NAME
unlockpt
- unlock the slave pseudo-terminal device
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
int
unlockpt(
int fildes
)
DESCRIPTION
The
unlockpt(
)
unlocks access to the pseudo-terminal device corresponding to the
master pseudo-terminal device associated with
fildes
.
Conforming applications must call this function before opening the
slave pseudo-terminal device.
RETURN VALUES
If successful,
unlockpt(
)
returns 0; otherwise a value of -1 is returned and
errno
is set to indicate the error.
ERRORS
The
unlockpt(
)
function will fail if:
- [
EACCESS
] -
the corresponding pseudo-terminal device could not be accessed.
- [
EBADF
] -
fildes
is not a valid descriptor.
- [
EINVAL
] -
fildes
is not associated with a master pseudo-terminal device.
NOTES
In
NetBSD
unlockpt(
)
does nothing.
SEE ALSO
ioctl(2),
grantpt(3),
posix_openpt(3),
ptsname(3)
STANDARDS
The
unlockpt(
)
function conforms to
IEEE Std 1003.1-2001 (``POSIX.1'') .
Its first release was in
X/Open Portability Guide Issue 4, Version 2 (``XPG4.2'') .