/*msgserver.c*/
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>
#define MSG_FILE "msgserver.c"
#define BUFFER 255
#define PERM S_IRUSR|S_IWUSR
/* 服务端创建的消息队列最后没有删除,我们要使用ipcrm命令来删除的 */
/* ipcrm -q <msqid> */
struct msgtype {
long mtype;
char buffer[BUFFER+1];
};
int main()
{
struct msgtype msg;
key_t key;
int msgid;
if((key=ftok(MSG_FILE,'a'))==-1)
{
fprintf(stderr,"Creat Key Error:%s\n", strerror(errno));
exit(1);
}
if((msgid=msgget(key, PERM|IPC_CREAT|IPC_EXCL))==-1)
{
fprintf(stderr, "Creat Message Error:%s\n", strerror(errno));
exit(1);
}
printf("msqid = %d\n", msgid);
while(1)
{
msgrcv(msgid, &msg, sizeof(struct msgtype), 1, 0);
fprintf(stderr,"Server Receive:%s\n", msg.buffer);
msg.mtype = 2;
msgsnd(msgid, &msg, sizeof(struct msgtype), 0);
}
exit(0);
}