ttcp.c

网络驱动开发

		nbytes, cput, outfmt(nbytes/cput));
	}
	fprintf(stdout,
		"ttcp%s: %d I/O calls, msec/call = %.2f, calls/sec = %.2f\n",
		trans?"-t":"-r",
		numCalls,
		1024.0 * realt/((double)numCalls),
		((double)numCalls)/realt);
	fprintf(stdout,"ttcp%s: %s\n", trans?"-t":"-r", stats);
	if (verbose) {
	    fprintf(stdout,
		"ttcp%s: buffer address %#x\n",
		trans?"-t":"-r",
		buf);
	}
	exit(0);

usage:
	fprintf(stderr,Usage);
	exit(1);
}

void
err(s)
char *s;
{
	fprintf(stderr,"ttcp%s: ", trans?"-t":"-r");
	perror(s);
	fprintf(stderr,"errno=%d\n",errno);
	exit(1);
}

void
mes(s)
char *s;
{
	fprintf(stderr,"ttcp%s: %s\n", trans?"-t":"-r", s);
}

pattern( cp, cnt )
register char *cp;
register int cnt;
{
	register char c;
	c = 0;
	while( cnt-- > 0 )  {
		while( !isprint((c&0x7F)) )  c++;
		*cp++ = (c++&0x7F);
	}
}

char *
outfmt(b)
double b;
{
    static char obuf[50];
    switch (fmt) {
	case 'G':
	    sprintf(obuf, "%.2f GB", b / 1024.0 / 1024.0 / 1024.0);
	    break;
	default:
	case 'K':
	    sprintf(obuf, "%.2f KB", b / 1024.0);
	    break;
	case 'M':
	    sprintf(obuf, "%.2f MB", b / 1024.0 / 1024.0);
	    break;
	case 'g':
	    sprintf(obuf, "%.2f Gbit", b * 8.0 / 1024.0 / 1024.0 / 1024.0);
	    break;
	case 'k':
	    sprintf(obuf, "%.2f Kbit", b * 8.0 / 1024.0);
	    break;
	case 'm':
	    sprintf(obuf, "%.2f Mbit", b * 8.0 / 1024.0 / 1024.0);
	    break;
    }
    return obuf;
}

static struct	timeval time0;	/* Time at which timing started */
static struct	rusage ru0;	/* Resource utilization at the start */

static void prusage();
static void tvadd();
static void tvsub();
static void psecs();

#if defined(SYSV)
/*ARGSUSED*/
static
getrusage(ignored, ru)
    int ignored;
    register struct rusage *ru;
{
    struct tms buf;

    times(&buf);

    /* Assumption: HZ <= 2147 (LONG_MAX/1000000) */
    ru->ru_stime.tv_sec  = buf.tms_stime / HZ;
    ru->ru_stime.tv_usec = ((buf.tms_stime % HZ) * 1000000) / HZ;
    ru->ru_utime.tv_sec  = buf.tms_utime / HZ;
    ru->ru_utime.tv_usec = ((buf.tms_utime % HZ) * 1000000) / HZ;
}

/*ARGSUSED*/
static 
gettimeofday(tp, zp)
    struct timeval *tp;
    struct timezone *zp;
{
    tp->tv_sec = time(0);
    tp->tv_usec = 0;
}
#endif /* SYSV */

/*
 *			P R E P _ T I M E R
 */
void
prep_timer()
{
	gettimeofday(&time0, (struct timezone *)0);
	getrusage(RUSAGE_SELF, &ru0);
}

/*
 *			R E A D _ T I M E R
 * 
 */
double
read_timer(str,len)
char *str;
{
	struct timeval timedol;
	struct rusage ru1;
	struct timeval td;
	struct timeval tend, tstart;
	char line[132];

	getrusage(RUSAGE_SELF, &ru1);
	gettimeofday(&timedol, (struct timezone *)0);
	prusage(&ru0, &ru1, &timedol, &time0, line);
	(void)strncpy( str, line, len );

