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//
// GTMSignalHandler.h
//
// Copyright 2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import <Foundation/Foundation.h>
#import "GTMDefines.h"
// GTMSignalHandler.
//
// This is a very simple, easy-to-use class for registering handlers that get
// called when a specific signal is delivered. Also handy for ignoring
// inconvenient signals. Ignoring SIGKILL is not supported for what should be
// obvious reasons. You can pass nil for target & action to ignore the signal.
//
// Example of how to catch SIGABRT and SIGTERM while ignring SIGWINCH:
// GTMSignalHandler *abrt, *term, *winch;
// abrt = [[GTMSignalHandler alloc]
// initWithSignal:SIGABRT
// target:self
// action:@selector(handleAbort:)];
//
// term = [[GTMSignalHandler alloc]
// initWithSignal:SIGTERM
// target:self
// action:@selector(handleTerm:)];
//
// winch = [[GTMSignalHandler alloc] initWithSignal:SIGWINCH
// initWithSignal:SIGWINCH
// target:nil
// action:NULL
//
// -(void)handleTerm:(int)signo {
// .. do stuff ..
// }
//
// Release the handler when you're no longer interested in handling that signal.
// Note that signal(SIG_IGN, signo) is performed on each signal handled by
// objects of this class, and those do not get un-done.
//
// Multiple handlers for the same signal is NOT supported.
//
// libdispatch is used to handle the signals. NB that sending a signal
// from dispatch_get_main_queue will not get caught in a CFRunLoop based run
// loop.
// https://openradar.appspot.com/radar?id=5030997057863680
NS_DEPRECATED(10_0, 10_6, 1_0, 4_0, "Use a DISPATCH_SOURCE_TYPE_SIGNAL dispatch source.")
@interface GTMSignalHandler : NSObject {
@private
dispatch_source_t signalSource_;
}
// Returns a retained signal handler object that will invoke |handler| on the
// |target| whenever a signal of number |signo| is delivered to the process.
-(id)initWithSignal:(int)signo
target:(id)target
action:(SEL)action;
// Invalidates the handler so that it isn't listening anymore.
- (void)invalidate;
@end
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