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/* 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#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 of 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;
}
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