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Add comment from CSRG rev 7.27 (1992/06/23 19:56:55; author: mckusick)

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This commit is contained in:
David E. O'Brien 2011-06-17 21:44:13 +00:00
parent 5df88f46bb
commit 52e95a64ea
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=223212
1 changed files with 9 additions and 0 deletions
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9
sys/kern/sys_process.c
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@ -829,6 +829,15 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
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) {