commit 23a9967121cd2e7ead33dc7ccdeac7d8be2855c8
from: Omar Polo <op@omarpolo.com>
date: Sun Oct 08 19:11:45 2023 UTC

(cont) work around lack of SOCK_{CLOEXEC,NONBLOCK}

funny how they're trying to deprecate daemon() in favour of the
mess of posix_spawn and still don't provide genuinely useful stuff
like SOCK_CLOEXEC, NONBLOCK and pipe2(2).

commit - 1738062c340fe8420ec57741ef1f53fd7a1a3904
commit + 23a9967121cd2e7ead33dc7ccdeac7d8be2855c8
blob - 71b8cc38bc317ae9fe20972282bf0dcc0f84f350
blob + dfecb8c2146a1d26235b34e947cac4aadec6e160
--- control.c
+++ control.c
@@ -135,14 +135,13 @@ control_listen(int fd)
 void
 control_accept(int listenfd, int event, void *bula)
 {
-	int			 connfd;
+	int			 connfd, flags;
 	socklen_t		 len;
 	struct sockaddr_un	 sun;
 	struct ctl_conn		*c;
 
 	len = sizeof(sun);
-	if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
-	    SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) {
+	if ((connfd = accept(listenfd, (struct sockaddr *)&sun, &len)) == -1) {
 		/*
 		 * Pause accept if we are out of file descriptors, or
 		 * libevent will haunt us here too.
@@ -158,6 +157,12 @@ control_accept(int listenfd, int event, void *bula)
 		return;
 	}
 
+	if ((flags = fcntl(connfd, F_GETFL)) == -1 ||
+	    fcntl(connfd, F_SETFL, flags | O_NONBLOCK) == -1)
+		fatal("fcntl(O_NONBLOCK)");
+	if (fcntl(connfd, F_SETFD, FD_CLOEXEC) == -1)
+		fatal("fcntl(CLOEXEC)");
+
 	if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
 		log_warn("%s: calloc", __func__);
 		close(connfd);