From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265441AbTFVBhd (ORCPT ); Sat, 21 Jun 2003 21:37:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265449AbTFVBhd (ORCPT ); Sat, 21 Jun 2003 21:37:33 -0400 Received: from crack.them.org ([146.82.138.56]:16364 "EHLO crack.them.org") by vger.kernel.org with ESMTP id S265441AbTFVBhY (ORCPT ); Sat, 21 Jun 2003 21:37:24 -0400 Date: Sat, 21 Jun 2003 21:51:24 -0400 From: Daniel Jacobowitz To: torvalds@transmeta.com Cc: linux-kernel@vger.kernel.org Subject: [PTRACE PATCH] Report detached thread exit to the debugger Message-ID: <20030622015124.GA15600@nevyn.them.org> Mail-Followup-To: torvalds@transmeta.com, linux-kernel@vger.kernel.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Right now, CLONE_DETACHED threads silently vanish from GDB's sight when they exit. This patch lets report exit to the debugger, and then be auto-reaped as soon as it collects them, instead of being released as soon as they exit. GDB works either way, but this is more correct and will be useful for some later GDB patches. Please apply - thanks! diff -Nru a/kernel/exit.c b/kernel/exit.c --- a/kernel/exit.c Sat Jun 21 21:50:35 2003 +++ b/kernel/exit.c Sat Jun 21 21:50:35 2003 @@ -651,6 +651,8 @@ if (tsk->exit_signal != -1) { int signal = tsk->parent == tsk->real_parent ? tsk->exit_signal : SIGCHLD; do_notify_parent(tsk, signal); + } else if (tsk->ptrace) { + do_notify_parent(tsk, SIGCHLD); } tsk->state = TASK_ZOMBIE; @@ -715,7 +717,7 @@ tsk->exit_code = code; exit_notify(tsk); - if (tsk->exit_signal == -1) + if (tsk->exit_signal == -1 && tsk->ptrace == 0) release_task(tsk); schedule(); @@ -859,7 +861,7 @@ BUG_ON(state != TASK_DEAD); return 0; } - if (unlikely(p->exit_signal == -1)) + if (unlikely(p->exit_signal == -1 && p->ptrace == 0)) /* * This can only happen in a race with a ptraced thread * dying on another processor. @@ -889,8 +891,12 @@ /* Double-check with lock held. */ if (p->real_parent != p->parent) { __ptrace_unlink(p); - do_notify_parent(p, p->exit_signal); p->state = TASK_ZOMBIE; + /* If this is a detached thread, this is where it goes away. */ + if (p->exit_signal == -1) + release_task (p); + else + do_notify_parent(p, p->exit_signal); p = NULL; } write_unlock_irq(&tasklist_lock); -- Daniel Jacobowitz MontaVista Software Debian GNU/Linux Developer