unlockpt(3) — Linux manual page
unlockpt(3) Library Functions Manual unlockpt(3)
NAME
unlockpt - unlock a pseudoterminal master/slave pair
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#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
glibc 2.23 and earlier:
_XOPEN_SOURCE
DESCRIPTION
The unlockpt() function unlocks the slave pseudoterminal device
corresponding to the master pseudoterminal referred to by the
file descriptor fd.
unlockpt() should be called before opening the slave side of a
pseudoterminal.
RETURN VALUE
When successful, unlockpt() returns 0. Otherwise, it returns -1
and sets errno to indicate the error.
ERRORS
EBADF The fd argument is not a file descriptor open for writing.
EINVAL The fd argument is not associated with a master
pseudoterminal.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
┌─────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├─────────────────────────────────────┼───────────────┼─────────┤
│ unlockpt() │ Thread safety │ MT-Safe │
└─────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
POSIX.1-2008.
HISTORY
glibc 2.1. POSIX.1-2001.
SEE ALSO
grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)
COLOPHON
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Linux man-pages 6.9.1 2024-05-02 unlockpt(3)
Pages that refer to this page: TIOCPKT(2const), getpt(3), grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)