#include<sys/msg.h>
#include<sys/types.h>
#include<sys/ipc.h>
#include<stdio.h>
#include<sys/stat.h>
char *GetFileMode(mode_t st_mode,char *resp)
{//将访问权限的整型转化成字符串型
memset(resp,'-',9);
if(st_mode & S_IRUSR)resp[0]='r';
if(st_mode & S_IWUSR)resp[1]='w';
if(st_mode & S_IXUSR)resp[2]='x';
if(st_mode & S_IRGRP)resp[3]='r';
if(st_mode & S_IWGRP)resp[4]='w';
if(st_mode & S_IXGRP)resp[5]='x';
if(st_mode & S_IROTH)resp[6]='r';
if(st_mode & S_IWOTH)resp[7]='w';
if(st_mode & S_IXOTH)resp[8]='x';
resp[9]=0;
return resp;
}
int StatMsg(int msgid)
{
char resp[20];
struct msqid_ds buf;
memset(&buf,0,sizeof(buf));
//读取消息队列结构
msgctl(msgid,IPC_STAT,&buf);
fprintf(stderr,"T ID KEY MODE OWNER GROUP CBYTE QNUM QBYTES/n");
fprintf(stderr,"a %6d %#10.8x %10s %10d %10d %10d %10d %10d/n",
msgid,
buf.msg_perm.__key,//关键字
GetFileMode(buf.msg_perm.mode,resp),
buf.msg_perm.uid,
buf.msg_perm.gid,
buf.msg_cbytes,
buf.msg_qnum,
buf.msg_qbytes);
}
void main(int argc,char *argv[])
{
int msgid;
if(argc!=2 && argc!=3)return;
msgid=atoi(argv[1]);
if(argc==2)
{
//查询消息队列信息
StatMsg(msgid);
}
else if(argc==3 && strcmp(argv[2],"c")==0)
{
//创建消息队列
if(msgget(msgid,0666|IPC_CREAT|IPC_EXCL)<0)
fprintf(stderr,"Create msg %#10.8 failed ./n",msgid);
else
fprintf(stderr,"Create msg %#10.8x success./n",msgid);
}
else if(argc==3 && strcmp(argv[2],"d")==0)
{
//删除消息队列
if(msgctl(msgid,IPC_RMID,NULL)<0)
fprintf(stderr,"Delete msg %d failed./n",msgid);
else
fprintf(stderr,"Delete msg %d success./n",msgid);
}
}