2 * Copyright (c) 2011-2012 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@dragonflybsd.org>
6 * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * Obtain a file descriptor that the caller can execute ioctl()'s on.
42 hammer2_ioctl_handle(const char *sel_path)
44 struct hammer2_ioc_version info;
50 fd = open(sel_path, O_RDONLY, 0);
52 fprintf(stderr, "hammer2: Unable to open %s: %s\n",
53 sel_path, strerror(errno));
56 if (ioctl(fd, HAMMER2IOC_VERSION_GET, &info) < 0) {
57 fprintf(stderr, "hammer2: '%s' is not a hammer2 filesystem\n",
66 hammer2_disconnect(void *(*func)(void *), void *arg)
68 pthread_t thread = NULL;
73 * Do not disconnect in debug mode
76 pthread_create(&thread, NULL, func, arg);
82 * Otherwise disconnect us. Double-fork to get rid of the ppid
83 * association and disconnect the TTY.
85 if ((pid = fork()) < 0) {
86 fprintf(stderr, "hammer2: fork(): %s\n", strerror(errno));
90 while (waitpid(pid, NULL, 0) != pid)
92 return; /* parent returns */
96 * Get rid of the TTY/session before double-forking to finish off
99 ttyfd = open("/dev/null", O_RDWR);
111 ttyfd = open("/dev/tty", O_RDWR);
113 ioctl(ttyfd, TIOCNOTTY, 0);
119 * Second fork to disconnect ppid (the original parent waits for
122 if ((pid = fork()) < 0) {
132 pthread_create(&thread, NULL, func, arg);
134 _exit(2); /* NOT REACHED */