key.h

linux下面的文件锁和信号量的程序

/******************************************************************
*	File:key.h
*	Description:Hearder of an test program for IPC using semaphore
*	Author:Luke Huang
*	Date:Jun. 14th 2002
******************************************************************/

#ifndef _SEMAPHORE_TEST_LUKE_H_
#define _SEMAPHORE_TEST_LUKE_H_

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ipc.h>
#include <sys/sem.h>

/* 
	for ftok() function,client & server use thess 
	definition to get the same IPC structures 
*/
#define KEY_PATH	"~/tmp/semaphore"
#define KEY_ID1		1
#define KEY_ID2		2

/* 
	access permission of the semaphore 
	owner read/write,group and other read.
	in LINUX there are not SEM_R,SEM_A which are defined in SVR4
*/
#define SEM_MODE	(S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
union semun{
	int val;
	struct semid_ds * buf;
	ushort * array;
};

#endif /* _SEMAPHORE_TEST_LUKE_H_ */

/* END OF FILE:key.h */