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LibCore: Implement a helper that waits for a debugger then breaks

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This method can be used to force the current process to sleep, waiting
for a debugger to attach. On attach, the debugger breaks at the callsite
 directly.

This is tested on Linux and macOS, in Clion and also terminal gdb and
lldb.
This commit is contained in:
Sebastian Zaha 2023-08-02 14:09:19 +02:00 • committed by Andrew Kaster
parent 216667368d
commit 35c45a94d3
Notes: sideshowbarker 2024-07-17 05:06:13 +09:00
2 changed files with 23 additions and 0 deletions
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22
Userland/Libraries/LibCore/Process.cpp
View file

@ -166,4 +166,26 @@ ErrorOr<bool> Process::is_being_debugged()
return Error::from_string_view("Platform does not support checking for debugger"sv);
}
// Forces the process to sleep until a debugger is attached, then breaks.
void Process::wait_for_debugger_and_break()
{
bool should_print_process_info { true };
for (;;) {
auto check = Process::is_being_debugged();
if (check.is_error()) {
dbgln("Cannot wait for debugger: {}. Continuing.", check.release_error());
return;
}
if (check.value()) {
kill(getpid(), SIGTRAP);
return;
}
if (should_print_process_info) {
dbgln("Process {} with pid {} is sleeping, waiting for debugger.", Process::get_name(), getpid());
should_print_process_info = false;
}
::usleep(100 * 1000);
}
}
}

1
Userland/Libraries/LibCore/Process.h
View file

@ -31,6 +31,7 @@ public:
};
static ErrorOr<void> set_name(StringView, SetThreadName = SetThreadName::No);
static void wait_for_debugger_and_break();
static ErrorOr<bool> is_being_debugged();
};