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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
UNLOCKPT(3P) POSIX Programmer's Manual UNLOCKPT(3P)
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
unlockpt — unlock a pseudo-terminal master/slave pair
#include <stdlib.h>
int unlockpt(int fildes);
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.
Upon successful completion, unlockpt() shall return 0. Otherwise, it
shall return −1 and set errno to indicate the error.
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.
None.
None.
See the RATIONALE section for posix_openpt(3p).
None.
grantpt(3p), open(3p), posix_openpt(3p), ptsname(3p)
The Base Definitions volume of POSIX.1‐2008, stdlib.h(0p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 UNLOCKPT(3P)
Pages that refer to this page: stdlib.h(0p), grantpt(3p), open(3p), posix_openpt(3p), ptsname(3p)