JackFifo.cpp
/*
Copyright (C) 2004-2008 Grame
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "JackFifo.h"
#include "JackTools.h"
#include "JackError.h"
#include "JackPlatformPlug.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
namespace Jack
{
void JackFifo::BuildName(const char* client_name, const char* server_name, char* res, int size)
{
char ext_client_name[SYNC_MAX_NAME_SIZE + 1];
JackTools::RewriteName(client_name, ext_client_name);
sprintf(res, "%s/jack_fifo.%d_%s_%s", jack_client_dir, JackTools::GetUID(), server_name, ext_client_name);
}
bool JackFifo::Signal()
{
bool res;
char c = 0;
if (fFifo < 0) {
jack_error("JackFifo::Signal name = %s already desallocated!!", fName);
return false;
}
if (fFlush)
return true;
if ((res = (write(fFifo, &c, sizeof(c)) != sizeof(c)))) {
jack_error("JackFifo::Signal name = %s err = %s", fName, strerror(errno));
}
return !res;
}
bool JackFifo::SignalAll()
{
bool res;
char c = 0;
if (fFifo < 0) {
jack_error("JackFifo::SignalAll name = %s already desallocated!!", fName);
return false;
}
if (fFlush)
return true;
if ((res = (write(fFifo, &c, sizeof(c)) != sizeof(c)))) {
jack_error("JackFifo::SignalAll name = %s err = %s", fName, strerror(errno));
}
return !res;
}
bool JackFifo::Wait()
{
bool res;
char c;
if (fFifo < 0) {
jack_error("JackFifo::Wait name = %s already desallocated!!", fName);
return false;
}
if ((res = (read(fFifo, &c, sizeof(c)) != sizeof(c)))) {
jack_error("JackFifo::Wait name = %s err = %s", fName, strerror(errno));
}
return !res;
}
#ifdef __APPLE__
#warning JackFifo::TimedWait not available : synchronous mode may not work correctly if FIFO are used
bool JackFifo::TimedWait(long usec)
{
return Wait();
}
#else
// Does not work on OSX ??
bool JackFifo::TimedWait(long usec)
{
int res;
if (fFifo < 0) {
jack_error("JackFifo::TimedWait name = %s already desallocated!!", fName);
return false;
}
do {
res = poll(&fPoll, 1, usec / 1000);
} while (res < 0 && errno == EINTR);
if (fPoll.revents & POLLIN) {
return Wait();
} else {
// Wait failure but we still continue...
jack_log("JackFifo::TimedWait name = %s usec = %ld err = %s", fName, usec, strerror(errno));
return true;
}
}
#endif
// Server side
bool JackFifo::Allocate(const char* name, const char* server_name, int value)
{
struct stat statbuf;
BuildName(name, server_name, fName, sizeof(fName));
jack_log("JackFifo::Allocate name = %s", fName);
if (stat(fName, &statbuf) < 0) {
if (errno == ENOENT || errno == EPERM) {
if (mkfifo(fName, 0666) < 0) {
jack_error("Cannot create inter-client FIFO name = %s err = %s", name, strerror(errno));
return false;
}
} else {
jack_error("Cannot check on FIFO %s", name);
return false;
}
} else {
if (!S_ISFIFO(statbuf.st_mode)) {
jack_error("FIFO name = %s already exists, but is not a FIFO", name);
return false;
}
}
if ((fFifo = open(fName, O_RDWR | O_CREAT, 0666)) < 0) {
jack_error("Cannot open FIFO name = %s err = %s", name, strerror(errno));
return false;
} else {
fPoll.fd = fFifo;
fPoll.events = POLLERR | POLLIN | POLLHUP | POLLNVAL;
return true;
}
}
// Client side
bool JackFifo::ConnectAux(const char* name, const char* server_name, int access)
{
BuildName(name, server_name, fName, sizeof(fName));
jack_log("JackFifo::ConnectAux name = %s", fName);
// Temporary...
if (fFifo >= 0) {
jack_log("Already connected name = %s", name);
return true;
}
if ((fFifo = open(fName, access)) < 0) {
jack_error("Connect: can't connect named fifo name = %s err = %s", fName, strerror(errno));
return false;
} else {
fPoll.fd = fFifo;
fPoll.events = POLLERR | POLLIN | POLLHUP | POLLNVAL;
return true;
}
}
bool JackFifo::Connect(const char* name, const char* server_name)
{
return ConnectAux(name, server_name, O_RDWR);
}
bool JackFifo::ConnectOutput(const char* name, const char* server_name)
{
return ConnectAux(name, server_name, O_WRONLY | O_NONBLOCK);
}
bool JackFifo::ConnectInput(const char* name, const char* server_name)
{
return ConnectAux(name, server_name, O_RDONLY);
}
bool JackFifo::Disconnect()
{
if (fFifo >= 0) {
jack_log("JackFifo::Disconnect %s", fName);
if (close(fFifo) != 0) {
jack_error("Disconnect: can't disconnect named fifo name = %s err = %s", fName, strerror(errno));
return false;
} else {
fFifo = -1;
return true;
}
} else {
return true;
}
}
// Server side : destroy the fifo
void JackFifo::Destroy()
{
if (fFifo > 0) {
jack_log("JackFifo::Destroy name = %s", fName);
unlink(fName);
if (close(fFifo) != 0) {
jack_error("Destroy: can't destroy fifo name = %s err = %s", fName, strerror(errno));
}
fFifo = -1;
} else {
jack_error("JackFifo::Destroy fifo < 0");
}
}
} // end of namespace
Jack
Definition: JackAC3Encoder.cpp:30
jack_error
SERVER_EXPORT void jack_error(const char *fmt,...)
Definition: JackError.cpp:92
jack_log
SERVER_EXPORT void jack_log(const char *fmt,...)
Definition: JackError.cpp:108