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SP_POLL(3)                       User Manuals                       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>

SEE ALSO
       libspread(3)

SPREAD                             JULY 1998                        SP_POLL(3)