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/*
* Copyright (C) 2003-2009 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "fd_util.h"
#include "config.h"
#if !defined(_GNU_SOURCE) && (defined(HAVE_PIPE2) || defined(HAVE_ACCEPT4))
#define _GNU_SOURCE
#endif
#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#ifdef WIN32
#include <winsock2.h>
#else
#include <sys/socket.h>
#endif
#ifdef HAVE_INOTIFY_INIT
#include <sys/inotify.h>
#endif
#ifndef WIN32
static int
fd_mask_flags(int fd, int and_mask, int xor_mask)
{
int ret;
assert(fd >= 0);
ret = fcntl(fd, F_GETFD, 0);
if (ret < 0)
return ret;
return fcntl(fd, F_SETFD, (ret & and_mask) ^ xor_mask);
}
#endif /* !WIN32 */
static int
fd_set_cloexec(int fd, bool enable)
{
#ifndef WIN32
return fd_mask_flags(fd, ~FD_CLOEXEC, enable ? FD_CLOEXEC : 0);
#else
(void)fd;
(void)enable;
#endif
}
/**
* Enables non-blocking mode for the specified file descriptor. On
* WIN32, this function only works for sockets.
*/
static int
fd_set_nonblock(int fd)
{
#ifdef WIN32
u_long val = 1;
return ioctlsocket(fd, FIONBIO, &val);
#else
int flags;
assert(fd >= 0);
flags = fcntl(fd, F_GETFL);
if (flags < 0)
return flags;
return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
#endif
}
int
open_cloexec(const char *path_fs, int flags)
{
int fd;
#ifdef O_CLOEXEC
flags |= O_CLOEXEC;
#endif
#ifdef O_NOCTTY
flags |= O_NOCTTY;
#endif
fd = open(path_fs, flags, 0666);
fd_set_cloexec(fd, true);
return fd;
}
int
creat_cloexec(const char *path_fs, int mode)
{
int flags = O_CREAT|O_WRONLY|O_TRUNC;
int fd;
#ifdef O_CLOEXEC
flags |= O_CLOEXEC;
#endif
#ifdef O_NOCTTY
flags |= O_NOCTTY;
#endif
fd = open(path_fs, flags, mode);
fd_set_cloexec(fd, true);
return fd;
}
int
pipe_cloexec_nonblock(int fd[2])
{
#ifdef WIN32
return _pipe(event_pipe, 512, _O_BINARY);
#else
int ret;
#ifdef HAVE_PIPE2
ret = pipe2(fd, O_CLOEXEC|O_NONBLOCK);
if (ret >= 0 || errno != ENOSYS)
return ret;
#endif
ret = pipe(fd);
if (ret >= 0) {
fd_set_cloexec(fd[0], true);
fd_set_cloexec(fd[1], true);
#ifndef WIN32
fd_set_nonblock(fd[0]);
fd_set_nonblock(fd[1]);
#endif
}
return ret;
#endif
}
int
socket_cloexec_nonblock(int domain, int type, int protocol)
{
int fd;
#if defined(SOCK_CLOEXEC) && defined(SOCK_NONBLOCK)
fd = socket(domain, type | SOCK_CLOEXEC | SOCK_NONBLOCK, protocol);
if (fd >= 0 || errno != EINVAL)
return fd;
#endif
fd = socket(domain, type, protocol);
if (fd >= 0)
fd_set_cloexec(fd, true);
return fd;
}
int
accept_cloexec_nonblock(int fd, struct sockaddr *address,
size_t *address_length_r)
{
int ret;
socklen_t address_length = *address_length_r;
#ifdef HAVE_ACCEPT4
ret = accept4(fd, address, &address_length,
SOCK_CLOEXEC|SOCK_NONBLOCK);
if (ret >= 0 || errno != ENOSYS) {
if (ret >= 0)
*address_length_r = address_length;
return ret;
}
#endif
ret = accept(fd, address, &address_length);
if (ret >= 0) {
fd_set_cloexec(ret, true);
fd_set_nonblock(ret);
*address_length_r = address_length;
}
return ret;
}
#ifdef HAVE_INOTIFY_INIT
int
inotify_init_cloexec(void)
{
int fd;
#ifdef HAVE_INOTIFY_INIT1
fd = inotify_init1(IN_CLOEXEC);
if (fd >= 0 || errno != ENOSYS)
return fd;
#endif
fd = inotify_init();
if (fd >= 0)
fd_set_cloexec(fd, true);
return fd;
}
#endif
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