fd_util: added O_NONBLOCK functions

Changed the wrappers for pipe(), socket(), accept().  On WIN32, this
does not work for pipe().

src/event_pipe.c

@@ -18,7 +18,6 @@
  */
 
 #include "event_pipe.h"
-#include "utils.h"
 #include "fd_util.h"
 
 #include <stdbool.h>
@@ -85,13 +84,9 @@ void event_pipe_init(void)
 	GIOChannel *channel;
 	int ret;
 
-	ret = pipe_cloexec(event_pipe);
+	ret = pipe_cloexec_nonblock(event_pipe);
 	if (ret < 0)
 		g_error("Couldn't open pipe: %s", strerror(errno));
-#ifndef WIN32
-	if (set_nonblocking(event_pipe[1]) < 0)
-		g_error("Couldn't set non-blocking I/O: %s", strerror(errno));
-#endif
 
 	channel = g_io_channel_unix_new(event_pipe[0]);
 	event_pipe_source_id = g_io_add_watch(channel, G_IO_IN,

src/fd_util.c

@@ -68,6 +68,29 @@ fd_set_cloexec(int fd, bool enable)
 #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)
 {
@@ -108,7 +131,7 @@ creat_cloexec(const char *path_fs, int mode)
 }
 
 int
-pipe_cloexec(int fd[2])
+pipe_cloexec_nonblock(int fd[2])
 {
 #ifdef WIN32
 	return _pipe(event_pipe, 512, _O_BINARY);
@@ -116,7 +139,7 @@ pipe_cloexec(int fd[2])
 	int ret;
 
 #ifdef HAVE_PIPE2
-	ret = pipe2(fd, O_CLOEXEC);
+	ret = pipe2(fd, O_CLOEXEC|O_NONBLOCK);
 	if (ret >= 0 || errno != ENOSYS)
 		return ret;
 #endif
@@ -125,6 +148,11 @@ pipe_cloexec(int fd[2])
 	if (ret >= 0) {
 		fd_set_cloexec(fd[0], true);
 		fd_set_cloexec(fd[1], true);
+
+#ifndef WIN32
+		fd_set_nonblock(fd[0]);
+		fd_set_nonblock(fd[1]);
+#endif
 	}
 
 	return ret;
@@ -132,12 +160,12 @@ pipe_cloexec(int fd[2])
 }
 
 int
-socket_cloexec(int domain, int type, int protocol)
+socket_cloexec_nonblock(int domain, int type, int protocol)
 {
 	int fd;
 
-#ifdef SOCK_CLOEXEC
-	fd = socket(domain, type | SOCK_CLOEXEC, protocol);
+#if defined(SOCK_CLOEXEC) && defined(SOCK_NONBLOCK)
+	fd = socket(domain, type | SOCK_CLOEXEC | SOCK_NONBLOCK, protocol);
 	if (fd >= 0 || errno != EINVAL)
 		return fd;
 #endif
@@ -150,13 +178,15 @@ socket_cloexec(int domain, int type, int protocol)
 }
 
 int
-accept_cloexec(int fd, struct sockaddr *address, size_t *address_length_r)
+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);
+	ret = accept4(fd, address, &address_length,
+		      SOCK_CLOEXEC|SOCK_NONBLOCK);
 	if (ret >= 0 || errno != ENOSYS) {
 		if (ret >= 0)
 			*address_length_r = address_length;
@@ -168,6 +198,7 @@ accept_cloexec(int fd, struct sockaddr *address, size_t *address_length_r)
 	ret = accept(fd, address, &address_length);
 	if (ret >= 0) {
 		fd_set_cloexec(ret, true);
+		fd_set_nonblock(ret);
 		*address_length_r = address_length;
 	}
 

src/fd_util.h

@@ -49,23 +49,27 @@ creat_cloexec(const char *path_fs, int mode);
 /**
  * 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(int fd[2]);
+pipe_cloexec_nonblock(int fd[2]);
 
 /**
- * Wrapper for socket(), which sets the CLOEXEC flag (atomically if
- * supported by the OS).
+ * Wrapper for socket(), which sets the CLOEXEC and the NONBLOCK flag
+ * (atomically if supported by the OS).
  */
 int
-socket_cloexec(int domain, int type, int protocol);
+socket_cloexec_nonblock(int domain, int type, int protocol);
 
 /**
- * Wrapper for accept(), which sets the CLOEXEC flag (atomically if
- * supported by the OS).
+ * Wrapper for accept(), which sets the CLOEXEC and the NONBLOCK flags
+ * (atomically if supported by the OS).
  */
 int
-accept_cloexec(int fd, struct sockaddr *address, size_t *address_length_r);
+accept_cloexec_nonblock(int fd, struct sockaddr *address,
+			size_t *address_length_r);
 
 /**
  * Wrapper for inotify_init(), which sets the CLOEXEC flag (atomically

src/listen.c

@@ -21,7 +21,6 @@
 #include "socket_util.h"
 #include "client.h"
 #include "conf.h"
-#include "utils.h"
 #include "fd_util.h"
 #include "config.h"
 
@@ -429,10 +428,9 @@ listen_in_event(G_GNUC_UNUSED GIOChannel *source,
 	struct sockaddr_storage sa;
 	size_t sa_length = sizeof(sa);
 
-	fd = accept_cloexec(listen_fd, (struct sockaddr*)&sa, &sa_length);
+	fd = accept_cloexec_nonblock(listen_fd, (struct sockaddr*)&sa,
+				     &sa_length);
 	if (fd >= 0) {
-		set_nonblocking(fd);
-
 		client_new(fd, (struct sockaddr*)&sa, sa_length,
 			   get_remote_uid(fd));
 	} else if (fd < 0 && errno != EINTR) {

src/output/httpd_output_plugin.c

@@ -195,7 +195,8 @@ httpd_listen_in_event(G_GNUC_UNUSED GIOChannel *source,
 	/* the listener socket has become readable - a client has
 	   connected */
 
-	fd = accept_cloexec(httpd->fd, (struct sockaddr*)&sa, &sa_length);
+	fd = accept_cloexec_nonblock(httpd->fd, (struct sockaddr*)&sa,
+				     &sa_length);
 	if (fd >= 0) {
 		/* can we allow additional client */
 		if (httpd->open &&

src/socket_util.c

@@ -103,7 +103,7 @@ socket_bind_listen(int domain, int type, int protocol,
 	int passcred = 1;
 #endif
 
-	fd = socket_cloexec(domain, type, protocol);
+	fd = socket_cloexec_nonblock(domain, type, protocol);
 	if (fd < 0) {
 		g_set_error(error, listen_quark(), errno,
 			    "Failed to create socket: %s", g_strerror(errno));