PTSNAME(3P)                POSIX Programmer's Manual               PTSNAME(3P)

PROLOG
       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.

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

SYNOPSIS
       #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 and may set errno.  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().  The returned pointer and the string
       content might also be invalidated if the calling thread is terminated.

ERRORS
       The ptsname() function may fail if:

       EBADF  The fildes argument is not a valid file descriptor.

       ENOTTY The file associated with the fildes argument is not 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
       grantpt(), open(), posix_openpt(), ttyname(), unlockpt()

       The Base Definitions volume of POSIX.1-2017, <stdlib.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  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.opengroup.org/unix/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
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                  2017                          PTSNAME(3P)