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mbuffer.c
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mbuffer.c
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/*
* Copyright (C) 2000-2014, Thomas Maier-Komor
*
* This is the source code of mbuffer.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#ifdef S_SPLINT_S
typedef int caddr_t;
#include <sys/_types.h>
#include <cygwin/types.h>
#include <cygwin/in.h>
#endif
#define _GNU_SOURCE 1 /* needed for O_DIRECT */
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <float.h>
#include <libgen.h>
#include <limits.h>
#include <math.h>
#include <netdb.h>
#include <pthread.h>
#include <semaphore.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <termios.h>
#include <unistd.h>
#ifdef __FreeBSD__
#include <sys/sysctl.h>
#endif
#ifdef HAVE_SENDFILE
#ifdef HAVE_SENDFILE_H
#include <sys/sendfile.h>
#endif
#endif
#ifndef EBADRQC
#define EBADRQC EINVAL
#endif
#ifdef HAVE_LIBMHASH
#include <mhash.h>
#define HAVE_MD5 1
#elif defined HAVE_LIBMD5
#include <md5.h>
static MD5_CTX MD5ctxt;
#define MD5_INIT(ctxt) MD5Init(&ctxt);
#define MD5_UPDATE(ctxt,at,num) MD5Update(&ctxt,(unsigned char *)(at),(unsigned int)(num))
#define MD5_END(hash,ctxt) MD5Final(hash,&(ctxt))
#define HAVE_MD5 1
#elif defined HAVE_LIBCRYPTO
#include <openssl/md5.h>
static MD5_CTX MD5ctxt;
#define MD5_INIT(ctxt) MD5_Init(&ctxt);
#define MD5_UPDATE(ctxt,at,num) MD5_Update(&ctxt,at,num)
#define MD5_END(hash,ctxt) MD5_Final(hash,&(ctxt))
#define HAVE_MD5 1
#endif
/*
* _POSIX_THREADS is only defined if full thread support is available.
* We don't need full thread support, so we skip this test...
* #ifndef _POSIX_THREADS
* #error posix threads are required
* #endif
*/
#ifndef S_SPLINT_S
#ifndef _POSIX_SEMAPHORES
#error posix sempahores are required
#endif
#endif
#ifdef O_LARGEFILE
#define LARGEFILE O_LARGEFILE
#else
#define LARGEFILE 0
#endif
#ifdef O_DIRECT
#define DIRECT O_DIRECT
#else
#define DIRECT 0
#endif
#include "dest.h"
#include "network.h"
#include "log.h"
/* if this sendfile implementation does not support sending from buffers,
disable sendfile support */
#ifndef SFV_FD_SELF
#ifdef __GNUC__
#warning sendfile is unable to send from buffers
#endif
#undef HAVE_SENDFILE
#endif
char
*Prefix;
int
In = -1;
size_t
PrefixLen = 0;
static pthread_t
Reader, Watchdog;
static long
Tmp = -1,
OptSync = 0;
static unsigned long
Outsize = 10240, Pause = 0, Timeout = 0;
static volatile int
Terminate = 0, /* abort execution, because of error or signal */
EmptyCount = 0, /* counter incremented when buffer runs empty */
FullCount = 0, /* counter incremented when buffer gets full */
NumSenders = -1,/* number of sender threads */
Done = 0,
MainOutOK = 1; /* is the main outputThread still writing or just coordinating senders */
static unsigned long long
Totalmem = 0, PgSz = 0, NumP = 0, Blocksize = 10240,
