/*
* T T C P . C
*
* Test TCP connection. Makes a connection on port 5001
* and transfers fabricated buffers or data copied from stdin.
*
* Usable on 4.2, 4.3, and 4.1a systems by defining one of
* BSD42 BSD43 (BSD41a)
* Machines using System V with BSD sockets should define SYSV.
*
* Modified for operation under 4.2BSD, 18 Dec 84
* T.C. Slattery, USNA
* Minor improvements, Mike Muuss and Terry Slattery, 16-Oct-85.
* Modified in 1989 at Silicon Graphics, Inc.
* catch SIGPIPE to be able to print stats when receiver has died
* for tcp, don't look for sentinel during reads to allow small transfers
* increased default buffer size to 8K, nbuf to 2K to transfer 16MB
* moved default port to 5001, beyond IPPORT_USERRESERVED
* make sinkmode default because it is more popular,
* -s now means don't sink/source
* count number of read/write system calls to see effects of
* blocking from full socket buffers
* for tcp, -D option turns off buffered writes (sets TCP_NODELAY sockopt)
* buffer alignment options, -A and -O
* print stats in a format that's a bit easier to use with grep & awk
* for SYSV, mimic BSD routines to use most of the existing timing code
* Modified by Steve Miller of the University of Maryland, College Park
* -b sets the socket buffer size (SO_SNDBUF/SO_RCVBUF)
* Modified Sept. 1989 at Silicon Graphics, Inc.
* restored -s sense at request of tcs@brl
* Modified Oct. 1991 at Silicon Graphics, Inc.
* use getopt(3) for option processing, add -f and -T options.
* SGI IRIX 3.3 and 4.0 releases don't need #define SYSV.
*
* Distribution Status -
* Public Domain. Distribution Unlimited.
*/
#ifndef lint
/* static char RCSid[] = "ttcp.c $Revision$"; */
#endif
#define BSD43
/* #define BSD42 */
/* #define BSD41a */
/* #define SYSV */ /* required on SGI IRIX releases before 3.3 */
#define ENABLE_NANOSLEEP_DELAY
#include <stdio.h>
#include <signal.h>
#include <ctype.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <string.h>
#include <sys/time.h> /* struct timeval */
#include <unistd.h>
#include <stdlib.h>
#if defined(SYSV)
#include <sys/times.h>
#include <sys/param.h>
struct rusage {
struct timeval ru_utime, ru_stime;
};
#define RUSAGE_SELF 0
#else
#include <sys/resource.h>
#endif
struct sockaddr_in sinme;
struct sockaddr_in sinhim;
struct sockaddr_in frominet;
/* these make it easier to avoid warnings */
struct sockaddr *sinhim_p = (struct sockaddr *) &sinhim;
struct sockaddr *sinme_p = (struct sockaddr *) &sinme;
struct sockaddr *frominet_p = (struct sockaddr *) &frominet;
int domain;
socklen_t fromlen;
int fd; /* fd of network socket */
int buflen = 8 * 1024; /* length of buffer */
char *buf; /* ptr to dynamic buffer */
int nbuf = 2 * 1024; /* number of buffers to send in sinkmode */
int bufoffset = 0; /* align buffer to this */
int bufalign = 16*1024; /* modulo this */
int udp = 0; /* 0 = tcp, !0 = udp */
int options = 0; /* socket options */
int one = 1; /* for 4.3 BSD style setsockopt() */
short port = 5001; /* TCP port number */
char *host; /* ptr to name of host */
int trans; /* 0=receive, !0=transmit mode */
int sinkmode = 0; /* 0=normal I/O, !0=sink/source mode */
int verbose = 0; /* 0=print basic info, 1=print cpu rate, proc
