NAME
revoke —
revoke file access
LIBRARY
library “libc”
SYNOPSIS
#include
<unistd.h>
int
revoke(const
char *path);
DESCRIPTION
Therevoke()
function invalidates all current open file descriptors in the system for the
file named by path. Subsequent operations on any such
descriptors fail, with the exceptions that a
read(2) from a character device file which has been revoked returns a
count of zero (end of file), and a
close(2) 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.
Access to a file may be revoked only by its owner or the super user.
The
revoke()
function is normally used to prepare a terminal device for a new login
session, preventing any access by a previous user of the terminal.
RETURN VALUES
A 0 value indicates that the call succeeded. A -1 return value indicates an error occurred and errno is set to indicate the reason.
ERRORS
Access to the named file is revoked unless one of the following:
- [
EACCES] - Search permission is denied for a component of the path prefix.
- [
EFAULT] - path points outside the process's allocated address space.
- [
ELOOP] - Too many symbolic links were encountered in translating the pathname.
- [
ENAMETOOLONG] - A component of a pathname exceeded {
NAME_MAX} characters, or an entire path name exceeded {PATH_MAX} characters. - [
ENOENT] - The named file or a component of the path name does not exist.
- [
ENOTDIR] - A component of the path prefix is not a directory.
- [
EPERM] - The caller is neither the owner of the file nor the super user.
SEE ALSO
close(2), dup(2), fcntl(2), flock(2), fstat(2), read(2), write(2)
HISTORY
The revoke() function was introduced in
4.3BSD-Reno.