	/* Get real time */
	tvsub( &td, &timedol, &time0 );
	realt = td.tv_sec + ((double)td.tv_usec) / 1000000;

	/* Get CPU time (user+sys) */
	tvadd( &tend, &ru1.ru_utime, &ru1.ru_stime );
	tvadd( &tstart, &ru0.ru_utime, &ru0.ru_stime );
	tvsub( &td, &tend, &tstart );
	cput = td.tv_sec + ((double)td.tv_usec) / 1000000;
	if( cput < 0.00001 )  cput = 0.00001;
	return( cput );
}

static void
prusage(r0, r1, e, b, outp)
	register struct rusage *r0, *r1;
	struct timeval *e, *b;
	char *outp;
{
	struct timeval tdiff;
	register time_t t;
	register char *cp;
	register int i;
	int ms;

	t = (r1->ru_utime.tv_sec-r0->ru_utime.tv_sec)*100+
	    (r1->ru_utime.tv_usec-r0->ru_utime.tv_usec)/10000+
	    (r1->ru_stime.tv_sec-r0->ru_stime.tv_sec)*100+
	    (r1->ru_stime.tv_usec-r0->ru_stime.tv_usec)/10000;
	ms =  (e->tv_sec-b->tv_sec)*100 + (e->tv_usec-b->tv_usec)/10000;

#define END(x)	{while(*x) x++;}
#if defined(SYSV)
	cp = "%Uuser %Ssys %Ereal %P";
#else
#if defined(sgi)		/* IRIX 3.3 will show 0 for %M,%F,%R,%C */
	cp = "%Uuser %Ssys %Ereal %P %Mmaxrss %F+%Rpf %Ccsw";
#else
	cp = "%Uuser %Ssys %Ereal %P %Xi+%Dd %Mmaxrss %F+%Rpf %Ccsw";
#endif
#endif
	for (; *cp; cp++)  {
		if (*cp != '%')
			*outp++ = *cp;
		else if (cp[1]) switch(*++cp) {

		case 'U':
			tvsub(&tdiff, &r1->ru_utime, &r0->ru_utime);
			sprintf(outp,"%d.%01d", tdiff.tv_sec, tdiff.tv_usec/100000);
			END(outp);
			break;

		case 'S':
			tvsub(&tdiff, &r1->ru_stime, &r0->ru_stime);
			sprintf(outp,"%d.%01d", tdiff.tv_sec, tdiff.tv_usec/100000);
			END(outp);
			break;

		case 'E':
			psecs(ms / 100, outp);
			END(outp);
			break;

		case 'P':
			sprintf(outp,"%d%%", (int) (t*100 / ((ms ? ms : 1))));
			END(outp);
			break;

#if !defined(SYSV)
		case 'W':
			i = r1->ru_nswap - r0->ru_nswap;
			sprintf(outp,"%d", i);
			END(outp);
			break;

		case 'X':
			sprintf(outp,"%d", t == 0 ? 0 : (r1->ru_ixrss-r0->ru_ixrss)/t);
			END(outp);
			break;

		case 'D':
			sprintf(outp,"%d", t == 0 ? 0 :
			    (r1->ru_idrss+r1->ru_isrss-(r0->ru_idrss+r0->ru_isrss))/t);
			END(outp);
			break;

		case 'K':
			sprintf(outp,"%d", t == 0 ? 0 :
			    ((r1->ru_ixrss+r1->ru_isrss+r1->ru_idrss) -
			    (r0->ru_ixrss+r0->ru_idrss+r0->ru_isrss))/t);
			END(outp);
			break;

		case 'M':
			sprintf(outp,"%d", r1->ru_maxrss/2);
			END(outp);
			break;

		case 'F':
			sprintf(outp,"%d", r1->ru_majflt-r0->ru_majflt);
			END(outp);
			break;

		case 'R':
			sprintf(outp,"%d", r1->ru_minflt-r0->ru_minflt);
			END(outp);
			break;

