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 .