/*
* 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.
*
* Modified Jul 2001 by Pekka Savola <
[email protected]>
* implement full IPv6 support (server uses ipv6 mapped addresses for ipv4)
* fix a few warnings (from *BSD)
* fix loads of more warnings
* use snprintf with a few fixed-sized buffers, fix format strings
*
* Modified Oct 2001 by Jaakko Kyr� <
[email protected]>
* Added -I option to specify network interface
*
* Modified Oct 2002 by Pekka Savola <
[email protected]>
* fix port selection for >2^15
* clean out _cray, sysv etc. cruft, always build with IPv6
* major cleanups, should be a bit more readable now
*
* Modified Oct 2002 by Stig Venaas <
[email protected]>
* added multicast support
* added -w option to specify microsecond delay between each write
* further cleanups
*
* Modified Oct 2002 by Pekka Savola <
[email protected]>
* made one variable 'static' to fix compilation on Solaris from <
[email protected]>
*
* Modified Aug 2004 by Stig Venaas <
[email protected]>
* Binding to group address when receiving multicast
* Added SO_REUSEADDR so multiple processes can listen to same port
*
* Modified Dec 2007 by Pekka Savola <
[email protected]>
* Add error/warning message fixes from Niklas Edmundsson
* Some other cleanups as well.
*
* Distribution Status -
* Public Domain. Distribution Unlimited.
*/
#ifndef lint
static const char RCSid[] = "ttcp.c $Revision: 1.12 $";
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h> /* struct timeval */
#include <sys/resource.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
struct sockaddr_storage frominet;
struct addrinfo hints, *res, *res0;
struct ipv6_mreq mreq6;
struct ip_mreq mreq;
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() */
char *port = "5001"; /* TCP/UDP 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 */
static long wrwait = 0; /* usecs to wait between each write */
int af = AF_UNSPEC; /* Address family to be determined */
extern int errno;
extern int optind;
extern char *optarg;
char Usage[] = "\
Usage: ttcp -t [-options] host [ < in ]\n\
ttcp -r [-options] [multicast-group][ > out]\n\
Common options:\n\
-4 use IPv4\n\
-6 use IPv6\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\
-w ## number of microseconds to wait between each write\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\
-I if Specify the network interface (e.g. eth0) to use\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();
int
main(int argc, char **argv)
{
char *device = NULL;
int maf = 0; /* Address family if multicast, else 0 */
int c;
if (argc < 2) goto usage;
while ((c = getopt(argc, argv, "46drstuvBDTb:f:l:n:p:w:A:O:I:")) != -1) {
switch (c) {
case '4':
af = AF_INET;
break;
case '6':
af = AF_INET6;
break;
case 'I':
device = optarg;
break;
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 'n':
nbuf = atoi(optarg);
break;
case 'l':
buflen = atoi(optarg);
break;
case 's':
sinkmode = !sinkmode;
break;
case 'p':
port = optarg;
break;
case 'u':
udp = 1;
break;
case 'v':
verbose = 1;
break;
case 'w':
wrwait = strtol(optarg, (char **)NULL, 10);
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;
}
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
hints.ai_socktype = udp ? SOCK_DGRAM : SOCK_STREAM;
if (trans) {
/* xmitr */
if (optind == argc)
goto usage;
host = argv[optind];
if (getaddrinfo(host, port, &hints, &res) != 0) {
fprintf(stderr, "can't resolve %s port %s\n", host, port);
exit(1);
}
if (udp) {
/* Check if multicast address */
if (res->ai_family == AF_INET6) {
if (IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)
res->ai_addr)->sin6_addr)) {
maf = AF_INET6;
}
} else if (res->ai_family == AF_INET) {
if (IN_MULTICAST(ntohl(((struct sockaddr_in *)
res->ai_addr)->sin_addr.s_addr))) {
maf = AF_INET;
}
}
}
} else {
/* rcvr */
if (udp && optind < argc) {
if (inet_pton(AF_INET, argv[optind], &mreq.imr_multiaddr) <= 0) {
