library/std/src/sys/wasi/mod.rs

   1 //! System bindings for the wasm/web platform
   2 //!
   3 //! This module contains the facade (aka platform-specific) implementations of
   4 //! OS level functionality for wasm. Note that this wasm is *not* the emscripten
   5 //! wasm, so we have no runtime here.
   6 //!
   7 //! This is all super highly experimental and not actually intended for
   8 //! wide/production use yet, it's still all in the experimental category. This
   9 //! will likely change over time.
  10 //!
  11 //! Currently all functions here are basically stubs that immediately return
  12 //! errors. The hope is that with a portability lint we can turn actually just
  13 //! remove all this and just omit parts of the standard library if we're
  14 //! compiling for wasm. That way it's a compile time error for something that's
  15 //! guaranteed to be a runtime error!
  16
  17 use crate::io as std_io;
  18 use crate::mem;
  19
  20 #[path = "../unix/alloc.rs"]
  21 pub mod alloc;
  22 pub mod args;
  23 #[path = "../unsupported/cmath.rs"]
  24 pub mod cmath;
  25 #[path = "../unsupported/condvar.rs"]
  26 pub mod condvar;
  27 pub mod env;
  28 pub mod fd;
  29 pub mod fs;
  30 pub mod io;
  31 #[path = "../unsupported/mutex.rs"]
  32 pub mod mutex;
  33 pub mod net;
  34 pub mod os;
  35 pub use crate::sys_common::os_str_bytes as os_str;
  36 pub mod ext;
  37 #[path = "../unix/path.rs"]
  38 pub mod path;
  39 #[path = "../unsupported/pipe.rs"]
  40 pub mod pipe;
  41 #[path = "../unsupported/process.rs"]
  42 pub mod process;
  43 #[path = "../unsupported/rwlock.rs"]
  44 pub mod rwlock;
  45 #[path = "../unsupported/stack_overflow.rs"]
  46 pub mod stack_overflow;
  47 pub mod stdio;
  48 pub mod thread;
  49 #[path = "../unsupported/thread_local_dtor.rs"]
  50 pub mod thread_local_dtor;
  51 #[path = "../unsupported/thread_local_key.rs"]
  52 pub mod thread_local_key;
  53 pub mod time;
  54
  55 #[path = "../unsupported/common.rs"]
  56 #[allow(unused)]
  57 mod common;
  58 pub use common::*;
  59
  60 pub fn decode_error_kind(errno: i32) -> std_io::ErrorKind {
  61     use std_io::ErrorKind::*;
  62     if errno > u16::MAX as i32 || errno < 0 {
  63         return Other;
  64     }
  65     match errno as u16 {
  66         wasi::ERRNO_CONNREFUSED => ConnectionRefused,
  67         wasi::ERRNO_CONNRESET => ConnectionReset,
  68         wasi::ERRNO_PERM | wasi::ERRNO_ACCES => PermissionDenied,
  69         wasi::ERRNO_PIPE => BrokenPipe,
  70         wasi::ERRNO_NOTCONN => NotConnected,
  71         wasi::ERRNO_CONNABORTED => ConnectionAborted,
  72         wasi::ERRNO_ADDRNOTAVAIL => AddrNotAvailable,
  73         wasi::ERRNO_ADDRINUSE => AddrInUse,
  74         wasi::ERRNO_NOENT => NotFound,
  75         wasi::ERRNO_INTR => Interrupted,
  76         wasi::ERRNO_INVAL => InvalidInput,
  77         wasi::ERRNO_TIMEDOUT => TimedOut,
  78         wasi::ERRNO_EXIST => AlreadyExists,
  79         wasi::ERRNO_AGAIN => WouldBlock,
  80         _ => Other,
  81     }
  82 }
  83
  84 pub fn abort_internal() -> ! {
  85     unsafe { libc::abort() }
  86 }
  87
  88 pub fn hashmap_random_keys() -> (u64, u64) {
  89     let mut ret = (0u64, 0u64);
  90     unsafe {
  91         let base = &mut ret as *mut (u64, u64) as *mut u8;
  92         let len = mem::size_of_val(&ret);
  93         wasi::random_get(base, len).expect("random_get failure");
  94     }
  95     return ret;
  96 }
  97
  98 fn err2io(err: wasi::Error) -> std_io::Error {
  99     std_io::Error::from_raw_os_error(err.raw_error().into())
 100 }