Date: Fri, 17 Jun 2011 21:44:13 +0000 (UTC) From: "David E. O'Brien" <obrien@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r223212 - head/sys/kern Message-ID: <201106172144.p5HLiDdP009295@svn.freebsd.org>
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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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