #endif
      52  }
      53  weak_alias (__posix_spawn_file_actions_addclosefrom,
      54  	    posix_spawn_file_actions_addclosefrom_np)
      55  #if !__SPAWN_SUPPORT_CLOSEFROM
      56  stub_warning (posix_spawn_file_actions_addclosefrom_np)
      57  #endif