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/* Copyright (C) 2000, 2009-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
This file 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.
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <spawn.h>
#include <errno.h>
#include <unistd.h>
#if !_LIBC
# define __sysconf(open_max) getdtablesize ()
#endif
#if REPLACE_POSIX_SPAWN
# include "spawn_int.h"
#endif
/* 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)
#undef posix_spawn_file_actions_adddup2
{
int maxfd = __sysconf (_SC_OPEN_MAX);
/* Test for the validity of the file descriptor. */
if (fd < 0 || newfd < 0 || fd >= maxfd || newfd >= maxfd)
return EBADF;
#if !REPLACE_POSIX_SPAWN
return posix_spawn_file_actions_adddup2 (file_actions, fd, newfd);
#else
/* 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;
{
struct __spawn_action *rec;
/* 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;
}
#endif
}
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