Skip pidfd testing on unsupported linux kernel

Only Linux kernel >= 5.10 support pidfd

Signed-off-by: Jiahao XU <[email protected]>

tokio/src/process/unix/pidfd_reaper.rs

@@ -177,7 +177,7 @@ where
 mod test {
  use super::*;
  use crate::runtime::{Builder as RuntimeBuilder, Runtime};
- use std::process::Command;
+ use std::process::{Command, Output};
 
  fn create_runtime() -> Runtime {
  RuntimeBuilder::new_current_thread()
@@ -190,8 +190,25 @@ mod test {
  create_runtime().block_on(fut)
  }
 
+ fn is_pidfd_available() -> bool {
+ let Output { stdout, status, .. } = Command::new("uname").arg("-r").output().unwrap();
+ assert!(status.success());
+ let stdout = String::from_utf8_lossy(&stdout);
+
+ let mut kernel_version_iter = stdout.split_once('-').unwrap().0.split('.');
+ let major = kernel_version_iter.next().unwrap();
+ let minor = kernel_version_iter.next().unwrap();
+
+ major >= 6 || (major == 5 && minor >= 10)
+ }
+
  #[test]
  fn test_pidfd_reaper_poll() {
+ if !is_pidfd_available() {
+ eprintln!("pidfd is not available on this linux kernel, skip this test");
+ return;
+ }
+
  run_test(async {
  let child = Command::new("true").spawn().unwrap();
  let pidfd_reaper = PidfdReaper::new(child).unwrap();
@@ -203,6 +220,11 @@ mod test {
 
  #[test]
  fn test_pidfd_reaper_kill() {
+ if !is_pidfd_available() {
+ eprintln!("pidfd is not available on this linux kernel, skip this test");
+ return;
+ }
+
  run_test(async {
  let child = Command::new("sleep").arg("1800").spawn().unwrap();
  let mut pidfd_reaper = PidfdReaper::new(child).unwrap();
@@ -216,6 +238,11 @@ mod test {
 
  #[test]
  fn test_pidfd_reaper_drop() {
+ if !is_pidfd_available() {
+ eprintln!("pidfd is not available on this linux kernel, skip this test");
+ return;
+ }
+
  run_test(async {
  let child = Command::new("true").spawn().unwrap();
  let _pidfd_reaper = PidfdReaper::new(child).unwrap();