Provided by: libspread1-dev_3.17.4-3_amd64
SP_poll - checks amount of data ready to be read
#include <sp.h> int SP_poll( mailbox mbox);
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.
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.
Yair Amir <email@example.com> Jonathan Stanton <firstname.lastname@example.org> Commedia Project <email@example.com>