Originální popis anglicky:
grantpt - grant access to the slave pseudotty
Návod, kniha: Linux Programmer's Manual
#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.
POSIX 1003.1-2001
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.
open(2),
getpt(3),
ptsname(3),
unlockpt(3),
pts(4)
