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Add simple privilege separation to file(1). Two processes, file
descriptors and a few other bits are opened in parent and passed to
child using imsg. Child currently drops to "nobody" but this will change.

/* $OpenBSD: file.h,v 1.27 2015/04/27 13:41:45 nicm Exp $ */

/*
 * Copyright (c) 2015 Nicholas Marriott <nicm@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef FILE_H
#define FILE_H

/* Bytes to read if can't use the whole file. */
#define FILE_READ_SIZE (256 * 1024)

/* User to drop privileges to in child process. */
#define FILE_USER "nobody"

/* text.c */
const char	*text_get_type(const void *, size_t);
const char	*text_try_words(const void *, size_t, int);

#endif /* FILE_H */