1 files changed, 113 insertions, 0 deletions
diff --git a/third_party/rust/lucet-wasi-wasmsbx/src/hostcalls/timers.rs b/third_party/rust/lucet-wasi-wasmsbx/src/hostcalls/timers.rs
new file mode 100644
index 0000000000..926a998445
--- /dev/null
+++ b/third_party/rust/lucet-wasi-wasmsbx/src/hostcalls/timers.rs
@@ -0,0 +1,113 @@
+use nix::libc::{self, c_int, c_char};
+
+#[cfg(not(target_os = "macos"))]
+mod notmac
+{
+    use super::*;
+
+    pub unsafe fn clock_gettime_helper(clock_id: libc::clockid_t, tp: *mut libc::timespec) -> c_int {
+        libc::clock_gettime(clock_id, tp)
+    }
+
+    pub unsafe fn clock_getres_helper(clock_id: libc::clockid_t, res: *mut libc::timespec) -> c_int {
+        libc::clock_getres(clock_id, res)
+    }
+
+    pub unsafe fn futimens_helper(fd: c_int, times: *const libc::timespec) -> c_int {
+        libc::futimens(fd, times)
+    }
+
+    pub unsafe fn utimensat_helper(dirfd: c_int, path: *const c_char, times: *const libc::timespec, flag: c_int) -> c_int {
+        libc::utimensat(dirfd, path, times, flag)
+    }
+}
+
+#[cfg(target_os = "macos")]
+mod mac
+{
+    use super::*;
+    use std::mem::MaybeUninit;
+    use std::sync::Once;
+
+    use mach::mach_time::*;
+
+    // Referring these 3 sources
+    //https://stackoverflow.com/questions/5167269/clock-gettime-alternative-in-mac-os-x
+    //https://stackoverflow.com/questions/11680461/monotonic-clock-on-osx
+    //https://gist.github.com/lifthrasiir/393ffb3e9900709fa2e3ae2a540b635f
+
+    static mut CONVERSION_FACTOR : f64 = 0.0;
+    static INIT : Once = Once::new();
+
+    unsafe fn get_cached_conversion_factor() -> f64 {
+        unsafe {
+            INIT.call_once(|| {
+                let mut timebase = MaybeUninit::<mach_timebase_info_data_t>::uninit();
+                mach_timebase_info(timebase.as_mut_ptr());
+                let timebase = unsafe { timebase.assume_init() };
+            
+                let numer_d : f64 = timebase.numer as f64;
+                let denom_d : f64 = timebase.denom as f64;
+            
+                CONVERSION_FACTOR = numer_d / denom_d;
+            });
+        }
+        CONVERSION_FACTOR
+    }
+
+    pub unsafe fn clock_gettime_helper(clock_id: libc::clockid_t, tp: *mut libc::timespec) -> c_int {
+        if !(clock_id == libc::CLOCK_REALTIME || clock_id == libc::CLOCK_MONOTONIC) {
+            (*libc::__error()) = libc::EINVAL;
+            return -1;
+        }
+
+        if clock_id == libc::CLOCK_REALTIME {
+            let mut micro = MaybeUninit::<libc::timeval>::uninit();
+            libc::gettimeofday(micro.as_mut_ptr(), core::ptr::null_mut());
+            let micro = unsafe { micro.assume_init() };
+      
+            (*tp).tv_sec = micro.tv_sec;
+            (*tp).tv_nsec = i64::from(micro.tv_usec) * 1000;
+            return 0;
+        } else {
+            let time : u64 = mach_absolute_time();
+            let time_d : f64 = time as f64;
+            let conv : f64 = get_cached_conversion_factor();
+            let nseconds : f64 = time_d * conv;
+            let seconds : f64 = nseconds / 1e9;
+            (*tp).tv_sec = seconds as i64;
+            (*tp).tv_nsec = nseconds as i64;
+            return 0;
+        }
+    }
+
+    pub unsafe fn clock_getres_helper(clock_id: libc::clockid_t, res: *mut libc::timespec) -> c_int {
+        if !(clock_id == libc::CLOCK_REALTIME || clock_id == libc::CLOCK_MONOTONIC) {
+            (*libc::__error()) = libc::EINVAL;
+            return -1;
+        }
+
+        (*res).tv_sec = 0 as i64;
+        (*res).tv_nsec = 
+            if clock_id == libc::CLOCK_REALTIME {
+                1000 as i64
+            } else {
+                1 as i64
+            };
+        return 0;
+    }
+
+    pub unsafe fn futimens_helper(_fd: c_int, _times: *const libc::timespec) -> c_int {
+        panic!("futimens not implemented");
+    }
+
+    pub unsafe fn utimensat_helper(_dirfd: c_int, _path: *const c_char, _times: *const libc::timespec, _flag: c_int) -> c_int {
+        panic!("utimensat not implemented");
+    }
+}
+
+#[cfg(not(target_os = "macos"))]
+pub use notmac::*;
+
+#[cfg(target_os = "macos")]
+pub use mac::*;
+\ No newline at end of file