nfsiod.tproj/nfsiod.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1989, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * This code is derived from software contributed to Berkeley by
  29  * Rick Macklem at The University of Guelph.
  30  *
  31  * Redistribution and use in source and binary forms, with or without
  32  * modification, are permitted provided that the following conditions
  33  * are met:
  34  * 1. Redistributions of source code must retain the above copyright
  35  *    notice, this list of conditions and the following disclaimer.
  36  * 2. Redistributions in binary form must reproduce the above copyright
  37  *    notice, this list of conditions and the following disclaimer in the
  38  *    documentation and/or other materials provided with the distribution.
  39  * 3. All advertising materials mentioning features or use of this software
  40  *    must display the following acknowledgement:
  41  *      This product includes software developed by the University of
  42  *      California, Berkeley and its contributors.
  43  * 4. Neither the name of the University nor the names of its contributors
  44  *    may be used to endorse or promote products derived from this software
  45  *    without specific prior written permission.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  57  * SUCH DAMAGE.
  58  */
  59
  60
  61 #include <sys/param.h>
  62 #include <sys/ioctl.h>
  63 #include <sys/syslog.h>
  64 #include <sys/ucred.h>
  65 #include <sys/wait.h>
  66
  67 #include <sys/mount.h>
  68 #include <sys/time.h>
  69 #include <nfs/rpcv2.h>
  70 #include <nfs/nfsproto.h>
  71 #include <nfs/nfs.h>
  72
  73 #include <err.h>
  74 #include <errno.h>
  75 #include <fcntl.h>
  76 #include <signal.h>
  77 #include <stdio.h>
  78 #include <stdlib.h>
  79 #include <unistd.h>
  80
  81 /* Global defs */
  82 #ifdef DEBUG
  83 int debug = 1;
  84 #else
  85 int debug = 0;
  86 #endif
  87
  88 void nonfs __P((int));
  89 void reapchild __P((int));
  90 void usage __P((void));
  91
  92 /*
  93  * Nfsiod does asynchronous buffered I/O on behalf of the NFS client.
  94  * It does not have to be running for correct operation, but will
  95  * improve throughput.
  96  */
  97 int
  98 main(argc, argv)
  99         int argc;
 100         char *argv[];
 101 {
 102         int ch, num_servers;
 103
 104 #define MAXNFSDCNT      20
 105 #define DEFNFSDCNT       1
 106         num_servers = DEFNFSDCNT;
 107         while ((ch = getopt(argc, argv, "n:")) != EOF)
 108                 switch (ch) {
 109                 case 'n':
 110                         num_servers = atoi(optarg);
 111                         if (num_servers < 1 || num_servers > MAXNFSDCNT) {
 112                                 warnx("nfsiod count %d; reset to %d",
 113                                     DEFNFSDCNT);
 114                                 num_servers = DEFNFSDCNT;
 115                         }
 116                         break;
 117                 case '?':
 118                 default:
 119                         usage();
 120                 }
 121         argc -= optind;
 122         argv += optind;
 123
 124         /*
 125          * XXX
 126          * Backward compatibility, trailing number is the count of daemons.
 127          */
 128         if (argc > 1)
 129                 usage();
 130         if (argc == 1) {
 131                 num_servers = atoi(argv[0]);
 132                 if (num_servers < 1 || num_servers > MAXNFSDCNT) {
 133                         warnx("nfsiod count %d; reset to %d", DEFNFSDCNT);
 134                         num_servers = DEFNFSDCNT;
 135                 }
 136         }
 137
 138         if (debug == 0) {
 139                 daemon(0, 0);
 140                 (void)signal(SIGHUP, SIG_IGN);
 141                 (void)signal(SIGINT, SIG_IGN);
 142                 (void)signal(SIGQUIT, SIG_IGN);
 143                 (void)signal(SIGSYS, nonfs);
 144         }
 145         (void)signal(SIGCHLD, reapchild);
 146
 147         openlog("nfsiod:", LOG_PID, LOG_DAEMON);
 148
 149         while (num_servers--)
 150                 switch (fork()) {
 151                 case -1:
 152                         syslog(LOG_ERR, "fork: %m");
 153                         exit (1);
 154                 case 0:
 155                         if (nfssvc(NFSSVC_BIOD, NULL) < 0) {
 156                                 syslog(LOG_ERR, "nfssvc: %m");
 157                                 exit (1);
 158                         }
 159                         exit(0);
 160                 }
 161         exit (0);
 162 }
 163
 164 void
 165 nonfs(signo)
 166         int signo;
 167 {
 168         syslog(LOG_ERR, "missing system call: NFS not available.");
 169 }
 170
 171 void
 172 reapchild(signo)
 173         int signo;
 174 {
 175
 176         while (wait3(NULL, WNOHANG, NULL));
 177 }
 178
 179 void
 180 usage()
 181 {
 182         (void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n");
 183         exit(1);
 184 }