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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¶
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¶
2023-03-30 | Linux man-pages 6.04 |