New subject: [Bug 56643] Ntdll support for custom baud rates

5 May 2024

      https://bugs.winehq.org/show_bug.cgi?id=56643

            Bug ID: 56643
           Summary: Ntdll support for custom baud rates
           Product: Wine
           Version: unspecified
          Hardware: Other
                OS: other
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: ntdll
          Assignee: wine-bugs(a)winehq.org
          Reporter: testator(a)protonmail.ch

Implementing custom baud rates across different OS's would be non-trivial but a
useful prerequisite for some obscure apps like qemu or the "mode" command.

Termios2 is a linux specific implementation of custom baud rates. In wine-9.8
there was a commit, 898ab8dab19d498c17859f39a55e317ee7e367a5 , that added
termios2 usage via glibc headers which breaks compilation on musl based
systems, doesn't work in osx, and doesn't work in *bsd.

In
https://opensource.apple.com/source/IOSerialFamily/IOSerialFamily-55/IOSeria...
there is a way to set custom baud rates for osx via IOSSIOSPEED e.g
<IOKit/serial/ioss.h> . Setting the rate on linux via <linux/termios.h> instead
of the glibc specific extensions of <termios.h> would work as well with how its
currently implemented in wine-9.8. It looks like net/openbsd use termios1
modified to their own thing to allow setting arbitrary speeds via tcsetattr
https://github.com/openbsd/src/blob/master/lib/libc/termios/tcsetattr.c e.g
<termios.h> . In general there doesn't seem to be a common unix implementation
for setting custom baud rates and looks like a huge complicated mess to
implement. The musl devs found this out already it seems
openwall.com/lists/musl/2024/04/11/8 .

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[Bug 56643] New: Ntdll support for custom baud rates

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