		case 'I':
			sprintf(outp,"%d", r1->ru_inblock-r0->ru_inblock);
			END(outp);
			break;

		case 'O':
			sprintf(outp,"%d", r1->ru_oublock-r0->ru_oublock);
			END(outp);
			break;
		case 'C':
			sprintf(outp,"%d+%d", r1->ru_nvcsw-r0->ru_nvcsw,
				r1->ru_nivcsw-r0->ru_nivcsw );
			END(outp);
			break;
#endif /* !SYSV */
		}
	}
	*outp = '\0';
}

static void
tvadd(tsum, t0, t1)
	struct timeval *tsum, *t0, *t1;
{

	tsum->tv_sec = t0->tv_sec + t1->tv_sec;
	tsum->tv_usec = t0->tv_usec + t1->tv_usec;
	if (tsum->tv_usec > 1000000)
		tsum->tv_sec++, tsum->tv_usec -= 1000000;
}

static void
tvsub(tdiff, t1, t0)
	struct timeval *tdiff, *t1, *t0;
{

	tdiff->tv_sec = t1->tv_sec - t0->tv_sec;
	tdiff->tv_usec = t1->tv_usec - t0->tv_usec;
	if (tdiff->tv_usec < 0)
		tdiff->tv_sec--, tdiff->tv_usec += 1000000;
}

static void
psecs(l,cp)
long l;
register char *cp;
{
	register int i;

	i = l / 3600;
	if (i) {
		sprintf(cp,"%d:", i);
		END(cp);
		i = l % 3600;
		sprintf(cp,"%d%d", (i/60) / 10, (i/60) % 10);
		END(cp);
	} else {
		i = l;
		sprintf(cp,"%d", i / 60);
		END(cp);
	}
	i %= 60;
	*cp++ = ':';
	sprintf(cp,"%d%d", i / 10, i % 10);
}

/*
 *			N R E A D
 */
Nread( fd, buf, count )
int fd;
void *buf;
int count;
{
	struct sockaddr_in from;
	int len = sizeof(from);
	register int cnt;
	if( udp )  {
		cnt = recvfrom( fd, buf, count, 0, &from, &len );
		numCalls++;
	} else {
		if( b_flag )
			cnt = mread( fd, buf, count );	/* fill buf */
		else {
			cnt = read( fd, buf, count );
			numCalls++;
		}
		if (touchdata && cnt > 0) {
			register int c = cnt, sum;
			register char *b = buf;
			while (c--)
				sum += *b++;
		}
	}
	return(cnt);
}

/*
 *			N W R I T E
 */
Nwrite( fd, buf, count )
int fd;
void *buf;
int count;
{
	register int cnt;
	if( udp )  {
again:
		cnt = sendto( fd, buf, count, 0, &sinhim, sizeof(sinhim) );
		numCalls++;
		if( cnt<0 && errno == ENOBUFS )  {
			delay(18000);
			errno = 0;
			goto again;
		}
	} else {
		cnt = write( fd, buf, count );
		numCalls++;
	}
	return(cnt);
}

void
delay(us)
{
	struct timeval tv;

	tv.tv_sec = 0;
	tv.tv_usec = us;
	(void)select( 1, (char *)0, (char *)0, (char *)0, &tv );
}

/*
 *			M R E A D
 *
 * This function performs the function of a read(II) but will
 * call read(II) multiple times in order to get the requested
 * number of characters.  This can be necessary because
 * network connections don't deliver data with the same
 * grouping as it is written with.  Written by Robert S. Miles, BRL.
 */
int
mread(fd, bufp, n)
int fd;
register char	*bufp;
unsigned	n;
{
	register unsigned	count = 0;
	register int		nread;

	do {
		nread = read(fd, bufp, n-count);
		numCalls++;
		if(nread < 0)  {
			perror("ttcp_mread");
			return(-1);
		}
		if(nread == 0)
			return((int)count);
		count += (unsigned)nread;
		bufp += nread;
	 } while(count < n);

	return((int)count);
}