MaxReadSpeed = 0, MaxWriteSpeed = 0, OutVolsize = 0;
static volatile unsigned long long
Rest = 0, Numin = 0, Numout = 0;
static double
StartWrite = 0, StartRead = 1;
static char
*Tmpfile = 0, **Buffer;
static const char
*Infile = 0, *AutoloadCmd = 0;
static unsigned int
AutoloadTime = 0;
static int
Memlock = 0, TermQ[2],
Memmap = 0, Quiet = 0, Status = 1, StatusLog = 1,
Hashers = 0, Direct = 0, SetOutsize = 0;
static long
NumVolumes = 1, /* number of input volumes, 0 for interactive prompting */
Finish = -1, /* this is for graceful termination */
Numblocks = 512; /* number of buffer blocks */
static long long
TickTime = 0;
#ifdef __sun
#include <synch.h>
#define sem_t sema_t
#define sem_init(a,b,c) sema_init(a,c,USYNC_THREAD,0)
#define sem_post sema_post
#define sem_getvalue(a,b) ((*(b) = (a)->count), 0)
#if defined(__SunOS_5_8) || defined(__SunOS_5_9)
#define sem_wait SemWait
int SemWait(sema_t *s)
{
int err;
do {
err = sema_wait(s);
} while (err == EINTR);
return err;
}
#else
#define sem_wait sema_wait
#endif
#endif
static sem_t Dev2Buf, Buf2Dev;
static pthread_cond_t
PercLow = PTHREAD_COND_INITIALIZER, /* low watermark */
PercHigh = PTHREAD_COND_INITIALIZER, /* high watermark */
SendCond = PTHREAD_COND_INITIALIZER;
static pthread_mutex_t
TermMut = PTHREAD_MUTEX_INITIALIZER, /* prevents statusThread from interfering with request*Volume */
LowMut = PTHREAD_MUTEX_INITIALIZER,
HighMut = PTHREAD_MUTEX_INITIALIZER,
SendMut = PTHREAD_MUTEX_INITIALIZER;
static int Terminal = 1, Autoloader = 0;
static struct timeval Starttime;
static dest_t *Dest = 0;
static char *volatile SendAt = 0;
static volatile int SendSize = 0, ActSenders = 0;
#ifdef __CYGWIN__
#include <malloc.h>
#undef assert
#define assert(x) ((x) || (*(char *) 0 = 1))
#endif
#ifdef __APPLE__
#include <mbuffer_darwin.h>
#endif
static clockid_t
ClockSrc = CLOCK_REALTIME;
static int kb2str(char *s, double v)
{
const char *dim = "KMGT", *f;
while (v > 10000.0) {
v /= 1024.0;
++dim;
if (*dim == 0) {
v *= 1024.0*1024.0*1024.0*1024.0;
break;
}
}
if (v < 0)
f = " ??? ";
else if (v < 100)
f = "%4.1f %ci";
else if (v < 10000) {
v = rint(v);
f = "%4.0f %ci";
} else
f = "%5.lg ";
return sprintf(s,f,v,*dim);
}
static void summary(unsigned long long numb, int numthreads)
{
int h,m;
double secs,av;
char buf[256], *msg = buf;
struct timeval now;
(void) gettimeofday(&now,0);
if (Status)
*msg++ = '\n';
if ((Terminate == 1) && (numthreads == 0))
numthreads = 1;
secs = now.tv_sec - Starttime.tv_sec + (double) now.tv_usec / 1000000 - (double) Starttime.tv_usec / 1000000;
assert(secs > 0);
numb >>= 10;
av = (double)(numb)/secs*numthreads;
h = (int) secs/3600;
m = (int) (secs - h * 3600)/60;
secs -= m * 60 + h * 3600;
if (numthreads > 1)
msg += sprintf(msg,"summary: %dx ",numthreads);
else
msg += sprintf(msg,"summary: ");
msg += kb2str(msg,numb);
msg += sprintf(msg,"Byte in ");
if (h > 0)