* resource usage. */
int nodelay = 0; /* set TCP_NODELAY socket option */
int b_flag = 0; /* use mread() */
int sockbufsize = 0; /* socket buffer size to use */
char fmt = 'K'; /* output format: k = kilobits, K = kilobytes,
* m = megabits, M = megabytes,
* g = gigabits, G = gigabytes */
int touchdata = 0; /* access data after reading */
long milliseconds = 0; /* delay in milliseconds */
struct hostent *addr;
extern int errno;
extern int optind;
extern char *optarg;
char Usage[] = "\
Usage: ttcp -t [-options] host [ < in ]\n\
ttcp -r [-options > out]\n\
Common options:\n\
-l ## length of bufs read from or written to network (default 8192)\n\
-u use UDP instead of TCP\n\
-p ## port number to send to or listen at (default 5001)\n\
-s -t: source a pattern to network\n\
-r: sink (discard) all data from network\n\
-A align the start of buffers to this modulus (default 16384)\n\
-O start buffers at this offset from the modulus (default 0)\n\
-v verbose: print more statistics\n\
-d set SO_DEBUG socket option\n\
-b ## set socket buffer size (if supported)\n\
-f X format for rate: k,K = kilo{bit,byte}; m,M = mega; g,G = giga\n\
Options specific to -t:\n\
-n## number of source bufs written to network (default 2048)\n\
-D don't buffer TCP writes (sets TCP_NODELAY socket option)\n\
Options specific to -r:\n\
-B for -s, only output full blocks as specified by -l (for TAR)\n\
-T \"touch\": access each byte as it's read\n\
-m ## delay for specified milliseconds between each write\n\
";
char stats[128];
double nbytes; /* bytes on net */
unsigned long numCalls; /* # of I/O system calls */
double cput, realt; /* user, real time (seconds) */
void err();
void mes();
void pattern();
void prep_timer();
double read_timer();
int Nread();
int Nwrite();
void delay();
int mread();
char *outfmt();
void
sigpipe()
{
}
void millisleep(long msec)
{
#if defined(ENABLE_NANOSLEEP_DELAY)
struct timespec req;
req.tv_sec = msec / 1000;
req.tv_nsec = (msec % 1000) * 1000000;
nanosleep( &req, NULL );
#endif
}
int main(argc,argv)
int argc;
char **argv;
{
unsigned long addr_tmp;
int c;
if (argc < 2) goto usage;
while ((c = getopt(argc, argv, "drstuvBDTb:f:l:m:n:p:A:O:")) != -1) {
switch (c) {
case 'B':
b_flag = 1;
break;
case 't':
trans = 1;
break;
case 'r':
trans = 0;
break;
case 'd':
options |= SO_DEBUG;
break;
case 'D':
#ifdef TCP_NODELAY
nodelay = 1;
#else
fprintf(stderr,
"ttcp: -D option ignored: TCP_NODELAY socket option not supported\n");
#endif
break;
case 'm':
milliseconds = atoi(optarg);
#if !defined(ENABLE_NANOSLEEP_DELAY)
fprintf(stderr, "millisecond delay disabled\n");
#endif
break;
case 'n':
nbuf = atoi(optarg);
break;
case 'l':
buflen = atoi(optarg);
break;
case 's':
sinkmode = !sinkmode;
break;
case 'p':
port = atoi(optarg);
break;
case 'u':
udp = 1;
break;
case 'v':
verbose = 1;
break;
case 'A':
bufalign = atoi(optarg);
break;
case 'O':
bufoffset = atoi(optarg);
break;
case 'b':
#if defined(SO_SNDBUF) || defined(SO_RCVBUF)
sockbufsize = atoi(optarg);
#else
fprintf(stderr,
"ttcp: -b option ignored: SO_SNDBUF/SO_RCVBUF socket options not supported\n");
#endif
break;
case 'f':
fmt = *optarg;
break;
case 'T':
touchdata = 1;
