GC !__DragonFly__ section.
[dragonfly.git] / sbin / nfsiod / nfsiod.c
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1/*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
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35 *
36 * @(#) Copyright (c) 1989, 1993 The Regents of the University of California. All rights reserved.
37 * @(#)nfsiod.c 8.4 (Berkeley) 5/3/95
38 * $FreeBSD: src/sbin/nfsiod/nfsiod.c,v 1.9 1999/08/28 00:13:55 peter Exp $
4f1941a6 39 * $DragonFly: src/sbin/nfsiod/nfsiod.c,v 1.5 2004/11/14 20:07:25 liamfoy Exp $
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40 */
41
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42#include <sys/param.h>
43#include <sys/syslog.h>
44#include <sys/wait.h>
45#include <sys/mount.h>
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46
47#include <nfs/rpcv2.h>
48#include <nfs/nfs.h>
49
50#include <err.h>
51#include <stdio.h>
52#include <stdlib.h>
53#include <unistd.h>
54
55/* Global defs */
56#ifdef DEBUG
57int debug = 1;
58#else
59int debug = 0;
60#endif
61
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62static void nonfs(int);
63static void reapchild(int);
64static void usage(void);
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65
66/*
67 * Nfsiod does asynchronous buffered I/O on behalf of the NFS client.
68 * It does not have to be running for correct operation, but will
69 * improve throughput.
70 */
71int
b5744197 72main(int argc, char **argv)
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73{
74 int ch, num_servers;
75 struct vfsconf vfc;
76 int error;
77
78 error = getvfsbyname("nfs", &vfc);
79 if (error && vfsisloadable("nfs")) {
80 if (vfsload("nfs"))
81 err(1, "vfsload(nfs)");
82 endvfsent(); /* flush cache */
83 error = getvfsbyname("nfs", &vfc);
84 }
85 if(error)
86 errx(1, "NFS support is not available in the running kernel");
87
88#define MAXNFSDCNT 20
89#define DEFNFSDCNT 1
90 num_servers = DEFNFSDCNT;
91 while ((ch = getopt(argc, argv, "n:")) != -1)
92 switch (ch) {
93 case 'n':
94 num_servers = atoi(optarg);
95 if (num_servers < 1 || num_servers > MAXNFSDCNT) {
96 warnx("nfsiod count %d; reset to %d",
97 num_servers, DEFNFSDCNT);
98 num_servers = DEFNFSDCNT;
99 }
100 break;
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101 default:
102 usage();
103 }
104 argc -= optind;
105 argv += optind;
106
107 /*
108 * XXX
109 * Backward compatibility, trailing number is the count of daemons.
110 */
111 if (argc > 1)
112 usage();
113 if (argc == 1) {
114 num_servers = atoi(argv[0]);
115 if (num_servers < 1 || num_servers > MAXNFSDCNT) {
116 warnx("nfsiod count %d; reset to %d", num_servers,
117 DEFNFSDCNT);
118 num_servers = DEFNFSDCNT;
119 }
120 }
121
122 if (debug == 0) {
123 daemon(0, 0);
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124 signal(SIGHUP, SIG_IGN);
125 signal(SIGINT, SIG_IGN);
126 signal(SIGQUIT, SIG_IGN);
127 signal(SIGSYS, nonfs);
984263bc 128 }
4f1941a6 129 signal(SIGCHLD, reapchild);
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130
131 openlog("nfsiod:", LOG_PID, LOG_DAEMON);
132
133 while (num_servers--)
134 switch (fork()) {
135 case -1:
136 syslog(LOG_ERR, "fork: %m");
137 exit (1);
138 case 0:
139 if (nfssvc(NFSSVC_BIOD, NULL) < 0) {
140 syslog(LOG_ERR, "nfssvc: %m");
141 exit (1);
142 }
143 exit(0);
144 }
145 exit (0);
146}
147
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148static void
149nonfs(int signo __unused)
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150{
151 syslog(LOG_ERR, "missing system call: NFS not available");
152}
153
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154static void
155reapchild(int signo __unused)
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156{
157
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158 while (wait3(NULL, WNOHANG, NULL) > 0)
159 ;
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160}
161
4f1941a6 162static void
b5744197 163usage(void)
984263bc 164{
4f1941a6 165 fprintf(stderr, "usage: nfsiod [-n num_servers]\n");
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166 exit(1);
167}