pb queues of messages

[Guest_imported]

I am using in a program some queues to exchange messages (functions msgsnd, msgrcv).....my problem is for the use of msgctl function .........I want to use to have some infos on a queue
I wrote:
msgctl(IdQueue,IPC_STAT,infosQueue);
with this declaration:
struct msqid_ds * infosQueue;

My problem is that before like after the function , infosQueue never change.

I would like to know how does this function really works. And if somebody knows how to use it.
Thanks

 

[brudnakm]

Hello,

The problem is that infosQueue does not point to real memory.

try:

struct msqid_ds infosQueue; /* Note the missing '*' */

msgctl(IdQueue,IPC_STAT, &infosQueue); /* Note the inserted '&' */

Brudnakm