p11-20.c

SUN Solaris8平台下进程间通信

#include "outshm.h"

int main(void) /* 客户程序 */
{
    struct exchange *shm;
	int shmid;
    int producer,consumer,i;
	key_t key1=123,key2=456;
	int stop = 0;

    /* 打开信号量consumer和producer */
    consumer = semget( key1, 1, 0660 );
    producer = semget( key2, 1, 0660 );
    if (consumer == -1||producer == -1){
        printf("server dose not run.\n");
        exit(0);
    }

    /* 获得并连接名为"shared"的共享存储段 */
    shm = (struct exchange *)shminit(ftok("shared",0),&shmid);

    /* 从共享存储段读服务进程所写的数据，并输出它们*/
    for( i=0; ; i++ ){
        semaphore_P(consumer);   /* 等待数据生成完毕 */
        /* 处理数据，遇到"end"结束循环 */
        printf("Data recieived:Sequence=%d,data=%s",shm->seq,shm->buf);
        if (strncmp(shm->buf, "end", 3) == 0)
            break;
        semaphore_V(producer);  /* 让服务进程生成数据 */        
	}
    /* 分离共享存储段 */
    shmdt(shm);
    semaphore_V(producer);  /* 让服务进程生成数据 */        
	exit(0);
}