linux man page for ptsname

PTSNAME(P)						     POSIX Programmer's Manual							PTSNAME(P)

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 fail-
       ure, 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 Technol-
       ogy -- 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)