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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "UNLOCKPT" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" unlockpt 
+.SH NAME
+unlockpt \- unlock a pseudo-terminal master/slave pair
+.SH SYNOPSIS
+.LP
+\fB#include <stdlib.h>
+.br
+.sp
+int unlockpt(int\fP \fIfildes\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIunlockpt\fP() function shall unlock the slave pseudo-terminal
+device associated with the master to which \fIfildes\fP
+refers.
+.LP
+Conforming applications shall ensure that they call \fIunlockpt\fP()
+before opening the slave side of a pseudo-terminal
+device.
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIunlockpt\fP() shall return 0. Otherwise,
+it shall return -1 and set \fIerrno\fP to indicate the
+error.
+.SH ERRORS
+.LP
+The \fIunlockpt\fP() function may fail if:
+.TP 7
+.B EBADF
+The \fIfildes\fP argument is not a file descriptor open for writing.
+.TP 7
+.B EINVAL
+The \fIfildes\fP argument is not associated with a master pseudo-terminal
+device.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIgrantpt\fP() , \fIopen\fP() , \fIptsname\fP() , the Base Definitions
+volume of IEEE\ Std\ 1003.1-2001, \fI<stdlib.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .