Linux进程间通信——使用消息队列

#include <errno.h>

#include <sys/msg.h>

struct msg_st

{

long int msg_type;

char text[BUFSIZ];

};

int main()

{

int running = 1;

int msgid = -1;

struct msg_st data;

long int msgtype = 0; //留意1

//建立消息队列

msgid = msgget((key_t)1234, 0666 | IPC_CREAT);

if(msgid == -1)

{

fprintf(stderr, "msgget failed with error: %d\n", errno);

exit(EXIT_FAILURE);

}

//大年夜队列中获撤消息，直到碰到end消息为止

while(running)

{

if(msgrcv(msgid, (void*)&data, BUFSIZ, msgtype, 0) == -1)

{

fprintf(stderr, "msgrcv failed with errno: %d\n", errno);

exit(EXIT_FAILURE);

}

printf("You wrote: %s\n",data.text);

//碰到end停止

if(strncmp(data.text,

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