usr/src/sbin/nfsiod/nfsiod.c

/*
 * Copyright (c) 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
        The Regents of the University of California.  All rights reserved.\n";
#endif not lint

#ifndef lint
static char sccsid[] = "@(#)nfsiod.c    8.1 (Berkeley) %G%";
#endif not lint

#include <stdio.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/syslog.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sys/ucred.h>
#include <nfs/nfsv2.h>
#include <nfs/nfs.h>

/* Global defs */
#ifdef DEBUG
int debug = 1;
#else
int debug = 0;
#endif
extern int errno;
void reapchild();

/*
 * Nfsiod does asynchronous buffered I/O on behalf of the NFS client.
 * It does not have to be running for correct operation, but will improve
 * throughput. The one optional argument is the number of children to fork.
 */
main(argc, argv)
        int argc;
        char *argv[];
{
        register int i;
        int cnt;

        if (argc != 2 || (cnt = atoi(argv[1])) <= 0 || cnt > 20)
                cnt = 1;
        if (debug == 0) {
                daemon(0, 0);
                signal(SIGINT, SIG_IGN);
                signal(SIGQUIT, SIG_IGN);
                signal(SIGHUP, SIG_IGN);
        }
        signal(SIGCHLD, reapchild);
        openlog("nfsiod:", LOG_PID, LOG_DAEMON);
        for (i = 1; i < cnt; i++)
                if (fork() == 0)
                        break;
        if (nfssvc(NFSSVC_BIOD, (char *)0) < 0)
                syslog(LOG_ERR, "nfssvc failed %m");
}

void
reapchild()
{

        while (wait3((int *) NULL, WNOHANG, (struct rusage *) NULL))
                ;
}