what does mq_open() returns

[mohit3884]

hii
can anyone tell what does mq_open returns?? whenever i am using mq_open it always returns 3. what is the problem??
Thanxs in advance
Mohit

[digvijay.gahlot]

mq_open(3): open message queue - Linux man page

[mohit3884]

Hi, thanxs for ur reply but man page was the first thing that i searched and couldnt get a satisfactory reply... pls try something else and reply..

[i92guboj]

Hi, thanxs for ur reply but man page was the first thing that i searched and couldnt get a satisfactory reply... pls try something else and reply..

Then you will also have to describe what's the thing you don't understand.

You are trying to open a message queue descriptor, and that's what that function return: a pointer to one of those (data type: mqd_t). Just like fopen return a pointer to a FILE data type.

[wje_lf]

Quoth the highly esteemed i92guboj:

what that function return: a pointer to one of those (data type: mqd_t). Just like fopen return a pointer to a FILE data type.

That's essentially correct, but it's even more like open(), which returns a small integer, not a conventional pointer. The mqd_t is a small integer, as mohit3884 discovered, which looks (but isn't) quite unuseful, which was probably the source of his confusion.