jingham created this revision.
jingham added reviewers: labath, JDevlieghere, krytarowski, emaste.
Herald added subscribers: lldb-commits, atanasyan, jrtc27, sdardis.
Herald added a project: LLDB.
jingham requested review of this revision.
The macOS LaunchServices agent sends a SIGCONT to the process it is managing in
the process of starting up. This means processes that lldb attaches to when
run by this agent stop somewhere in their startup with a SIGCONT. That's a bit
annoying if you are trying to debug, and really annoying if you are running
batch tests in the debugger, for instance.
That can be fixed by changing your "SIGCONT" handling, but when the issue came
to my attention, it got me wondering whether stopping in the debugger for
SIGCONT is really useful behavior? For the most part this means some job
control operation was going on, but do you actually want to stop again after
something, for instance, stopped & resumed your app? It seems to me unless you
are explicitly debugging an interaction with this job control, stopping is just
an annoyance.
So I'm proposing to change the default behavior to nonstop/noprint/pass from
stop/print/pass.
I'm adding folks that are responsible for some of the other Unixen platforms as
reviewers. If anybody has a good use case where this would be useful as a
default, please speak up and I'll ditch this revision (and just get the clients
that deal with LS to change the handling on their own.)
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D89019
Files:
lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
lldb/source/Plugins/Process/Utility/MipsLinuxSignals.cpp
lldb/source/Target/UnixSignals.cpp
Index: lldb/source/Target/UnixSignals.cpp
===================================================================
--- lldb/source/Target/UnixSignals.cpp
+++ lldb/source/Target/UnixSignals.cpp
@@ -94,7 +94,7 @@
AddSignal(16, "SIGURG", false, false, false, "urgent condition
on IO channel");
AddSignal(17, "SIGSTOP", true, true, true, "sendable stop
signal not from tty");
AddSignal(18, "SIGTSTP", false, true, true, "stop signal from
tty");
- AddSignal(19, "SIGCONT", false, true, true, "continue a
stopped process");
+ AddSignal(19, "SIGCONT", false, false, false, "continue a
stopped process");
AddSignal(20, "SIGCHLD", false, false, false, "to parent on
child stop or exit");
AddSignal(21, "SIGTTIN", false, true, true, "to readers
process group upon background tty read");
AddSignal(22, "SIGTTOU", false, true, true, "to readers
process group upon background tty write");
Index: lldb/source/Plugins/Process/Utility/MipsLinuxSignals.cpp
===================================================================
--- lldb/source/Plugins/Process/Utility/MipsLinuxSignals.cpp
+++ lldb/source/Plugins/Process/Utility/MipsLinuxSignals.cpp
@@ -45,7 +45,7 @@
"SIGPOLL");
AddSignal(23, "SIGSTOP", true, true, true, "process stop");
AddSignal(24, "SIGTSTP", false, true, true, "tty stop");
- AddSignal(25, "SIGCONT", false, true, true, "process continue");
+ AddSignal(25, "SIGCONT", false, false, false, "process continue");
AddSignal(26, "SIGTTIN", false, true, true, "background tty read");
AddSignal(27, "SIGTTOU", false, true, true, "background tty write");
AddSignal(28, "SIGVTALRM", false, true, true, "virtual time alarm");
Index: lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
===================================================================
--- lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
+++ lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
@@ -37,7 +37,7 @@
AddSignal(16, "SIGSTKFLT", false, true, true, "stack fault");
AddSignal(17, "SIGCHLD", false, false, true, "child status has changed",
"SIGCLD");
- AddSignal(18, "SIGCONT", false, true, true, "process continue");
+ AddSignal(18, "SIGCONT", false, false, false, "process continue");
AddSignal(19, "SIGSTOP", true, true, true, "process stop");
AddSignal(20, "SIGTSTP", false, true, true, "tty stop");
AddSignal(21, "SIGTTIN", false, true, true, "background tty read");
Index: lldb/source/Target/UnixSignals.cpp
===================================================================
--- lldb/source/Target/UnixSignals.cpp
+++ lldb/source/Target/UnixSignals.cpp
@@ -94,7 +94,7 @@
AddSignal(16, "SIGURG", false, false, false, "urgent condition on IO channel");
AddSignal(17, "SIGSTOP", true, true, true, "sendable stop signal not from tty");
AddSignal(18, "SIGTSTP", false, true, true, "stop signal from tty");
- AddSignal(19, "SIGCONT", false, true, true, "continue a stopped process");
+ AddSignal(19, "SIGCONT", false, false, false, "continue a stopped process");
AddSignal(20, "SIGCHLD", false, false, false, "to parent on child stop or exit");
AddSignal(21, "SIGTTIN", false, true, true, "to readers process group upon background tty read");
AddSignal(22, "SIGTTOU", false, true, true, "to readers process group upon background tty write");
Index: lldb/source/Plugins/Process/Utility/MipsLinuxSignals.cpp
===================================================================
--- lldb/source/Plugins/Process/Utility/MipsLinuxSignals.cpp
+++ lldb/source/Plugins/Process/Utility/MipsLinuxSignals.cpp
@@ -45,7 +45,7 @@
"SIGPOLL");
AddSignal(23, "SIGSTOP", true, true, true, "process stop");
AddSignal(24, "SIGTSTP", false, true, true, "tty stop");
- AddSignal(25, "SIGCONT", false, true, true, "process continue");
+ AddSignal(25, "SIGCONT", false, false, false, "process continue");
AddSignal(26, "SIGTTIN", false, true, true, "background tty read");
AddSignal(27, "SIGTTOU", false, true, true, "background tty write");
AddSignal(28, "SIGVTALRM", false, true, true, "virtual time alarm");
Index: lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
===================================================================
--- lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
+++ lldb/source/Plugins/Process/Utility/LinuxSignals.cpp
@@ -37,7 +37,7 @@
AddSignal(16, "SIGSTKFLT", false, true, true, "stack fault");
AddSignal(17, "SIGCHLD", false, false, true, "child status has changed",
"SIGCLD");
- AddSignal(18, "SIGCONT", false, true, true, "process continue");
+ AddSignal(18, "SIGCONT", false, false, false, "process continue");
AddSignal(19, "SIGSTOP", true, true, true, "process stop");
AddSignal(20, "SIGTSTP", false, true, true, "tty stop");
AddSignal(21, "SIGTTIN", false, true, true, "background tty read");
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