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 #[path = "../unix/cmath.rs"]
  24 pub mod cmath;
  25 pub mod condvar;
  26 pub mod env;
  27 pub mod ext;
  28 pub mod fd;
  29 pub mod fs;
  30 #[path = "../unsupported/io.rs"]
  31 pub mod io;
  32 pub mod memchr;
  33 pub mod mutex;
  34 pub mod net;
  35 pub mod os;
  36 #[path = "../unix/path.rs"]
  37 pub mod path;
  38 #[path = "../unsupported/pipe.rs"]
  39 pub mod pipe;
  40 #[path = "../unsupported/process.rs"]
  41 pub mod process;
  42 pub mod rwlock;
  43 pub mod stdio;
  44 pub mod thread;
  45 pub mod thread_local_dtor;
  46 #[path = "../unsupported/thread_local_key.rs"]
  47 pub mod thread_local_key;
  48 pub mod time;
  49
  50 use crate::io::ErrorKind;
  51 pub use crate::sys_common::os_str_bytes as os_str;
  52
  53 #[allow(unused_extern_crates)]
  54 pub extern crate hermit_abi as abi;
  55
  56 pub fn unsupported<T>() -> crate::io::Result<T> {
  57     Err(unsupported_err())
  58 }
  59
  60 pub fn unsupported_err() -> crate::io::Error {
  61     crate::io::Error::new_const(
  62         crate::io::ErrorKind::Unsupported,
  63         &"operation not supported on HermitCore yet",
  64     )
  65 }
  66
  67 pub unsafe fn strlen(start: *const c_char) -> usize {
  68     let mut str = start;
  69
  70     while *str != 0 {
  71         str = str.offset(1);
  72     }
  73
  74     (str as usize) - (start as usize)
  75 }
  76
  77 #[no_mangle]
  78 pub extern "C" fn floor(x: f64) -> f64 {
  79     unsafe { intrinsics::floorf64(x) }
  80 }
  81
  82 pub fn abort_internal() -> ! {
  83     unsafe {
  84         abi::abort();
  85     }
  86 }
  87
  88 // FIXME: just a workaround to test the system
  89 pub fn hashmap_random_keys() -> (u64, u64) {
  90     (1, 2)
  91 }
  92
  93 // This function is needed by the panic runtime. The symbol is named in
  94 // pre-link args for the target specification, so keep that in sync.
  95 #[cfg(not(test))]
  96 #[no_mangle]
  97 // NB. used by both libunwind and libpanic_abort
  98 pub extern "C" fn __rust_abort() {
  99     abort_internal();
 100 }
 101
 102 // SAFETY: must be called only once during runtime initialization.
 103 // NOTE: this is not guaranteed to run, for example when Rust code is called externally.
 104 pub unsafe fn init(argc: isize, argv: *const *const u8) {
 105     let _ = net::init();
 106     args::init(argc, argv);
 107 }
 108
 109 // SAFETY: must be called only once during runtime cleanup.
 110 // NOTE: this is not guaranteed to run, for example when the program aborts.
 111 pub unsafe fn cleanup() {
 112     args::cleanup();
 113 }
 114
 115 #[cfg(not(test))]
 116 #[no_mangle]
 117 pub unsafe extern "C" fn runtime_entry(
 118     argc: i32,
 119     argv: *const *const c_char,
 120     env: *const *const c_char,
 121 ) -> ! {
 122     use crate::sys::hermit::thread_local_dtor::run_dtors;
 123     extern "C" {
 124         fn main(argc: isize, argv: *const *const c_char) -> i32;
 125     }
 126
 127     // initialize environment
 128     os::init_environment(env as *const *const i8);
 129
 130     let result = main(argc as isize, argv);
 131
 132     run_dtors();
 133     abi::exit(result);
 134 }
 135
 136 pub fn decode_error_kind(errno: i32) -> ErrorKind {
 137     match errno {
 138         x if x == 13 as i32 => ErrorKind::PermissionDenied,
 139         x if x == 98 as i32 => ErrorKind::AddrInUse,
 140         x if x == 99 as i32 => ErrorKind::AddrNotAvailable,
 141         x if x == 11 as i32 => ErrorKind::WouldBlock,
 142         x if x == 103 as i32 => ErrorKind::ConnectionAborted,
 143         x if x == 111 as i32 => ErrorKind::ConnectionRefused,
 144         x if x == 104 as i32 => ErrorKind::ConnectionReset,
 145         x if x == 17 as i32 => ErrorKind::AlreadyExists,
 146         x if x == 4 as i32 => ErrorKind::Interrupted,
 147         x if x == 22 as i32 => ErrorKind::InvalidInput,
 148         x if x == 2 as i32 => ErrorKind::NotFound,
 149         x if x == 107 as i32 => ErrorKind::NotConnected,
 150         x if x == 1 as i32 => ErrorKind::PermissionDenied,
 151         x if x == 32 as i32 => ErrorKind::BrokenPipe,
 152         x if x == 110 as i32 => ErrorKind::TimedOut,
 153         _ => ErrorKind::Other,
 154     }
 155 }
 156
 157 pub fn cvt(result: i32) -> crate::io::Result<usize> {
 158     if result < 0 { Err(crate::io::Error::from_raw_os_error(-result)) } else { Ok(result as usize) }
 159 }