github.com/cellofellow/gopkg@v0.0.0-20140722061823-eec0544a62ad/osext/_demo_windows.cc (about)

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  #include <stdio.h>
     6  #include <stdlib.h>
     7  #include <signal.h>
     8  
     9  #include <windows.h>
    10  
    11  bool LockFile(const char* name, HANDLE* handle) {
    12  	*handle = INVALID_HANDLE_VALUE;
    13  	HANDLE f = CreateFileA(name,
    14  		GENERIC_READ | GENERIC_WRITE,
    15  		0, NULL, OPEN_ALWAYS,
    16  		0, NULL
    17  	);
    18  	if(f == INVALID_HANDLE_VALUE) return false;
    19  	*handle = f;
    20  	return true;
    21  }
    22  
    23  bool UnlockFile(HANDLE handle) {
    24  	return handle == INVALID_HANDLE_VALUE || CloseHandle(handle) != FALSE;
    25  }
    26  
    27  HANDLE flock;
    28  void sigHandle(int sig) {
    29  	switch(sig) {
    30  	case SIGINT:
    31  		printf("sigHandle: %d, SIGINT\n", sig);
    32  		break;
    33  	default:
    34  		printf("sigHandle: %d, OTHER\n", sig);
    35  		break;
    36  	}
    37  	UnlockFile(flock);
    38  	exit(1);
    39  }
    40  
    41  int main() {
    42  	if(LockFile("demo.lock", &flock)) {
    43  		printf("Lock Success!\n");
    44  	} else {
    45  		printf("Lock Failed!\n");
    46  	}
    47  	signal(SIGINT, sigHandle);
    48  	for(;;) {}
    49  	return 0;
    50  }