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grantpt(3) -- Linux man page
NAME
grantpt - grant access to the slave pseudotty
SYNOPSIS
#include <stdlib.h>
int grantpt(int fd);
DESCRIPTION
The
grantpt()
function changes the mode and owner of the slave pseudo-terminal device
(pty) corresponding to the master pty referred to by
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
grantpt()
is unspecified if a signal handler is installed to catch SIGCHLD signals.
RETURN VALUE
When successful,
grantpt()
returns 0. Otherwise, it returns -1 and sets
errno
appropriately.
ERRORS
- EBADF
-
The
fd
argument is not a valid open file descriptor.
- EINVAL
-
The
fd
argument is valid but not associated with a master pty.
- EACCES
-
The corresponding slave pty could not be accessed.
CONFORMING TO
POSIX 1003.1-2001
NOTES
This is part of the Unix98 pty support, see
pts(4).
Many systems implement this function via a setuid helper binary
called "pt_chown". With Linux devpts no such helper binary is required.
SEE ALSO
open(2),
getpt(3),
ptsname(3),
unlockpt(3),
pts(4)
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