unlockpt

Sommaire

NAME

unlockpt - unlock a pseudo-terminal master/slave pair

SYNOPSIS

#define _XOPEN_SOURCE


#include <stdlib.h>
int unlockpt(int fd);

DESCRIPTION

The unlockpt() function unlocks the slave pseudo-terminal device (pty) corresponding to the master pty referred to by fd.

unlockpt() should be called before opening the slave side of a pty.

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 pty.

CONFORMING TO

POSIX.1-2001.

SEE ALSO

grantpt(3), posix_openpt(3), ptsname(3), pts(4), feature_test_macros(7), pty(7)