/*
* Copyright (C) 2003-2014 The Music Player Daemon Project
* http://www.musicpd.org
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This library provides easy helper functions for working with file
* descriptors. It has wrappers for taking advantage of Linux 2.6
* specific features like O_CLOEXEC.
*
*/
#ifndef FD_UTIL_H
#define FD_UTIL_H
#include "check.h"
#include <stdbool.h>
#include <stddef.h>
#ifndef WIN32
#if !defined(_GNU_SOURCE) && (defined(HAVE_PIPE2) || defined(HAVE_ACCEPT4))
#define _GNU_SOURCE
#endif
#include <sys/types.h>
#endif
struct sockaddr;
#ifdef __cplusplus
extern "C" {
#endif
/**
* Wrapper for dup(), which sets the CLOEXEC flag on the new
* descriptor.
*/
int
dup_cloexec(int oldfd);
/**
* Wrapper for open(), which sets the CLOEXEC flag (atomically if
* supported by the OS).
*/
int
open_cloexec(const char *path_fs, int flags, int mode);
/**
* Wrapper for pipe(), which sets the CLOEXEC flag (atomically if
* supported by the OS).
*/
int
pipe_cloexec(int fd[2]);
/**
* Wrapper for pipe(), which sets the CLOEXEC flag (atomically if
* supported by the OS).
*
* On systems that supports it (everybody except for Windows), it also
* sets the NONBLOCK flag.
*/
int
pipe_cloexec_nonblock(int fd[2]);
#ifndef WIN32
/**
* Wrapper for socketpair(), which sets the CLOEXEC flag (atomically
* if supported by the OS).
*/
int
socketpair_cloexec(int domain, int type, int protocol, int sv[2]);
/**
* Wrapper for socketpair(), which sets the flags CLOEXEC and NONBLOCK
* (atomically if supported by the OS).
*/
int
socketpair_cloexec_nonblock(int domain, int type, int protocol, int sv[2]);
#endif
#ifdef HAVE_LIBMPDCLIENT
/* Avoid symbol conflict with statically linked libmpdclient */
#define socket_cloexec_nonblock socket_cloexec_nonblock_noconflict
#endif
/**
* Wrapper for socket(), which sets the CLOEXEC and the NONBLOCK flag
* (atomically if supported by the OS).
*/
int
socket_cloexec_nonblock(int domain, int type, int protocol);
/**
* Wrapper for accept(), which sets the CLOEXEC and the NONBLOCK flags
* (atomically if supported by the OS).
*/
int
accept_cloexec_nonblock(int fd, struct sockaddr *address,
size_t *address_length_r);
#ifndef WIN32
struct msghdr;
/**
* Wrapper for recvmsg(), which sets the CLOEXEC flag (atomically if
* supported by the OS).
*/
ssize_t
recvmsg_cloexec(int sockfd, struct msghdr *msg, int flags);
#endif
#ifdef HAVE_INOTIFY_INIT
/**
* Wrapper for inotify_init(), which sets the CLOEXEC flag (atomically
* if supported by the OS).
*/
int
inotify_init_cloexec(void);
#endif
#ifdef USE_EVENTFD
/**
* Wrapper for eventfd() which sets the flags CLOEXEC and NONBLOCK
* flag (atomically if supported by the OS).
*/
int
eventfd_cloexec_nonblock(unsigned initval, int flags);
#endif
/**
* Portable wrapper for close(); use closesocket() on WIN32/WinSock.
*/
int
close_socket(int fd);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif
