消息队列学习小结

//  ipcs -q -i 0//  Semaphore Arrays//  Shared Memory Segments//  Messages Queues#include<sys/ipc.h>#include<string.h>#include<unistd.h>#include<sys/types.h>#include<sys/msg.h>#include<stdio.h>#include<stdlib.h>#include<errno.h>struct msgbuf {  long mtype;  char mtext[100];};int main(){  key_t key;  int msgid;  struct msgbuf msg1,msg2,msg3,msg4;  key=ftok("/home/web",'a');  if ((msgid=msgget(key,IPC_CREAT|0666))<0) {    printf("msg err\n");    printf("%s\n",strerror(errno));    exit(-1);  }  printf("please input your name:\n");  msg1.mtype=1;  strcpy(msg1.mtext,"text1");  msg3.mtype=3;  strcpy(msg3.mtext,"text3");  msg4.mtype=4;  strcpy(msg4.mtext,"text4");//  msgsnd(msgid,&msg1,sizeof(msg1.mtext),0);//  msgsnd(msgid,&msg3,sizeof(msg3.mtext),0);//  msgsnd(msgid,&msg4,sizeof(msg4.mtext),0);  msgrcv(msgid,&msg2,100,4,0);  printf("---%s\n",msg2.mtext);  return 0;}