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REVOKE(2)		    BSD System Calls Manual		     REVOKE(2)

NAME
     revokerevoke 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     device file which has been revoked returns a count of zero (end of file),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 super user.  The
     revoke function is currently supported only for block and character spe‐
     cial 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 ter‐
     minal.

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 translat‐
			ing the pathname.

     [EFAULT]		Path points outside the process's allocated address
			space.

     [EINVAL]		The named file is neither a character special or block
			special file.

     [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.

BSD				 June 4, 1993				   BSD
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