break;
default:
goto usage;
}
}
if(trans) {
/* xmitr */
if (optind == argc)
goto usage;
bzero((char *)&sinhim, sizeof(sinhim));
host = argv[optind];
if (atoi(host) > 0 ) {
/* Numeric */
sinhim.sin_family = AF_INET;
#if defined(cray)
addr_tmp = inet_addr(host);
sinhim.sin_addr = addr_tmp;
#else
sinhim.sin_addr.s_addr = inet_addr(host);
#endif
} else {
if ((addr=gethostbyname(host)) == NULL)
err("bad hostname");
sinhim.sin_family = addr->h_addrtype;
bcopy(addr->h_addr,(char*)&addr_tmp, addr->h_length);
#if defined(cray)
sinhim.sin_addr = addr_tmp;
#else
sinhim.sin_addr.s_addr = addr_tmp;
#endif /* cray */
}
sinhim.sin_port = htons(port);
sinme.sin_port = 0; /* free choice */
} else {
/* rcvr */
sinme.sin_port = htons(port);
}
if (udp && buflen < 5) {
buflen = 5; /* send more than the sentinel size */
}
if ( (buf = (char *)malloc(buflen+bufalign)) == (char *)NULL)
err("malloc");
if (bufalign != 0)
buf +=(bufalign - ((int)buf % bufalign) + bufoffset) % bufalign;
if (trans) {
fprintf(stdout,
"ttcp-t: buflen=%d, nbuf=%d, align=%d/%d, port=%d",
buflen, nbuf, bufalign, bufoffset, port);
if (sockbufsize)
fprintf(stdout, ", sockbufsize=%d", sockbufsize);
fprintf(stdout, " %s -> %s\n", udp?"udp":"tcp", host);
} else {
fprintf(stdout,
"ttcp-r: buflen=%d, nbuf=%d, align=%d/%d, port=%d",
buflen, nbuf, bufalign, bufoffset, port);
if (sockbufsize)
fprintf(stdout, ", sockbufsize=%d", sockbufsize);
fprintf(stdout, " %s\n", udp?"udp":"tcp");
}
if ((fd = socket(AF_INET, udp?SOCK_DGRAM:SOCK_STREAM, 0)) < 0)
err("socket");
mes("socket");
if (bind(fd, sinme_p, sizeof(sinme)) < 0)
err("bind");
#if defined(SO_SNDBUF) || defined(SO_RCVBUF)
if (sockbufsize) {
if (trans) {
if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &sockbufsize,
sizeof sockbufsize) < 0)
err("setsockopt: sndbuf");
mes("sndbuf");
} else {
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &sockbufsize,
sizeof sockbufsize) < 0)
err("setsockopt: rcvbuf");
mes("rcvbuf");
}
}
#endif
if (!udp) {
#if !defined(__rtems__)
signal(SIGPIPE, sigpipe);
#endif
if (trans) {
/* We are the client if transmitting */
if (options) {
#if defined(BSD42)
if( setsockopt(fd, SOL_SOCKET, options, 0, 0) < 0)
#else /* BSD43 */
if( setsockopt(fd, SOL_SOCKET, options, &one, sizeof(one)) < 0)
#endif
err("setsockopt");
}
#ifdef TCP_NODELAY
if (nodelay) {
struct protoent *p;
p = getprotobyname("tcp");
if( p && setsockopt(fd, p->p_proto, TCP_NODELAY,
&one, sizeof(one)) < 0)
err("setsockopt: nodelay");
mes("nodelay");
}
#endif
if(connect(fd, sinhim_p, sizeof(sinhim) ) < 0)
err("connect");
mes("connect");
} else {
/* otherwise, we are the server and
* should listen for the connections
*/
#if defined(ultrix) || defined(sgi)
listen(fd,1); /* workaround for alleged u4.2 bug */
#else
listen(fd,0); /* allow a queue of 0 */
#endif
if(options) {
#if defined(BSD42)
if( setsockopt(fd, SOL_SOCKET, options, 0, 0) < 0)
#else /* BSD43 */
if( setsockopt(fd, SOL_SOCKET, options, &one, sizeof(one)) < 0)
#endif
err("setsockopt");
}
fromlen = sizeof(frominet);
domain = AF_INET;
if((fd=accept(fd, frominet_p, &fromlen) ) < 0)
err("accept");
{ struct sockaddr_in peer;
socklen_t peerlen = sizeof(peer);
