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

   1 //! System bindings for HermitCore
   2 //!
   3 //! This module contains the facade (aka platform-specific) implementations of
   4 //! OS level functionality for HermitCore.
   5 //!
   6 //! This is all super highly experimental and not actually intended for
   7 //! wide/production use yet, it's still all in the experimental category. This
   8 //! will likely change over time.
   9 //!
  10 //! Currently all functions here are basically stubs that immediately return
  11 //! errors. The hope is that with a portability lint we can turn actually just
  12 //! remove all this and just omit parts of the standard library if we're
  13 //! compiling for wasm. That way it's a compile time error for something that's
  14 //! guaranteed to be a runtime error!
  15
  16 #![allow(unsafe_op_in_unsafe_fn)]
  17
  18 use crate::intrinsics;
  19 use crate::os::raw::c_char;
  20
  21 pub mod alloc;
  22 pub mod args;
  23 pub mod cmath;
  24 pub mod condvar;
  25 pub mod env;
  26 pub mod ext;
  27 pub mod fd;
  28 pub mod fs;
  29 pub mod io;
  30 pub mod memchr;
  31 pub mod mutex;
  32 pub mod net;
  33 pub mod os;
  34 pub mod path;
  35 #[path = "../unsupported/pipe.rs"]
  36 pub mod pipe;
  37 #[path = "../unsupported/process.rs"]
  38 pub mod process;
  39 pub mod rwlock;
  40 pub mod stack_overflow;
  41 pub mod stdio;
  42 pub mod thread;
  43 pub mod thread_local_dtor;
  44 pub mod thread_local_key;
  45 pub mod time;
  46
  47 use crate::io::ErrorKind;
  48 pub use crate::sys_common::os_str_bytes as os_str;
  49
  50 #[allow(unused_extern_crates)]
  51 pub extern crate hermit_abi as abi;
  52
  53 pub fn unsupported<T>() -> crate::io::Result<T> {
  54     Err(unsupported_err())
  55 }
  56
  57 pub fn unsupported_err() -> crate::io::Error {
  58     crate::io::Error::new(crate::io::ErrorKind::Other, "operation not supported on HermitCore yet")
  59 }
  60
  61 // This enum is used as the storage for a bunch of types which can't actually
  62 // exist.
  63 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
  64 pub enum Void {}
  65
  66 pub unsafe fn strlen(start: *const c_char) -> usize {
  67     let mut str = start;
  68
  69     while *str != 0 {
  70         str = str.offset(1);
  71     }
  72
  73     (str as usize) - (start as usize)
  74 }
  75
  76 #[no_mangle]
  77 pub extern "C" fn floor(x: f64) -> f64 {
  78     unsafe { intrinsics::floorf64(x) }
  79 }
  80
  81 pub fn abort_internal() -> ! {
  82     unsafe {
  83         abi::abort();
  84     }
  85 }
  86
  87 // FIXME: just a workaround to test the system
  88 pub fn hashmap_random_keys() -> (u64, u64) {
  89     (1, 2)
  90 }
  91
  92 // This function is needed by the panic runtime. The symbol is named in
  93 // pre-link args for the target specification, so keep that in sync.
  94 #[cfg(not(test))]
  95 #[no_mangle]
  96 // NB. used by both libunwind and libpanic_abort
  97 pub extern "C" fn __rust_abort() {
  98     abort_internal();
  99 }
 100
 101 #[cfg(not(test))]
 102 pub fn init() {
 103     let _ = net::init();
 104 }
 105
 106 #[cfg(not(test))]
 107 #[no_mangle]
 108 pub unsafe extern "C" fn runtime_entry(
 109     argc: i32,
 110     argv: *const *const c_char,
 111     env: *const *const c_char,
 112 ) -> ! {
 113     use crate::sys::hermit::thread_local_dtor::run_dtors;
 114     extern "C" {
 115         fn main(argc: isize, argv: *const *const c_char) -> i32;
 116     }
 117
 118     // initialize environment
 119     os::init_environment(env as *const *const i8);
 120
 121     let result = main(argc as isize, argv);
 122
 123     run_dtors();
 124     abi::exit(result);
 125 }
 126
 127 pub fn decode_error_kind(errno: i32) -> ErrorKind {
 128     match errno {
 129         x if x == 13 as i32 => ErrorKind::PermissionDenied,
 130         x if x == 98 as i32 => ErrorKind::AddrInUse,
 131         x if x == 99 as i32 => ErrorKind::AddrNotAvailable,
 132         x if x == 11 as i32 => ErrorKind::WouldBlock,
 133         x if x == 103 as i32 => ErrorKind::ConnectionAborted,
 134         x if x == 111 as i32 => ErrorKind::ConnectionRefused,
 135         x if x == 104 as i32 => ErrorKind::ConnectionReset,
 136         x if x == 17 as i32 => ErrorKind::AlreadyExists,
 137         x if x == 4 as i32 => ErrorKind::Interrupted,
 138         x if x == 22 as i32 => ErrorKind::InvalidInput,
 139         x if x == 2 as i32 => ErrorKind::NotFound,
 140         x if x == 107 as i32 => ErrorKind::NotConnected,
 141         x if x == 1 as i32 => ErrorKind::PermissionDenied,
 142         x if x == 32 as i32 => ErrorKind::BrokenPipe,
 143         x if x == 110 as i32 => ErrorKind::TimedOut,
 144         _ => ErrorKind::Other,
 145     }
 146 }
 147
 148 pub fn cvt(result: i32) -> crate::io::Result<usize> {
 149     if result < 0 { Err(crate::io::Error::from_raw_os_error(-result)) } else { Ok(result as usize) }
 150 }