134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
/*
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* Copyright 2003-2017 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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#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 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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assert(fd >= 0);
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const int old_flags = fcntl(fd, F_GETFD, 0);
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if (old_flags < 0)
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return old_flags;
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const int new_flags = (old_flags & and_mask) ^ xor_mask;
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if (new_flags == old_flags)
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return old_flags;
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return fcntl(fd, F_SETFD, new_flags);
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}
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#endif /* !WIN32 */
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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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#ifndef WIN32
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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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#endif
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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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