msg += sprintf(msg,"%dh %02dmin %04.1fsec - average of ",h,m,secs);
else if (m > 0)
msg += sprintf(msg,"%2dmin %04.1fsec - average of ",m,secs);
else
msg += sprintf(msg,"%4.1fsec - average of ",secs);
msg += kb2str(msg,av);
msg += sprintf(msg,"B/s");
if (EmptyCount != 0)
msg += sprintf(msg,", %dx empty",EmptyCount);
if (FullCount != 0)
msg += sprintf(msg,", %dx full",FullCount);
*msg++ = '\n';
*msg = '\0';
if (Log != STDERR_FILENO)
(void) write(Log,buf,msg-buf);
if (Status)
(void) write(STDERR_FILENO,buf,msg-buf);
}
static void cancelAll(void)
{
dest_t *d = Dest;
do {
(void) pthread_cancel(d->thread);
if (d->result == 0)
d->result = "canceled";
d = d->next;
} while (d);
if (Status)
(void) pthread_cancel(Reader);
}
static RETSIGTYPE sigHandler(int signr)
{
switch (signr) {
case SIGHUP:
case SIGINT:
ErrorOccurred = 1;
Terminate = 1;
(void) close(In);
if (TermQ[1] != -1) {
(void) write(TermQ[1],"0",1);
}
if (StartWrite > 0)
(void) pthread_cond_signal(&PercHigh);
if (StartRead < 1)
(void) pthread_cond_signal(&PercLow);
break;
default:
(void) raise(SIGABRT);
}
}
/* Thread-safe replacement for usleep. Argument must be a whole
* number of microseconds to sleep.
*/
static int mt_usleep(unsigned long sleep_usecs)
{
struct timespec tv;
tv.tv_sec = sleep_usecs / 1000000;
tv.tv_nsec = (sleep_usecs % 1000000) * 1000;
do {
/* Sleep for the time specified in tv. If interrupted by a
* signal, place the remaining time left to sleep back into tv.
*/
if (0 == nanosleep(&tv, &tv))
return 0;
} while (errno == EINTR);
return -1;
}
static void *watchdogThread(void *ignored)
{
unsigned long ni = Numin, no = Numout;
for (;;) {
sleep(Timeout);
if ((ni == Numin) && (Finish == -1)) {
errormsg("watchdog timeout: input stalled; sending SIGINT\n");
kill(getpid(),SIGINT);
}
if (no == Numout) {
errormsg("watchdog timeout: output stalled; sending SIGINT\n");
kill(getpid(),SIGINT);
}
ni = Numin;
no = Numout;
}
#ifdef __GNUC__
return 0; // suppresses a gcc warning
#endif
}
static void statusThread(void)
{
struct timeval last, now;
double in = 0, out = 0, total, diff, fill;
unsigned long long lin = 0, lout = 0;
int unwritten = 1; /* assumption: initially there is at least one unwritten block */
fd_set readfds;
struct timeval timeout = {0,200000};
int maxfd = 0;
last = Starttime;
#ifdef __alpha
(void) mt_usleep(1000); /* needed on alpha (stderr fails with fpe on nan) */
#endif
if (TermQ[0] != -1)
maxfd = TermQ[0]+1;
while ((Numin == 0) && (Terminate == 0) && (Finish == -1)) {
timeout.tv_sec = 0;
timeout.tv_usec = 200000;
FD_ZERO(&readfds);
if (TermQ[0] != -1)
FD_SET(TermQ[0],&readfds);
switch (select(maxfd,&readfds,0,0,&timeout)) {
case 0: continue;
case 1: break;
case -1:
if (errno == EINTR)
break;
default: abort();
}
}
while (!Done) {
int err,numsender;
ssize_t nw = 0;
char buf[256], *b = buf;
timeout.tv_sec = 0;
timeout.tv_usec = 500000;
FD_ZERO(&readfds);
