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 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

       See the RATIONALE section for posix_openpt().

FUTURE DIRECTIONS

       None.

SEE ALSO

       open(), posix_openpt(), ptsname(), unlockpt()

       The Base Definitions volume of POSIX.1‐2008, <stdlib.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open  Group  Base
       Specifications  Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc
       and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have  been  introduced
       during   the   conversion  of  the  source  files  to  man  page  format.  To  report  such  errors,  see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2013                                       GRANTPT(3POSIX)