Re: [Tarantool-patches] [PATCH v1.1] evio: workaround for wsl1 so_linger assertion

[Vladislav Shpilevoy <v.shpilevoy@tarantool.org>]

Hi! Thanks for the patch!

Please, keep branch link in each new email thread.

On 16/03/2020 17:53, Timur Safin wrote:
> SO_LINGER makes no much sense for unix-sockets, and Microsoft WSL
> is returning EINVAL if setsockopts called for SO_LINGER over unix
> sockets:
> 
>   [004] 2020-03-11 18:42:29.592 [29182] main/102/app sio.c:169 !> SystemError setsockopt(SO_LINGER), called on fd 16, aka
>   [004] 2020-03-11 18:42:29.592 [29182] main/102/app F> can't initialize storage: setsockopt(SO_LINGER), called on fd 16,
>   [004] 2020-03-11 18:42:29.592 [29182] main/102/app F> can't initialize storage: setsockopt(SO_LINGER), called on fd 16,
> 
> And it's sort of correct here, but the problem is Linux is simply
> silently ignoring it, which passes tests.
> 
> After much debates we decided to work-around this case via CMAKE
> define.
> 
> NB! In a future (April/May 2020), when WSL2 with full Linux kernel
> would be released we should disable this check.
> 
> Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
> ---
>  cmake/os.cmake      | 13 +++++++++++++
>  src/lib/core/evio.c |  2 ++
>  2 files changed, 15 insertions(+)
> 
> diff --git a/cmake/os.cmake b/cmake/os.cmake
> index 0ed554b9b..c6b19f379 100644
> --- a/cmake/os.cmake
> +++ b/cmake/os.cmake
> @@ -11,6 +11,15 @@ if (${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
>  # (see man page for feature_test_macros).
>      add_definitions("-D_FILE_OFFSET_BITS=64")
>      find_package_message(PLATFORM "Building for Linux" "${CMAKE_SYSTEM_NAME}")
> +
> +    # There are some subtle differences in Linux kernel calls
> +    # implementation under WSL1 (which should go away with WSL2 kernel)
> +    # so for a moment we introduce a way to distinguish Linux and
> +    # Microsoft/WSL1
> +    if (${CMAKE_SYSTEM} MATCHES "Linux-.*-Microsoft")
> +        add_definitions("-DTARANTOOL_WSL1_WORKAROUND_ENABLED=1")
> +    endif()

To be more consistent I would better call it TARGET_OS_WSL1.
Since we already have TARGET_OS_LINUX, TARGET_OS_FREEBSD,
TARGET_OS_DEBIAN_FREEBSD, TARGET_OS_NETBSD, TARGET_OS_DARWIN.

Besides, it would be consistent with other similar examples
such as fio_filename(), load_cfg(), make_pipe(), and so on. They
use TARGET_OS_* name.

> +
>  elseif (${CMAKE_SYSTEM_NAME} STREQUAL "kFreeBSD")
>      set(TARGET_OS_FREEBSD 1)
>      set(TARGET_OS_DEBIAN_FREEBSD 1)
> @@ -19,6 +28,7 @@ elseif (${CMAKE_SYSTEM_NAME} STREQUAL "kFreeBSD")
>      add_definitions("-D_FILE_OFFSET_BITS=64")
>      find_package_message(PLATFORM "Building for Debian/kFreeBSD"
>          "${CMAKE_SYSTEM_NAME}")
> +

Please, omit not necessary diff. This and other new empty lines
below.

>  elseif (${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
>      set(TARGET_OS_FREEBSD 1)
>      find_package_message(PLATFORM "Building for FreeBSD" "${CMAKE_SYSTEM_NAME}")
> @@ -57,9 +67,11 @@ elseif (${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
>                          "system libraries is not supported")
>      endif()
>      unset(REAL_OPENSSL_ROOT_DIR)
> +
>  elseif (${CMAKE_SYSTEM_NAME} STREQUAL "NetBSD")
>      set(TARGET_OS_NETBSD 1)
>      find_package_message(PLATFORM "Building for NetBSD" "${CMAKE_SYSTEM_NAME}")
> +
>  elseif (${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
>      set(TARGET_OS_DARWIN 1)
>  
> @@ -154,6 +166,7 @@ elseif (${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
>              endif()
>          endif()
>      endif()
> +
>  else()
>      message (FATAL_ERROR "Unsupported platform -- ${CMAKE_SYSTEM_NAME}")
>  endif()