Man page - unlockpt(3)

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Manual

unlockpt

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
STANDARDS
HISTORY
SEE ALSO

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).

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STANDARDS

POSIX.1-2008.

HISTORY

glibc 2.1. POSIX.1-2001.