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unlockpt (3)
UNLOCKPT(3) Linux Programmer's Manual UNLOCKPT(3)
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), fea-
ture_test_macros(7), pty(7)
2003-01-30 UNLOCKPT(3)
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