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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Mon, 30 Jan 2012 20:00:29 +0000 (UTC)
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Subject: svn commit: r230785 - head/sys/kern
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Author: kib
Date: Mon Jan 30 20:00:29 2012
New Revision: 230785
URL: http://svn.freebsd.org/changeset/base/230785

Log:
  A debugger which requested PT_FOLLOW_FORK should get the notification
  about new child not only when doing PT_TO_SCX, but also for PT_CONTINUE.
  If TDB_FORK flag is set, always issue a stop, the same as is done for
  TDB_EXEC.
  
  Reported by:	Dmitry Mikulin <dmitrym juniper net>
  MFC after:	1 week

Modified:
  head/sys/kern/subr_syscall.c

Modified: head/sys/kern/subr_syscall.c
==============================================================================
--- head/sys/kern/subr_syscall.c	Mon Jan 30 19:52:17 2012	(r230784)
+++ head/sys/kern/subr_syscall.c	Mon Jan 30 20:00:29 2012	(r230785)
@@ -212,7 +212,8 @@ syscallret(struct thread *td, int error,
 		 * executes.  If debugger requested tracing of syscall
 		 * returns, do it now too.
 		 */
-		if (traced && ((td->td_dbgflags & TDB_EXEC) != 0 ||
+		if (traced &&
+		    ((td->td_dbgflags & (TDB_FORK | TDB_EXEC)) != 0 ||
 		    (p->p_stops & S_PT_SCX) != 0))
 			ptracestop(td, SIGTRAP);
 		td->td_dbgflags &= ~(TDB_SCX | TDB_EXEC | TDB_FORK);