unlockpt3
Unlock a pseudoterminal master/slave pair
Usage
#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
Library
Standard C library (libc, -lc)
Overview
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).
| Interface | Attribute | Value |
| unlockpt() | Thread safety | MT-Safe |
Releases
12 releases since Debian 3.1 (Sarge); the text changed 11 times.