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. 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()

       The Base Definitions volume of POSIX.1‐2008, <stdlib.h>

COPYRIGHT

       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
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2013                                       PTSNAME(3POSIX)