PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

GRANTPT(3P)               POSIX Programmer's Manual              GRANTPT(3P)

PROLOG         top

       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         top

       grantpt — grant access to the slave pseudo-terminal device

SYNOPSIS         top

       #include <stdlib.h>

       int grantpt(int fildes);

DESCRIPTION         top

       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         top

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

ERRORS         top

       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         top

       None.

APPLICATION USAGE         top

       None.

RATIONALE         top

       See the RATIONALE section for posix_openpt(3p).

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       open(3p), posix_openpt(3p), ptsname(3p), unlockpt(3p)

       The Base Definitions volume of POSIX.1‐2008, stdlib.h(0p)

COPYRIGHT         top

       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(3P)

Pages that refer to this page: stdlib.h(0p)posix_openpt(3p)ptsname(3p)unlockpt(3p)