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been revoked returns a count of zero (end of file), and a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
is set to indicate the error.
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
- Search permission is denied for a component of the path
- Too many symbolic links were encountered in translating the
- The path argument points
outside the process's allocated address space.
- The implementation does not support the
revoke() operation on the named file.
- The caller is neither the owner of the file nor the super
() system call first appeared in
The non-blocking close method is only correctly implemented for terminal