ZZ>
  > How can I create a file with a unique filename under OS/2?
ZZ>

  Unique as in "I want a temporary file to use" ?

    Use the tmpnam() function supplied in your Standard C Library.

  Unique as in "I don't want to conflict with an existing file" ?

    Use a simple for(;;) loop that constructs successive filenames until
    it creates a name that does not exist.  To avoid race conditions in
    multiprocess and network environments such as OS/2, use
    DosOpen(...OPEN_ACTION_FAIL_IF_EXISTS...) rather than
    DosQueryPathInfo() to determine if a file exists.

  Unique as in "I don't ever want to use the same name twice" ?

    Construct the filename from a combination of the local machine name,
    the current date and time (use the POSIX 1003.1 time in seconds
    since The Epoch), the current process and thread IDs, and a sequence
    number if the date/time isn't granular enough for your purposes
    (i.e. if the same thread is likely to create more than one of these
    files per second on a fast machine).

    i.e. use the  tuple,
    which is guaranteed unique until the clock wraps around.

  > JdeBP <
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