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PTAL-PHOTOD(8)              TTF2PT1 Font Converter              PTAL-PHOTOD(8)



NAME
       hpoj reference: "ptal-photod"

SYNOPSIS
       ptal-photod devname [options...]

DESCRIPTION
       The "ptal-photod" daemon implements the "mtools" ""floppyd"" network
       protocol.  Its purpose is to let you use "mtools" as a portable method
       for reading and writing files on photo cards inserted in hpoj-supported
       multi-function peripherals.  Such photo cards are normally formatted
       with an MS-DOS FAT or VFAT file system.

OPTIONS
       o   "devname" is the PTAL device name (required)

       Recommended options: one (but usually not both) of the following:

       o   "-maxaltports n" -- tries up to n (for example, 26) successive
           TCP/IP ports if the desired or default TCP/IP port address is
           already in use, presumably by another "ptal-photod" or "floppyd"
           instance

       o   "-portoffset n" -- the desired TCP/IP port offset (default=0) rela-
           tive to the TCP/IP base port (see "-baseport" below)

EXAMPLES
       Given the following lines in "/etc/mtools.conf" (for all users) or
       "~/.mtoolsrc" (for specific users):

       drive p: file=":0" remote drive q: file=":1" remote drive r: file=":2"
       remote

       The "mtools" drive P: will be mapped to port 5703 on the local system,
       drive Q: will be mapped to port 5704, and drive R: will be mapped to
       port 5705.

       o   If you start "ptal-photod" as follows:

           ptal-photod mlc:usb:PSC_900_Series -maxaltports 26 ptal-photod
           mlc:usb:PHOTOSMART_100 -maxaltports 26

           then "mlc:usb:PSC_900_Series" will be bound to port 5703 and there-
           fore drive P:, and "mlc:usb:PHOTOSMART_100" will be bound to port
           5704 and therefore drive Q:, because of the order in which the two
           instances of "ptal-photod" are started.  Drive R: will not have
           anything bound to it.

       o   If you start "ptal-photod" as follows:

           ptal-photod mlc:usb:PSC_900_Series -portoffset 1 ptal-photod
           mlc:usb:PHOTOSMART_100 -portoffset 0 ptal-photod mlc:usb:office-
           jet_d_series -portoffset 1  # Will fail.

           then "mlc:usb:PSC_900_Series" will be bound to port 5704 and there-
           fore drive Q:, and "mlc:usb:PHOTOSMART_100" will be bound to port
           5703 and therefore drive P:, because specific port offsets relative
           to port 5703 were specified.  However, the above invocation for
           "mlc:usb:officejet_d_series" will fail, because the ""-portoffset
           1"" switch conflicts with that of "mlc:usb:PSC_900_Series".  In
           order to safeguard against failures due to inadvertently specifying
           the same "-portoffset" twice, you can still also specify something
           like ""-maxaltports 26"", which would have made "mlc:usb:office-
           jet_d_series" roll over to port 5705 and therefore drive R:.

NOTES
       o   "ptal-photod" logs startup and error messages to syslog
           ("/var/log/messages") in addition to logging to standard error.

       o   "ptal-photod" currently only supports photo cards which were for-
           matted with 512 bytes per sector.

       o   "ptal-photod" is somewhat slow, especially on older models, because
           it currently reads/writes only one sector at a time when presented
           with a multiple-sector request from "mtools".

       o   The "floppyd" protocol was originally designed for accessing local
           floppy drives from a remote system you have logged into and set
           your X-Windows display back to your local system.  As a conse-
           quence, "mtools" expects to find "X cookie" authentication informa-
           tion for each X display number which corresponds to a remote drive,
           even though "ptal-photod" doesn't use this information.  If
           "mtools" gives some sort of "authentication failed" error message
           with a given drive letter (for example, R:) and display number (for
           example, "":2""), then run the command ""xauth add :2 . 00"", sub-
           stituting the correct display number in place of "":2"".

       o   If you use the "-bindto" or "-bindtoall" options to make the
           device's card-reader functionality available to other network
           clients, then be careful to set up an appropriate firewall to pre-
           vent untrusted clients (such as on the public Internet) from
           accessing this service.

       o   If your device provides a standard USB mass-storage interface, you
           may get better performance and usability if you use that access
           method instead of "mtools" and "ptal-photod", because it allows you
           to mount the card as a VFAT file system and use a wide variety of
           Linux/Unix file-management tools.

       o   If you kill and restart "ptal-photod" (presumably via ""ptal-init
           start"") too quickly, then sometimes "ptal-photod" is restarted
           before the old instance's TCP port is fully released, which may
           cause the new instance to use a different TCP port, which will map
           to a different drive letter, or to fail to start altogether.  As a
           workaround, ""ptal-init start"" delays before starting the first
           instance of "ptal-photod", but if this isn't enough and this prob-
           lem still occurs for you, then consider splitting the "restart"
           operation into separate "stop" and "start" steps to give extra time
           for the TCP port to get fully released.



current                         March 13, 2005                  PTAL-PHOTOD(8)