p11-13.c

来自「SUN Solaris8平台下进程间通信」· C语言 代码 · 共 37 行

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include "err_exit.h"
struct my_msg {           /* 消息缓冲区结构类型定义 */
    long int my_msg_type;
    char text[BUFSIZ];
};
int main(void)
{
    int running = 1;     
    int msgid;
    struct my_msg msgbuf;
    long int msg_to_receive = 0;    /* 按顺序接收消息 */
    /* 创建\打开我们的消息队列 */
    msgid = msgget((key_t)1234, 0666 | IPC_CREAT);
    if (msgid == -1) 
        err_exit("msgget failed\n");
    /* 从队列中反复接收消息，直至收到字符串"end" */
    while(running) {
        /* 按正常顺序、阻塞方式接收消息 */
        if (msgrcv(msgid, (void *)&msgbuf, BUFSIZ, msg_to_receive, 0) == -1)
            err_exit ("msgrcv failed\n");
        printf("You wrote: %s", msgbuf.text);        /* 显示收到的消息 */
        if (strncmp(msgbuf.text, "end", 3) == 0)
            running = 0;
    }
    /* 删除消息队列 */
    if (msgctl(msgid, IPC_RMID, 0) == -1) 
        err_exit("msgctl(IPC_RMID) failed\n");
    exit(EXIT_SUCCESS);
}