Date: Sun, 10 Nov 2002 18:08:32 +0100 (CET) From: Pawel Worach <sajd@telia.com> To: FreeBSD-gnats-submit@FreeBSD.org Subject: bin/45193: [PATCH] truss can't truss itself Message-ID: <200211101708.gAAH8WVX002184@darkstar.sajd.net>
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>Number: 45193
>Category: bin
>Synopsis: [PATCH] truss can't truss itself
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Nov 10 09:10:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Pawel Worach <sajd@telia.com>
>Release: FreeBSD 4.7-STABLE i386
>Organization:
>Environment:
System: FreeBSD darkstar 4.7-STABLE FreeBSD 4.7-STABLE #0: Sat Nov 9 17:10:55 CET 2002 root@darkstar:/usr/obj/usr/src/sys/DARKSTAR i386
>Description:
If you try to truss the truss process with itself it will deadlock
like truss -p <next pid>
>How-To-Repeat:
Figure out the next pid number (using top for example) then run truss -p <pid>
that will make truss trace itself without any result.
>Fix:
Patch for $FreeBSD: src/usr.bin/truss/main.c,v 1.15.2.3 2002/05/16 23:41:23 peter Exp $
(this is what it does on SunOS)
--- main.c.orig Fri May 17 01:41:23 2002
+++ main.c Sun Nov 10 16:44:40 2002
@@ -144,6 +144,10 @@
switch (c) {
case 'p': /* specified pid */
pid = atoi(optarg);
+ if(pid == getpid()) { /* make sure i don't trace me */
+ fprintf(stderr, "truss: attempt to grab self: %d\n", pid);
+ exit(2);
+ }
break;
case 'o': /* Specified output file */
fname = optarg;
>Release-Note:
>Audit-Trail:
>Unformatted:
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