From: David van Moolenbroek <david@minix3.org>
Date: Wed, 13 May 2009 21:58:10 +0000 (+0000)
Subject: Clear trace bit for child on fork.
X-Git-Tag: v3.1.4~33
X-Git-Url: http://zhaoyanbai.com/repos/doc/%20%22?a=commitdiff_plain;h=c2aef85edabaf9009e9cd9f7d0ad4fcaba07c49f;p=minix.git

Clear trace bit for child on fork.

Without this, a forking single-stepped process will have its child
die from a TRAP signal right away.
---

diff --git a/kernel/system/do_fork.c b/kernel/system/do_fork.c
index 7e6b30388..a365ab77a 100644
--- a/kernel/system/do_fork.c
+++ b/kernel/system/do_fork.c
@@ -55,6 +55,8 @@ register message *m_ptr;	/* pointer to request message */
   rpc->p_user_time = 0;		/* set all the accounting times to 0 */
   rpc->p_sys_time = 0;
 
+  rpc->p_reg.psw &= ~TRACEBIT;		/* clear trace bit */
+
   /* Parent and child have to share the quantum that the forked process had,
    * so that queued processes do not have to wait longer because of the fork.
    * If the time left is odd, the child gets an extra tick.