src/libstd/sys/sgx/os.rs

   1 use fortanix_sgx_abi::{Error, RESULT_SUCCESS};
   2
   3 use crate::collections::HashMap;
   4 use crate::error::Error as StdError;
   5 use crate::ffi::{OsStr, OsString};
   6 use crate::fmt;
   7 use crate::io;
   8 use crate::path::{self, PathBuf};
   9 use crate::str;
  10 use crate::sync::atomic::{AtomicUsize, Ordering};
  11 use crate::sync::Mutex;
  12 use crate::sync::Once;
  13 use crate::sys::{decode_error_kind, sgx_ineffective, unsupported, Void};
  14 use crate::vec;
  15
  16 pub fn errno() -> i32 {
  17     RESULT_SUCCESS
  18 }
  19
  20 pub fn error_string(errno: i32) -> String {
  21     if errno == RESULT_SUCCESS {
  22         "operation succesful".into()
  23     } else if ((Error::UserRangeStart as _)..=(Error::UserRangeEnd as _)).contains(&errno) {
  24         format!("user-specified error {:08x}", errno)
  25     } else {
  26         decode_error_kind(errno).as_str().into()
  27     }
  28 }
  29
  30 pub fn getcwd() -> io::Result<PathBuf> {
  31     unsupported()
  32 }
  33
  34 pub fn chdir(_: &path::Path) -> io::Result<()> {
  35     sgx_ineffective(())
  36 }
  37
  38 pub struct SplitPaths<'a>(&'a Void);
  39
  40 pub fn split_paths(_unparsed: &OsStr) -> SplitPaths<'_> {
  41     panic!("unsupported")
  42 }
  43
  44 impl<'a> Iterator for SplitPaths<'a> {
  45     type Item = PathBuf;
  46     fn next(&mut self) -> Option<PathBuf> {
  47         match *self.0 {}
  48     }
  49 }
  50
  51 #[derive(Debug)]
  52 pub struct JoinPathsError;
  53
  54 pub fn join_paths<I, T>(_paths: I) -> Result<OsString, JoinPathsError>
  55 where
  56     I: Iterator<Item = T>,
  57     T: AsRef<OsStr>,
  58 {
  59     Err(JoinPathsError)
  60 }
  61
  62 impl fmt::Display for JoinPathsError {
  63     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  64         "not supported in SGX yet".fmt(f)
  65     }
  66 }
  67
  68 impl StdError for JoinPathsError {
  69     fn description(&self) -> &str {
  70         "not supported in SGX yet"
  71     }
  72 }
  73
  74 pub fn current_exe() -> io::Result<PathBuf> {
  75     unsupported()
  76 }
  77
  78 #[cfg_attr(test, linkage = "available_externally")]
  79 #[export_name = "_ZN16__rust_internals3std3sys3sgx2os3ENVE"]
  80 static ENV: AtomicUsize = AtomicUsize::new(0);
  81 #[cfg_attr(test, linkage = "available_externally")]
  82 #[export_name = "_ZN16__rust_internals3std3sys3sgx2os8ENV_INITE"]
  83 static ENV_INIT: Once = Once::new();
  84 type EnvStore = Mutex<HashMap<OsString, OsString>>;
  85
  86 fn get_env_store() -> Option<&'static EnvStore> {
  87     unsafe { (ENV.load(Ordering::Relaxed) as *const EnvStore).as_ref() }
  88 }
  89
  90 fn create_env_store() -> &'static EnvStore {
  91     ENV_INIT.call_once(|| {
  92         ENV.store(Box::into_raw(Box::new(EnvStore::default())) as _, Ordering::Relaxed)
  93     });
  94     unsafe { &*(ENV.load(Ordering::Relaxed) as *const EnvStore) }
  95 }
  96
  97 pub type Env = vec::IntoIter<(OsString, OsString)>;
  98
  99 pub fn env() -> Env {
 100     let clone_to_vec = |map: &HashMap<OsString, OsString>| -> Vec<_> {
 101         map.iter().map(|(k, v)| (k.clone(), v.clone())).collect()
 102     };
 103
 104     get_env_store().map(|env| clone_to_vec(&env.lock().unwrap())).unwrap_or_default().into_iter()
 105 }
 106
 107 pub fn getenv(k: &OsStr) -> io::Result<Option<OsString>> {
 108     Ok(get_env_store().and_then(|s| s.lock().unwrap().get(k).cloned()))
 109 }
 110
 111 pub fn setenv(k: &OsStr, v: &OsStr) -> io::Result<()> {
 112     let (k, v) = (k.to_owned(), v.to_owned());
 113     create_env_store().lock().unwrap().insert(k, v);
 114     Ok(())
 115 }
 116
 117 pub fn unsetenv(k: &OsStr) -> io::Result<()> {
 118     if let Some(env) = get_env_store() {
 119         env.lock().unwrap().remove(k);
 120     }
 121     Ok(())
 122 }
 123
 124 pub fn temp_dir() -> PathBuf {
 125     panic!("no filesystem in SGX")
 126 }
 127
 128 pub fn home_dir() -> Option<PathBuf> {
 129     None
 130 }
 131
 132 pub fn exit(code: i32) -> ! {
 133     super::abi::exit_with_code(code as _)
 134 }
 135
 136 pub fn getpid() -> u32 {
 137     panic!("no pids in SGX")
 138 }