The Open Group Base Specifications Issue 7
IEEE Std 1003.1, 2013 Edition
Copyright © 2001-2013 The IEEE and The Open Group

#### NAME

> ptsname - get name of the slave pseudo-terminal device

#### SYNOPSIS

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

#### DESCRIPTION

> The ptsname() function shall return the name of the slave pseudo-terminal device associated with a master pseudo-terminal device. The fildes argument is a file descriptor that refers to the master device. The ptsname() function shall return a pointer to a string containing the pathname of the corresponding slave device.

> The ptsname() function need not be thread-safe.

#### RETURN VALUE

> Upon successful completion, ptsname() shall return a pointer to a string which is the name of the pseudo-terminal slave device. Upon failure, ptsname() shall return a null pointer. This could occur if fildes is an invalid file descriptor or if the slave device name does not exist in the file system.

> The application shall not modify the string returned. The returned pointer might be invalidated or the string content might be overwritten by a subsequent call to ptsname().

#### ERRORS

> No errors are defined.

The following sections are informative.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> None.

#### RATIONALE

> See the RATIONALE section for posix_openpt.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> grantpt, open, posix_openpt, ttyname, unlockpt

> XBD <stdlib.h>

#### CHANGE HISTORY

> First released in Issue 4, Version 2.

#### Issue 5

> Moved from X/OPEN UNIX extension to BASE.

> A note indicating that this function need not be reentrant is added to the DESCRIPTION.

#### Issue 7

> Austin Group Interpretation 1003.1-2001 #156 is applied.

> POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0468 [75] and XSH/TC1-2008/0469 [96] are applied.

End of informative text.

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