NAME¶
unlockpt - unlock a pseudoterminal master/slave pair
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 |
POSIX.1-2001, POSIX.1-2008.
COLOPHON¶
This page is part of release 4.10 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the latest
version of this page, can be found at https://www.kernel.org/doc/man-pages/.