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

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (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 coun‐
       terpart. The fildes argument is a file descriptor that refers to a mas‐
       ter  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 applica‐
       tion 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-ter‐
	      minal 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,  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			    GRANTPT(P)

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