if (inet_pton(AF_INET6, argv[optind], &mreq6.ipv6mr_multiaddr) <= 0) {
fprintf(stderr, "%s is not a multicast address\n", argv[optind]);
exit(1);
}
/* IPv6 */
if (!IN6_IS_ADDR_MULTICAST(&mreq6.ipv6mr_multiaddr)) {
fprintf(stderr, "%s is not a multicast address\n", argv[optind]);
exit(1);
}
hints.ai_family = AF_INET6;
maf = AF_INET6;
mreq6.ipv6mr_interface = 0;
} else {
/* IPv4 */
if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
fprintf(stderr, "%s is not a multicast address\n", argv[optind]);
exit(1);
}
hints.ai_family = AF_INET;
maf = AF_INET;
mreq.imr_interface.s_addr = INADDR_ANY;
}
host = argv[optind];
hints.ai_flags = AI_NUMERICHOST;
} else {
host = NULL;
hints.ai_flags = AI_PASSIVE;
}
if (getaddrinfo(host, port, &hints, &res0) != 0) {
fprintf(stderr, "can't resolve %s\n", port);
exit(1);
}
/* if libc supports ipv6 but kernel doesn't: get the first one */
/* XXX: uses ipv6 mapped addresses as generic methods aren't there yet */
for (res = res0; res; res = res->ai_next) {
if ((fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) > 0)
break;
}
}
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 - ((long)buf % bufalign) + bufoffset) % bufalign;
if (trans) {
fprintf(stderr, "ttcp-t: buflen=%d, nbuf=%d, align=%d/%d, port=%s",
buflen, nbuf, bufalign, bufoffset, port);
if (sockbufsize)
fprintf(stderr, ", sockbufsize=%d", sockbufsize);
fprintf(stderr, " %s -> %s\n", udp ? "udp" : "tcp", host);
} else {
fprintf(stderr, "ttcp-r: buflen=%d, nbuf=%d, align=%d/%d, port=%s",
buflen, nbuf, bufalign, bufoffset, port);
if (sockbufsize)
fprintf(stderr, ", sockbufsize=%d", sockbufsize);
fprintf(stderr, " %s\n", udp ? "udp" : "tcp");
}
if (!fd) {
if ((fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) < 0)
err("socket");
}
if (device) {
if (maf == AF_INET) {
/* Not supported, using struct ip_mreq we need to find IP
* address of interface, at least linux has ip_mreqn which
* uses interface index
*/
} else if (maf == AF_INET6) {
if ((mreq6.ipv6mr_interface = if_nametoindex(device)) == 0) {
err("unknown device");
}
} else {
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, device, IFNAMSIZ-1);
ifr.ifr_name[IFNAMSIZ-1] = '\0';
#ifdef SO_BINDTODEVICE
if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr,sizeof(ifr)) == -1) {
err("bind-to-device");
}
#else
fprintf(stderr, "ttcp: warning: setting device not supported!\n");
#endif
}
}
mes("socket");
if (maf == AF_INET) {
if (trans) {
/* set hop limit, default 1. Should perhaps be an option */
int ttl=30;
setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, (char *)&ttl, sizeof(ttl));
} else {
/* join the group */
setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
}
} else if (maf == AF_INET6) {
if (trans) {
/* set hop limit, default 1. Should perhaps be an option */
int hops=30;
setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, (char *)&hops, sizeof(hops));
} else {
/* join the group */
setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6, sizeof(mreq6));
}
}
if (!trans) {
#ifdef SO_REUSEADDR
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) == -1)
err("reuseaddr");
#endif
if (bind(fd, res->ai_addr, res->ai_addrlen) < 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) {
signal(SIGPIPE, SIG_IGN);
if (trans) {
/* We are the client if transmitting */
if (options) {
if (setsockopt(fd, SOL_SOCKET, options, &one, sizeof(one)) < 0)
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, res->ai_addr, res->ai_addrlen) < 0)
err("connect");
mes("connect");
} else {
/* otherwise, we are the server and
* should listen for the connections
*/
listen(fd, 0); /* allow a queue of 0 */
if (options) {
if (setsockopt(fd, SOL_SOCKET, options, &one, sizeof(one)) < 0)
err("setsockopt");
}
fromlen = sizeof(frominet);
if ((fd = accept(fd, (struct sockaddr*)&frominet, &fromlen)) < 0)
err("accept");
{
struct sockaddr_storage peer;
char addr_buf[NI_MAXHOST];
socklen_t peerlen = sizeof(peer);
