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.
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.
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().
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 http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
IEEE/The Open Group 2013 PTSNAME(3P)