when I use NSTask to execute cmd in a loop, sometime the NSTask will hang, code is like this - (BOOL)waitUntilExitWithTimeout:(CFTimeInterval)TO sendTerm:(BOOL)SENDTERM sendKill:(BOOL)SENDKILL { CFAbsoluteTime started; CFAbsoluteTime passed; BOOL exited = NO; if (![self isRunning]) return YES; int pro_pid = [self processIdentifier]; started = CFAbsoluteTimeGetCurrent(); for ( CFAbsoluteTime now = started; !exited && ((passed = now - started) < TO); now = CFAbsoluteTimeGetCurrent() ) { if (![self isRunning]) { exited = YES; } else { CFAbsoluteTime sleepTime = 0.1; useconds_t sleepUsec = round(sleepTime * 1000000.0); if (sleepUsec == 0) sleepUsec = 1; usleep(sleepUsec); // sleep for 0.1 sec } } if (!exited) { //NSLog(@"%@ didn't exit after timeout of %0.2f sec", self, TO); if (SENDTERM) { TO = 2; // 2 second timeout, waiting for SIGTERM to kill process //NSLog(@"%@ sending SIGTERM", self); //[self terminate]; // UNIX way pid_t pid = [self processIdentifier]; kill(pid, SIGTERM); started = CFAbsoluteTimeGetCurrent(); for ( CFAbsoluteTime now = started; !exited && ((passed = now - started) < TO); now = CFAbsoluteTimeGetCurrent() ) { if (![self isRunning]) { exited = YES; } else { usleep(100000); } } } if (!exited && SENDKILL) { TO = 2; // 2 second timeout, waiting for SIGKILL to kill process //NSLog(@"%@ sending SIGKILL", self); pid_t pid = [self processIdentifier]; kill(pid, SIGKILL); started = CFAbsoluteTimeGetCurrent(); for ( CFAbsoluteTime now = started; !exited && ((passed = now - started) < TO); now = CFAbsoluteTimeGetCurrent() ) { if (![self isRunning]) { exited = YES; } else { usleep(100000); // sleep for 0.1 sec } } } } return exited; } - (void) Exec(const char * cmdWithArgs) { NSTask *task = [[NSTask alloc] init]; [task setLaunchPath:@"/bin/sh"]; NSArray *arguments = [NSArray arrayWithObjects: @"-c" , [NSString stringWithFormat:@"%s", cmdWithArgs], nil]; [task setArguments: arguments]; NSPipe *pipe = [NSPipe pipe]; [task setStandardOutput: pipe]; [task launch]; NSFileHandle *file = [pipe fileHandleForReading]; NSData *data = [file readDataToEndOfFile]; [task waitUntilExitWithTimeout:30.0f sendTerm:YES sendKill:YES]; //sometime waitUntilExit will hang, sohttps://stackoverflow.com/questions/33423993/hanging-nstask-using-waituntilexit //[task waitUntilExit]; [file closeFile]; } std::string cmd = R"(netstat -rn | awk '/default/ {if ( index($6, "en0") > 0 ){print $2} }')"; while(1){ Exec(cmd.c_str()); } when the test is hang, use lldb attached process, a deadlock occur. it seems caused by the lock in NSConcreteTask anybody can help me ?

I have an app, which need to get the authorization of bluetooth. on macOS 12.0.1 (21A559), it seems something wrong. [CBCentralManager authorization] if the authorization is CBManagerAuthorizationDenied when the app is launch, even though I give the authorization in System Preferences。 [CBCentralManager authorization] also return CBManagerAuthorizationDenied. Anybody can tell me what happen?

I developed a screen watermarking program that worked fine before macOS 12.4. After upgrading to 12.4, "System Extension Blocked" pop-up cann't be click, but the other window is ok. Any body can tell me the macOS 12.4 has do what to "System Extension Blocked" pop-up !!! my sample code like this code-block NSScreen *screen = [NSScreen screens][0]; CGFloat windowWidth = screen.frame.size.width; CGFloat windowHeight = screen.frame.size.height; CGFloat x = screen.frame.origin.x; CGFloat y = screen.frame.origin.y; MyView* view = [[MyView alloc]initWithFrame:NSMakeRect(0, 0, windowWidth, windowHeight)]; NSWindow* window = [[NSPanel alloc] initWithContentRect:NSMakeRect(0, 0, windowWidth, windowHeight) styleMask: NSWindowStyleMaskBorderless | NSWindowStyleMaskNonactivatingPanel backing:NSBackingStoreBuffered defer:NO]; [window setOpaque:NO]; [window setBackgroundColor:[NSColor clearColor]]; [window setCollectionBehavior:NSWindowCollectionBehaviorCanJoinAllSpaces | NSWindowCollectionBehaviorFullScreenAuxiliary]; [window setIgnoresMouseEvents:YES]; [window setHasShadow:NO]; [window setLevel:NSScreenSaverWindowLevel]; [window setContentView:views]; [window makeKeyAndOrderFront:nil]; and draw in MyView code-block - (void)drawRect:(NSRect)dirtyRect { NSRect screen = [self bounds]; int SW = screen.size.width; int SH = screen.size.height; [[NSColor clearColor] set]; NSRectFill(screen); NSString * strH= @"watermark test."; NSMutableDictionary *md = [NSMutableDictionary dictionary]; [md setObject:[NSFont fontWithName:@"Times" size:80] forKey:NSFontAttributeName]; [strH drawAtPoint:NSMakePoint(SH*0.5, SH*0.5) withAttributes:md]; [self setNeedsDisplay:YES]; }