Logging

src/main.rs

@@ -82,9 +82,10 @@ impl Format {
                 const OUT: usize = reduce::mono::out_size(IN_SIZE);
                 let mut buf = [0u8; IN_SIZE];
                 loop {
-                    src.read_exact(&mut buf)?;
+                    src.read_exact(&mut buf)
+                        .context("while reading framebuffer")?;
                     reduce::mono::run(&mut buf);
-                    tgt.write_all(&buf[0..OUT])?;
+                    tgt.write_all(&buf[0..OUT]).context("while sending data")?;
                 }
             }
 
@@ -164,5 +165,7 @@ fn rm2_fb_offset(pid: usize) -> Result<usize> {
         .with_context(|| format!("Error parsing line in /proc/{}/maps", pid))?;
 
     let address = usize::from_str_radix(addr, 16).context("Error parsing framebuffer address")?;
+    println!("Found framebuffer at 0x{:X}", address);
+
     Ok(address + 8)
 }