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)