usleep.3: Reformat thread-safety information

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.\" %%%LICENSE_START(PUBLIC_DOMAIN)
.\" This page is in the public domain. - aeb
.\" %%%LICENSE_END
.\"
.TH UNLOCKPT 3 2013-12-09 "" "Linux Programmer's Manual"
.SH NAME
unlockpt \- unlock a pseudoterminal master/slave pair
.SH SYNOPSIS
.nf
.BR "#define _XOPEN_SOURCE" "       /* See feature_test_macros(7) */"
.br
.B #include <stdlib.h>
.sp
.BI "int unlockpt(int " fd ");"
.fi
.SH DESCRIPTION
The
.BR unlockpt ()
function unlocks the slave pseudoterminal device
corresponding to the master pseudoterminal referred to by
.IR fd .
.PP
.BR unlockpt ()
should be called before opening the slave side of a pseudoterminal.
.SH RETURN VALUE
When successful,
.BR unlockpt ()
returns 0.
Otherwise, it returns \-1 and sets
.I errno
appropriately.
.SH ERRORS
.TP
.B EBADF
The
.I fd
argument is not a file descriptor open for writing.
.TP
.B EINVAL
The
.I fd
argument is not associated with a master pseudoterminal.
.SH VERSIONS
.BR unlockpt ()
is provided in glibc since version 2.1.
.SH ATTRIBUTES
.SS Multithreading (see pthreads(7))
The
.BR unlockpt ()
function is thread-safe.
.SH CONFORMING TO
POSIX.1-2001.
.SH SEE ALSO
.BR grantpt (3),
.BR posix_openpt (3),
.BR ptsname (3),
.BR pts (4),
.BR pty (7)