Date: Wed, 17 Sep 2008 13:57:00 GMT From: Henri Hennebert <hlh@restart.be> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/127440: Dtrace arg0/arg1 variables don't contain return value of syscall:::return Message-ID: <200809171357.m8HDv0VH008595@www.freebsd.org> Resent-Message-ID: <200809171400.m8HE0E5d081992@freefall.freebsd.org>
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>Number: 127440
>Category: kern
>Synopsis: Dtrace arg0/arg1 variables don't contain return value of syscall:::return
>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: Wed Sep 17 14:00:14 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator: Henri Hennebert
>Release: 7.1-PRERELEASE
>Organization:
>Environment:
FreeBSD morzine.restart.bel 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #0: Sun Sep 14 17:24:37 CEST 2008 root@morzine.restart.bel:/usr/obj/usr/src/sys/MORZINE i386
>Description:
I am reading the 'Solaris Dynamic tracing guide' and using FreeBSD for the practical test.
In this D program:
syscall::read:entry,
syscall::write:entry
/pid == $1/
{
printf("%s(%d, 0x%x, %4d)", probefunc, arg0, arg1, arg2);
}
syscall::read:return,
syscall::write:return
/pid == $1/
{
printf("\t\t = %d\n", arg1);
}
in syscall::read:return, syscall::write:return
argO/arg1 has respectively the value of arg0/arg1 at the corresponding syscall:::entry instead of the return value of the syscall.
Anyway, thanks for this great port
Henri
>How-To-Repeat:
running the previous D program under 7.1-PRERELEASE
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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