354 lines
6.4 KiB
C
354 lines
6.4 KiB
C
/*
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* Copyright (C) 2003-2011 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h" /* must be first for large file support */
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#include "fd_util.h"
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#if !defined(_GNU_SOURCE) && (defined(HAVE_PIPE2) || defined(HAVE_ACCEPT4))
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#define _GNU_SOURCE
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#endif
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#include <assert.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#ifdef WIN32
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#include <ws2tcpip.h>
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#include <winsock2.h>
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#else
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_INOTIFY_INIT
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#include <sys/inotify.h>
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#endif
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#ifdef USE_EVENTFD
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#include <sys/eventfd.h>
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#endif
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#ifndef WIN32
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static int
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fd_mask_flags(int fd, int and_mask, int xor_mask)
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{
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int ret;
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assert(fd >= 0);
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ret = fcntl(fd, F_GETFD, 0);
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if (ret < 0)
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return ret;
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return fcntl(fd, F_SETFD, (ret & and_mask) ^ xor_mask);
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}
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#endif /* !WIN32 */
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static int
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fd_set_cloexec(int fd, bool enable)
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{
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#ifndef WIN32
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return fd_mask_flags(fd, ~FD_CLOEXEC, enable ? FD_CLOEXEC : 0);
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#else
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(void)fd;
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(void)enable;
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return 0;
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#endif
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}
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/**
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* Enables non-blocking mode for the specified file descriptor. On
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* WIN32, this function only works for sockets.
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*/
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static int
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fd_set_nonblock(int fd)
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{
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#ifdef WIN32
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u_long val = 1;
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return ioctlsocket(fd, FIONBIO, &val);
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#else
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int flags;
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assert(fd >= 0);
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flags = fcntl(fd, F_GETFL);
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if (flags < 0)
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return flags;
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return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
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#endif
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}
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int
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dup_cloexec(int oldfd)
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{
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int newfd = dup(oldfd);
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if (newfd >= 0)
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fd_set_nonblock(newfd);
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return newfd;
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}
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int
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open_cloexec(const char *path_fs, int flags, int mode)
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{
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int fd;
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#ifdef O_CLOEXEC
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flags |= O_CLOEXEC;
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#endif
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#ifdef O_NOCTTY
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flags |= O_NOCTTY;
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#endif
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fd = open(path_fs, flags, mode);
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if (fd >= 0)
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fd_set_cloexec(fd, true);
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return fd;
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}
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int
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pipe_cloexec(int fd[2])
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{
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#ifdef WIN32
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return _pipe(fd, 512, _O_BINARY);
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#else
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int ret;
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#ifdef HAVE_PIPE2
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ret = pipe2(fd, O_CLOEXEC);
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if (ret >= 0 || errno != ENOSYS)
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return ret;
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#endif
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ret = pipe(fd);
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if (ret >= 0) {
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fd_set_cloexec(fd[0], true);
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fd_set_cloexec(fd[1], true);
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}
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return ret;
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#endif
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}
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int
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pipe_cloexec_nonblock(int fd[2])
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{
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#ifdef WIN32
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return _pipe(fd, 512, _O_BINARY);
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#else
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int ret;
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#ifdef HAVE_PIPE2
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ret = pipe2(fd, O_CLOEXEC|O_NONBLOCK);
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if (ret >= 0 || errno != ENOSYS)
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return ret;
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#endif
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ret = pipe(fd);
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if (ret >= 0) {
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fd_set_cloexec(fd[0], true);
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fd_set_cloexec(fd[1], true);
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fd_set_nonblock(fd[0]);
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fd_set_nonblock(fd[1]);
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}
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return ret;
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#endif
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}
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#ifndef WIN32
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int
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socketpair_cloexec(int domain, int type, int protocol, int sv[2])
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{
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int ret;
