server.c

linux下面的文件锁和信号量的程序

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

#include "key.h"

int main(int argc,char ** argv){
	int exp_opt,oflag,semid,nsems;
	union semun arg;
	ushort * ptr;
	struct semid_ds seminfo;
	oflag=SEM_MODE|IPC_CREAT;
	/*
	while((exp_opt=getopt(argc,argv,"e"))!=-1){
		switch(exp_opt){
			case 'e':
				oflag|=IPC_EXCL;
			break;
			default:
				;
		}
	}
	if(optind!=argc-2){
		printf("usage:server [-e] <pathname> <nsems>\n");
		exit(1);
	}
	*/
	//nsems=atoi(argv[optind+1]);
	//nsems=2;
	if((semid=semget(ftok(KEY_PATH,KEY_ID1),2,oflag))==-1){
		perror("semget erro!\n");
		exit(1);
	}
	printf("semaphore id is %d \n",semid);
	arg.buf=&seminfo;
	semctl(semid,0,IPC_STAT,arg);
	nsems=arg.buf->sem_nsems;
	printf("Semaphore number is %d \n",nsems);
	arg.array=ptr;
	ptr[0]=atoi(argv[1]);
	ptr[1]=atoi(argv[2]);
	semctl(semid,0,SETALL,arg);
	exit(0);
}

/* END OF FILE:server.c */