revoke(2) - NetBSD Manual Pages

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REVOKE(2)                 NetBSD System Calls Manual                 REVOKE(2)


NAME

     revoke - revoke file access


LIBRARY

     Standard C Library (libc, -lc)


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     device file which has been revoked returns a count of zero (end of file),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

     revoke is normally used to prepare a terminal device for a new login ses-
     sion, 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:

     [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 translat-
                        ing 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), dup(2), fcntl(2), flock(2), fstat(2), read(2), write(2)


HISTORY

     The revoke function was introduced in 4.3BSD-Reno.

NetBSD 2.0                      March 22, 1999                      NetBSD 2.0