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|
//! System bindings for the wasm/web platform
//!
//! This module contains the facade (aka platform-specific) implementations of
//! OS level functionality for wasm. Note that this wasm is *not* the emscripten
//! wasm, so we have no runtime here.
//!
//! This is all super highly experimental and not actually intended for
//! wide/production use yet, it's still all in the experimental category. This
//! will likely change over time.
//!
//! Currently all functions here are basically stubs that immediately return
//! errors. The hope is that with a portability lint we can turn actually just
//! remove all this and just omit parts of the standard library if we're
//! compiling for wasm. That way it's a compile time error for something that's
//! guaranteed to be a runtime error!
use libc;
use crate::io::{Error, ErrorKind};
use crate::mem;
use crate::os::raw::c_char;
pub mod alloc;
pub mod args;
#[cfg(feature = "backtrace")]
pub mod backtrace;
#[path = "../wasm/cmath.rs"]
pub mod cmath;
#[path = "../wasm/condvar.rs"]
pub mod condvar;
pub mod env;
pub mod fd;
pub mod fs;
#[path = "../wasm/memchr.rs"]
pub mod memchr;
#[path = "../wasm/mutex.rs"]
pub mod mutex;
pub mod net;
pub mod io;
pub mod os;
pub use crate::sys_common::os_str_bytes as os_str;
pub mod path;
pub mod pipe;
pub mod process;
#[path = "../wasm/rwlock.rs"]
pub mod rwlock;
#[path = "../wasm/stack_overflow.rs"]
pub mod stack_overflow;
pub mod stdio;
pub mod thread;
#[path = "../wasm/thread_local.rs"]
pub mod thread_local;
pub mod time;
pub mod ext;
#[cfg(not(test))]
pub fn init() {
}
pub fn unsupported<T>() -> crate::io::Result<T> {
Err(unsupported_err())
}
pub fn unsupported_err() -> Error {
Error::new(ErrorKind::Other, "operation not supported on wasm yet")
}
pub fn decode_error_kind(_code: i32) -> ErrorKind {
ErrorKind::Other
}
// This enum is used as the storage for a bunch of types which can't actually
// exist.
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
pub enum Void {}
pub unsafe fn strlen(mut s: *const c_char) -> usize {
let mut n = 0;
while *s != 0 {
n += 1;
s = s.offset(1);
}
return n
}
pub unsafe fn abort_internal() -> ! {
libc::abort()
}
pub fn hashmap_random_keys() -> (u64, u64) {
let mut ret = (0u64, 0u64);
unsafe {
let base = &mut ret as *mut (u64, u64) as *mut libc::c_void;
let len = mem::size_of_val(&ret);
cvt_wasi(libc::__wasi_random_get(base, len)).unwrap();
}
return ret
}
#[doc(hidden)]
pub trait IsMinusOne {
fn is_minus_one(&self) -> bool;
}
macro_rules! impl_is_minus_one {
($($t:ident)*) => ($(impl IsMinusOne for $t {
fn is_minus_one(&self) -> bool {
*self == -1
}
})*)
}
impl_is_minus_one! { i8 i16 i32 i64 isize }
pub fn cvt<T: IsMinusOne>(t: T) -> crate::io::Result<T> {
if t.is_minus_one() {
Err(Error::last_os_error())
} else {
Ok(t)
}
}
pub fn cvt_wasi(r: u16) -> crate::io::Result<()> {
if r != libc::__WASI_ESUCCESS {
Err(Error::from_raw_os_error(r as i32))
} else {
Ok(())
}
}
|
