Out-of-band data is only supported on some stream socket protocols.
.BR sockatmark ()
-can safely be called from a handler for the SIGURG signal.
+can safely be called from a handler for the
+.B SIGURG
+signal.
.BR sockatmark ()
is implemented using the
.BR sockatmark ()
did not work.
.SH EXAMPLE
-The following code can be used after receipt of a SIGURG signal
-to read (and discard) all data up to the mark,
+The following code can be used after receipt of a
+.B SIGURG
+signal to read (and discard) all data up to the mark,
and then read the byte of data at the mark:
.nf