Rewrite poll loop a bit. Put the various message queues into an array

with the same order as the pollfds. This way simple for loops can be
used to setup and handle all cases but POLLIN.
OK tb@

1 files changed, 28 insertions, 44 deletions

diff --git a/usr.sbin/rpki-client/main.c b/usr.sbin/rpki-client/main.c
index 70b7c6526aa..3d88e299d88 100644
--- a/usr.sbin/rpki-client/main.c
+++ b/usr.sbin/rpki-client/main.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: main.c,v 1.123 2021/03/25 12:18:45 claudio Exp $ */
+/*	$OpenBSD: main.c,v 1.124 2021/03/26 10:01:51 claudio Exp $ */
 /*
  * Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv>
  *
@@ -837,6 +837,8 @@ suicide(int sig __attribute__((unused)))
 
 }
 
+#define NPFD	3
+
 int
 main(int argc, char *argv[])
 {
@@ -845,7 +847,8 @@ main(int argc, char *argv[])
 	size_t		 i, id, outsz = 0, talsz = 0;
 	pid_t		 procpid, rsyncpid, httppid;
 	int		 fd[2];
-	struct pollfd	 pfd[3];
+	struct pollfd	 pfd[NPFD];
+	struct msgbuf	*queues[NPFD];
 	struct roa	**out = NULL;
 	struct repo	*rp;
 	char		*rsync_prog = "openrsync";
@@ -1079,8 +1082,11 @@ main(int argc, char *argv[])
 	 */
 
 	pfd[0].fd = rsync;
+	queues[0] = &rsyncq;
 	pfd[1].fd = proc;
+	queues[1] = &procq;
 	pfd[2].fd = http;
+	queues[2] = &httpq;
 
 	/*
 	 * Prime the process with our TAL file.
@@ -1096,53 +1102,31 @@ main(int argc, char *argv[])
 		err(1, "fchdir");
 
 	while (entity_queue > 0 && !killme) {
-		pfd[0].events = POLLIN;
-		if (rsyncq.queued)
-			pfd[0].events |= POLLOUT;
-		pfd[1].events = POLLIN;
-		if (procq.queued)
-			pfd[1].events |= POLLOUT;
-		pfd[2].events = POLLIN;
-		if (httpq.queued)
-			pfd[2].events |= POLLOUT;
-
-		if ((c = poll(pfd, 3, INFTIM)) == -1) {
+		for (i = 0; i < NPFD; i++) {
+			pfd[i].events = POLLIN;
+			if (queues[i]->queued)
+				pfd[i].events |= POLLOUT;
+		}
+
+		if ((c = poll(pfd, NPFD, INFTIM)) == -1) {
 			if (errno == EINTR)
 				continue;
 			err(1, "poll");
 		}
 
-		if ((pfd[0].revents & (POLLERR|POLLNVAL)) ||
-		    (pfd[1].revents & (POLLERR|POLLNVAL)) ||
-		    (pfd[2].revents & (POLLERR|POLLNVAL)))
-			errx(1, "poll: bad fd");
-		if ((pfd[0].revents & POLLHUP) ||
-		    (pfd[1].revents & POLLHUP) ||
-		    (pfd[2].revents & POLLHUP))
-			errx(1, "poll: hangup");
-
-		if (pfd[0].revents & POLLOUT) {
-			switch (msgbuf_write(&rsyncq)) {
-			case 0:
-				errx(1, "write: connection closed");
-			case -1:
-				err(1, "write");
-			}
-		}
-		if (pfd[1].revents & POLLOUT) {
-			switch (msgbuf_write(&procq)) {
-			case 0:
-				errx(1, "write: connection closed");
-			case -1:
-				err(1, "write");
-			}
-		}
-		if (pfd[2].revents & POLLOUT) {
-			switch (msgbuf_write(&httpq)) {
-			case 0:
-				errx(1, "write: connection closed");
-			case -1:
-				err(1, "write");
+		for (i = 0; i < NPFD; i++) {
+			if (pfd[i].revents & (POLLERR|POLLNVAL))
+				errx(1, "poll[%zu]: bad fd", i);
+			if (pfd[i].revents & POLLHUP)
+				errx(1, "poll[%zu]: hangup", i);
+			if (pfd[i].revents & POLLOUT) {
+				switch (msgbuf_write(queues[i])) {
+				case 0:
+					errx(1, "write[%zu]: "
+					    "connection closed", i);
+				case -1:
+					err(1, "write[%zu]", i);
+				}
 			}
 		}