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#import <AppKit/AppKit.h>
#include <unistd.h>
@interface TerminationListener : NSObject
{
const char *executablePath;
pid_t parentProcessId;
}
- (void) relaunch;
@end
@implementation TerminationListener
- (id) initWithExecutablePath:(const char *)execPath parentProcessId:(pid_t)ppid
{
self = [super init];
if (self != nil)
{
executablePath = execPath;
parentProcessId = ppid;
if (getppid() == 1) // ppid is launchd (1) => parent terminated already
[self relaunch];
[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(watchdog:) userInfo:nil repeats:YES];
}
return self;
}
- (void)watchdog:(NSTimer *)timer
{
ProcessSerialNumber psn;
if (GetProcessForPID(parentProcessId, &psn) == procNotFound)
[self relaunch];
}
- (void) relaunch
{
[[NSWorkspace sharedWorkspace] openFile:[[NSFileManager defaultManager] stringWithFileSystemRepresentation:executablePath length:strlen(executablePath)]];
[[NSFileManager defaultManager] removeFileAtPath:[NSTemporaryDirectory() stringByAppendingPathComponent:@"relaunch"] handler:nil];
exit(0);
}
@end
int main (int argc, const char * argv[])
{
if (argc != 3) return EXIT_FAILURE;
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
[NSApplication sharedApplication];
[[[TerminationListener alloc] initWithExecutablePath:argv[1] parentProcessId:atoi(argv[2])] autorelease];
[[NSApplication sharedApplication] run];
[pool drain];
return EXIT_SUCCESS;
}
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