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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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unlockpt(3) Library Functions Manual unlockpt(3)
unlockpt - unlock a pseudoterminal master/slave pair
Standard C library (libc, -lc)
#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
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.
When successful, unlockpt() returns 0. Otherwise, it returns -1
and sets errno to indicate the error.
EBADF The fd argument is not a file descriptor open for writing.
EINVAL The fd argument is not associated with a master
pseudoterminal.
For an explanation of the terms used in this section, see
attributes(7).
┌─────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├─────────────────────────────────────┼───────────────┼─────────┤
│ unlockpt() │ Thread safety │ MT-Safe │
└─────────────────────────────────────┴───────────────┴─────────┘
POSIX.1-2008.
glibc 2.1. POSIX.1-2001.
grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)
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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)
Copyright and license for this manual page
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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