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 * Execute the specified function as a detached independent process/daemon,
67 * unless we are in debug mode. If we are in debug mode the function is
68 * executed as a pthread in the current process.
71 hammer2_demon(void *(*func)(void *), void *arg)
73 pthread_t thread = NULL;
78 * Do not disconnect in debug mode
81 pthread_create(&thread, NULL, func, arg);
87 * Otherwise disconnect us. Double-fork to get rid of the ppid
88 * association and disconnect the TTY.
90 if ((pid = fork()) < 0) {
91 fprintf(stderr, "hammer2: fork(): %s\n", strerror(errno));
95 while (waitpid(pid, NULL, 0) != pid)
97 return; /* parent returns */
101 * Get rid of the TTY/session before double-forking to finish off
104 ttyfd = open("/dev/null", O_RDWR);
116 ttyfd = open("/dev/tty", O_RDWR);
118 ioctl(ttyfd, TIOCNOTTY, 0);
124 * Second fork to disconnect ppid (the original parent waits for
127 if ((pid = fork()) < 0) {
137 pthread_create(&thread, NULL, func, arg);
139 _exit(2); /* NOT REACHED */
143 * This swaps endian for a hammer2_msg_hdr. Note that the extended
144 * header is not adjusted, just the core header.
147 hammer2_bswap_head(hammer2_msg_hdr_t *head)
149 head->magic = bswap16(head->magic);
150 head->icrc1 = bswap16(head->icrc1);
151 head->salt = bswap32(head->salt);
152 head->source = bswap16(head->source);
153 head->target = bswap16(head->target);
154 head->msgid = bswap32(head->msgid);
155 head->cmd = bswap32(head->cmd);
156 head->error = bswap16(head->error);
157 head->resv05 = bswap16(head->resv05);
158 head->icrc2 = bswap16(head->icrc2);
159 head->aux_bytes = bswap16(head->aux_bytes);
160 head->aux_icrc = bswap32(head->aux_icrc);