lib/components/file_eraser.cpp

   1 #include <lib/components/file_eraser.h>
   2 #include <lib/base/eerror.h>
   3 #include <lib/base/init.h>
   4 #include <lib/base/init_num.h>
   5 #include <sys/types.h>
   6 #include <sys/wait.h>
   7 #include <unistd.h>
   8 #include <errno.h>
   9
  10 eBackgroundFileEraser *eBackgroundFileEraser::instance;
  11
  12 eBackgroundFileEraser::eBackgroundFileEraser()
  13         :messages(this,1), stop_thread_timer(this)
  14 {
  15         if (!instance)
  16                 instance=this;
  17         CONNECT(messages.recv_msg, eBackgroundFileEraser::gotMessage);
  18         CONNECT(stop_thread_timer.timeout, eBackgroundFileEraser::idle);
  19 }
  20
  21 void eBackgroundFileEraser::idle()
  22 {
  23         quit(0);
  24 }
  25
  26 eBackgroundFileEraser::~eBackgroundFileEraser()
  27 {
  28         messages.send(Message::quit);
  29         if (instance==this)
  30                 instance=0;
  31 }
  32
  33 void eBackgroundFileEraser::thread()
  34 {
  35         hasStarted();
  36         nice(5);
  37         reset();
  38         runLoop();
  39         stop_thread_timer.stop();
  40 }
  41
  42 void eBackgroundFileEraser::erase(const char *filename)
  43 {
  44         if (filename)
  45         {
  46                 char buf[255];
  47                 snprintf(buf, 255, "%s.$$$", filename);
  48                 if (rename(filename, buf)<0)
  49                         ;/*perror("rename file failed !!!");*/
  50                 else
  51                 {
  52                         messages.send(Message(Message::erase, strdup(buf)));
  53                         run();
  54                 }
  55         }
  56 }
  57
  58 void eBackgroundFileEraser::gotMessage(const Message &msg )
  59 {
  60         switch (msg.type)
  61         {
  62                 case Message::erase:
  63                         if ( msg.filename )
  64                         {
  65                                 if ( ::unlink(msg.filename) < 0 )
  66                                         eDebug("remove file %s failed (%m)", msg.filename);
  67                                 else
  68                                         eDebug("file %s erased", msg.filename);
  69                                 free((char*)msg.filename);
  70                         }
  71                         stop_thread_timer.start(2000, true); // stop thread in two seconds
  72                         break;
  73                 case Message::quit:
  74                         quit(0);
  75                         break;
  76                 default:
  77                         eDebug("unhandled thread message");
  78         }
  79 }
  80
  81 eAutoInitP0<eBackgroundFileEraser> init_eBackgroundFilEraser(eAutoInitNumbers::configuration+1, "Background File Eraser");