GRANTPT(3P)                                         POSIX Programmer's Manual                                        GRANTPT(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
       grantpt - grant access to the slave pseudo-terminal device

SYNOPSIS
       #include <stdlib.h>

       int grantpt(int fildes);


DESCRIPTION
       The grantpt() function shall change the mode and ownership of the slave pseudo-terminal device associated with its master
       pseudo-terminal counterpart. The fildes argument is a file descriptor that refers to a master pseudo-terminal device. The
       user  ID of the slave shall be set to the real UID of the calling process and the group ID shall be set to an unspecified
       group ID.  The permission mode of the slave pseudo-terminal shall be set to readable  and  writable  by  the  owner,  and
       writable by the group.

       The  behavior of the grantpt() function is unspecified if the application has installed a signal handler to catch SIGCHLD
       signals.

RETURN VALUE
       Upon successful completion, grantpt() shall return 0; otherwise, it shall return -1 and set errno to indicate the error.

ERRORS
       The grantpt() function may fail if:

       EBADF  The fildes argument is not a valid open file descriptor.

       EINVAL The fildes argument is not associated with a master pseudo-terminal device.

       EACCES The corresponding slave pseudo-terminal device could not be accessed.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       open(), ptsname(), 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                                                   GRANTPT(3P)