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Add Timespec comment and assert about negative nsec

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Chris Peterson 2013-01-21 20:50:01 -08:00
parent 012364bc5f
commit f5a3ce687d
1 changed files with 11 additions and 0 deletions
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11
src/libstd/time.rs
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@ -20,6 +20,8 @@ use core::prelude::*;
use core::result::{Result, Ok, Err};
use core::str;
const NSEC_PER_SEC: i32 = 1_000_000_000_i32;
#[abi = "cdecl"]
extern mod rustrt {
#[legacy_exports]
@ -40,8 +42,17 @@ extern mod rustrt {
#[auto_decode]
pub struct Timespec { sec: i64, nsec: i32 }
/*
* Timespec assumes that pre-epoch Timespecs have negative sec and positive
* nsec fields. Darwin's and Linux's struct timespec functions handle pre-
* epoch timestamps using a "two steps back, one step forward" representation,
* though the man pages do not actually document this. For example, the time
* -1.2 seconds before the epoch is represented by `Timespec { sec: -2_i64,
* nsec: 800_000_000_i32 }`.
*/
impl Timespec {
static pure fn new(sec: i64, nsec: i32) -> Timespec {
assert nsec >= 0 && nsec < NSEC_PER_SEC;
Timespec { sec: sec, nsec: nsec }
}
}