from sthen: handle msgbuf_write() returning EAGAIN

ok krw

src/usr.sbin/ntpd/control.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: control.c,v 1.1 2013/10/04 14:28:16 phessler Exp $ */
+/*	$OpenBSD: control.c,v 1.2 2013/11/13 20:44:39 benno Exp $ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -184,7 +184,7 @@ control_dispatch_msg(struct pollfd *pfd, u_int *ctl_cnt)
 	}
 
 	if (pfd->revents & POLLOUT)
-		if (msgbuf_write(&c->ibuf.w) < 0) {
+		if (msgbuf_write(&c->ibuf.w) <= 0 && errno != EAGAIN) {
 			*ctl_cnt -= control_close(pfd->fd);
 			return (1);
 		}

src/usr.sbin/ntpd/ntp.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: ntp.c,v 1.119 2013/10/04 14:28:16 phessler Exp $ */
+/*	$OpenBSD: ntp.c,v 1.120 2013/11/13 20:44:39 benno Exp $ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -335,7 +335,8 @@ ntp_main(int pipe_prnt[2], int fd_ctl, struct ntpd_conf *nconf,
 			}
 
 		if (nfds > 0 && (pfd[PFD_PIPE_MAIN].revents & POLLOUT))
-			if (msgbuf_write(&ibuf_main->w) < 0) {
+			if (msgbuf_write(&ibuf_main->w) <= 0 &&
+			    errno != EAGAIN) {
 				log_warn("pipe write error (to parent)");
 				ntp_quit = 1;
 			}
@@ -347,7 +348,8 @@ ntp_main(int pipe_prnt[2], int fd_ctl, struct ntpd_conf *nconf,
 		}
 
 		if (nfds > 0 && (pfd[PFD_PIPE_DNS].revents & POLLOUT))
-			if (msgbuf_write(&ibuf_dns->w) < 0) {
+			if (msgbuf_write(&ibuf_dns->w) <= 0 &&
+			    errno != EAGAIN) {
 				log_warn("pipe write error (to dns engine)");
 				ntp_quit = 1;
 			}

src/usr.sbin/ntpd/ntp_dns.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: ntp_dns.c,v 1.3 2010/05/26 13:56:08 nicm Exp $ */
+/*	$OpenBSD: ntp_dns.c,v 1.4 2013/11/13 20:44:39 benno Exp $ */
 
 /*
  * Copyright (c) 2003-2008 Henning Brauer <henning@openbsd.org>
@@ -97,7 +97,8 @@ ntp_dns(int pipe_ntp[2], struct ntpd_conf *nconf, struct passwd *pw)
 			}
 
 		if (nfds > 0 && (pfd[0].revents & POLLOUT))
-			if (msgbuf_write(&ibuf_dns->w) < 0) {
+			if (msgbuf_write(&ibuf_dns->w) <= 0 &&
+			    errno != EAGAIN) {
 				log_warn("pipe write error (to ntp engine)");
 				quit_dns = 1;
 			}

src/usr.sbin/ntpd/ntpd.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: ntpd.c,v 1.74 2013/10/16 21:23:59 jmc Exp $ */
+/*	$OpenBSD: ntpd.c,v 1.75 2013/11/13 20:44:39 benno Exp $ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -217,7 +217,7 @@ main(int argc, char *argv[])
 		}
 
 		if (nfds > 0 && (pfd[PFD_PIPE].revents & POLLOUT))
-			if (msgbuf_write(&ibuf->w) < 0) {
+			if (msgbuf_write(&ibuf->w) <= 0 && errno != EAGAIN) {
 				log_warn("pipe write error (to child)");
 				quit = 1;
 			}
@@ -597,7 +597,7 @@ ctl_main(int argc, char *argv[])
 	}
 
 	while (ibuf_ctl->w.queued)
-		if (msgbuf_write(&ibuf_ctl->w) < 0)
+		if (msgbuf_write(&ibuf_ctl->w) <= 0 && errno != EAGAIN)
 			err(1, "ibuf_ctl: msgbuf_write error");
 
 	done = 0;