SYNOPSIS
#define _XOPEN_SOURCE /* See feature_test_macros(7) */
#include <stdlib.h>
int unlockpt(int fd);
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.COLOPHON
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