SP_POLL(3)

NAME
SP_poll - checks amount of data ready to be read

SYNOPSIS
#include <sp.h>
int SP_poll( mailbox mbox);

DESCRIPTION
SP_poll is a way to poll a mailbox to see if any messages are available for receiving. The value returned will be < 0 if error, 0 if nothing is available, and the number of bytes waiting if something is there.

RETURN VALUES
Returns 0 if nothing is available or the number of bytes available, or one of the following errors ( < 0 ):

ILLEGAL_SESSION
    The session specified by mbox is illegal. Usually because it is not active.

BUGS
None.

AUTHOR
Yair Amir <yairamir@cnds.jhu.edu>
Jonathan Stanton <jonathan@cnds.jhu.edu>
Commedia Project <commedia@cnds.jhu.edu>

SEE ALSO
libsp(3)