[src/trunk]: src/bin/ps Don't print junk errnos. Avoids:

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

details:   https://anonhg.NetBSD.org/src/rev/9369ca6af748
branches:  trunk
changeset: 796954:9369ca6af748
user:      dholland <dholland%NetBSD.org@localhost>
date:      Sat Jun 28 17:32:27 2014 +0000

description:
Don't print junk errnos. Avoids:
  % ps -tfoo
  ps: /dev/ttyfoo: Undefined error: 0
  Exit 1

diffstat:

 bin/ps/ps.c |  10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diffs (39 lines):

diff -r 5be5a2677cd7 -r 9369ca6af748 bin/ps/ps.c
--- a/bin/ps/ps.c       Sat Jun 28 15:52:45 2014 +0000
+++ b/bin/ps/ps.c       Sat Jun 28 17:32:27 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ps.c,v 1.81 2014/04/20 23:31:40 dholland Exp $ */
+/*     $NetBSD: ps.c,v 1.82 2014/06/28 17:32:27 dholland Exp $ */
 
 /*
  * Copyright (c) 2000-2008 The NetBSD Foundation, Inc.
@@ -68,7 +68,7 @@
 #if 0
 static char sccsid[] = "@(#)ps.c       8.4 (Berkeley) 4/2/94";
 #else
-__RCSID("$NetBSD: ps.c,v 1.81 2014/04/20 23:31:40 dholland Exp $");
+__RCSID("$NetBSD: ps.c,v 1.82 2014/06/28 17:32:27 dholland Exp $");
 #endif
 #endif /* not lint */
 
@@ -175,8 +175,11 @@
                ttypath = ttname;
        *what = KERN_PROC_TTY;
        if (stat(ttypath, &sb) == -1) {
-               devmajor_t pts = getdevmajor("pts", S_IFCHR);
+               devmajor_t pts;
+               int serrno;
 
+               serrno = errno;
+               pts = getdevmajor("pts", S_IFCHR);
                if (pts != NODEVMAJOR && strncmp(ttname, "pts/", 4) == 0) {
                        int ptsminor = atoi(ttname + 4);
 
@@ -184,6 +187,7 @@
                        if (strcmp(pathbuf, ttname) == 0 && ptsminor >= 0)
                                return makedev(pts, ptsminor);
                }
+               errno = serrno;
                err(1, "%s", ttypath);
        }
        if (!S_ISCHR(sb.st_mode))