大兴区电视台新闻视频:消息队列： msgtest.c

来源：百度文库编辑：偶看新闻时间：2024/04/29 23:10:37

#include
#include
#include
#include
#include
void msg_stat(int,struct msqid_ds);

main()
{
int gflags,sflags,rflags;
key_t key;
int msgid;
int reval;
struct msgsbuf{
int mtype;
char mtext[1];
}msg_sbuf;

struct msgmbuf{
int mtype;
char mtext[10];
}msg_rbuf;
struct msqid_ds msg_ginfo,msg_sinfo;
char *msgpath="/home/msgqueue";
key=ftok(msgpath,'a');
gflags=IPC_CREAT|IPC_EXCL;
msgid=msgget(key,gflags|00666);
if(msgid==-1){
printf("msg create error\n");
return;
}

msg_stat(msgid,msg_ginfo);
sflags=IPC_NOWAIT;
msg_sbuf.mtype=10;
msg_sbuf.mtext[0]='a';
reval=msgsnd(msgid,&msg_sbuf,sizeof(msg_sbuf.mtext),sflags);
if(reval==-1){
printf("message send error\n");
}

msg_stat(msgid,msg_ginfo);
rflags=IPC_NOWAIT|MSG_NOERROR;
reval=msgrcv(msgid,&msg_rbuf,4,10,rflags);
if(reval==-1){
printf("read msg error\n");
}
else
printf("read from msg queue %d bytes\n",reval);

msg_stat(msgid,msg_ginfo);
msg_sinfo.msg_perm.uid=8;
msg_sinfo.msg_perm.gid=8;
msg_sinfo.msg_qbytes=16388;

reval=msgctl(msgid,IPC_SET,&msg_sinfo);
if(reval==-1){
printf("msg set info error\n");
return;
}
msg_stat(msgid,msg_ginfo);
reval=msgctl(msgid,IPC_RMID,NULL);
if(reval==-1){
printf("unlink msg queue error\n");
return;
}
}

void msg_stat(int msgid,struct msqid_ds msg_info){
int reval;
sleep(1);
reval=msgctl(msgid,IPC_STAT,&msg_info);
if(reval==-1){
printf("get msg info error\n");
return;
}
printf("\n");
printf("current number of bytes on queue is %d\n",msg_info.msg_cbytes);
printf("number of messages in queue is %d\n",msg_info.msg_qnum);
printf("max number of bytes on queue is %d\n",msg_info.msg_qbytes);
printf("pid of last msgsnd is %d\n",msg_info.msg_lspid);
printf("pid of last msgrcv is %d\n",msg_info.msg_lrpid);
printf("last msgsnd time is%s",ctime(&(msg_info.msg_stime)));
printf("last msgrcv time is%s",ctime(&(msg_info.msg_rtime)));
printf("last change time is%s",ctime(&(msg_info.msg_ctime)));
printf("msg uid is%d\n",msg_info.msg_perm.uid);
printf("msg gid is%d\n",msg_info.msg_perm.gid);

}

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大兴区电视台新闻视频:消息队列 ： msgtest.c

大兴区电视台新闻视频:消息队列： msgtest.c