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.TH SP_POLL 3 "JULY 1998" SPREAD "User Manuals"
.SH NAME
SP_poll \- checks amount of data ready to be read
.SH SYNOPSIS
.B #include <sp.h>
.br
.BI "int SP_poll( mailbox " mbox );
.SH DESCRIPTION
.B 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.
.SH "RETURN VALUES"
Returns 0 if nothing is available or the number of bytes available, or one of the following errors ( < 0 ):
.TP 0.8i
.B ILLEGAL_SESSION
The session specified by
.I mbox
is illegal. Usually because it is not active.
.SH BUGS
None.
.SH AUTHOR
Yair Amir <yairamir@cnds.jhu.edu>
.br
Jonathan Stanton <jonathan@cnds.jhu.edu>
.br
Commedia Project <commedia@cnds.jhu.edu>
.SH "SEE ALSO"
.BR libsp (3)