Yet more stuff. Direct IO is not working at all.

src/io.rs

@@ -1,5 +1,6 @@
 use std::fs::{File, OpenOptions};
 use std::io::{self, Seek, SeekFrom};
+use std::os::unix::fs::{FileExt, OpenOptionsExt};
 
 use crate::cli::CONFIG;
 
@@ -22,8 +23,18 @@ pub fn get_stream_length<S: Seek>(stream: &mut S) -> io::Result<u64> {
 pub fn load_input() -> anyhow::Result<File> {
     OpenOptions::new()
         .read(true)
+        //.custom_flags(libc::O_DIRECT)
         .open(&CONFIG.input)
         .with_context(|| format!("Failed to open input file: {}", &CONFIG.input.display()))
+
+    /*
+    use std::ffi::CString;
+    use std::os::fd::FromRawFd;
+
+    let path = CString::new(CONFIG.input.to_str().unwrap().to_owned()).unwrap();
+    let flags = libc::O_DIRECT | libc::O_RDONLY;
+    let f = unsafe { File::from_raw_fd(libc::open(path.as_ptr(), flags)) };
+    */
 }
 
 pub fn load_output() -> anyhow::Result<File> {
@@ -40,16 +51,10 @@ pub fn load_output() -> anyhow::Result<File> {
         })
 }
 
-pub fn load_map_read() -> anyhow::Result<File> {
+pub fn load_map_read() -> std::io::Result<File> {
     OpenOptions::new()
         .read(true)
         .open(crate::path::MAP_PATH.clone())
-        .with_context(|| {
-            format!(
-                "Failed to open/create mapping file at: {}",
-                crate::path::MAP_PATH.display()
-            )
-        })
 }
 
 pub fn load_map_write() -> anyhow::Result<File> {