When 'w' finds an IP address in the ut_host field, it attempts to do

a gethostbyname() on it.  That can take a long time...  (especially
if the reason the IP address is in there in the first place is because
login/rlogind/telnetd couldn't find it either....)
This patch reduces the gethostbyaddr lookup time to 2 seconds, the idea being
that if the local nameserver knows the answer, it'll answer within that time,
otherwise we dont care... :-)
This change doesn't do anything about whether or not w should do this in the
first place, but at least it will make the current behavior less painful.
Reviewed by:	David Greenman

1 files changed, 8 insertions, 0 deletions

diff --git a/usr.bin/w/w.c b/usr.bin/w/w.c
index 685057d..6e006ad 100644
--- a/usr.bin/w/w.c
+++ b/usr.bin/w/w.c
@@ -77,6 +77,9 @@ static char sccsid[] = "@(#)w.c	8.4 (Berkeley) 4/16/94";
 #include <utmp.h>
 #include <vis.h>
 
+#include <arpa/nameser.h>
+#include <resolv.h>
+
 #include "extern.h"
 
 struct timeval	boottime;
@@ -169,6 +172,11 @@ main(argc, argv)
 	argc -= optind;
 	argv += optind;
 
+	if (!(_res.options & RES_INIT))
+		res_init();
+	_res.retrans = 2;	/* resolver timeout to 2 seconds per try */
+	_res.retry = 1;		/* only try once.. */
+
 	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
 		errx(1, "%s", errbuf);