You can't get a message the message queue, has been blocked.-CodePudding

/* * * * * send. C * * * * */

 # include 
# include 
# include 
# include 
# include 

Struct msgbuf 
{
Int msg_type; 
Char msg_text [1024]. 
}; 

Void main () 
{
Key_t key; 
Int msgid; 
The int type. 
Char buf [1024]. 
Struct msgbuf MSGST; 

Msgid=msgget (1024, IPC_CREAT); 

While (1) 
{
Printf (" do input type of message: (0 to exit!) \n"); 
The scanf (" % d ", & amp; Type); 
If (type==0) 
break; 
Printf (" both please input the content of the message: \ n "); 
The scanf (" % s ", buf); 

MSGST. Msg_type=type; 
Strcpy (MSGST msg_text, buf); 
Printf (" type: % d \ ncontent: % s \ n ", MSGST. Msg_type, MSGST. Msg_text); 

MSGSND (msgid, & amp; MSGST, sizeof (struct msgbuf), 0); 

} 

MSGCTL (msgid, IPC_RMID, 0); 

}

/* * * * * * the receive. C * * * * * * * */

 # include 
# include 
# include 
# include 
# include 

Struct msgbuf 
{
Int msg_type; 
Char msg_text [1024]. 
}; 

Void main () 
{

Key_t key; 
Pid_t pid; 
Long int type. 
Char buf [1024]. 
Int msgid; 
Struct msgbuf MSGST; 

Msgid=msgget (1024, IPC_EXCL); 

While (1) 
{

Printf (" both Please enter the number of message type you want to receive: (0 to exit) \ n "); 
The scanf (" % ld ", type); 

If (type==0) 
break; 

MSGRCV (msgid, & amp; MSGST, sizeof (struct msgbuf), type, 0); 

Content: printf (" % s \ n ", MSGST. Msg_text); 
} 

MSGCTL (msgid, IPC_RMID, 0); 

}

Can send the send process, using the ipcs view also has the message queue, but don't get the message the receive process, has been in the blocking state, a great god show