.TH iom_add 3
.SH NAME
iom_add \- add event to I/O multiplexer
.SH SYNTAX
.B #include <libowfat/io.h>

int \fBiom_add\fP(iomux_t* c, int64 fd, unsigned int events);
.SH DESCRIPTION
iom_add adds an event you are interested in to an I/O multiplexer.

\fIfd\fR is the file descriptor (usually a socket) you are interested
in, and \fIevents\fR is the operation you want to do. It can be IOM_READ
or IOM_WRITE.

If that operation becomes possible on that descriptor, and some thread
is calling \fIiom_wait\fR at the time, it will return and tell you the
fd and the event.

Note that the event registration is removed from the iomux_t context if
it occurs. You will have to call \fIiom_wait\fR again after you handled
the event, if you are still interested in it.

Closing a file descriptor with registered events will discard the event
registration.

.SH "LINKING"
You may have to add \fI-lpthread\fR to the command line in the linking
step.

.SH "RETURN VALUE"
iom_add returns 0 on success and -1 on error, setting errno.
.SH "SEE ALSO"
iom_init, iom_wait, iom_abort