GRANTPT
Section: Linux Programmer's Manual (3)
Updated: 2008-06-14
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NAME
grantpt - grant access to the slave pseudo-terminal
SYNOPSIS
#define _XOPEN_SOURCE
#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
- 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.
VERSIONS
grantpt()
is provided in glibc since version 2.1.
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
open(2),
posix_openpt(3),
ptsname(3),
unlockpt(3),
pts(4),
feature_test_macros(7),
pty(7)
COLOPHON
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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