hmmmm

src/collection/processes/linux/gpu.rs

@@ -0,0 +1,44 @@
+//! Extract GPU process information on Linux.
+
+use std::{os::fd::BorrowedFd, path::Path};
+
+use hashbrown::HashSet;
+use rustix::fs::{Mode, OFlags};
+
+use crate::collection::processes::Pid;
+
+fn is_drm_fd(fd: &BorrowedFd<'_>) -> bool {
+    true
+}
+
+/// Get fdinfo for a process given the PID.
+///
+/// Based on the method from nvtop [here](https://github.com/Syllo/nvtop/blob/339ee0b10a64ec51f43d27357b0068a40f16e9e4/src/extract_processinfo_fdinfo.c#L101).
+pub(crate) fn get_fdinfo(pid: Pid, seen_fds: &mut HashSet<u32>) {
+    let fdinfo_path = format!("/proc/{pid}/fdinfo");
+    let fdinfo_path = Path::new(&fdinfo_path);
+
+    let Ok(fd_entries) = std::fs::read_dir(fdinfo_path) else {
+        return;
+    };
+
+    for fd_entry in fd_entries.flatten() {
+        let path = fd_entry.path();
+
+        if !path.is_file() {
+            continue;
+        }
+
+        if !(path.to_string_lossy().chars().all(|c| c.is_ascii_digit())) {
+            continue;
+        }
+
+        let Ok(fd) = rustix::fs::openat(
+            pid_path.as_path(),
+            OFlags::PATH | OFlags::DIRECTORY | OFlags::CLOEXEC,
+            Mode::empty(),
+        ) else {
+            continue;
+        };
+    }
+}

src/collection/processes/linux/mod.rs

@@ -1,5 +1,6 @@
 //! Process data collection for Linux.
 
+mod gpu;
 mod process;
 
 use std::{