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SystemServer: Implement keepalive

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When reaping a child, SystemServer will now match up child's pid with its own
record of the services, and respawn the service if keepalive is enabled for it.

For example, we want to restart the WindowServer if it crashes, but we wouldn't
want to restart the Terminal if it gets closed.
This commit is contained in:
Sergey Bugaev 2019-11-26 19:19:59 +03:00 • committed by Andreas Kling
parent b93065359e
commit 396ad4d6b2
4 changed files with 64 additions and 4 deletions
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29
Servers/SystemServer/main.cpp
View file

@ -10,12 +10,28 @@
#include <sys/wait.h>
#include <unistd.h>
void sigchld_handler(int)
static void sigchld_handler(int)
{
int status = 0;
pid_t pid = waitpid(-1, &status, WNOHANG);
if (pid)
dbg() << "reaped pid " << pid;
if (!pid)
return;
dbg() << "Reaped child with pid " << pid;
Service* service = Service::find_by_pid(pid);
if (service == nullptr) {
dbg() << "There was no service with this pid, what is going on?";
return;
}
// Call service->did_exit(status) some time soon.
// We wouldn't want to run the complex logic, such
// as possibly spawning the service again, from the
// signal handler, so defer it.
CEventLoop::main().post_event(*service, make<CDeferredInvocationEvent>([=](CObject&) {
service->did_exit(status);
}));
CEventLoop::wake();
}
static void check_for_test_mode()
@ -63,7 +79,12 @@ int main(int, char**)
{
mount_all_filesystems();
signal(SIGCHLD, sigchld_handler);
struct sigaction sa = {
.sa_handler = sigchld_handler,
.sa_mask = 0,
.sa_flags = SA_RESTART
};
sigaction(SIGCHLD, &sa, nullptr);
CEventLoop event_loop;