lib/base/filepush.cpp

   1 #include <lib/base/filepush.h>
   2 #include <lib/base/eerror.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <sys/ioctl.h>
   6
   7 #define PVR_COMMIT 1
   8
   9 eFilePushThread::eFilePushThread(int io_prio_class, int io_prio_level)
  10         :prio_class(io_prio_class), prio(io_prio_level), m_messagepump(eApp, 0)
  11 {
  12         m_stop = 0;
  13         m_sg = 0;
  14         flush();
  15         enablePVRCommit(0);
  16         CONNECT(m_messagepump.recv_msg, eFilePushThread::recvEvent);
  17 }
  18
  19 static void signal_handler(int x)
  20 {
  21 }
  22
  23 void eFilePushThread::thread()
  24 {
  25         setIoPrio(prio_class, prio);
  26
  27         off_t dest_pos = 0, source_pos = 0;
  28         size_t bytes_read = 0;
  29
  30         off_t current_span_offset = 0;
  31         size_t current_span_remaining = 0;
  32
  33         size_t written_since_last_sync = 0;
  34
  35         int already_empty = 0;
  36         eDebug("FILEPUSH THREAD START");
  37
  38                 /* we set the signal to not restart syscalls, so we can detect our signal. */
  39         struct sigaction act;
  40         act.sa_handler = signal_handler; // no, SIG_IGN doesn't do it. we want to receive the -EINTR
  41         act.sa_flags = 0;
  42         sigaction(SIGUSR1, &act, 0);
  43
  44         hasStarted();
  45
  46         source_pos = m_raw_source.lseek(0, SEEK_CUR);
  47
  48                 /* m_stop must be evaluated after each syscall. */
  49         while (!m_stop)
  50         {
  51                         /* first try flushing the bufptr */
  52                 if (m_buf_start != m_buf_end)
  53                 {
  54                                 // TODO: take care of boundaries.
  55                         filterRecordData(m_buffer + m_buf_start, m_buf_end - m_buf_start);
  56                         int w = write(m_fd_dest, m_buffer + m_buf_start, m_buf_end - m_buf_start);
  57 //                      eDebug("wrote %d bytes", w);
  58                         if (w <= 0)
  59                         {
  60                                 if (errno == EINTR)
  61                                         continue;
  62                                 break;
  63                                 // ... we would stop the thread
  64                         }
  65
  66                         written_since_last_sync += w;
  67
  68                         if (written_since_last_sync >= 512*1024)
  69                         {
  70                                 int toflush = written_since_last_sync > 2*1024*1024 ?
  71                                         2*1024*1024 : written_since_last_sync &~ 4095; // write max 2MB at once
  72                                 dest_pos = lseek(m_fd_dest, 0, SEEK_CUR);
  73                                 dest_pos -= toflush;
  74                                 posix_fadvise(m_fd_dest, dest_pos, toflush, POSIX_FADV_DONTNEED);
  75                                 written_since_last_sync -= toflush;
  76                         }
  77
  78 //                      printf("FILEPUSH: wrote %d bytes\n", w);
  79                         m_buf_start += w;
  80                         continue;
  81                 }
  82
  83                         /* now fill our buffer. */
  84
  85                 if (m_sg && !current_span_remaining)
  86                 {
  87                         m_sg->getNextSourceSpan(source_pos, bytes_read, current_span_offset, current_span_remaining);
  88
  89                         if (source_pos != current_span_offset)
  90                                 source_pos = m_raw_source.lseek(current_span_offset, SEEK_SET);
  91                         bytes_read = 0;
  92                 }
  93
  94                 size_t maxread = sizeof(m_buffer);
  95
  96                         /* if we have a source span, don't read past the end */
  97                 if (m_sg && maxread > current_span_remaining)
  98                         maxread = current_span_remaining;
  99
 100                 m_buf_start = 0;
 101                 m_buf_end = 0;
 102
 103                 if (maxread)
 104                         m_buf_end = m_raw_source.read(m_buffer, maxread);