if (TermQ[0] != -1)
FD_SET(TermQ[0],&readfds);
err = select(maxfd,&readfds,0,0,&timeout);
switch (err) {
case 0: break;
case 1: return;
case -1:
if (errno == EINTR)
break;
default: abort();
}
(void) gettimeofday(&now,0);
diff = now.tv_sec - last.tv_sec + (double) (now.tv_usec - last.tv_usec) / 1000000;
err = pthread_mutex_lock(&TermMut);
assert(0 == err);
err = sem_getvalue(&Buf2Dev,&unwritten);
assert(0 == err);
fill = (double)unwritten / (double)Numblocks * 100.0;
in = (double)(((Numin - lin) * Blocksize) >> 10);
in /= diff;
out = (double)(((Numout - lout) * Blocksize) >> 10);
out /= diff;
lin = Numin;
lout = Numout;
last = now;
total = (double)((Numout * Blocksize) >> 10);
fill = (fill < 0.0) ? 0.0 : fill;
b += sprintf(b,"\rin @ ");
b += kb2str(b,in);
numsender = NumSenders + MainOutOK - Hashers;
b += sprintf(b,"B/s, out @ ");
b += kb2str(b, out * numsender);
if (numsender != 1)
b += sprintf(b,"B/s, %d x ",numsender);
else
b += sprintf(b,"B/s, ");
b += kb2str(b,total);
b += sprintf(b,"B total, buffer %3.0f%% full",fill);
if (Quiet == 0) {
#ifdef NEED_IO_INTERLOCK
if (Log == STDERR_FILENO) {
int e;
e = pthread_mutex_lock(&LogMut);
assert(e == 0);
nw = write(STDERR_FILENO,buf,strlen(buf));
e = pthread_mutex_unlock(&LogMut);
assert(e == 0);
} else
#endif
nw = write(STDERR_FILENO,buf,strlen(buf));
}
if ((StatusLog != 0) && (Log != STDERR_FILENO))
infomsg("%s\n",buf+1);
err = pthread_mutex_unlock(&TermMut);
assert(0 == err);
if (nw == -1) /* stop trying to print status messages after a write error */
break;
}
}
static inline long long timediff(struct timespec *restrict t1, struct timespec *restrict t2)
{
long long tdiff;
tdiff = (t1->tv_sec - t2->tv_sec) * 1000000;
tdiff += (t1->tv_nsec - t2->tv_nsec) / 1000;
if (tdiff < 0)
tdiff = 0;
return tdiff;
}
static long long enforceSpeedLimit(unsigned long long limit, long long num, struct timespec *last)
{
struct timespec now;
long long tdiff;
double dt;
long self = (long) pthread_self();
num += Blocksize;
if (num < 0) {
debugmsg("enforceSpeedLimit(%lld,%lld): thread %ld\n",limit,num,self);
return num;
}
(void) clock_gettime(ClockSrc,&now);
tdiff = timediff(&now,last);
dt = (double)tdiff * 1E-6;
if (((double)num/dt) > (double)limit) {
double req = (double)num/limit - dt;
long long w = (long long) (req * 1E6);
if (w >= TickTime) {
long long slept, ret;
(void) mt_usleep(w);
(void) clock_gettime(ClockSrc,last);
slept = timediff(last,&now);
ret = -(long long)((double)limit * (double)(slept-w) * 1E-6);
debugmsg("thread %ld: slept for %lld usec (planned for %lld), ret = %lld\n",self,slept,w,ret);
return ret;
} else {
debugmsg("thread %ld: request for sleeping %lld usec delayed\n",self,w);
/*
* Sleeping now would cause too much of a slowdown. So
* we defer this sleep until the sleeping time is
* longer than the tick time. Like this we can stay as
* close to the speed limit as possible.
