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, Copyright (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.opengroup.org/unix/online.html .

IEEE/The Open Group                                   2003                                            PTSNAME(P)