NAME
grantpt - grant access to the slave pseudo-terminal
SYNOPSIS
#define _XOPEN_SOURCE
#include <stdlib.h>
I int grantpt(int fd );
DESCRIPTION
The
R grantpt ()
function changes the mode and owner of the slave pseudo-terminal device
(pty) corresponding to the master pty referred to by
R fd .
The user ID of the slave is set to the real UID of the calling process.
The group ID is set to an unspecified value (e.g., tty).
The mode of the slave is set to 0620 (crw--w----).
The behavior of
R grantpt ()
is unspecified if a signal handler is installed to catch
SIGCHLD
signals.
RETURN VALUE
When successful,
R grantpt ()
returns 0.
Otherwise, it returns -1 and sets
errno
appropriately.
ERRORS
EACCES
The corresponding slave pty could not be accessed.
EBADF
The
fd
argument is not a valid open file descriptor.
EINVAL
The
fd
argument is valid but not associated with a master pty.
CONFORMING TO
POSIX.1-2001
NOTES
This is part of the Unix98 pty support, see
pts(4).
Many systems implement this function via a set-user-ID helper binary
called "pt_chown".
With Linux devpts no such helper binary is required.
SEE ALSO
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