*/
return num;
}
}
debugmsg("thread %ld: %lld/%g (%g) <= %g\n",self,num,dt,num/dt,(double)limit);
return num;
}
static int promptInteractive(unsigned at, unsigned num)
{
static const char prompt[] = "\nContinue with next volume? Press 'y' to continue or 'n' to finish...";
static const char contmsg[] = "\nyes - continuing with next volume...\n";
static const char donemsg[] = "\nno - input done, waiting for output to finish...\n";
int err;
err = pthread_mutex_lock(&TermMut);
assert(0 == err);
if (-1 == write(STDERR_FILENO,prompt,sizeof(prompt))) {
errormsg("error accessing controlling terminal for manual volume change request: %s\nConsider using autoload option, when running mbuffer without terminal.\n",strerror(errno));
Terminate = 1;
pthread_exit((void *) -1);
}
for (;;) {
char c = 0;
if (-1 == read(STDERR_FILENO,&c,1) && (errno != EINTR)) {
errormsg("error accessing controlling terminal for manual volume change request: %s\nConsider using autoload option, when running mbuffer without terminal.\n",strerror(errno));
Terminate = 1;
pthread_exit((void *) -1);
}
debugmsg("prompt input %c\n",c);
switch (c) {
case 'n':
case 'N':
Rest = num;
(void) write(STDERR_FILENO,donemsg,sizeof(donemsg));
err = pthread_mutex_lock(&HighMut);
assert(err == 0);
err = sem_post(&Buf2Dev);
assert(err == 0);
err = pthread_cond_signal(&PercHigh);
assert(err == 0);
err = pthread_mutex_unlock(&HighMut);
assert(err == 0);
err = pthread_mutex_unlock(&TermMut);
assert(0 == err);
Finish = at;
if (Status)
pthread_exit(0);
return 0;
case 'y':
case 'Y':
(void) write(STDERR_FILENO,contmsg,sizeof(contmsg));
err = pthread_mutex_unlock(&TermMut);
assert(0 == err);
return 1;
default:;
}
}
}
static int requestInputVolume(unsigned at, unsigned num)
{
static struct timeval volstart = {0,0};
const char *cmd;
struct timeval now;
double diff;
unsigned min,hr;
char cmd_buf[15+strlen(Infile)];
debugmsg("requesting new volume for input\n");
(void) gettimeofday(&now,0);
if (volstart.tv_sec)
diff = now.tv_sec - volstart.tv_sec + (double) (now.tv_usec - volstart.tv_usec) * 1E-6;
else
diff = now.tv_sec - Starttime.tv_sec + (double) (now.tv_usec - Starttime.tv_usec) * 1E-6;
if (diff > 3600) {
hr = (unsigned) (diff / 3600);
diff -= hr * 3600;
min = (unsigned) (diff / 60);
diff -= min * 60;
infomsg("time for reading volume: %u:%02u:%02f\n",hr,min,diff);
} else if (diff > 60) {
min = (unsigned) (diff / 60);
diff -= min * 60;
infomsg("time for reading volume: %02u:%02f\n",min,diff);
} else
infomsg("time for reading volume: %02fsec.\n",diff);
if (-1 == close(In))
errormsg("error closing input: %s\n",strerror(errno));
do {
if ((Autoloader) && (Infile)) {
int ret;
if (AutoloadCmd) {
cmd = AutoloadCmd;
} else {
(void) snprintf(cmd_buf, sizeof(cmd_buf), "mt -f %s offline", Infile);
cmd = cmd_buf;
}
infomsg("requesting new input volume with command '%s'\n",cmd);
ret = system(cmd);
if (0 < ret) {
warningmsg("error running \"%s\" to change volume in autoloader: exitcode %d\n",cmd,ret);
Terminate = 1;
pthread_exit((void *) 0);
} else if (0 > ret) {
errormsg("error starting \"%s\" to change volume in autoloader: %s\n", cmd, strerror(errno));
