Date: Mon, 16 Apr 2012 07:55:51 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Dmitry Mikulin <dmitrym@juniper.net> Cc: toolchain@freebsd.org Subject: Re: gdb support for follow-fork Message-ID: <20120416045551.GZ2358@deviant.kiev.zoral.com.ua> In-Reply-To: <4F8737E9.6010300@juniper.net> References: <4F8737E9.6010300@juniper.net>
next in thread | previous in thread | raw e-mail | index | archive | help
[-- Attachment #1 --] On Thu, Apr 12, 2012 at 01:15:37PM -0700, Dmitry Mikulin wrote: > Hi, > > I implemented support for follow-fork mode in gdb and would like to submit > it for a review. The feature allows users to specify which process to > follow when the inferior does a fork(). The default mode is to stay with > the parent. A gdb command is used to switch between following the > child/parent: > > set follow-fork-mode child > set follow-fork-mode parent > > When gdb is set to follow the child, it detaches from the parent at the > fork() point and continues to trace the newly created child. > > Gdb uses support that has recently been implemented in the FreeBSD kernel. > A new ptrace() request, PT_FOLLOW_FORK was added to generate a SIGTRAP at > the point where a child process is created. This allows gdb switch from > parent to child. PT_FOLLOW_EXEC was added to SIGTRAP on return from exit() > to allow gdb to load a new binary for debugging. > > I attached the patch here. > Please let me know if can provide additional info. Yes, could you, please, split the patch somewhat ? It would be much easier to review if you were able to provide relatively small pieces with descriptions. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAk+LplYACgkQC3+MBN1Mb4jKIACfQPHnrrTi5ROomB2yR776Vmy8 bJcAoNFL61TdqVkVw4nizSSLgZK185Om =HiE6 -----END PGP SIGNATURE-----
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20120416045551.GZ2358>