libseat: Use SOCK_CLOEXEC and SOCK_NONBLOCK

This both simplifies our code and fixes an exec fd leak when using
builtin or noop backends.

2 files changed, 3 insertions, 19 deletions

diff --git a/libseat/backend/noop.c b/libseat/backend/noop.c
index 7436c48..f69aac6 100644
--- a/libseat/backend/noop.c
+++ b/libseat/backend/noop.c
@@ -109,7 +109,7 @@ static struct libseat *noop_open_seat(const struct libseat_seat_listener *listen
 		return NULL;
 	}
 
-	if (socketpair(AF_UNIX, SOCK_STREAM, 0, backend->sockets) != 0) {
+	if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, backend->sockets) != 0) {
 		log_errorf("socketpair() failed: %s", strerror(errno));
 		free(backend);
 		return NULL;
diff --git a/libseat/backend/seatd.c b/libseat/backend/seatd.c
index 26308d1..6e90713 100644
--- a/libseat/backend/seatd.c
+++ b/libseat/backend/seatd.c
@@ -42,32 +42,16 @@ struct backend_seatd {
 	char seat_name[MAX_SEAT_LEN];
 };
 
-static int set_nonblock(int fd) {
-	int flags;
-	if ((flags = fcntl(fd, F_GETFD)) == -1 || fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) {
-		return -1;
-	}
-	if ((flags = fcntl(fd, F_GETFL)) == -1 || fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
-		return -1;
-	}
-	return 0;
-}
-
 static int seatd_connect(void) {
 	union {
 		struct sockaddr_un unix;
 		struct sockaddr generic;
 	} addr = {{0}};
-	int fd = socket(AF_UNIX, SOCK_STREAM, 0);
+	int fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
 	if (fd == -1) {
 		log_errorf("Could not create socket: %s", strerror(errno));
 		return -1;
 	}
-	if (set_nonblock(fd) == -1) {
-		log_errorf("Could not make socket non-blocking: %s", strerror(errno));
-		close(fd);
-		return -1;
-	}
 	const char *path = getenv("SEATD_SOCK");
 	if (path == NULL) {
 		path = SEATD_DEFAULTPATH;
@@ -638,7 +622,7 @@ static int set_deathsig(int signal) {
 
 static struct libseat *builtin_open_seat(const struct libseat_seat_listener *listener, void *data) {
 	int fds[2];
-	if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == -1) {
+	if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0, fds) == -1) {
 		log_errorf("Could not create socket pair: %s", strerror(errno));
 		return NULL;
 	}