compositor: work around missing SOCK_CLOEXEC

Android does not have SOCK_CLOEXEC, so implement a wrapper that falls
back.

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>

shared/Makefile.am

@@ -9,5 +9,7 @@ libshared_la_SOURCES =				\
 	option-parser.c				\
 	image-loader.c				\
 	config-parser.h				\
+	os-compatibility.c			\
+	os-compatibility.h			\
 	cairo-util.c				\
 	cairo-util.h

shared/os-compatibility.c

@@ -0,0 +1,78 @@
+/*
+ * Copyright © 2012 Collabora, Ltd.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "os-compatibility.h"
+
+static int
+set_cloexec_or_close(int fd)
+{
+	long flags;
+
+	if (fd == -1)
+		return -1;
+
+	flags = fcntl(fd, F_GETFD);
+	if (flags == -1)
+		goto err;
+
+	if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1)
+		goto err;
+
+	return fd;
+
+err:
+	close(fd);
+	return -1;
+}
+
+int
+os_socketpair_cloexec(int domain, int type, int protocol, int *sv)
+{
+	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)
+		return ret;
+
+	sv[0] = set_cloexec_or_close(sv[0]);
+	sv[1] = set_cloexec_or_close(sv[1]);
+
+	if (sv[0] != -1 && sv[1] != -1)
+		return 0;
+
+	close(sv[0]);
+	close(sv[1]);
+	return -1;
+}
+

shared/os-compatibility.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright © 2012 Collabora, Ltd.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#ifndef OS_COMPATIBILITY_H
+#define OS_COMPATIBILITY_H
+
+int
+os_socketpair_cloexec(int domain, int type, int protocol, int *sv);
+
+#endif /* OS_COMPATIBILITY_H */

src/compositor.c

@@ -35,9 +35,7 @@
 #include <assert.h>
 #include <sys/ioctl.h>
 #include <sys/wait.h>
-#include <sys/types.h>
 #include <sys/socket.h>
-#include <fcntl.h>
 #include <unistd.h>
 #include <math.h>
 #include <linux/input.h>
@@ -48,6 +46,7 @@
 
 #include <wayland-server.h>
 #include "compositor.h"
+#include "../shared/os-compatibility.h"
 
 static struct wl_list child_process_list;
 static jmp_buf segv_jmp_buf;
@@ -134,7 +133,7 @@ weston_client_launch(struct weston_compositor *compositor,
 	pid_t pid;
 	struct wl_client *client;
 
-	if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sv) < 0) {
+	if (os_socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0, sv) < 0) {
 		fprintf(stderr, "weston_client_launch: "
 			"socketpair failed while launching '%s': %m\n",
 			path);