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 (con-
       sult 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  reentrant. A function that is not required to be reentrant is not required to 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.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The value returned may point to a static data area that is overwritten by each call to ptsname().

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       grantpt(), open(), ttyname(), unlockpt(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                   PTSNAME(3P)