Terminate = 1;
pthread_exit((void *) -1);
}
if (AutoloadTime) {
infomsg("waiting for drive to get ready...\n");
(void) sleep(AutoloadTime);
}
} else {
if (0 == promptInteractive(at,num))
return 0;
}
In = open(Infile, O_RDONLY | LARGEFILE | Direct);
if ((-1 == In) && (errno == EINVAL))
In = open(Infile, O_RDONLY | Direct);
if (-1 == In)
errormsg("could not reopen input: %s\n",strerror(errno));
#ifdef __sun
if (-1 == directio(In,DIRECTIO_ON))
infomsg("direct I/O hinting failed for input: %s\n",strerror(errno));
#endif
} while (In == -1);
(void) gettimeofday(&volstart,0);
diff = volstart.tv_sec - now.tv_sec + (double) (volstart.tv_usec - now.tv_usec) * 1E-6;
infomsg("tape-change took %fsec. - continuing with next volume\n",diff);
NumVolumes--;
if (Terminal && ! Autoloader) {
char msg[] = "\nOK - continuing...\n";
(void) write(STDERR_FILENO,msg,sizeof(msg));
}
return 1;
}
static void releaseLock(void *l)
{
int err = pthread_mutex_unlock((pthread_mutex_t *)l);
assert(err == 0);
}
static void *inputThread(void *ignored)
{
int fill = 0;
unsigned long long num;
int at = 0;
long long xfer = 0;
const double startread = StartRead, startwrite = StartWrite;
struct timespec last;
#ifndef __sun
int maxfd = TermQ[0] > In ? TermQ[0] + 1 : In + 1;
if (Status != 0)
assert(TermQ[0] != -1);
#endif
(void) clock_gettime(ClockSrc,&last);
assert(ignored == 0);
infomsg("inputThread: starting with threadid %ld...\n",(long)pthread_self());
for (;;) {
int err;
if (startread < 1) {
err = pthread_mutex_lock(&LowMut);
assert(err == 0);
err = sem_getvalue(&Buf2Dev,&fill);
assert(err == 0);
if (fill == Numblocks - 1) {
debugmsg("inputThread: buffer full, waiting for it to drain.\n");
pthread_cleanup_push(releaseLock,&LowMut);
err = pthread_cond_wait(&PercLow,&LowMut);
assert(err == 0);
pthread_cleanup_pop(0);
++FullCount;
debugmsg("inputThread: low watermark reached, continuing...\n");
}
err = pthread_mutex_unlock(&LowMut);
assert(err == 0);
}
if (Terminate) { /* for async termination requests */
debugmsg("inputThread: terminating early upon request...\n");
if (-1 == close(In))
errormsg("error closing input: %s\n",strerror(errno));
if (Status)
pthread_exit((void *)1);
return (void *) 1;
}
err = sem_wait(&Dev2Buf); /* Wait for one or more buffer blocks to be free */
assert(err == 0);
num = 0;
do {
int in;
#ifndef __sun
if (Status != 0) {
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(TermQ[0],&readfds);
FD_SET(In,&readfds);
err = select(maxfd,&readfds,0,0,0);
debugiomsg("inputThread: select(%d, {%d,%d}, 0, 0, 0) = %d\n", maxfd,In,TermQ[0],err);
assert((err > 0) || (errno == EBADF));
if (FD_ISSET(TermQ[0],&readfds))
return (void *)-1;
assert(FD_ISSET(In,&readfds));
}
#endif
in = read(In,Buffer[at] + num,Blocksize - num);
debugiomsg("inputThread: read(In, Buffer[%d] + %llu, %llu) = %d\n", at, num, Blocksize - num, in);
if (in > 0) {
num += in;
} else if ((0 == in) && (Terminal||Autoloader) && (NumVolumes != 1)) {
if (0 == requestInputVolume(at,num))
return 0;
} else if ((-1 == in) && (errno == EIO) && (Terminal||Autoloader) && (NumVolumes != 1)) {
requestInputVolume(at,num);
