52b0bd06a8
For services explicitly configured as lazy, SystemServer will now listen on the socket and only spawn the service once a client attempts to connect to the socket.
106 lines
2.9 KiB
C++
106 lines
2.9 KiB
C++
#include "Service.h"
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#include <AK/Assertions.h>
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#include <LibCore/CConfigFile.h>
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#include <LibCore/CEventLoop.h>
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#include <LibCore/CFile.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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static void sigchld_handler(int)
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{
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int status = 0;
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pid_t pid = waitpid(-1, &status, WNOHANG);
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if (!pid)
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return;
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dbg() << "Reaped child with pid " << pid;
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Service* service = Service::find_by_pid(pid);
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if (service == nullptr) {
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dbg() << "There was no service with this pid, what is going on?";
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return;
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}
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// Call service->did_exit(status) some time soon.
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// We wouldn't want to run the complex logic, such
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// as possibly spawning the service again, from the
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// signal handler, so defer it.
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CEventLoop::main().post_event(*service, make<CDeferredInvocationEvent>([=](CObject&) {
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service->did_exit(status);
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}));
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CEventLoop::wake();
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}
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static void check_for_test_mode()
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{
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auto f = CFile::construct("/proc/cmdline");
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if (!f->open(CIODevice::ReadOnly)) {
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dbg() << "Failed to read command line: " << f->error_string();
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ASSERT(false);
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}
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const String cmd = String::copy(f->read_all());
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dbg() << "Read command line: " << cmd;
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if (cmd.matches("*testmode=1*")) {
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// Eventually, we should run a test binary and wait for it to finish
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// before shutting down. But this is good enough for now.
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dbg() << "Waiting for testmode shutdown...";
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sleep(5);
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dbg() << "Shutting down due to testmode...";
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if (fork() == 0) {
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execl("/bin/shutdown", "/bin/shutdown", "-n", nullptr);
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ASSERT_NOT_REACHED();
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}
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} else {
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dbg() << "Continuing normally";
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}
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}
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static void mount_all_filesystems()
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{
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dbg() << "Spawning mount -a to mount all filesystems.";
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pid_t pid = fork();
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if (pid < 0) {
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perror("fork");
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ASSERT_NOT_REACHED();
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} else if (pid == 0) {
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execl("/bin/mount", "mount", "-a", nullptr);
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perror("exec");
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ASSERT_NOT_REACHED();
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} else {
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wait(nullptr);
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}
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}
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int main(int, char**)
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{
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mount_all_filesystems();
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struct sigaction sa = {
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.sa_handler = sigchld_handler,
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.sa_mask = 0,
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.sa_flags = SA_RESTART
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};
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sigaction(SIGCHLD, &sa, nullptr);
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CEventLoop event_loop;
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// Read our config and instantiate services.
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// This takes care of setting up sockets.
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Vector<RefPtr<Service>> services;
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auto config = CConfigFile::get_for_system("SystemServer");
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for (auto name : config->groups())
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services.append(Service::construct(*config, name));
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// After we've set them all up, activate them!
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for (auto& service : services)
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service->activate();
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// This won't return if we're in test mode.
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check_for_test_mode();
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return event_loop.exec();
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}
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