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-.TH BUS_READ 3 BUS-%VERSION%
-.SH NAME
-bus_read, bus_read_timed - Listen for new messages a bus
-.SH SYNOPSIS
-.LP
-.nf
-#include <bus.h>
-.P
-int bus_read(const bus_t *\fIbus\fP, int (*\fIcallback\fP)(const char *\fImessage\fP, void *\fIuser_data\fP),
- void *\fIuser_data\fP);
-int bus_read_timed(const bus_t *\fIbus\fP, int (*\fIcallback\fP)(const char *\fImessage\fP, void *\fIuser_data\fP),
- void *\fIuser_data\fP, const struct timespec *\fItimeout\fP, clockid_t \fIclockid\fP);
-.fi
-.SH DESCRIPTION
-The
-.BR bus_read ()
-function waits for new message to be sent on the bus specified in
-\fIbus\fP, as provieded by a previous call to the
-.BR bus_open ()
-function. Once a message is received, the \fIcallback\fP function is
-invoked. The \fImessage\fP argument to the callback is the received
-message, and \fIuser_data\fP for \fIcallback\fP should be
-\fIuser_data\fP from
-.BR bus_read ().
-However, once
-.BR bus_read ()
-has ensured that it will receive any message sent on the bus, it shall
-invoke the \fIcallback\fP function with \fImessage\fP set to \fINULL\fP,
-to notify the process that it can perform any action that requires that
-it is listening on the bus.
-.PP
-After \fIcallback\fP returns, \fImessage\fP may be override. Therefore
-\fIcallback\fP should copy \fImessage\fP and start a new thread that
-uses the copy of \fImessage\fP. \fIcallback\fP shall return -1 on
-failure, 0 if
-.BR bus_read ()
-should stop listening or 1 if
-.BR bus_read ()
-should continue listening.
-.PP
-The
-.BR bus_read_timed ()
-function behaves like
-.BR bus_read (),
-except it will automatically fail and set \fIerrno\fP to \fBEAGAIN\fP
-when the specified time has passed. The time is specified as an
-absolute time using the parameter \fItimeout\fP. The behaviour is
-unspecified if \fItimeout\fP is \fINULL\fP. \fItimeout\fP is measured
-with the clock whose ID is specified by the \fIclockid\fP parameter.
-This clock must be a predicitable clock.
-.SH RETURN VALUES
-Upon successful completion, these functions returns 0. Otherwise the
-function returns -1 and sets \fIerrno\fP to indicate the error.
-.SH ERRORS
-The
-.BR bus_read (3)
-function may fail and set \fIerrno\fP to any of the errors specified for
-.BR semop (3).
-The
-.BR bus_read_timed (3)
-function may also set \fIerrno\fP to any of the errors specified for
-.BR clock_gettime (3).
-.SH SEE ALSO
-.BR bus-create (1),
-.BR bus (5),
-.BR libbus (7),
-.BR bus_open (3),
-.BR bus_write (3),
-.BR bus_poll (3),
-.BR semop (3),
-.BR clock_gettime (3)
-.SH AUTHORS
-Principal author, Mattias Andrée. See the LICENSE file for the full
-list of authors.
-.SH LICENSE
-MIT/X Consortium License.
-.SH BUGS
-Please report bugs to https://github.com/maandree/bus/issues or to
-maandree@member.fsf.org