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     revoke - revoke file access


     Standard C Library (libc, -lc)


     #include <unistd.h>

     revoke(const char *path);


     The revoke() system call 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     device file which has been revoked returns a count of zero (end of file),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() 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.

     Access to a file may be revoked only by its owner or the super user.  The
     revoke() 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


     The revoke() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the


     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]           The path argument points outside the process’s
                        allocated address space.

     [EINVAL]           The implementation does not support the revoke()
                        operation on the named file.

     [EPERM]            The caller is neither the owner of the file nor the
                        super user.




     The revoke() system call first appeared in 4.3BSD-Reno.