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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
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UNLOCKPT(3) Linux Programmer's Manual UNLOCKPT(3)
unlockpt - unlock a pseudoterminal master/slave pair
#define _XOPEN_SOURCE
#include <stdlib.h>
int unlockpt(int fd);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
unlockpt():
Since glibc 2.24:
_XOPEN_SOURCE >= 500 ||
(_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED)
Glibc 2.23 and earlier:
_XOPEN_SOURCE
The unlockpt() function unlocks the slave pseudoterminal device
corresponding to the master pseudoterminal referred to by fd.
unlockpt() should be called before opening the slave side of a
pseudoterminal.
When successful, unlockpt() returns 0. Otherwise, it returns -1 and
sets errno appropriately.
EBADF The fd argument is not a file descriptor open for writing.
EINVAL The fd argument is not associated with a master
pseudoterminal.
unlockpt() is provided in glibc since version 2.1.
For an explanation of the terms used in this section, see
attributes(7).
┌───────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├───────────┼───────────────┼─────────┤
│unlockpt() │ Thread safety │ MT-Safe │
└───────────┴───────────────┴─────────┘
POSIX.1-2001, POSIX.1-2008.
grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)
This page is part of release 4.15 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
2017-07-13 UNLOCKPT(3)
Pages that refer to this page: ioctl_tty(2), getpt(3), grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)
Copyright and license for this manual page
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