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https://github.com/denoland/deno.git
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90 lines
3.3 KiB
Rust
90 lines
3.3 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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/// Ensures that stdin, stdout, and stderr are open and have valid HANDLEs
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/// associated with them. There are many places where a `std::fs::File` is
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/// constructed from a stdio handle; if the handle is null this causes a panic.
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pub fn ensure_stdio_open() {
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#[cfg(windows)]
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// SAFETY: winapi calls
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unsafe {
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use std::mem::size_of;
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use winapi::shared::minwindef::DWORD;
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use winapi::shared::minwindef::FALSE;
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use winapi::shared::minwindef::TRUE;
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use winapi::shared::ntdef::NULL;
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use winapi::shared::winerror::ERROR_INVALID_HANDLE;
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use winapi::um::errhandlingapi::GetLastError;
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use winapi::um::fileapi::CreateFileA;
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use winapi::um::fileapi::OPEN_EXISTING;
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use winapi::um::handleapi::GetHandleInformation;
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use winapi::um::handleapi::INVALID_HANDLE_VALUE;
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use winapi::um::minwinbase::SECURITY_ATTRIBUTES;
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use winapi::um::processenv::GetStdHandle;
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use winapi::um::processenv::SetStdHandle;
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use winapi::um::winbase::STD_ERROR_HANDLE;
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use winapi::um::winbase::STD_INPUT_HANDLE;
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use winapi::um::winbase::STD_OUTPUT_HANDLE;
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use winapi::um::winnt::FILE_ATTRIBUTE_NORMAL;
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use winapi::um::winnt::FILE_GENERIC_READ;
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use winapi::um::winnt::FILE_GENERIC_WRITE;
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use winapi::um::winnt::FILE_READ_ATTRIBUTES;
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use winapi::um::winnt::FILE_SHARE_READ;
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use winapi::um::winnt::FILE_SHARE_WRITE;
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for std_handle in [STD_INPUT_HANDLE, STD_OUTPUT_HANDLE, STD_ERROR_HANDLE] {
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// Check whether stdio handle is open.
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let is_valid = match GetStdHandle(std_handle) {
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NULL | INVALID_HANDLE_VALUE => false,
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handle => {
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// The stdio handle is open; check whether its handle is valid.
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let mut flags: DWORD = 0;
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match GetHandleInformation(handle, &mut flags) {
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TRUE => true,
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FALSE if GetLastError() == ERROR_INVALID_HANDLE => false,
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FALSE => {
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panic!("GetHandleInformation failed (error {})", GetLastError());
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}
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_ => unreachable!(),
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}
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}
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};
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if !is_valid {
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// Open NUL device.
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let desired_access = match std_handle {
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STD_INPUT_HANDLE => FILE_GENERIC_READ,
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_ => FILE_GENERIC_WRITE | FILE_READ_ATTRIBUTES,
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};
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let security_attributes = SECURITY_ATTRIBUTES {
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nLength: size_of::<SECURITY_ATTRIBUTES>() as DWORD,
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lpSecurityDescriptor: NULL,
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bInheritHandle: TRUE,
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};
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let file_handle = CreateFileA(
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b"\\\\?\\NUL\0" as *const _ as *mut _,
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desired_access,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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&security_attributes as *const _ as *mut _,
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OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL,
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NULL,
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);
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match file_handle {
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NULL => unreachable!(),
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INVALID_HANDLE_VALUE => {
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panic!("Could not open NUL device (error {})", GetLastError());
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}
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_ => {}
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}
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// Assign the opened NUL handle to the missing stdio handle.
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let success = SetStdHandle(std_handle, file_handle);
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match success {
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TRUE => {}
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FALSE => panic!("SetStdHandle failed (error {})", GetLastError()),
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_ => unreachable!(),
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}
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}
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}
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}
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}
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