The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> grantpt - grant access to the slave pseudo-terminal device

#### SYNOPSIS

> ``[XSI] #include <stdlib.h>
> int grantpt(int` fildes`);``
> `
> `

#### DESCRIPTION

> The grantpt() function shall change the mode and ownership of the slave pseudo-terminal device associated with its master pseudo-terminal counterpart. The fildes argument is a file descriptor that refers to a master pseudo-terminal device. The user ID of the slave shall be set to the real UID of the calling process and the group ID shall be set to an unspecified group ID. The permission mode of the slave pseudo-terminal shall be set to readable and writable by the owner, and writable by the group.

> The behavior of the grantpt() function is unspecified if the application has installed a signal handler to catch SIGCHLD signals.

#### RETURN VALUE

> Upon successful completion, grantpt() shall return 0; otherwise, it shall return -1 and set errno to indicate the error.

#### ERRORS

> The grantpt() function may fail if:

> [EACCES]
>   The corresponding slave pseudo-terminal device could not be accessed.
> [EBADF]
>   The fildes argument is not a valid open file descriptor.
> [EINVAL]
>   The fildes argument is not associated with a master pseudo-terminal device.

The following sections are informative.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> None.

#### RATIONALE

> See the RATIONALE section for posix_openpt.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> open, posix_openpt, ptsname, unlockpt

> XBD <stdlib.h>

#### CHANGE HISTORY

> First released in Issue 4, Version 2.

#### Issue 5

> Moved from X/OPEN UNIX extension to BASE.

> The last paragraph of the DESCRIPTION is moved from the APPLICATION USAGE section.

#### Issue 7

> POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0272 [96] is applied.

> POSIX.1-2008, Technical Corrigendum 2, XSH/TC2-2008/0177 [506] is applied.

End of informative text.

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