Manpage of GRANTPT

GRANTPT

Section: Linux Programmer's Manual (3)
Updated: 2015-08-08
Index
 

NAME

grantpt - grant access to the slave pseudoterminal  

SYNOPSIS

#define _XOPEN_SOURCE       /* See feature_test_macros(7) */

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

DESCRIPTION

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 SIGCHLDsignals.  

RETURN VALUE

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

ERRORS

EACCES
The corresponding slave pseudoterminal could not be accessed.
EBADF
The fdargument is not a valid open file descriptor.
EINVAL
The fdargument is valid but not associated with a master pseudoterminal.
 

VERSIONS

grantpt() is provided in glibc since version 2.1.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
grantpt() Thread safetyMT-Safe locale

 

CONFORMING TO

POSIX.1-2001, POSIX.1-2008.  

NOTES

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.  

SEE ALSO

open(2), posix_openpt(3), ptsname(3), unlockpt(3), pts(4), pty(7)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
VERSIONS
ATTRIBUTES
CONFORMING TO
NOTES
SEE ALSO

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