Linux下消息队列小例子

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发送方：

#include <sys/msg.h>#include <sys/types.h>#include <sys/ipc.h>#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>struct msg{long msg_types;char msg_buf[511];};int main(void){int qid;int pid;int len;struct msg pmsg;pmsg.msg_types = getpid();sprintf(pmsg.msg_buf, "hello this is %d\n", getpid());len = strlen(pmsg.msg_buf);if ((qid=msgget(IPC_PRIVATE, IPC_CREAT | 0666)) < 0){perror("msgget");exit(1);}if ( (msgsnd(qid, &pmsg, len, 0))<0){perror("msgsnd");exit(1);}printf("successfully send msg: %d\n", qid);return 0;}

接收方：

#include <sys/msg.h>#include <sys/types.h>#include <sys/ipc.h>#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#define BUFSZ 4096struct msg{long msg_types;char msg_buf[511];};int main(int argc, char *argv[]){int qid;int len;struct msg pmsg;qid = atoi(argv[1]);len = msgrcv(qid, &pmsg, BUFSZ, 0, 0);if (len > 0){pmsg.msg_buf[len] = '\0';printf("reading queue id : %05d\n", qid);printf("mesage types %05ld\n", pmsg.msg_types);printf("message len:%d bytes\n", len);printf("message text : %s\n", pmsg.msg_buf);}else if ( len == 0){printf("no text");exit(1);}else{perror("msgrcv error!");exit(1);}system("ipcs -q");return 0;return 0;}