stdout/stderr buffering on Windows

[<freddie.akeroyd@stfc.ac.uk>]

Hi,

just posting a note on an issue we have come across in case it is helpful to anybody else. We are using Cygwin procServ on Windows to start IOCs (Windows 7 / EPICS BASE 3.14.12.2) and, although stdout was appearing when we typed commands in the telnet window, stderr was not. When the IOC exited, however, the stderr output appeared so it seems that stderr was being buffered. I added the line:

    setvbuf (stderr, NULL, _IONBF, BUFSIZ);

to the IOC main and stderr output then appeared as expected - I think stdout was appearing OK as epicsReadline() does a flush(stdout) after writing the prompt. A "google" on the subject returned some references to this sort of behaviour when the Windows runtime does not recognize the connection as a "terminal" - running the IOC directly in a console windows certainly work OK

Regards,

Freddie

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