}
let this = self.eval_context_mut();
+ // Don't forget the bounds check.
let ptr = this.memory.check_ptr_access(
ptr,
Size::from_bytes(len as u64),
Ok(())
}
+ /// Sets the last error variable.
+ fn set_last_error(&mut self, scalar: Scalar<Tag>) -> InterpResult<'tcx> {
+ let this = self.eval_context_mut();
+ let errno_place = this.machine.last_error.unwrap();
+ this.write_scalar(scalar, errno_place.into())
+ }
+
+ /// Gets the last error variable.
+ fn get_last_error(&mut self) -> InterpResult<'tcx, Scalar<Tag>> {
+ let this = self.eval_context_mut();
+ let errno_place = this.machine.last_error.unwrap();
+ this.read_scalar(errno_place.into())?.not_undef()
+ }
+
+ /// Sets the last OS error using a `std::io::Error`. This function tries to produce the most
+ /// similar OS error from the `std::io::ErrorKind` and sets it as the last OS error.
+ fn set_last_error_from_io_error(&mut self, e: std::io::Error) -> InterpResult<'tcx> {
+ use std::io::ErrorKind::*;
+ let this = self.eval_context_mut();
+ let target = &this.tcx.tcx.sess.target.target;
+ let last_error = if target.options.target_family == Some("unix".to_owned()) {
+ this.eval_libc(match e.kind() {
+ ConnectionRefused => "ECONNREFUSED",
+ ConnectionReset => "ECONNRESET",
+ PermissionDenied => "EPERM",
+ BrokenPipe => "EPIPE",
+ NotConnected => "ENOTCONN",
+ ConnectionAborted => "ECONNABORTED",
+ AddrNotAvailable => "EADDRNOTAVAIL",
+ AddrInUse => "EADDRINUSE",
+ NotFound => "ENOENT",
+ Interrupted => "EINTR",
+ InvalidInput => "EINVAL",
+ TimedOut => "ETIMEDOUT",
+ AlreadyExists => "EEXIST",
+ WouldBlock => "EWOULDBLOCK",
+ _ => throw_unsup_format!("The {} error cannot be transformed into a raw os error", e)
+ })?
+ } else {
+ // FIXME: we have to implement the windows' equivalent of this.
+ throw_unsup_format!("Setting the last OS error from an io::Error is unsupported for {}.", target.target_os)
+ };
+ this.set_last_error(last_error)
+ }
+
+ /// Helper function that consumes an `std::io::Result<T>` and returns an
+ /// `InterpResult<'tcx,T>::Ok` instead. In case the result is an error, this function returns
+ /// `Ok(-1)` and sets the last OS error accordingly.
+ ///
+ /// This function uses `T: From<i32>` instead of `i32` directly because some IO related
+ /// functions return different integer types (like `read`, that returns an `i64`)
+ fn try_unwrap_io_result<T: From<i32>>(
+ &mut self,
+ result: std::io::Result<T>,
+ ) -> InterpResult<'tcx, T> {
+ match result {
+ Ok(ok) => Ok(ok),
+ Err(e) => {
+ self.eval_context_mut().set_last_error_from_io_error(e)?;
+ Ok((-1).into())
+ }
+ }
+ }
+
/// Helper function to read an OsString from a null-terminated sequence of bytes, which is what
/// the Unix APIs usually handle.
fn read_os_string_from_c_string(&mut self, scalar: Scalar<Tag>) -> InterpResult<'tcx, OsString> {