revoke file access
Standard C Library (libc, -lc)
() system call invalidates all
current open file descriptors in the system for the file named by
. Subsequent operations on any such
descriptors fail, with the exceptions that a
() from a character device file which
has been revoked returns a count of zero (end of file), and a
() system call will succeed. If the
file is a special file for a device which is open, the device close function
is called as if all open references to the file had been closed using a
special close method which does not block.
Access to a file may be revoked only by its owner or the super user. The
() system call is currently supported
only for block and character special device files. It is normally used to
prepare a terminal device for a new login session, preventing any access by a
previous user of the terminal.
() function returns the
value 0 if successful; otherwise the value -1 is returned and
the global variable errno
is set to indicate
Access to the named file is revoked unless one of the following:
- A component of the path prefix is not a directory.
- A component of a pathname exceeded 255 characters, or an entire path name
exceeded 1024 characters.
- The named file or a component of the path name does not exist.
- Search permission is denied for a component of the path prefix.
- Too many symbolic links were encountered in translating the pathname.
- The path argument points outside the
process's allocated address space.
- The implementation does not support the
revoke() operation on the named
- The caller is neither the owner of the file nor the super user.
() system call first appeared in
The non-blocking close method is only correctly implemented for terminal