support _SC_HOST_NAME_MAX; from brad

a libc crank is happening in < 24 hours

2 files changed, 9 insertions, 3 deletions

diff --git a/lib/libc/gen/sysconf.3 b/lib/libc/gen/sysconf.3
index 74109d1cb1f..801461ee7f4 100644
--- a/lib/libc/gen/sysconf.3
+++ b/lib/libc/gen/sysconf.3
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: sysconf.3,v 1.27 2010/02/22 17:54:52 jmc Exp $
+.\"	$OpenBSD: sysconf.3,v 1.28 2010/10/28 02:06:00 deraadt Exp $
 .\"
 .\" Copyright (c) 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -27,7 +27,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: February 22 2010 $
+.Dd $Mdocdate: October 28 2010 $
 .Dt SYSCONF 3
 .Os
 .Sh NAME
@@ -172,6 +172,8 @@ The level of support for thread-safe (re-entrant) functions.
 The number of processors configured.
 .It Li _SC_NPROCESSORS_ONLN
 The number of processors online (capable of running processes).
+.It Li _SC_HOST_NAME_MAX
+The maximum size of a hostname, not counting NULL.
 .El
 .Sh RETURN VALUES
 If the call to
diff --git a/lib/libc/gen/sysconf.c b/lib/libc/gen/sysconf.c
index 97adeed047c..ce4f89a0b44 100644
--- a/lib/libc/gen/sysconf.c
+++ b/lib/libc/gen/sysconf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sysconf.c,v 1.11 2010/01/15 08:35:47 sthen Exp $ */
+/*	$OpenBSD: sysconf.c,v 1.12 2010/10/28 02:06:00 deraadt Exp $ */
 /*-
  * Copyright (c) 1993
  *	The Regents of the University of California.  All rights reserved.
@@ -214,6 +214,10 @@ yesno:		if (sysctl(mib, namelen, &value, &len, NULL, 0) == -1)
 		namelen = 3;
 		break;
 
+/* Unsorted */
+	case _SC_HOST_NAME_MAX:
+		return (MAXHOSTNAMELEN - 1); /* does not include \0 */
+
 /* Extensions */
 	case _SC_PHYS_PAGES:
 	{