LDM 6.4.6 Release Notes

• Changes from LDM 6.4.5

• Changes from LDM 6.3

• Improved error-message from readtcp() in the svc_tcp module when a select() on the socket times-out.
• Modified ldmadmin(1) script to allow a zero argument to the offset option (-o).
• Corrected behavior of the "-overwrite" option in pqact(1)'s FILE and STDIOFILE actions. Before, data-products would always be appended unless the file was closed -- either explicitly via the "close" option or implicitly (and unpredictably) if pqact(1) ran out of file descriptors. Now, both those actions always start writing from the beginning of the file.
• Corrected "-P port" option for ldmsend(1). The option affected an LDM 6 connection but not an LDM 5 connection. Now it does.
• Renamed the type "error_t" to "ErrorObj" to avoid a legitimate name-conflict with system headers.
• Modified pq_del_oldest(3)) function so that it releases the data region if the signature isn't found in the signature-list. This should have little, practical effect because the result of not finding the signature entry is, ultimately, to terminate the downstream LDM (once the queue is corrupt, it's a little late to ensure consistency -- still, the code is better).
• Modified vulog(3) function. Because it calls functions that are unsafe in the presence of asynchronous signals (e.g., SIGCHLD), it now blocks most signals during its execution. This should prevent a SIGSEGV from occuring when inside the strftime(3) function when a SIGCHLD is received.
• Changed error-message "Terminating due to LDM failure..." to "Disconnecting due to LDM failure..." to improve accuracy.
• Moved initialization of autoshift module to accomodate incoming HIYA connections that start sending data-products regardless of a RECLASS reply. This solves a problem receiving data from WSI.
• Corrected ulog/log module (it only printed the first message).
• Cosmetic changes to "ulog/log" module.
• Committed previous-version changes to RPC library so that they will actually appear in a distribution.

• 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.