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use std::fs;
use std::io::{Read, Write};
use std::time::Duration;
const TARGET: &str = "gpu-screen-recorder";
const POLL_INTERVAL: Duration = Duration::from_secs(2);
/// Scans /proc for a process whose argv[0] basename matches the target.
/// Reads cmdline (not the truncated `comm`) to avoid false positives
/// from the 15-char comm truncation matching an unrelated binary.
fn is_recording() -> bool {
let entries = match fs::read_dir("/proc") {
Ok(d) => d,
Err(_) => return false,
};
for entry in entries.flatten() {
let name = entry.file_name();
let Some(pid_str) = name.to_str() else {
continue;
};
if !pid_str.bytes().all(|b| b.is_ascii_digit()) {
continue;
}
let mut buf = Vec::with_capacity(64);
if fs::File::open(format!("/proc/{pid_str}/cmdline"))
.and_then(|mut f| f.read_to_end(&mut buf))
.is_err()
{
continue;
}
// cmdline is NUL-separated; argv[0] is everything before the first NUL
let argv0 = buf.split(|&b| b == 0).next().unwrap_or(&[]);
let argv0 = String::from_utf8_lossy(argv0);
let basename = argv0.rsplit('/').next().unwrap_or(&argv0);
if basename == TARGET {
return true;
}
}
false
}
fn emit(recording: bool) {
let json = if recording {
r#"{"text":" <span color='#aaaaaa'>Recording</span>","class":"recording","alt":"recording","tooltip":"gpu-screen-recorder is running"}"#
} else {
r#"{"text":"","class":"idle","alt":"idle","tooltip":""}"#
};
println!("{json}");
let _ = std::io::stdout().flush();
}
fn main() {
let mut last: Option<bool> = None;
loop {
let now = is_recording();
if last != Some(now) {
emit(now);
last = Some(now);
}
std::thread::sleep(POLL_INTERVAL);
}
}
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