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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-termi-
       nal  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 Electri-
       cal 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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                          PTSNAME(3P)