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LDM 6.4.2 Release Notes

• Changes from LDM 6.4.1

• Changes from LDM 6.3.0

• Bug Fixes:
  • Downstream LDM:

    Fixed bug in "DownHelp" module that caused a downstream LDM 5 resulting from a HIYA message to terminate normally with an error status when it received the first data-product.

  • pqact(1):

    Fixed bug described in http://www.unidata.ucar.edu/cgi-bin/getfile?file=/content/support/help/MailArchives/ldm/msg04238.html by improving how pqact(1) manages its file descriptors. File descriptors are now reserved for stdin, stdout, stderr, the configuration-file, the product-queue, and (possibly) logging. Stdin and stdout are redirected to /dev/null at startup to prevent problems with miscoded child programs. Stderr is redirected to /dev/null if logging isn't to stderr. Most other file descriptors are set to close-on-exec.

  • scour(1):

    Fixed a bug in scour(1) that caused it to output extraneous error-messages about not being able to read (irrelevant) directories by simplifying the use of the find(1) command.

  • feedme(1):

    Fixed program feedme(1) -- which didn't work -- by adding use of module xdr_data.

• Non-Bug-Fix Improvements:
  • General:

    Modified module xdr_data. Changed implementation and API to allow programs like feedme(1) to allocate less memory.

    Removed some lint(1).

  • rpc.ldmd(1):

    Added calls to prctl() on Linux systems to allow the LDM program (rpc.ldmd) to dump a core-file.

    Modified LDM server to use new "xdr_data" API.

  • Downstream LDM:

    Cleaned-up code for determining the acceptable class of products from the product-class of a HIYA message and the ACCEPT entries in the LDM configuration-file.

    Modifield "down6" module of downstream LDM system. Renamed down6_new() to down6_init() and made it callable multiple times. Changed handling of uninitialized module from assert()ion failure to error-code return. Modified clients of down6 module accordingly.

  • pqact(1):

    Improved efficiency of writing to a pipe by increasing the size of the pipe-buffer from _POSIX_PIPE_BUF (512) bytes to PIPE_BUF bytes on systems that define PIPE_BUF.

    Modified message logged when it takes longer than one second to flush a pipe: improved wording and reduced logging-level from ERROR to WARNING.

• rpc.ldmd:
  • Server:

    Added ability to use different port than well-known LDM port, 388:

    • Default LDM port can be set when package is built.
    • LDM port on which server will listen can be set when server is executed.
    • Upstream port to which downstream LDM connects can be set in associated REQUEST entry.
  • Downstream LDM 6:
    • Behavior:
      • Reject every data-product that is older than "max_offset" seconds -- regardless of arrival mode (HEREIS or COMINGSOON/BLKDATA).
      • Added ability to encode MD5 signature of last, successfully-received data-product in FEEDME product-class specification when connecting to upstream LDM-6. Should prevent skipping of data-products that arrive at upstream LDM-6 out of temporal order.
      • Added the ability of downstream LDM to automatically adjust transfer-mode of feed (primary vs. secondary) based on success of inserting data-products into product-queue.
      • Replaced adjustment of product-class specification in FEEDME request based on last successfully-received data-product with similar adjustment based on most recent data-product in queue that matches specification. Allows input from other downstream LDM-s.
      • Changed way data-products are accumulated when received via COMINSOON and BLKDATA messages. They are now fully received before any attempt is made to insert them into product-queue.
    • Performance:
      • Reduced CPU utilization by about 75 percent by creating new RPC library function, svc_getreqsock(3) and using it.
      • Increased size of queue for connection requests in LDM server from 2 to 32. Should ameliorate connection problems that occur due to large number of connection attempts in short time.
  • Upstream LDM 6:

    Added "upstream" filtering. An upstream LDM can now filter data-products based the product-identifier and regular-expression in the LDM configuration-file.

• pqact(1):

  Added ability to "back reference" more than nine subexpressions in string-replacement section of pqact(1) actions. Now, for example, string "\(12)" in that section references twelfth subexpression of regular-expression.

• scour(1):

  Added blank line to top of scour(1) script to allow user's with non-conforming shell to execute script directly.

• rtstats(1):
  • Default feedtype returned to ANY from ANY-EXP.
  • Pseudo-random amount of time added to reporting interval to prevent convergence of TCP connections.
• Logging:
  • Removed "@" field from "error" module log messages unless logging-level is DEBUG.
  • Log messages are now prefixed with priority-level (e.g., NOTE, INFO).
  • Slightly modified some log messages.
• Portability:
  • Replaced use of non-standard C macro EPFNOSUPPORT in rpc(3) subpackage with EAFNOSUPPORT and EPROTONOSUPPORT. Necessary to support building under Tiger version of MAC OS X.
  • Replaced use of non-standard "h_addr" member of "hostent" structure with use of "h_addr_list[0]" to increase portability.
  • Added "-lxnet" to LIBS on HP-UX 11 systems when in 64-bit mode.

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