[src/trunk]: src/lib/libc/rpc Don't try to use listen(2) on a UDP socket whic...

[tron <tron%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e882358ba9c7
branches:  trunk
changeset: 811746:e882358ba9c7
user:      tron <tron%NetBSD.org@localhost>
date:      Fri Nov 13 11:23:08 2015 +0000

description:
Don't try to use listen(2) on a UDP socket which will always fail.
Previously this was not a problem because the return value of listen(2)
was ignored. With this fix amd(8) no longer fails to start with the
error message "cannot create rpc/udp service".

TL;DR: Make amd(8) work again

diffstat:

 lib/libc/rpc/rpc_soc.c |  13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diffs (34 lines):

diff -r ab59c78151db -r e882358ba9c7 lib/libc/rpc/rpc_soc.c
--- a/lib/libc/rpc/rpc_soc.c    Fri Nov 13 10:43:32 2015 +0000
+++ b/lib/libc/rpc/rpc_soc.c    Fri Nov 13 11:23:08 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rpc_soc.c,v 1.21 2015/11/10 20:56:20 christos Exp $    */
+/*     $NetBSD: rpc_soc.c,v 1.22 2015/11/13 11:23:08 tron Exp $        */
 
 /*
  * Copyright (c) 2010, Oracle America, Inc.
@@ -45,7 +45,7 @@
 #if 0
 static char sccsid[] = "@(#)rpc_soc.c 1.41 89/05/02 Copyr 1988 Sun Micro";
 #else
-__RCSID("$NetBSD: rpc_soc.c,v 1.21 2015/11/10 20:56:20 christos Exp $");
+__RCSID("$NetBSD: rpc_soc.c,v 1.22 2015/11/13 11:23:08 tron Exp $");
 #endif
 #endif
 
@@ -255,8 +255,13 @@
        memset(&sccsin, 0, sizeof sccsin);
        sccsin.sin_family = AF_INET;
        (void)bindresvport(fd, &sccsin);
-       if (listen(fd, SOMAXCONN) == -1)
-               goto out;
+       if (strcmp(netid, "udp") != 0 && listen(fd, SOMAXCONN) == -1) {
+               (void) syslog(LOG_ERR,
+                  "svc%s_create: listen(2) failed: %s",
+                  netid, strerror(errno));
+               (void) freenetconfigent(nconf);
+               goto out;
+       }
        svc = svc_tli_create(fd, nconf, NULL, sendsize, recvsize);
        (void) freenetconfigent(nconf);
        if (svc == NULL)