} else if (in <= 0) {
/* error or end-of-file */
if ((-1 == in) && (Terminate == 0))
errormsg("inputThread: error reading at offset 0x%llx: %s\n",Numin*Blocksize,strerror(errno));
Rest = num;
Finish = at;
debugmsg("inputThread: last block has %llu bytes\n",num);
err = pthread_mutex_lock(&HighMut);
assert(err == 0);
err = sem_post(&Buf2Dev);
assert(err == 0);
err = pthread_cond_signal(&PercHigh);
assert(err == 0);
err = pthread_mutex_unlock(&HighMut);
assert(err == 0);
infomsg("inputThread: exiting...\n");
if (Status)
pthread_exit((void *) in);
return (void *) in;
}
} while (num < Blocksize);
if (MaxReadSpeed)
xfer = enforceSpeedLimit(MaxReadSpeed,xfer,&last);
err = sem_post(&Buf2Dev);
assert(err == 0);
if (startwrite > 0) {
err = pthread_mutex_lock(&HighMut);
assert(err == 0);
err = sem_getvalue(&Buf2Dev,&fill);
assert(err == 0);
if (((double) fill / (double) Numblocks) + DBL_EPSILON >= startwrite) {
err = pthread_cond_signal(&PercHigh);
assert(err == 0);
}
err = pthread_mutex_unlock(&HighMut);
assert(err == 0);
}
if (++at == Numblocks)
at = 0;
Numin++;
}
}
static inline int syncSenders(char *b, int s)
{
static volatile int size = 0, skipped = 0;
static char *volatile buf = 0;
int err;
err = pthread_mutex_lock(&SendMut);
assert(err == 0);
if (b) {
buf = b;
size = s;
}
if (s < 0)
--NumSenders;
if (--ActSenders) {
debugiomsg("syncSenders(%p,%d): ActSenders = %d\n",b,s,ActSenders);
pthread_cleanup_push(releaseLock,&SendMut);
err = pthread_cond_wait(&SendCond,&SendMut);
assert(err == 0);
pthread_cleanup_pop(1);
debugiomsg("syncSenders(): continue\n");
return 0;
} else {
ActSenders = NumSenders + 1;
assert((buf != 0) || Terminate);
SendAt = buf;
SendSize = size;
buf = 0;
if (skipped) {
// after the first time, always give a buffer free after sync
err = sem_post(&Dev2Buf);
assert(err == 0);
} else {
// the first time no buffer has been given free
skipped = 1;
}
err = pthread_mutex_unlock(&SendMut);
assert(err == 0);
debugiomsg("syncSenders(): send %d@%p, BROADCAST\n",SendSize,SendAt);
err = pthread_cond_broadcast(&SendCond);
assert(err == 0);
return 1;
}
}
static inline void terminateSender(int fd, dest_t *d, int ret)
{
debugmsg("terminating operation on %s\n",d->arg);
if (-1 != fd) {
int err;
infomsg("syncing %s...\n",d->arg);
do
err = fsync(fd);
while ((err != 0) && (errno == EINTR));
if (err != 0) {
if ((errno == EINVAL) || (errno == EBADRQC)) {
infomsg("syncing unsupported on %s: omitted.\n",d->arg);
} else {
warningmsg("unable to sync %s: %s\n",d->arg,strerror(errno));
}
}
if (-1 == close(fd))
errormsg("error closing file %s: %s\n",d->arg,strerror(errno));
}
if (ret != 0) {
ret = syncSenders(0,-1);
debugmsg("terminateSender(%s): sendSender(0,-1) = %d\n",d->arg,ret);
}
pthread_exit((void *) ret);
}
static void *senderThread(void *arg)
{
unsigned long long outsize = Blocksize;
dest_t *dest = (dest_t *)arg;
int out = dest->fd;
#ifdef HAVE_SENDFILE
int sendout = 1;
#endif
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
struct stat st;
debugmsg("sender(%s): checking output device...\n",dest->arg);
if (-1 == fstat(out,&st))
