fd >= 0 && fd <= 2

src/hypercall.rs

@@ -138,6 +138,8 @@ pub fn open(mem: &MmapMemory, sysopen: &mut OpenParams, file_map: &mut UhyveFile
 			let host_path_c_string = file_map.create_temporary_file(guest_path);
 			let new_host_path = host_path_c_string.as_c_str().as_ptr();
 			sysopen.ret = unsafe { libc::open(new_host_path, flags, sysopen.mode) };
+			let ret = sysopen.ret;
+			error!("{:#?}", ret);
 			if sysopen.ret >= 0 {
 				file_map.insert_fd_path(sysopen.ret.into_raw_fd(), guest_path);
 			}
@@ -187,6 +189,8 @@ pub fn write<B: VirtualizationBackend>(
 	syswrite: &WriteParams,
 	file_map: &mut UhyveFileMap,
 ) -> io::Result<()> {
+	let fd = syswrite.fd;
+	error!("{:#?}", fd);
 	let mut bytes_written: usize = 0;
 	while bytes_written != syswrite.len {
 		let guest_phys_addr = virt_to_phys(

src/isolation/filemap.rs

@@ -63,6 +63,7 @@ impl UhyveFileMap {
 	/// * `guest_path` - The guest path that is to be looked up in the map.
 	pub fn get_host_path(&mut self, guest_path: &str) -> Option<OsString> {
 		let host_path = self.files.get(guest_path).map(OsString::from);
+		debug!("get_host_path (host_path): {:#?}", host_path);
 		if host_path.is_some() {
 			host_path
 		} else {
@@ -112,14 +113,15 @@ impl UhyveFileMap {
 			.path()
 			.join(Uuid::new_v4().to_string())
 			.into_os_string();
+		debug!("create_temporary_file (host_path): {:#?}", host_path);
 		let ret = CString::new(host_path.as_bytes()).unwrap();
 		self.files.insert(String::from(guest_path), host_path);
 		ret
 	}
 
 	pub fn get_fd_presence(&mut self, fd: RawFd) -> bool {
 		debug!("get_fd_presence: {:#?}", &self.fdmap);
-		if fd >= 0 && self.fdmap.contains_left(&fd) {
+		if (fd >= 0 && self.fdmap.contains_left(&fd)) || (fd >= 0 && fd <= 2) {
 			return true;
 		}
 		false
@@ -131,7 +133,7 @@ impl UhyveFileMap {
 	/// * `guest_path` - The guest path.
 	pub fn insert_fd_path(&mut self, fd: RawFd, guest_path: &str) {
 		debug!("insert_fd_path: {:#?}", &self.fdmap);
-		if fd >= 0 {
+		if fd > 2 {
 			self.fdmap.insert(fd, guest_path.into());
 		}
 	}
@@ -143,7 +145,7 @@ impl UhyveFileMap {
 	/// * `fd` - The file descriptor of the file being removed.
 	pub fn remove_fd(&mut self, fd: RawFd) {
 		debug!("remove_fd: {:#?}", &self.fdmap);
-		if fd >= 0 {
+		if fd > 2 {
 			self.fdmap.remove_by_left(&fd);
 		}
 	}