REVOKE(2)

NAME
revoke - revoke file access

LIBRARY
libc

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operations on any such descriptors fail, with the exceptions that a read() from a character device file which has been revoked returns a count of zero (end of file), and a close() call will succeed.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 super user. Root, jail root, and chrooted directories cannot be revoked. It 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

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 super user.

SEE ALSO
close(2)

HISTORY
The revoke() function was introduced in 4.3BSD Reno.