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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);
}
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