Author: obrien
Date: Fri Jun 17 21:44:13 2011
New Revision: 223212
URL: http://svn.freebsd.org/changeset/base/223212
Log:
Add comment from CSRG rev 7.27 (1992/06/23 19:56:55; author: mckusick)
Modified:
head/sys/kern/sys_process.c
Modified: head/sys/kern/sys_process.c
==============================================================================
--- head/sys/kern/sys_process.c Fri Jun 17 21:41:06 2011 (r223211)
+++ head/sys/kern/sys_process.c Fri Jun 17 21:44:13 2011 (r223212)
@@ -829,6 +829,15 @@ kern_ptrace(struct thread *td, int req,
case PT_ATTACH:
/* security check done above */
+ /*
+ * It would be nice if the tracing relationship was separate
+ * from the parent relationship but that would require
+ * another set of links in the proc struct or for "wait"
+ * to scan the entire proc table. To make life easier,
+ * we just re-parent the process we're trying to trace.
+ * The old parent is remembered so we can put things back
+ * on a "detach".
+ */
p->p_flag |= P_TRACED;
p->p_oppid = p->p_pptr->p_pid;
if (p->p_pptr != td->td_proc) {
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