• src/sbbs3/sbbsexec.c

    From Rob Swindell@VERT to Git commit to main/sbbs/master on Mon Nov 29 18:07:22 2021
    https://gitlab.synchro.net/main/sbbs/-/commit/0d4953ecadccced9caab24b4
    Modified Files:
    src/sbbs3/sbbsexec.c
    Log Message:
    Fix sem_wait() call in vdd_read()

    Introduced in Revision 1.16 (CVS)
    Wed May 10 08:52:11 2006 UTC (15 years, 6 months ago) by rswindell

    This was supposed to wait (block) until there was a new received
    byte (the ringbuf semaphore was signaled), but we were passing the sem_t
    value rather than the pointer to the sem_t. Since sem_t (on Windows)
    is a HANDLE (which is a void*), there was no compiler warning or
    error. Type-safety in C sucks.
    So, this just never worked (I'm assuming the call would just fail).

    I discovered this bug while working on NTVDMx64 support and in that
    case, this call would block/wait forever. Simple one character fix.

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  • From Rob Swindell@VERT to Git commit to main/sbbs/master on Tue Nov 30 19:25:35 2021
    https://gitlab.synchro.net/main/sbbs/-/commit/48874e1e329fbdf00a35d8fb
    Modified Files:
    src/sbbs3/sbbsexec.c
    Log Message:
    The sem_wait() call was just a bad idea after-all

    The sem_wait() call from vdd_read() that was fixed in the previous commit to this file was a bad idea to begin with:
    There is (often) not a 1:1 ratio of bytes in the receive ring buffer and the semaphore count, so we'd often halt here waiting for the semaphore to be signaled even though there were still characters in the receive buffer. This caused (new) stalls/hangs in keyboard input in DOS door games. We didn't see this previously because the sem_wait() call just didn't work (wrong semaphore pointer value).

    Now, call sem_trywait_block() in vdd_read(), but only if the RingBufRead() returned 0 (no bytes read) and even then, only block/wait for a maximum of 30 seconds (same as X00 FOSSIL driver). This blocking behavior is specified for FOSSIL function 02h (Get received character with wait) and would not have worked previous to the previous "fix", so now we have that corrected behavior too. The FTSC spec says the wait is indefinite, but I think a 30 second timeout (ala X00) is more reasonable.

    Log the git brach/hash instead of the old CVS revision.

    GetMailSlotInfo() apparently always fails on Windows 7 with error 87 (even using Microsoft's own sample code), so lower the log message severity of that failure from ERR to DEBUG. Apparently this is pretty harmless anyway as nothing really needs the write-mailslot status. <shrug>

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  • From Rob Swindell@VERT to Git commit to main/sbbs/master on Tue Feb 1 01:26:56 2022
    https://gitlab.synchro.net/main/sbbs/-/commit/5f2881f28b5ed36f112e31cc
    Modified Files:
    src/sbbs3/sbbsexec.c
    Log Message:
    Fix (loss of) carrier detect reporting in Virtual UART driver

    So Hobo and I have noticed that Global War was leaving game lock (*.LOK) files behind when he disconnected while in the game (e.g. due to the game not responding or something).
    This was happening because GWAR was not recognizing the loss of connection ("carrier detect" or DCD) and SBBS would ungracefully terminate the process after 5 seconds of being disconnected, thus the game lock files would remain and requiring manual clean-up.

    I discovered that if I changed the WAR.CFG file to use FOSSIL instead of UART, Global War would then correctly recognize the loss of carrier and exit gracefully (and not leave any .LOK files behind). So... I suspected an issue with the Virtual UART driver. It turns out, that a program that relies on the modem status register change interrupt (and doesn't "poll" the UART MSR register) might never know that the "carrier" was lost. This is fixed by waiting on the hungup_event in the interrupt_thread and deasserting DCD in the "virtual" MSR register and asserting the MSR change interrupt to notify the program that it has in fact changed. Good thing for WaitForMultipleObjects(). Uh huh.

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  • From Rob Swindell@VERT to Git commit to main/sbbs/master on Mon May 9 18:49:26 2022
    https://gitlab.synchro.net/main/sbbs/-/commit/d395a548874bac3a46370a3d
    Modified Files:
    src/sbbs3/sbbsexec.c
    Log Message:
    Better RTS support

    Reducing log output (lowering log level of line 437 from LOG_INFO to LOG_DEBUG) highlighted an issue with Telix stopping RX. That was fixed by checking RTS in input_thread(). Qmodem needs RTS checked when writing the MCR.

    This improved RTS support has been tested with Telix, Qmodem, Telemate, and Banacom at full data rates.

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  • From Rob Swindell@VERT to Git commit to main/sbbs/master on Mon May 23 18:04:14 2022
    https://gitlab.synchro.net/main/sbbs/-/commit/8dbbe0a38f295e6e773f745b
    Modified Files:
    src/sbbs3/sbbsexec.c
    Log Message:
    No need to call reset_yield() if we're not calilng maybe_yield()

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  • From Rob Swindell@VERT to Git commit to main/sbbs/master on Mon May 30 16:35:58 2022
    https://gitlab.synchro.net/main/sbbs/-/commit/3ba5aa8d7a6633e248d57063
    Modified Files:
    src/sbbs3/sbbsexec.c
    Log Message:
    Store the UART register/settings in a struct for easy re-init

    Re-init the UART struct in the init routine to avoid confusion when making .ini file changes with older NTVDMs (including NTVDMx64) which don't re-load the VDDs for every invocation.

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  • From Rob Swindell@VERT to Git commit to main/sbbs/master on Mon May 30 17:23:54 2022
    https://gitlab.synchro.net/main/sbbs/-/commit/19396b9c77e3da8e849eaf7a
    Modified Files:
    src/sbbs3/sbbsexec.c
    Log Message:
    Fix compile-breaking typos in last commit

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  • From Rob Swindell@VERT to Git commit to main/sbbs/master on Sat Jun 4 16:04:34 2022
    https://gitlab.synchro.net/main/sbbs/-/commit/30553f8a946b789856bb49c2
    Modified Files:
    src/sbbs3/sbbsexec.c
    Log Message:
    Better log messages and yielding upon ReadFile(mailslot) error.

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  • From Deuc┬┐@VERT to Git commit to main/sbbs/master on Thu Dec 29 09:55:46 2022
    https://gitlab.synchro.net/main/sbbs/-/commit/9488bda6b6a96006b41db017
    Modified Files:
    src/sbbs3/sbbsexec.c
    Log Message:
    Fix typo

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