Bug 5459

Summary:	ftrace doesn't seem to trace subprocesses
Product:	frysk	Reporter:	Tom Tromey <tromey>
Component:	general	Assignee:	Petr Machata <pmachata>
Status:	ASSIGNED ---
Severity:	normal
Priority:	P2
Version:	unspecified
Target Milestone:	---
Host:		Target:
Build:		Last reconfirmed:
Bug Depends on:	1583
Bug Blocks:	2245

Description Tom Tromey 2007-12-09 01:46:23 UTC

I checked out and built frysk yesterday, on x86 FC-6.

I tried "ftrace -c -- gcc -c r.c".
I expected to see syscalls from both the gcc driver and from cc1.
However, I only see syscalls from gcc.

Toward the end I do see the vfork clearly return the pid of the
child process:

25882.25882  syscall vfork()r.c: In function &#8216;f2&#8217;:
r.c:16: error: invalid use of undefined type &#8216;struct s&#8217;
 = 25883

(Some of that output is from cc1, ignore it)

Comment 1 Petr Machata 2007-12-09 19:13:46 UTC

Confirmed.  Test suite passes and following gcc children doesn't work.  I'll
have a look at this.

Comment 2 Petr Machata 2007-12-10 13:48:23 UTC

The problem is that frysk doesn't seem to handle vfork.  I've opened a bug 5466
that tracks this problem.  Once it is resolved somehow, I'll have to adapt
ftrace to that solution, if necessary, so I'm leaving this open.

Comment 3 Tom Tromey 2008-03-30 16:10:12 UTC

-c seems to be gone -- replaced by -f (though it is a duplicate, I
filed a separate PR).  However, this still is not working.
I changed the Summary.