grantpt: udělit přístup k pseudotty otroka

Originální popis anglicky: grantpt - grant access to the slave pseudotty

Návod, kniha: Linux Programmer's Manual

STRUČNĚ

#define _XOPEN_SOURCE
 
#include <stdlib.h>
 
int grantpt(int fd);

POPIS / INSTRUKCE

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.

NÁVRATOVÁ HODNOTA

When successful, grantpt() returns 0. Otherwise, it returns -1 and sets errno appropriately.

CHYBY / ERRORY

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.

ODPOVÍDAJÍCÍ

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.

SOUVISEJÍCÍ

open(2), getpt(3), ptsname(3), unlockpt(3), pts(4)