NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON
GRANTPT(3) Linux Programmer's Manual GRANTPT(3)
grantpt - grant access to the slave pseudo-terminal
#define _XOPEN_SOURCE
#include <stdlib.h>
int grantpt(int fd);
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.
When successful, grantpt() returns 0. Otherwise, it returns -1 and sets errno
appropriately.
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.
grantpt() is provided in glibc since version 2.1.
POSIX.1-2001.
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.
open(2), posix_openpt(3), ptsname(3), unlockpt(3), pts(4),
feature_test_macros(7), pty(7)
This page is part of release 3.23 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/.
GNU 2008-06-14 GRANTPT(3)