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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 dif-
       fer (consult 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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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                          GRANTPT(3P)