1 /* Copyright (C) 2000-2022 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 <https://www.gnu.org/licenses/>. */ 17 18 #include <errno.h> 19 #include <spawn.h> 20 #include <unistd.h> 21 22 #include "spawn_int.h" 23 24 /* Add an action to FILE-ACTIONS which tells the implementation to call 25 `dup2' for the given file descriptors during the `spawn' call. */ 26 int __posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t * file_actions,int fd,int newfd)27__posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *file_actions, 28 int fd, int newfd) 29 { 30 struct __spawn_action *rec; 31 32 if (!__spawn_valid_fd (fd) || !__spawn_valid_fd (newfd)) 33 return EBADF; 34 35 /* Allocate more memory if needed. */ 36 if (file_actions->__used == file_actions->__allocated 37 && __posix_spawn_file_actions_realloc (file_actions) != 0) 38 /* This can only mean we ran out of memory. */ 39 return ENOMEM; 40 41 /* Add the new value. */ 42 rec = &file_actions->__actions[file_actions->__used]; 43 rec->tag = spawn_do_dup2; 44 rec->action.dup2_action.fd = fd; 45 rec->action.dup2_action.newfd = newfd; 46 47 /* Account for the new entry. */ 48 ++file_actions->__used; 49 50 return 0; 51 } 52 weak_alias (__posix_spawn_file_actions_adddup2, 53 posix_spawn_file_actions_adddup2) 54