Makefile.am: move sources to libsystem.a

src/system/fd_util.c

@@ -0,0 +1,353 @@
+/*
+ * Copyright (C) 2003-2011 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
+
+#ifdef USE_EVENTFD
+#include <sys/eventfd.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
+dup_cloexec(int oldfd)
+{
+	int newfd = dup(oldfd);
+	if (newfd >= 0)
+		fd_set_nonblock(newfd);
+
+	return newfd;
+}
+
+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
+}
+
+#ifndef WIN32
+
+int
+socketpair_cloexec(int domain, int type, int protocol, int sv[2])
+{
+	int ret;
+
+#ifdef SOCK_CLOEXEC
+	ret = socketpair(domain, type | SOCK_CLOEXEC, protocol, sv);
+	if (ret >= 0 || errno != EINVAL)
+		return ret;
+#endif
+
+	ret = socketpair(domain, type, protocol, sv);
+	if (ret >= 0) {
+		fd_set_cloexec(sv[0], true);
+		fd_set_cloexec(sv[1], true);
+	}
+
+	return ret;
+}
+
+int
+socketpair_cloexec_nonblock(int domain, int type, int protocol, int sv[2])
+{
+	int ret;
+
+#if defined(SOCK_CLOEXEC) && defined(SOCK_NONBLOCK)
+	ret = socketpair(domain, type | SOCK_CLOEXEC | SOCK_NONBLOCK, protocol,
+			 sv);
+	if (ret >= 0 || errno != EINVAL)
+		return ret;
+#endif
+
+	ret = socketpair(domain, type, protocol, sv);
+	if (ret >= 0) {
+		fd_set_cloexec(sv[0], true);
+		fd_set_nonblock(sv[0]);
+		fd_set_cloexec(sv[1], true);
+		fd_set_nonblock(sv[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;
+}
+
+#ifndef WIN32
+
+ssize_t
+recvmsg_cloexec(int sockfd, struct msghdr *msg, int flags)
+{
+#ifdef MSG_CMSG_CLOEXEC
+	flags |= MSG_CMSG_CLOEXEC;
+#endif
+
+	ssize_t result = recvmsg(sockfd, msg, flags);
+	if (result >= 0) {
+		struct cmsghdr *cmsg = CMSG_FIRSTHDR(msg);
+		while (cmsg != NULL) {
+			if (cmsg->cmsg_type == SCM_RIGHTS) {
+				const int *fd_p = (const int *)CMSG_DATA(cmsg);
+				fd_set_cloexec(*fd_p, true);
+			}
+
+			cmsg = CMSG_NXTHDR(msg, cmsg);
+		}
+	}
+
+	return result;
+}
+
+#endif
+
+#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
+
+#ifdef USE_EVENTFD
+
+int
+eventfd_cloexec_nonblock(unsigned initval, int flags)
+{
+	return eventfd(initval, flags | EFD_CLOEXEC | EFD_NONBLOCK);
+}
+
+#endif
+
+int
+close_socket(int fd)
+{
+#ifdef WIN32
+	return closesocket(fd);
+#else
+	return close(fd);
+#endif
+}