server.c

linux下面的文件锁和信号量的程序

#include "key.h"

void term_handler(int);
COMM_TABLE * comm_reg;

int main (int argc,char ** argv){
	key_t key;
	int shm_id;
	
	if(argc!=2){
		printf("you should give some parameter!\n");
		exit(1);
	}
	if(strlen(argv[1])>=20){
		printf("invalid parameter!\n");
		exit(1);
	}
	signal(SIGINT,term_handler);
	key=ftok("~/tmp",1);
	/* create a share memory if not exist */
	if((shm_id=shmget(key,sizeof(COMM_TABLE),IPC_CREAT|SHM_R|SHM_W))==-1){
		/* share memory has exist */
		if((shm_id=shmget(key,sizeof(COMM_TABLE),SHM_R|SHM_W))==-1){
			printf("shmget error %d \n",errno);
			exit(2);
		}
	}
	if((comm_reg=(COMM_TABLE *)shmat(shm_id,0,0))==(COMM_TABLE *)-1){
		printf("shmat error %d \n",errno);
		exit(3);
	}
	bzero(comm_reg,sizeof(COMM_TABLE));
	printf("Share memory id is %d\n",shm_id);
	printf("share memory attached from %x to %x\n",comm_reg,\
								comm_reg+sizeof(COMM_TABLE));
	comm_reg->is_available=0;
	sleep(10);
	//comm_reg->tc_number=atoi((const char *)argv[1]);
	//strcpy(comm_reg->message,argv[1]);
	comm_reg->is_available=1;
	pause();
}

void term_handler(int signo){
	if(signo==SIGINT){
		comm_reg->is_available=0;
		exit(0);
	}
}
/* END OF FILE server.c */