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//! This is just a sample of what FFI using this crate can look like.
#![cfg_attr(not(io_safety_is_in_std), allow(unused_imports))]
#![allow(missing_docs)]
#[cfg(any(unix, target_os = "wasi", target_os = "hermit"))]
use crate::{BorrowedFd, OwnedFd};
#[cfg(windows)]
use crate::{BorrowedHandle, HandleOrInvalid};
#[cfg(any(unix, target_os = "wasi", target_os = "hermit"))]
use libc::{c_char, c_int, c_void, size_t, ssize_t};
#[cfg(windows)]
use {
core::ffi::c_void,
windows_sys::core::PCWSTR,
windows_sys::Win32::Foundation::BOOL,
windows_sys::Win32::Security::SECURITY_ATTRIBUTES,
windows_sys::Win32::Storage::FileSystem::{
FILE_ACCESS_FLAGS, FILE_CREATION_DISPOSITION, FILE_FLAGS_AND_ATTRIBUTES, FILE_SHARE_MODE,
},
windows_sys::Win32::System::IO::OVERLAPPED,
};
// Declare a few FFI functions ourselves, to show off the FFI ergonomics.
#[cfg(all(
io_safety_is_in_std,
any(unix, target_os = "wasi", target_os = "hermit")
))]
extern "C" {
pub fn open(pathname: *const c_char, flags: c_int, ...) -> Option<OwnedFd>;
}
#[cfg(any(unix, target_os = "wasi"))]
extern "C" {
pub fn read(fd: BorrowedFd<'_>, ptr: *mut c_void, size: size_t) -> ssize_t;
pub fn write(fd: BorrowedFd<'_>, ptr: *const c_void, size: size_t) -> ssize_t;
}
#[cfg(any(unix, target_os = "wasi"))]
pub use libc::{O_CLOEXEC, O_CREAT, O_RDONLY, O_RDWR, O_TRUNC, O_WRONLY};
// The Windows analogs of the above. Note the use of [`HandleOrInvalid`] as
// the return type for `CreateFileW`, since that function is defined to return
// [`INVALID_HANDLE_VALUE`] on error instead of null.
#[cfg(windows)]
extern "system" {
pub fn CreateFileW(
lpfilename: PCWSTR,
dwdesiredaccess: FILE_ACCESS_FLAGS,
dwsharemode: FILE_SHARE_MODE,
lpsecurityattributes: *const SECURITY_ATTRIBUTES,
dwcreationdisposition: FILE_CREATION_DISPOSITION,
dwflagsandattributes: FILE_FLAGS_AND_ATTRIBUTES,
htemplatefile: HANDLE,
) -> HandleOrInvalid;
pub fn ReadFile(
hfile: BorrowedHandle<'_>,
lpbuffer: *mut c_void,
nnumberofbytestoread: u32,
lpnumberofbytesread: *mut u32,
lpoverlapped: *mut OVERLAPPED,
) -> BOOL;
pub fn WriteFile(
hfile: BorrowedHandle<'_>,
lpbuffer: *const c_void,
nnumberofbytestowrite: u32,
lpnumberofbyteswritten: *mut u32,
lpoverlapped: *mut OVERLAPPED,
) -> BOOL;
}
#[cfg(windows)]
pub use {
windows_sys::Win32::Foundation::HANDLE,
windows_sys::Win32::Storage::FileSystem::{
CREATE_ALWAYS, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, FILE_GENERIC_READ, FILE_GENERIC_WRITE,
OPEN_EXISTING,
},
};
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