RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 07:58:11 +00:00
Code Issues Activity Actions

Kernel: Try to do the right thing by default for unhandled signals.

Browse source
This commit is contained in:
Andreas Kling 2019-03-03 12:13:41 +01:00
parent b0c673265a
commit 725b57fe1f
1 changed files with 67 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

72
Kernel/Process.cpp
View file

@ -796,6 +796,59 @@ ShouldUnblockProcess Process::dispatch_one_pending_signal()
return dispatch_signal(signal);
}
enum class DefaultSignalAction {
Terminate,
Ignore,
DumpCore,
Stop,
Continue,
};
DefaultSignalAction default_signal_action(byte signal)
{
ASSERT(signal && signal < NSIG);
switch (signal) {
case SIGHUP:
case SIGINT:
case SIGKILL:
case SIGPIPE:
case SIGALRM:
case SIGUSR1:
case SIGUSR2:
case SIGVTALRM:
case SIGSTKFLT:
case SIGIO:
case SIGPROF:
case SIGTERM:
case SIGPWR:
return DefaultSignalAction::Terminate;
case SIGCHLD:
case SIGURG:
case SIGWINCH:
return DefaultSignalAction::Ignore;
case SIGQUIT:
case SIGILL:
case SIGTRAP:
case SIGABRT:
case SIGBUS:
case SIGFPE:
case SIGSEGV:
case SIGXCPU:
case SIGXFSZ:
case SIGSYS:
return DefaultSignalAction::DumpCore;
case SIGCONT:
return DefaultSignalAction::Continue;
case SIGSTOP:
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
return DefaultSignalAction::Stop;
}
ASSERT_NOT_REACHED();
}
ShouldUnblockProcess Process::dispatch_signal(byte signal)
{
ASSERT_INTERRUPTS_DISABLED();
@ -814,20 +867,29 @@ ShouldUnblockProcess Process::dispatch_signal(byte signal)
set_state(Stopped);
return ShouldUnblockProcess::No;
}
bool did_continue_stopped_process = false;
if (signal == SIGCONT && state() == Stopped) {
set_state(Runnable);
return ShouldUnblockProcess::Yes;
did_continue_stopped_process = true;
}
auto handler_laddr = action.handler_or_sigaction;
if (handler_laddr.is_null()) {
if (signal == SIGSTOP) {
switch (default_signal_action(signal)) {
case DefaultSignalAction::Stop:
set_state(Stopped);
} else {
// FIXME: Is termination really always the appropriate action?
return ShouldUnblockProcess::No;
case DefaultSignalAction::Continue:
return did_continue_stopped_process ? ShouldUnblockProcess::Yes : ShouldUnblockProcess::No;
case DefaultSignalAction::DumpCore:
case DefaultSignalAction::Terminate:
terminate_due_to_signal(signal);
return ShouldUnblockProcess::No;
case DefaultSignalAction::Ignore:
return ShouldUnblockProcess::No;
}
return ShouldUnblockProcess::No;
ASSERT_NOT_REACHED();
}
if (handler_laddr.as_ptr() == SIG_IGN) {