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-rw-r--r--src/fd_util.c245
1 files changed, 245 insertions, 0 deletions
diff --git a/src/fd_util.c b/src/fd_util.c
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--- /dev/null
+++ b/src/fd_util.c
@@ -0,0 +1,245 @@
+/*
+ * Copyright (C) 2003-2010 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.
+ */
+
+#include "config.h" /* must be first for large file support */
+#include "fd_util.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 <ws2tcpip.h>
+#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;
+
+ return 0;
+#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 mode)
+{
+ int fd;
+
+#ifdef O_CLOEXEC
+ flags |= O_CLOEXEC;
+#endif
+
+#ifdef O_NOCTTY
+ flags |= O_NOCTTY;
+#endif
+
+ fd = open(path_fs, flags, mode);
+ if (fd >= 0)
+ fd_set_cloexec(fd, true);
+
+ return fd;
+}
+
+int
+pipe_cloexec(int fd[2])
+{
+#ifdef WIN32
+ return _pipe(fd, 512, _O_BINARY);
+#else
+ int ret;
+
+#ifdef HAVE_PIPE2
+ ret = pipe2(fd, O_CLOEXEC);
+ 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);
+ }
+
+ return ret;
+#endif
+}
+
+int
+pipe_cloexec_nonblock(int fd[2])
+{
+#ifdef WIN32
+ return _pipe(fd, 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);
+
+ fd_set_nonblock(fd[0]);
+ fd_set_nonblock(fd[1]);
+ }
+
+ 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);
+ fd_set_nonblock(fd);
+ }
+
+ 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