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Use dispatch source for parent process monitoring

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This commit is contained in:
Tae Won Ha 2017-01-08 18:45:14 +01:00
parent 9c46099b81
commit 0a94c43a9b
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GPG Key ID: E40743465B5B8B44
1 changed files with 20 additions and 24 deletions
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44
NeoVimServer/main.m
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@ -5,9 +5,6 @@
@import Foundation;
#import <sys/event.h>
#import <uv.h>
#import "NeoVimServer.h"
#import "server_globals.h"
#import "Logging.h"
@ -15,35 +12,33 @@
NeoVimServer *_neovim_server;
CFRunLoopRef _mainRunLoop;
// Ensure that no parent-less NeoVimServer processes are left when the main app crashes.
// From http://mac-os-x.10953.n7.nabble.com/Ensure-NSTask-terminates-when-parent-application-does-td31477.html
static void observe_parent_termination(void *arg) {
pid_t ppid = getppid(); // get parent pid
void observe_parent_termination() {
pid_t parentPID = getppid();
int kq = kqueue();
if (kq != -1) {
struct kevent procEvent; // wait for parent to exit
EV_SET(
&procEvent, // kevent
ppid, // ident
EVFILT_PROC, // filter
EV_ADD, // flags
NOTE_EXIT, // fflags
0, // data
0 // udata
);
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_source_t source = dispatch_source_create(
DISPATCH_SOURCE_TYPE_PROC, (uintptr_t) parentPID, DISPATCH_PROC_EXIT, queue
);
kevent(kq, &procEvent, 1, &procEvent, 1, 0);
if (source == NULL) {
WLOG("No parent process monitoring...");
return;
}
ILOG("Exiting NeoVimServer: Parent terminated.");
exit(0);
dispatch_source_set_event_handler(source, ^{
WLOG("Exiting neovim server due to parent termination.");
CFRunLoopStop(_mainRunLoop);
dispatch_source_cancel(source);
});
dispatch_resume(source);
}
int main(int argc, const char *argv[]) {
uv_thread_t parent_observer_thread;
uv_thread_create(&parent_observer_thread, observe_parent_termination, NULL);
_mainRunLoop = CFRunLoopGetCurrent();
observe_parent_termination();
@autoreleasepool {
NSArray<NSString *> *arguments = [NSProcessInfo processInfo].arguments;
@ -58,5 +53,6 @@ int main(int argc, const char *argv[]) {
}
CFRunLoopRun();
WLOG("Returning neovim server");
return 0;
}