233 lines
6.0 KiB
C++
Executable File
233 lines
6.0 KiB
C++
Executable File
/*
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Copyright (C) 2004-2008 Grame
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "JackFifo.h"
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#include "JackTools.h"
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#include "JackError.h"
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#include "JackPlatformPlug.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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namespace Jack
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{
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void JackFifo::BuildName(const char* client_name, const char* server_name, char* res, int size)
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{
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char ext_client_name[SYNC_MAX_NAME_SIZE + 1];
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JackTools::RewriteName(client_name, ext_client_name);
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sprintf(res, "%s/jack_fifo.%d_%s_%s", jack_client_dir, JackTools::GetUID(), server_name, ext_client_name);
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}
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bool JackFifo::Signal()
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{
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bool res;
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char c = 0;
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if (fFifo < 0) {
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jack_error("JackFifo::Signal name = %s already deallocated!!", fName);
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return false;
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}
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if (fFlush)
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return true;
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if ((res = (write(fFifo, &c, sizeof(c)) != sizeof(c)))) {
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jack_error("JackFifo::Signal name = %s err = %s", fName, strerror(errno));
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}
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return !res;
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}
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bool JackFifo::SignalAll()
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{
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bool res;
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char c = 0;
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if (fFifo < 0) {
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jack_error("JackFifo::SignalAll name = %s already deallocated!!", fName);
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return false;
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}
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if (fFlush)
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return true;
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if ((res = (write(fFifo, &c, sizeof(c)) != sizeof(c)))) {
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jack_error("JackFifo::SignalAll name = %s err = %s", fName, strerror(errno));
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}
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return !res;
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}
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bool JackFifo::Wait()
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{
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bool res;
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char c;
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if (fFifo < 0) {
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jack_error("JackFifo::Wait name = %s already deallocated!!", fName);
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return false;
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}
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if ((res = (read(fFifo, &c, sizeof(c)) != sizeof(c)))) {
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jack_error("JackFifo::Wait name = %s err = %s", fName, strerror(errno));
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}
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return !res;
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}
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#ifdef __APPLE__
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#warning JackFifo::TimedWait not available : synchronous mode may not work correctly if FIFO are used
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bool JackFifo::TimedWait(long usec)
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{
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return Wait();
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}
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#else
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// Does not work on OSX ??
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bool JackFifo::TimedWait(long usec)
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{
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int res;
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if (fFifo < 0) {
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jack_error("JackFifo::TimedWait name = %s already deallocated!!", fName);
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return false;
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}
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do {
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res = poll(&fPoll, 1, usec / 1000);
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} while (res < 0 && errno == EINTR);
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if (fPoll.revents & POLLIN) {
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return Wait();
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} else {
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// Wait failure but we still continue...
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jack_log("JackFifo::TimedWait name = %s usec = %ld err = %s", fName, usec, strerror(errno));
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return true;
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}
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}
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#endif
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// Server side
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bool JackFifo::Allocate(const char* name, const char* server_name, int value)
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{
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struct stat statbuf;
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BuildName(name, server_name, fName, sizeof(fName));
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jack_log("JackFifo::Allocate name = %s", fName);
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if (stat(fName, &statbuf) < 0) {
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if (errno == ENOENT || errno == EPERM) {
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if (mkfifo(fName, 0666) < 0) {
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jack_error("Cannot create inter-client FIFO name = %s err = %s", fName, strerror(errno));
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return false;
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}
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} else {
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jack_error("Cannot check on FIFO %s", name);
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return false;
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}
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} else {
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if (!S_ISFIFO(statbuf.st_mode)) {
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jack_error("FIFO name = %s already exists, but is not a FIFO", name);
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return false;
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}
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}
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if ((fFifo = open(fName, O_RDWR | O_CREAT, 0666)) < 0) {
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jack_error("Cannot open FIFO name = %s err = %s", name, strerror(errno));
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return false;
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}
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fPoll.fd = fFifo;
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fPoll.events = POLLERR | POLLIN | POLLHUP | POLLNVAL;
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while (value--) {
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Signal();
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}
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return true;
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}
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// Client side
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bool JackFifo::ConnectAux(const char* name, const char* server_name, int access)
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{
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BuildName(name, server_name, fName, sizeof(fName));
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jack_log("JackFifo::ConnectAux name = %s", fName);
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// Temporary...
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if (fFifo >= 0) {
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jack_log("Already connected name = %s", name);
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return true;
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}
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if ((fFifo = open(fName, access)) < 0) {
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jack_error("Connect: can't connect named fifo name = %s err = %s", fName, strerror(errno));
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return false;
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} else {
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fPoll.fd = fFifo;
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fPoll.events = POLLERR | POLLIN | POLLHUP | POLLNVAL;
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return true;
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}
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}
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bool JackFifo::Connect(const char* name, const char* server_name)
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{
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return ConnectAux(name, server_name, O_RDWR);
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}
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bool JackFifo::ConnectOutput(const char* name, const char* server_name)
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{
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return ConnectAux(name, server_name, O_WRONLY | O_NONBLOCK);
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}
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bool JackFifo::ConnectInput(const char* name, const char* server_name)
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{
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return ConnectAux(name, server_name, O_RDONLY);
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}
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bool JackFifo::Disconnect()
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{
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if (fFifo >= 0) {
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jack_log("JackFifo::Disconnect %s", fName);
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if (close(fFifo) != 0) {
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jack_error("Disconnect: can't disconnect named fifo name = %s err = %s", fName, strerror(errno));
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return false;
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} else {
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fFifo = -1;
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return true;
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}
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} else {
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return true;
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}
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}
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// Server side : destroy the fifo
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void JackFifo::Destroy()
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{
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if (fFifo > 0) {
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jack_log("JackFifo::Destroy name = %s", fName);
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unlink(fName);
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if (close(fFifo) != 0) {
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jack_error("Destroy: can't destroy fifo name = %s err = %s", fName, strerror(errno));
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}
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fFifo = -1;
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} else {
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jack_error("JackFifo::Destroy fifo < 0");
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}
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}
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} // end of namespace
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