1 files changed, 139 insertions, 0 deletions
diff --git a/library/std/src/sys/sgx/os.rs b/library/std/src/sys/sgx/os.rs
new file mode 100644
index 00000000000..56fc84b4a3f
--- /dev/null
+++ b/library/std/src/sys/sgx/os.rs
@@ -0,0 +1,139 @@
+use fortanix_sgx_abi::{Error, RESULT_SUCCESS};
+
+use crate::collections::HashMap;
+use crate::error::Error as StdError;
+use crate::ffi::{OsStr, OsString};
+use crate::fmt;
+use crate::io;
+use crate::path::{self, PathBuf};
+use crate::str;
+use crate::sync::atomic::{AtomicUsize, Ordering};
+use crate::sync::Mutex;
+use crate::sync::Once;
+use crate::sys::{decode_error_kind, sgx_ineffective, unsupported, Void};
+use crate::vec;
+
+pub fn errno() -> i32 {
+    RESULT_SUCCESS
+}
+
+pub fn error_string(errno: i32) -> String {
+    if errno == RESULT_SUCCESS {
+        "operation successful".into()
+    } else if ((Error::UserRangeStart as _)..=(Error::UserRangeEnd as _)).contains(&errno) {
+        format!("user-specified error {:08x}", errno)
+    } else {
+        decode_error_kind(errno).as_str().into()
+    }
+}
+
+pub fn getcwd() -> io::Result<PathBuf> {
+    unsupported()
+}
+
+pub fn chdir(_: &path::Path) -> io::Result<()> {
+    sgx_ineffective(())
+}
+
+pub struct SplitPaths<'a>(&'a Void);
+
+pub fn split_paths(_unparsed: &OsStr) -> SplitPaths<'_> {
+    panic!("unsupported")
+}
+
+impl<'a> Iterator for SplitPaths<'a> {
+    type Item = PathBuf;
+    fn next(&mut self) -> Option<PathBuf> {
+        match *self.0 {}
+    }
+}
+
+#[derive(Debug)]
+pub struct JoinPathsError;
+
+pub fn join_paths<I, T>(_paths: I) -> Result<OsString, JoinPathsError>
+where
+    I: Iterator<Item = T>,
+    T: AsRef<OsStr>,
+{
+    Err(JoinPathsError)
+}
+
+impl fmt::Display for JoinPathsError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        "not supported in SGX yet".fmt(f)
+    }
+}
+
+impl StdError for JoinPathsError {
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "not supported in SGX yet"
+    }
+}
+
+pub fn current_exe() -> io::Result<PathBuf> {
+    unsupported()
+}
+
+#[cfg_attr(test, linkage = "available_externally")]
+#[export_name = "_ZN16__rust_internals3std3sys3sgx2os3ENVE"]
+static ENV: AtomicUsize = AtomicUsize::new(0);
+#[cfg_attr(test, linkage = "available_externally")]
+#[export_name = "_ZN16__rust_internals3std3sys3sgx2os8ENV_INITE"]
+static ENV_INIT: Once = Once::new();
+type EnvStore = Mutex<HashMap<OsString, OsString>>;
+
+fn get_env_store() -> Option<&'static EnvStore> {
+    unsafe { (ENV.load(Ordering::Relaxed) as *const EnvStore).as_ref() }
+}
+
+fn create_env_store() -> &'static EnvStore {
+    ENV_INIT.call_once(|| {
+        ENV.store(Box::into_raw(Box::new(EnvStore::default())) as _, Ordering::Relaxed)
+    });
+    unsafe { &*(ENV.load(Ordering::Relaxed) as *const EnvStore) }
+}
+
+pub type Env = vec::IntoIter<(OsString, OsString)>;
+
+pub fn env() -> Env {
+    let clone_to_vec = |map: &HashMap<OsString, OsString>| -> Vec<_> {
+        map.iter().map(|(k, v)| (k.clone(), v.clone())).collect()
+    };
+
+    get_env_store().map(|env| clone_to_vec(&env.lock().unwrap())).unwrap_or_default().into_iter()
+}
+
+pub fn getenv(k: &OsStr) -> io::Result<Option<OsString>> {
+    Ok(get_env_store().and_then(|s| s.lock().unwrap().get(k).cloned()))
+}
+
+pub fn setenv(k: &OsStr, v: &OsStr) -> io::Result<()> {
+    let (k, v) = (k.to_owned(), v.to_owned());
+    create_env_store().lock().unwrap().insert(k, v);
+    Ok(())
+}
+
+pub fn unsetenv(k: &OsStr) -> io::Result<()> {
+    if let Some(env) = get_env_store() {
+        env.lock().unwrap().remove(k);
+    }
+    Ok(())
+}
+
+pub fn temp_dir() -> PathBuf {
+    panic!("no filesystem in SGX")
+}
+
+pub fn home_dir() -> Option<PathBuf> {
+    None
+}
+
+pub fn exit(code: i32) -> ! {
+    super::abi::exit_with_code(code as _)
+}
+
+pub fn getpid() -> u32 {
+    panic!("no pids in SGX")
+}