test_resource.rs - mozsearch

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use nix::sys::resource::{getrlimit, setrlimit, Resource};

use nix::sys::resource::{getrusage, UsageWho};

/// Tests the RLIMIT_NOFILE functionality of getrlimit(), where the resource RLIMIT_NOFILE refers

/// to the maximum file descriptor number that can be opened by the process (aka the maximum number

/// of file descriptors that the process can open, since Linux 4.5).

///

/// We first fetch the existing file descriptor maximum values using getrlimit(), then edit the

/// soft limit to make sure it has a new and distinct value to the hard limit. We then setrlimit()

/// to put the new soft limit in effect, and then getrlimit() once more to ensure the limits have

/// been updated.

#[test]

pub fn test_resource_limits_nofile() {

    let (mut soft_limit, hard_limit) =

        getrlimit(Resource::RLIMIT_NOFILE).unwrap();

    soft_limit -= 1;

    assert_ne!(soft_limit, hard_limit);

    setrlimit(Resource::RLIMIT_NOFILE, soft_limit, hard_limit).unwrap();

    let (new_soft_limit, _) = getrlimit(Resource::RLIMIT_NOFILE).unwrap();

    assert_eq!(new_soft_limit, soft_limit);

#[test]

pub fn test_self_cpu_time() {

    // Make sure some CPU time is used.

    let mut numbers: Vec<i32> = (1..1_000_000).collect();

    numbers.iter_mut().for_each(|item| *item *= 2);

    // FIXME: this is here to help ensure the compiler does not optimize the whole

    // thing away. Replace the assert with test::black_box once stabilized.

    assert_eq!(numbers[100..200].iter().sum::<i32>(), 30_100);

    let usage = getrusage(UsageWho::RUSAGE_SELF)

        .expect("Failed to call getrusage for SELF");

    let rusage = usage.as_ref();

    let user = usage.user_time();

    assert!(user.tv_sec() > 0 || user.tv_usec() > 0);

    assert_eq!(user.tv_sec(), rusage.ru_utime.tv_sec);

    assert_eq!(user.tv_usec(), rusage.ru_utime.tv_usec);