if (getpeername(fd, (struct sockaddr *) &peer,
&peerlen) < 0) {
err("getpeername");
}
fprintf(stderr,"ttcp-r: accept from %s\n",
inet_ntoa(peer.sin_addr));
}
}
}
prep_timer();
errno = 0;
if (sinkmode) {
register int cnt;
if (trans) {
pattern( buf, buflen );
if(udp) (void)Nwrite( fd, buf, 4 ); /* rcvr start */
while (nbuf-- && Nwrite(fd,buf,buflen) == buflen) {
nbytes += buflen;
millisleep( milliseconds );
}
if(udp) (void)Nwrite( fd, buf, 4 ); /* rcvr end */
} else {
if (udp) {
while ((cnt=Nread(fd,buf,buflen)) > 0) {
static int going = 0;
if( cnt <= 4 ) {
if( going )
break; /* "EOF" */
going = 1;
prep_timer();
} else {
nbytes += cnt;
}
}
} else {
while ((cnt=Nread(fd,buf,buflen)) > 0) {
nbytes += cnt;
}
}
}
} else {
register int cnt;
if (trans) {
while((cnt=read(0,buf,buflen)) > 0 &&
Nwrite(fd,buf,cnt) == cnt)
nbytes += cnt;
} else {
while((cnt=Nread(fd,buf,buflen)) > 0 &&
write(1,buf,cnt) == cnt)
nbytes += cnt;
}
}
if(errno) err("IO");
(void)read_timer(stats,sizeof(stats));
if(udp&&trans) {
(void)Nwrite( fd, buf, 4 ); /* rcvr end */
(void)Nwrite( fd, buf, 4 ); /* rcvr end */
(void)Nwrite( fd, buf, 4 ); /* rcvr end */
(void)Nwrite( fd, buf, 4 ); /* rcvr end */
}
if( cput <= 0.0 ) cput = 0.001;
if( realt <= 0.0 ) realt = 0.001;
fprintf(stdout,
"ttcp%s: %.0f bytes in %.2f real seconds = %s/sec +++\n",
trans?"-t":"-r",
nbytes, realt, outfmt(nbytes/realt));
if (verbose) {
fprintf(stdout,
"ttcp%s: %.0f bytes in %.2f CPU seconds = %s/cpu sec\n",
trans?"-t":"-r",
nbytes, cput, outfmt(nbytes/cput));
}
fprintf(stdout,
"ttcp%s: %ld 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 %p\n",
trans?"-t":"-r",
buf);
}
exit(0);
usage:
fprintf(stderr,Usage);
exit(1);
return 0;
}
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);
}
void 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;
int len;
{
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,"%ld.%01ld", tdiff.tv_sec, tdiff.tv_usec/100000);
END(outp);
break;
case 'S':
tvsub(&tdiff, &r1->ru_stime, &r0->ru_stime);
sprintf(outp,"%ld.%01ld", 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,"%ld", t == 0 ? 0 : (r1->ru_ixrss-r0->ru_ixrss)/t);
END(outp);
break;
case 'D':
sprintf(outp,"%ld", t == 0 ? 0 :
(r1->ru_idrss+r1->ru_isrss-(r0->ru_idrss+r0->ru_isrss))/t);
END(outp);
break;
case 'K':
sprintf(outp,"%ld", 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
*/
int Nread( fd, buf, count )
int fd;
void *buf;
int count;
{
struct sockaddr_in from;
socklen_t len = sizeof(from);
register int cnt;
if( udp ) {
cnt = recvfrom( fd, buf, count, 0, (struct sockaddr *)&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
*/
int Nwrite( fd, buf, count )
int fd;
void *buf;
int count;
{
register int cnt;
if( udp ) {
again:
cnt = sendto( fd, buf, count, 0, sinhim_p, sizeof(sinhim) );
numCalls++;
if( cnt<0 && errno == ENOBUFS ) {
printf("ttcp: out of buffers -- delaying\n"); /*JRS*/
delay(18000);
errno = 0;
goto again;
}
} else {
cnt = write( fd, buf, count );
numCalls++;
}
return(cnt);
}
void
delay(int us)
{
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = us;
(void)select( 1, (fd_set *)0, (fd_set *)0, (fd_set *)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);
}
