How to use libc in Windows

[akitaSummer]

Hello, I've been working on a user-space file system project, and I've been using libc on Linux and macOS, which has been quite useful. However, I'm not sure if libc is still applicable on Windows. For instance, I have the following code:

write(
    file.as_raw_fd(),
    slice.as_ptr() as *const c_void,
    slice.len(),
)

This code works fine on Linux, but it's not compatible with Windows because Windows doesn't have file descriptors (fd), only handles. I'd like to ask whether it's possible to use libc on Windows, and if so, how should I modify my code?

Thanks

[JohnTitor]

You can check docs.rs, for example x86_64-pc-windows-msvc is here: https://docs.rs/libc/latest/x86_64-pc-windows-msvc/libc/index.html

But I'd recommend checking the windows-rs, which exposes many more APIs: https://github.com/microsoft/windows-rs

[akitaSummer]

@JohnTitor
My friend, I understand your point, and I have also checked the documentation for libc. Taking write as an example, its definition is:

pub unsafe extern "C" fn write(
    fd: c_int,
    buf: *const c_void,
    count: c_uint
) -> c_int

However, the type of file.as_raw_handle() is *mut c_void. Can I directly use handle as c_int for this?

Thanks

[ChrisDenton]

libc uses fds (file descriptors), not handles. If you want to use libc instead of the raw Windows API then you'll either need to open the file using libc or else create a new fd using the raw handle via open_osfhandle.

[akitaSummer]

@ChrisDenton Thank you, your solution has resolved my issue.