grantpt

GRANTPT(3)		  Linux Programmer’s Manual		   GRANTPT(3)



NAME
       grantpt - grant access to the slave pseudotty

SYNOPSIS
       #include <stdlib.h>

       int grantpt(int fd);

DESCRIPTION
       The grantpt() function changes the mode and owner of the slave pseudo-
       terminal device (pty) corresponding to the master pty referred  to  by
       fd.   The  user	ID of the slave is set to the real UID of the calling
       process.	 The group ID is set to an unspecified value (e.g. tty).  The
       mode of the slave is set to 0620 (crw--w----).

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

RETURN VALUE
       When successful, grantpt() returns 0. Otherwise,	 it  returns  -1  and
       sets errno appropriately.

ERRORS
       EBADF  The fd argument is not a valid open file descriptor.

       EINVAL The  fd argument is valid but not associated with a master pty.

       EACCES The corresponding slave pty could not be accessed.

CONFORMING TO
       POSIX 1003.1-2001

NOTES
       This is part of the Unix98 pty  support,	 see  pts(4).	Many  systems
       implement  this function via a setuid helper binary called "pt_chown".
       With Linux devpts no such helper binary is required.

SEE ALSO
       open(2), getpt(3), ptsname(3), unlockpt(3), pts(4)



PTY Control			  2003-01-30			   GRANTPT(3)