消息列队
时间：2010-12-09 来源：luozhiyong131
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
struct my_msg_st
{
long int my_msg_type;
char some_text[BUFSIZ];
};
int main(void)
{
int running=1;
int msgid;
struct my_msg_st some_data;
long int msg_to_receive=0;
/*创建消息队列*/
msgid=msgget((key_t)1234,0666 | IPC_CREAT);
if(msgid==-1)
{
fprintf(stderr,"msgget failed with error: %d\n",errno);
exit(EXIT_FAILURE);
}
/*循环从消息队列中接收消息*/
while(running)
{
/*读取消息*/
if(msgrcv(msgid,(void *)&some_data,BUFSIZ,msg_to_receive,0)==-1)
{
fprintf(stderr,"msgrcv failed with error: %d\n",errno);
exit(EXIT_FAILURE);
}
printf("You wrote: %s",some_data.some_text);
/*接收到的消息为“end”时结束循环*/
if(strncmp(some_data.some_text,"end",3)==0)
{
running=0;
}
}
/*从系统内核中移走消息队列*/
if(msgctl(msgid,IPC_RMID,0)==-1)
{
fprintf(stderr,"msgctl(IPC_RMID) failed\n");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#define MAX_TEXT 512
struct my_msg_st
{
long int my_msg_type;
char some_text[MAX_TEXT];
};
int main(void)
{
int running=1;
struct my_msg_st some_data;
int msgid;
char buffer[BUFSIZ];
/*创建消息队列*/
msgid=msgget((key_t)1234,0666 | IPC_CREAT);
if(msgid==-1)
{
fprintf(stderr,"msgget failed with error:%d\n",errno);
exit(EXIT_FAILURE);
}
/*循环向消息队列中添加消息*/
while(running)
{
printf("Enter some text:");
fgets(buffer,BUFSIZ,stdin);
some_data.my_msg_type=1;
strcpy(some_data.some_text,buffer);
/*添加消息*/
if(msgsnd(msgid,(void *)&some_data,MAX_TEXT,0)==-1)
{
fprintf(stderr,"msgsed failed\n");
exit(EXIT_FAILURE);
}
/*用户输入的为“end”时结束循环*/
if(strncmp(buffer,"end",3)==0)
{
running=0;
}
}
exit(EXIT_SUCCESS);
}
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