 105
 106                 if (m_buf_end < 0)
 107                 {
 108                         m_buf_end = 0;
 109                         if (errno == EINTR)
 110                                 continue;
 111                         if (errno == EOVERFLOW)
 112                         {
 113                                 eWarning("OVERFLOW while recording");
 114                                 continue;
 115                         }
 116                         eDebug("eFilePushThread *read error* (%m) - not yet handled");
 117                 }
 118                 if (m_buf_end == 0)
 119                 {
 120                                 /* on EOF, try COMMITting once. */
 121                         if (m_send_pvr_commit && !already_empty)
 122                         {
 123                                 eDebug("sending PVR commit");
 124                                 already_empty = 1;
 125                                 if (::ioctl(m_fd_dest, PVR_COMMIT) < 0 && errno == EINTR)
 126                                         continue;
 127                                 eDebug("commit done");
 128                                                 /* well check again */
 129                                 continue;
 130                         }
 131                         sendEvent(evtEOF);
 132 #if 0
 133                         eDebug("FILEPUSH: end-of-file! (currently unhandled)");
 134                         if (!m_raw_source.lseek(0, SEEK_SET))
 135                         {
 136                                 eDebug("(looping)");
 137                                 continue;
 138                         }
 139 #endif
 140                         break;
 141                 } else
 142                 {
 143                         source_pos += m_buf_end;
 144                         bytes_read += m_buf_end;
 145                         if (m_sg)
 146                                 current_span_remaining -= m_buf_end;
 147                         already_empty = 0;
 148                 }
 149 //              printf("FILEPUSH: read %d bytes\n", m_buf_end);
 150         }
 151         fdatasync(m_fd_dest);
 152
 153         eDebug("FILEPUSH THREAD STOP");
 154 }
 155
 156 void eFilePushThread::start(int fd_source, int fd_dest)
 157 {
 158         m_raw_source.setfd(fd_source);
 159         m_fd_dest = fd_dest;
 160         resume();
 161 }
 162
 163 int eFilePushThread::start(const char *filename, int fd_dest)
 164 {
 165         if (m_raw_source.open(filename) < 0)
 166                 return -1;
 167         m_fd_dest = fd_dest;
 168         resume();
 169         return 0;
 170 }
 171
 172 void eFilePushThread::stop()
 173 {
 174                 /* if we aren't running, don't bother stopping. */
 175         if (!sync())
 176                 return;
 177
 178         m_stop = 1;
 179
 180         // fixmee.. here we need a better solution to ensure
 181         // that the thread context take notice of the signal
 182         // even when no syscall is in progress
 183         while(!sendSignal(SIGUSR1))
 184         {
 185                 eDebug("send SIGUSR1 to thread context");
 186                 usleep(5000); // wait msek
 187         }
 188         kill();
 189 }
 190
 191 void eFilePushThread::pause()
 192 {
 193         stop();
 194 }
 195
 196 void eFilePushThread::seek(int whence, off_t where)
 197 {
 198         m_raw_source.lseek(where, whence);
 199 }
 200
 201 void eFilePushThread::resume()
 202 {
 203         m_stop = 0;
 204         run();
 205 }
 206
 207 void eFilePushThread::flush()
 208 {
 209         m_buf_start = m_buf_end = 0;
 210 }
 211
 212 void eFilePushThread::enablePVRCommit(int s)
 213 {
 214         m_send_pvr_commit = s;
 215 }
 216
 217 void eFilePushThread::setScatterGather(iFilePushScatterGather *sg)
 218 {
 219         m_sg = sg;
 220 }
 221
 222 void eFilePushThread::sendEvent(int evt)
 223 {
 224         m_messagepump.send(evt);
 225 }
 226
 227 void eFilePushThread::recvEvent(const int &evt)
 228 {
 229         m_event(evt);
 230 }
 231
 232 void eFilePushThread::filterRecordData(const unsigned char *data, int len)
 233 {
 234         /* do nothing */
 235 }
 236