UNLOCKPT
Section: Linux Programmer's Manual (3)Updated: 2017-07-13
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NAME
unlockpt - unlock a pseudoterminal master/slave pairSYNOPSIS
#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
DESCRIPTION
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.
RETURN VALUE
When successful, unlockpt() returns 0. Otherwise, it returns -1 and sets errno appropriately.ERRORS
- EBADF
- The fd argument is not a file descriptor open for writing.
- EINVAL
- The fd argument is not associated with a master pseudoterminal.
VERSIONS
unlockpt() is provided in glibc since version 2.1.ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).Interface | Attribute | Value |
unlockpt() | Thread safety | MT-Safe |
CONFORMING TO
POSIX.1-2001, POSIX.1-2008.SEE ALSO
grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)COLOPHON
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Time: 04:45:51 GMT, September 16, 2022
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