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#ifdef SOCK_CLOEXEC
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ret = socketpair(domain, type | SOCK_CLOEXEC, protocol, sv);
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if (ret >= 0 || errno != EINVAL)
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return ret;
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#endif
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ret = socketpair(domain, type, protocol, sv);
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if (ret >= 0) {
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fd_set_cloexec(sv[0], true);
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fd_set_cloexec(sv[1], true);
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}
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return ret;
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}
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int
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socketpair_cloexec_nonblock(int domain, int type, int protocol, int sv[2])
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{
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int ret;
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#if defined(SOCK_CLOEXEC) && defined(SOCK_NONBLOCK)
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ret = socketpair(domain, type | SOCK_CLOEXEC | SOCK_NONBLOCK, protocol,
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sv);
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if (ret >= 0 || errno != EINVAL)
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return ret;
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#endif
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ret = socketpair(domain, type, protocol, sv);
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if (ret >= 0) {
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fd_set_cloexec(sv[0], true);
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fd_set_nonblock(sv[0]);
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fd_set_cloexec(sv[1], true);
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fd_set_nonblock(sv[1]);
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}
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return ret;
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}
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#endif
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int
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socket_cloexec_nonblock(int domain, int type, int protocol)
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{
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int fd;
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#if defined(SOCK_CLOEXEC) && defined(SOCK_NONBLOCK)
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fd = socket(domain, type | SOCK_CLOEXEC | SOCK_NONBLOCK, protocol);
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if (fd >= 0 || errno != EINVAL)
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return fd;
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#endif
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fd = socket(domain, type, protocol);
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if (fd >= 0) {
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fd_set_cloexec(fd, true);
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fd_set_nonblock(fd);
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}
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return fd;
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}
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int
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accept_cloexec_nonblock(int fd, struct sockaddr *address,
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size_t *address_length_r)
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{
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int ret;
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socklen_t address_length = *address_length_r;
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#ifdef HAVE_ACCEPT4
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ret = accept4(fd, address, &address_length,
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SOCK_CLOEXEC|SOCK_NONBLOCK);
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if (ret >= 0 || errno != ENOSYS) {
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if (ret >= 0)
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*address_length_r = address_length;
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return ret;
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}
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#endif
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ret = accept(fd, address, &address_length);
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if (ret >= 0) {
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fd_set_cloexec(ret, true);
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fd_set_nonblock(ret);
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*address_length_r = address_length;
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}
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return ret;
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}
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#ifndef WIN32
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ssize_t
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recvmsg_cloexec(int sockfd, struct msghdr *msg, int flags)
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{
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#ifdef MSG_CMSG_CLOEXEC
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flags |= MSG_CMSG_CLOEXEC;
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#endif
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ssize_t result = recvmsg(sockfd, msg, flags);
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if (result >= 0) {
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struct cmsghdr *cmsg = CMSG_FIRSTHDR(msg);
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while (cmsg != NULL) {
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if (cmsg->cmsg_type == SCM_RIGHTS) {
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const int *fd_p = (const int *)CMSG_DATA(cmsg);
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fd_set_cloexec(*fd_p, true);
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}
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cmsg = CMSG_NXTHDR(msg, cmsg);
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}
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}
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return result;
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}
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#endif
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#ifdef HAVE_INOTIFY_INIT
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int
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inotify_init_cloexec(void)
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{
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int fd;
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#ifdef HAVE_INOTIFY_INIT1
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fd = inotify_init1(IN_CLOEXEC);
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if (fd >= 0 || errno != ENOSYS)
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return fd;
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#endif
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fd = inotify_init();
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if (fd >= 0)
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fd_set_cloexec(fd, true);
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return fd;
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}
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#endif
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#ifdef USE_EVENTFD
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int
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eventfd_cloexec_nonblock(unsigned initval, int flags)
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{
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return eventfd(initval, flags | EFD_CLOEXEC | EFD_NONBLOCK);
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}
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#endif
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int
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close_socket(int fd)
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{
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#ifdef WIN32
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return closesocket(fd);
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#else
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return close(fd);
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#endif
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}
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