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grantpt(3p)

IEEE/The Open Group
2013

man-pages

Linux kernel and C library user-space interface documentation

man-pages-posix

POSIX Manual Pages

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 .
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