Red Bear OS
1b3e94a20d
From release 0.1.0 pre-patched archive. This includes all Red Bear modifications previously maintained as patches in local/patches/relibc/.
53 lines
1.5 KiB
Rust
53 lines
1.5 KiB
Rust
use crate::{c_str::CStr, header::stdlib::getenv, platform::types::*};
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use core::ptr;
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use syscall::{EIO, ENOENT, Error, Result, flag::*};
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pub const LIBC_SCHEME: &'static str = "libc:";
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const ENV_MAX_LEN: i32 = i32::MAX;
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macro_rules! env_str {
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($lit:expr) => {
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#[allow(unused_unsafe)]
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{
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let val_bytes = unsafe { getenv(concat!($lit, "\0").as_ptr() as *const c_char) };
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if val_bytes != ptr::null_mut() {
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if let Ok(val_str) = unsafe { CStr::from_ptr(val_bytes) }.to_str() {
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Some(val_str)
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} else {
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None
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}
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} else {
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None
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}
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}
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};
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}
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pub fn open(path: &str, flags: usize) -> Result<usize> {
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assert!(path.starts_with(LIBC_SCHEME));
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if flags & O_SYMLINK != 0 {
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return Err(Error::new(ENOENT));
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}
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let basename = match path.strip_prefix(LIBC_SCHEME) {
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Some(path) => path.trim_matches('/'),
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_ => return Err(Error::new(EIO)),
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};
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// Linux seems to allow you to read from or write to any of /dev/{stdin,stderr,stdout}
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match basename {
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"stderr" => syscall::dup(2, &[]),
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"stdin" => syscall::dup(0, &[]),
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"stdout" => syscall::dup(1, &[]),
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"tty" => {
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if let Some(tty) = env_str!("TTY") {
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return redox_rt::sys::open(tty, flags);
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}
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Err(Error::new(ENOENT))
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}
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_ => Err(Error::new(ENOENT)),
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}
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}
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