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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>
// 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 support 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.
//
// kqueue() is used to handle the signals, and the default runloop for the first
// signal handler is used for signal delivery, so keep that in mind when you're
// using this class. This class explicitly does not handle arbitrary runloops
// and threading.
//
@interface GTMSignalHandler : NSObject {
@private
int signo_;
__weak id target_;
SEL action_;
}
// 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;
@end
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