[cups.bugs] [HIGH] STR #3979: Canon SELPHY CP600 Support

[Francesco Rolando]

DO NOT REPLY TO THIS MESSAGE.  INSTEAD, POST ANY RESPONSES TO THE LINK BELOW.

[STR New]

I have modify usb-libusb.c to diag more:

---------------------------------------------------------------------
    if (print_fd != 0)
    {
      fputs("PAGE: 1 1\n", stderr);
      lseek(print_fd, 0, SEEK_SET);
    }

   /*
    * TODO: Add back-channel support, along with better write error
handling.
    */

    fputs("lseek OK\n", stderr);

    while (poll(pfds, 2, -1) > 0)
    {
     /*
      * CUPS STR #3318: USB process hangs on end-of-file, making further
      *                 printing impossible
      *
      * From a strict interpretation of POSIX poll(), POLLHUP should never
be
      * set without POLLIN, since POLLIN is the event you request.  That
said,
      * it appears that some versions of Linux break this.
      */

      if (pfds[0].revents & (POLLIN | POLLHUP))
      {
        if ((bytes = read(print_fd, buffer, sizeof(buffer))) > 0)
        {
          fputs("read OK\n", stderr);
          if (usb_bulk_write(printer->handle, printer->write_endp, buffer,
                                bytes, 3600000) < 0)
          {
            fputs("usb_bulk_write Not OK\n", stderr);
            _cupsLangPrintf(stderr,
                            _("ERROR: Unable to write %d bytes to
printer!\n"),
                            (int)bytes);
            tbytes = -1;
            break;
          }
          else {
            fputs("usb_bulk_write OK\n", stderr);

          }
---------------------------------------------------------------------

This is the output:
DEBUG: print_device
DEBUG: usb_find_busses=5
DEBUG: usb_find_devices=6
STATE: +connecting-to-device
STATE: -connecting-to-device
PAGE: 1 1
lseek OK
read OK

I think stop responding on :
usb_bulk_write(printer->handle, printer->write_endp, buffer,bytes,
3600000) < 0)

Do you have any suggest?

Link: http://www.cups.org/str.php?L3979
Version: 1.4.8