Section: POSIX Programmer's Manual (3P)
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
--- get name of the slave pseudo-terminal device
char *ptsname(int fildes);
function shall return the name of the slave pseudo-terminal device
associated with a master pseudo-terminal device. The
argument is a file descriptor that refers to the master device. The
function shall return a pointer to a string containing the pathname
of the corresponding slave device.
function need not be thread-safe.
Upon successful completion,
shall return a pointer to a string which is the name of the
pseudo-terminal slave device. Upon failure,
shall return a null pointer. This could occur if
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
No errors are defined.
The following sections are informative.
See the RATIONALE section for
The Base Definitions volume of POSIX.1-2008,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
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