warningmsg("could not stat output %s: %s\n",dest->arg,strerror(errno));
else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) {
infomsg("blocksize is %d bytes on output device\n",st.st_blksize);
if ((Blocksize < st.st_blksize) || (Blocksize % st.st_blksize != 0)) {
warningmsg("Blocksize should be a multiple of the blocksize of the output device!\n"
"This can cause problems with some device/OS combinations...\n"
"Blocksize on output device %s is %d (transfer block size is %lld)\n", dest->arg, st.st_blksize, Blocksize);
if (SetOutsize) {
errormsg("unable to set output blocksize\n");
dest->result = strerror(errno);
terminateSender(out,dest,1);
}
} else {
if (SetOutsize) {
infomsg("setting output blocksize to %d\n",st.st_blksize);
outsize = st.st_blksize;
}
}
} else
infomsg("no device on output stream %s\n",dest->arg);
#endif
debugmsg("sender(%s): starting...\n",dest->arg);
for (;;) {
int size, num = 0;
(void) syncSenders(0,0);
size = SendSize;
if (0 == size) {
debugmsg("senderThread(\"%s\"): done.\n",dest->arg);
terminateSender(out,dest,0);
return 0; /* for lint */
}
if (Terminate) {
infomsg("senderThread(\"%s\"): terminating early upon request...\n",dest->arg);
dest->result = "canceled";
terminateSender(out,dest,1);
}
do {
unsigned long long rest = size - num;
int ret;
assert(size >= num);
#ifdef HAVE_SENDFILE
if (sendout) {
off_t baddr = (off_t) (SendAt+num);
unsigned long long n = SetOutsize ? (rest > Outsize ? (rest/Outsize)*Outsize : rest) : rest;
ret = sendfile(out,SFV_FD_SELF,&baddr,n);
debugiomsg("sender(%s): sendfile(%d, SFV_FD_SELF, &%p, %llu) = %d\n", dest->arg, dest->fd, (void*)baddr, n, ret);
if ((ret == -1) && ((errno == EINVAL) || (errno == EOPNOTSUPP))) {
sendout = 0;
debugmsg("sender(%s): sendfile unsupported - falling back to write\n", dest->arg);
continue;
}
} else
#endif
{
char *baddr = SendAt+num;
ret = write(out,baddr,rest > outsize ? outsize :rest);
debugiomsg("sender(%s): writing %llu@0x%p: ret = %d\n",dest->arg,rest,(void*)baddr,ret);
}
if (-1 == ret) {
errormsg("error writing to %s: %s\n",dest->arg,strerror(errno));
dest->result = strerror(errno);
terminateSender(out,dest,1);
}
num += ret;
} while (num != size);
}
}
static void *hashThread(void *arg)
{
#ifdef HAVE_MD5
dest_t *dest = (dest_t *) arg;
#ifdef HAVE_LIBMHASH
int algo = dest->fd;
MHASH ctxt = mhash_init(algo);
assert(ctxt != MHASH_FAILED);
#else
MD5_INIT(MD5ctxt);
#endif
debugmsg("hashThread(): starting...\n");
for (;;) {
int size;
(void) syncSenders(0,0);
size = SendSize;
if (0 == size) {
size_t ds;
unsigned char hashvalue[128];
char *msg, *m;
const char *an;
int i;
msg = malloc(300);
m = msg;
debugmsg("hashThread(): done.\n");
#ifdef HAVE_LIBMHASH
mhash_deinit(ctxt,hashvalue);
an = (const char *) mhash_get_hash_name_static(algo);
ds = mhash_get_block_size(algo);
#else
MD5_END(hashvalue,MD5ctxt);
an = "md5";
ds = 16;
#endif
assert(sizeof(hashvalue) >= ds);
m += sprintf(m,"%s hash: ",an);
for (i = 0; i < ds; ++i)
m += sprintf(m,"%02x",(unsigned int)hashvalue[i]);
*m++ = '\n';
*m = 0;
dest->result = msg;
pthread_exit((void *) msg);
return 0; /* for lint */
}
if (Terminate) {
(void) syncSenders(0,-1);