Updated: 2022/Sep/29

Please read Privacy Policy. It's for your privacy.

REVOKE(2)                     System Calls Manual                    REVOKE(2)

     revoke - revoke file access

     Standard C Library (libc, -lc)

     #include <unistd.h>

     revoke(const char *path);

     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(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     device file which has been revoked returns a count of zero (end of file),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

     A 0 value indicates that the call succeeded.  A -1 return value indicates
     an error occurred and errno is set to indicate the reason.

     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

     [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}

     [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.

     close(2), dup(2), fcntl(2), flock(2), fstat(2), read(2), write(2)

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

NetBSD 10.99                     July 3, 2011                     NetBSD 10.99