1/* $NetBSD: rump_open_tap.c,v 1.1 2020/09/30 14:43:15 roy Exp $ */
2
3/*
4 * Copyright (c) 2020 The NetBSD Foundation, Inc.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Roy Marples.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__RCSID("$NetBSD: rump_open_tap.c,v 1.1 2020/09/30 14:43:15 roy Exp $");
32
33#include <err.h>
34#include <fcntl.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <unistd.h>
38
39#include <rump/rump_syscalls.h>
40#include <rump/rumpclient.h>
41
42int
43main(int argc, char **argv)
44{
45	int fd;
46
47	if (argc < 2)
48		errx(EXIT_FAILURE, "No path specified");
49
50	rumpclient_init();
51
52	fd = rump_sys_open(argv[1], O_RDWR);
53	if (fd == -1)
54		err(EXIT_FAILURE, "open: %s", argv[1]);
55
56	if (argc > 2) {
57		FILE *fp;
58		pid_t pid;
59
60		fp = fopen(argv[2], "w");
61		if (fp == NULL)
62			err(EXIT_FAILURE, "fopen: %s", argv[2]);
63
64		pid = fork();
65		switch (pid) {
66		case -1:
67			err(EXIT_FAILURE, "fork");
68		case 0:
69			break;
70		default:
71			fprintf(fp, "%d\n", pid);
72			exit(EXIT_SUCCESS);
73		}
74	}
75
76	/* Spin with the fd open */
77	for (;;)
78		sleep(100);
79}
80