UNLOCKPT(P) POSIX Programmer's Manual UNLOCKPT(P)NAMEunlockpt - unlock a pseudo-terminal master/slave pair
SYNOPSIS
#include <stdlib.h>
int unlockpt(int fildes);
DESCRIPTION
The unlockpt() function shall unlock the slave pseudo-terminal device
associated with the master to which fildes refers.
Conforming applications shall ensure that they call unlockpt() before
opening the slave side of a pseudo-terminal device.
RETURN VALUE
Upon successful completion, unlockpt() shall return 0. Otherwise, it
shall return -1 and set errno to indicate the error.
ERRORS
The unlockpt() function may fail if:
EBADF The fildes argument is not a file descriptor open for writing.
EINVAL The fildes argument is not associated with a master pseudo-ter‐
minal device.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOgrantpt() , open() , ptsname() , the Base Definitions volume of
IEEE Std 1003.1-2001, <stdlib.h>
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 .
IEEE/The Open Group 2003 UNLOCKPT(P)