if (getpeername(fd, (struct sockaddr*) &peer, &peerlen) < 0)
err("getpeername");
if (getnameinfo((struct sockaddr *) &peer, res->ai_addrlen, addr_buf,
sizeof(addr_buf), NULL, 0, NI_NUMERICHOST))
err("getnameinfo");
fprintf(stderr,"ttcp-r: accept from %s\n", addr_buf);
}
}
}
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;
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(stderr,
"ttcp%s: %.0f bytes in %.2f real seconds = %s/sec +++\n",
trans ? "-t" : "-r",
nbytes, realt, outfmt(nbytes/realt));
if (verbose) {
fprintf(stderr,
"ttcp%s: %.0f bytes in %.2f CPU seconds = %s/cpu sec\n",
trans ? "-t" : "-r",
nbytes, cput, outfmt(nbytes/cput));
}
fprintf(stderr,
"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(stderr, "ttcp%s: %s\n", trans ? "-t" : "-r", stats);
if (verbose) {
fprintf(stderr,
"ttcp%s: buffer address %p\n",
trans ? "-t" : "-r",
buf);
}
exit(0);
usage:
fprintf(stderr, "%s", Usage);
exit(1);
}
void
err(char *s)
{
fprintf(stderr, "ttcp%s: ", trans ? "-t" : "-r");
perror(s);
fprintf(stderr, "errno=%d\n", errno);
exit(1);
}
void
mes(char *s)
{
fprintf(stderr, "ttcp%s: %s\n", trans ? "-t" : "-r", s);
}
void
pattern(register char *cp, register int cnt)
{
register char c;
c = 0;
while (cnt-- > 0) {
while (!isprint((c&0x7F))) c++;
*cp++ = (c++&0x7F);
}
}
char *
outfmt(double b)
{
static char obuf[50];
switch (fmt) {
case 'G':
snprintf(obuf, sizeof(obuf), "%.2f GB", b / 1024.0 / 1024.0 / 1024.0);
break;
default:
case 'K':
snprintf(obuf, sizeof(obuf), "%.2f KB", b / 1024.0);
break;
case 'M':
snprintf(obuf, sizeof(obuf), "%.2f MB", b / 1024.0 / 1024.0);
break;
case 'g':
snprintf(obuf, sizeof(obuf), "%.2f Gbit", b * 8.0 / 1024.0 / 1024.0 / 1024.0);
break;
case 'k':
snprintf(obuf, sizeof(obuf), "%.2f Kbit", b * 8.0 / 1024.0);
break;
case 'm':
snprintf(obuf, sizeof(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();
/*
* 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(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);
/* XXX: buffer overflow if len > sizeof(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(register struct rusage *r0, register struct rusage *r1,
struct timeval *e, struct timeval *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++;}
cp = "%Uuser %Ssys %Ereal %P %Xi+%Dd %Mmaxrss %F+%Rpf %Ccsw";
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;
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, "%ld", r1->ru_maxrss/2);
END(outp);
break;
case 'F':
sprintf(outp, "%ld", r1->ru_majflt-r0->ru_majflt);
END(outp);
break;
case 'R':
sprintf(outp, "%ld", r1->ru_minflt-r0->ru_minflt);
END(outp);
break;
case 'I':
sprintf(outp, "%ld", r1->ru_inblock-r0->ru_inblock);
END(outp);
break;
case 'O':
sprintf(outp, "%ld", r1->ru_oublock-r0->ru_oublock);
END(outp);
break;
case 'C':
sprintf(outp, "%ld+%ld", r1->ru_nvcsw-r0->ru_nvcsw,
r1->ru_nivcsw-r0->ru_nivcsw );
END(outp);
break;
}
}
*outp = '\0';
}
static void
tvadd(struct timeval *tsum, struct timeval *t0, struct timeval *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(struct timeval *tdiff, struct timeval *t1, struct timeval *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(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(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 = 0;
register char *b = buf;
while (c--)
sum += *b++;
}
}
return(cnt);
}
/*
* N W R I T E
*/
int
Nwrite(int fd, void *buf, int count)
{
register int cnt;
if (udp) {
again:
cnt = sendto(fd, buf, count, 0, res->ai_addr, res->ai_addrlen);
numCalls++;
if (cnt<0 && errno == ENOBUFS) {
delay(18000);
errno = 0;
goto again;
}
} else {
cnt = write(fd, buf, count);
numCalls++;
}
if (wrwait)
delay(wrwait);
return(cnt);
}
void
delay(int us)
{
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = us;
(void)select(1, NULL, NULL, NULL, &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(int fd, register char *bufp, unsigned int 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);
}
