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      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 
     42 int
     43 main(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