client.c

linux下面的文件锁和信号量的程序

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

#include "key.h"

int main(int argc,char ** argv){
	key_t key;
	int sem_id;
	int nsems;
	int i;
	struct semid_ds seminfo;
	union semun arg;
	ushort * ptr;
	key=ftok(KEY_PATH,KEY_ID1);
	if((sem_id=semget(key,0,0))==-1){
		perror("semget error!\n");
		exit(1);
	}
	arg.buf=&seminfo;
	semctl(sem_id,0,IPC_STAT,arg);
	nsems=arg.buf->sem_nsems;
	ptr=calloc(nsems,sizeof(ushort));
	arg.array=ptr;
	semctl(sem_id,0,GETALL,arg);
	for(i=0;i<nsems;i++){
		printf("sem %d is %d \n",i,ptr[i]);
	}
	exit(0);
}

/* END OF FILE:server.c */