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GRANTPT(3) Linux Programmer's Manual GRANTPT(3)
grantpt - grant access to the slave pseudoterminal
#define _XOPEN_SOURCE /* See feature_test_macros(7) */
#include <stdlib.h>
int grantpt(int fd);
The grantpt() function changes the mode and owner of the slave pseudoterminal
device corresponding to the master pseudoterminal 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 pseudoterminal 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
pseudoterminal.
grantpt() is provided in glibc since version 2.1.
POSIX.1-2001.
This is part of the UNIX 98 pseudoterminal 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), pty(7)
This page is part of release 3.32 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)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface