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-terminal
device.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
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 .