NAME
revoke —
revoke file access
SYNOPSIS
#include
<unistd.h>
int
revoke(const
char *path);
DESCRIPTION
The revoke 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()
from a character device file which has been revoked returns a count of zero
(end of file), and a
close()
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
superuser. 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 indicated that the call succeeded. A -1 return value indicates an error occurred and errno is set to indicated the reason.
ERRORS
Access to the named file is revoked unless one of the following:
- [
ENOTDIR] - A component of the path prefix is not a directory.
- [
ENAMETOOLONG] - A component of a pathname exceeded 255 characters, or an entire path name exceeded 1024 characters.
- [
ENOENT] - The named file or a component of the path name does not exist.
- [
EACCES] - Search permission is denied for a component of the path prefix.
- [
ELOOP] - Too many symbolic links were encountered in translating the pathname.
- [
EFAULT] - path points outside the process's allocated address space.
- [
EPERM] - The caller is neither the owner of the file nor the superuser.
SEE ALSO
HISTORY
The revoke function was introduced in
4.3BSD-Reno.