[Linux] 进程通信-消息队列-白红宇

[Linux] 进程通信-消息队列

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发布时间：2019-06-18

本文共 1636 字，大约阅读时间需要 5 分钟。

/* * ===================================================================================== * *       Filename:  msq.c * *    Description:   * *        Version:  1.0 *        Created:  2013年05月03日 00时20分50秒 *       Revision:  none *       Compiler:  gcc * *         Author:  linkscue (scue),  *   Organization:   * * ===================================================================================== */#include    
     
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           struct msg_buf { int mtype; char data[255];};/* * === FUNCTION ====================================================================== * Name: main * Description: * ===================================================================================== */int main ( int argc, char *argv[] ){ key_t key; int msgid; int ret; struct msg_buf msgbuf; key=ftok("/tmp/msg", 'a'); /* file to key */ printf("key = [%x]\n",key); msgid=msgget(key,IPC_CREAT|0666); /* get file key id */ if (msgid == -1) { printf("create error\n"); return -1; } msgbuf.mtype = getpid(); /* use pid to type */ strncpy(msgbuf.data, "test hehe", sizeof(msgbuf.data)); printf("msgbuf.data is [%s]\n", msgbuf.data); ret=msgsnd(msgid, &msgbuf, sizeof(msgbuf.data), IPC_NOWAIT); /* send */ if (ret == -1) { printf("send message error\n"); return -1; } memset(&msgbuf, '\0', sizeof(msgbuf)); ret=msgrcv(msgid, &msgbuf, sizeof(msgbuf.data), msgbuf.mtype, IPC_NOWAIT ); /* receive */ if (ret==-1) { printf("receive message error \n"); return -1; } printf("receive message is %s\n", msgbuf.data); return EXIT_SUCCESS;}