Date: Wed, 16 Sep 2015 18:53:31 -0700 From: John Baldwin <jhb@freebsd.org> To: src-committers@freebsd.org Cc: svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r287864 - head/sys/kern Message-ID: <1476335.DNMxzjPDBI@ralph.baldwin.cx> In-Reply-To: <201509161640.t8GGe8KD082156@repo.freebsd.org> References: <201509161640.t8GGe8KD082156@repo.freebsd.org>
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On Wednesday, September 16, 2015 04:40:08 PM John Baldwin wrote: > Author: jhb > Date: Wed Sep 16 16:40:07 2015 > New Revision: 287864 > URL: https://svnweb.freebsd.org/changeset/base/287864 > > Log: > When a process group leader exits, all of the processes in the group are > sent SIGHUP and SIGCONT if any of the processes are stopped. Currently this > behavior is triggered for any type of process stop including ptrace() stops > and transient stops for single threading during exit() and execve(). > Thus, if a debugger is attached to a process in a group when the leader > exits, the entire group can be HUPed. Instead, only send the signals if a > process in the group is stopped due to SIGSTOP. In particular, gdb creates a new process group each time it runs a new process. If that process forks a child and gdb follows the child, the child is killed with SIGHUP when the parent exits without this fix. -- John Baldwin
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