/* Copyright (C) 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <errno.h> #include <spawn.h> #include <unistd.h> #include "spawn_int.h" /* Add an action to FILE-ACTIONS which tells the implementation to call `dup2' for the given file descriptors during the `spawn' call. */ int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *file_actions, int fd, int newfd) { int maxfd = sysconf(_SC_OPEN_MAX); struct __spawn_action *rec; /* Test for the validity of the file descriptor. */ if (fd < 0 || newfd < 0 || fd >= maxfd || newfd >= maxfd) return EBADF; /* Allocate more memory if needed. */ if (file_actions->__used == file_actions->__allocated && __posix_spawn_file_actions_realloc (file_actions) != 0) /* This can only mean we ran out of memory. */ return ENOMEM; /* Add the new value. */ rec = &file_actions->__actions[file_actions->__used]; rec->tag = spawn_do_dup2; rec->action.dup2_action.fd = fd; rec->action.dup2_action.newfd = newfd; /* Account for the new entry. */ ++file_actions->__used; return 0; }