From 8228463cbca8d629572dbad99286c4e05886350b Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Tue, 15 Sep 2015 17:32:45 +0100 Subject: PR remote/18965: vforkdone stop reply should indicate parent PID The vforkdone stop reply misses indicating the thread ID of the vfork parent which the event relates to: @cindex vfork events, remote reply @item vfork The packet indicates that @code{vfork} was called, and @var{r} is the thread ID of the new child process. Refer to @ref{thread-id syntax} for the format of the @var{thread-id} field. This packet is only applicable to targets that support vfork events. @cindex vforkdone events, remote reply @item vforkdone The packet indicates that a child process created by a vfork has either called @code{exec} or terminated, so that the address spaces of the parent and child process are no longer shared. The @var{r} part is ignored. This packet is only applicable to targets that support vforkdone events. Unfortunately, this is not just a documentation issue. GDBserver is really not specifying the thread ID. I noticed because in non-stop mode, gdb complains: [Thread 6089.6089] #1 stopped. #0 0x0000003615a011f0 in ?? () 0x0000003615a011f0 in ?? () (gdb) set debug remote 1 (gdb) c Continuing. Sending packet: $QPassSignals:e;10;14;17;1a;1b;1c;21;24;25;2c;4c;#5f...Packet received: OK Sending packet: $vCont;c:p17c9.17c9#88...Packet received: OK Notification received: Stop:T05vfork:p17ce.17ce;06:40d7ffffff7f0000;07:30d7ffffff7f0000;10:e4c9eb1536000000;thread:p17c9.17c9;core:2; Sending packet: $vStopped#55...Packet received: OK Sending packet: $D;17ce#af...Packet received: OK Sending packet: $vCont;c:p17c9.17c9#88...Packet received: OK Notification received: Stop:T05vforkdone:; No process or thread specified in stop reply: T05vforkdone:; (gdb) This is not non-stop-mode-specific, however. Consider e.g., that in all-stop, you may be debugging more than one process at the same time. You continue, and both processes vfork. So when you next get a T05vforkdone, there's no way to tell which of the parent processes is done with the vfork. Tests will be added later. Tested on x86_64 Fedora 20. gdb/ChangeLog: 2015-09-15 Pedro Alves PR remote/18965 * remote-utils.c (prepare_resume_reply): Merge TARGET_WAITKIND_VFORK_DONE switch case with the TARGET_WAITKIND_FORKED case. gdb/doc/ChangeLog: 2015-09-15 Pedro Alves PR remote/18965 * gdb.texinfo (Stop Reply Packets): Explain that vforkdone's 'r' part indicates the thread ID of the parent process. --- gdb/doc/ChangeLog | 6 ++++++ gdb/doc/gdb.texinfo | 11 ++++++----- 2 files changed, 12 insertions(+), 5 deletions(-) (limited to 'gdb/doc') diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog index b5de969..2cc6039 100644 --- a/gdb/doc/ChangeLog +++ b/gdb/doc/ChangeLog @@ -1,3 +1,9 @@ +2015-09-15 Pedro Alves + + PR remote/18965 + * gdb.texinfo (Stop Reply Packets): Explain that vforkdone's 'r' + part indicates the thread ID of the parent process. + 2015-09-15 Yao Qi * gdb.texinfo (General Query Packets): Add vContSupported to diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index 4ecdb8f..e80e695 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -35498,11 +35498,12 @@ indicating support. @cindex vforkdone events, remote reply @item vforkdone -The packet indicates that a child process created by a vfork -has either called @code{exec} or terminated, so that the -address spaces of the parent and child process are no longer -shared. The @var{r} part is ignored. This packet is only -applicable to targets that support vforkdone events. +The packet indicates that a child process created by a vfork has +either called @code{exec} or terminated, so that the address spaces of +the parent and child process are no longer shared. The @var{r} part +is the thread ID of the parent process. Refer to @ref{thread-id +syntax} for the format of the @var{thread-id} field. This packet is +only applicable to targets that support vforkdone events. This packet should not be sent by default; older @value{GDBN} versions did not support it. @value{GDBN} requests it, by supplying an -- cgit v1.1