Try #307:

lib/wasi/Cargo.toml

@@ -5,4 +5,6 @@ authors = ["The Wasmer Engineering Team <engineering@wasmer.io>"]
 edition = "2018"
 
 [dependencies]
-wasmer-runtime-core = { path = "../runtime-core", version = "0.2.1" }
+wasmer-runtime-core = { path = "../runtime-core", version = "0.2.1" }
+libc = "0.2.50"
+rand = "0.6.5"

lib/wasi/src/syscalls/mod.rs

@@ -1,14 +1,24 @@
 #![allow(unused)]
-
-mod types;
+pub mod types;
+#[cfg(any(target_os = "linux", target_os = "macos"))]
+pub mod unix;
+#[cfg(any(target_os = "windows"))]
+pub mod windows;
 
 use self::types::*;
 use crate::{
     ptr::{Array, WasmPtr},
     state::WasiState,
 };
+use rand::{thread_rng, Rng};
 use wasmer_runtime_core::{memory::Memory, vm::Ctx};
 
+#[cfg(any(target_os = "linux", target_os = "macos"))]
+pub use unix::*;
+
+#[cfg(any(target_os = "windows"))]
+pub use windows::*;
+
 #[allow(clippy::mut_from_ref)]
 fn get_wasi_state(ctx: &Ctx) -> &mut WasiState {
     unsafe { &mut *(ctx.data as *mut WasiState) }
@@ -99,15 +109,28 @@ pub fn clock_res_get(
     clock_id: __wasi_clockid_t,
     resolution: WasmPtr<__wasi_timestamp_t>,
 ) -> __wasi_errno_t {
-    unimplemented!()
+    let memory = ctx.memory(0);
+
+    if let Some(out_addr) = resolution.deref(memory) {
+        platform_clock_res_get(clock_id, out_addr)
+    } else {
+        __WASI_EFAULT
+    }
 }
+
 pub fn clock_time_get(
     ctx: &mut Ctx,
     clock_id: __wasi_clockid_t,
     precision: __wasi_timestamp_t,
     time: WasmPtr<__wasi_timestamp_t>,
 ) -> __wasi_errno_t {
-    unimplemented!()
+    let memory = ctx.memory(0);
+
+    if let Some(out_addr) = time.deref(memory) {
+        platform_clock_time_get(clock_id, precision, out_addr)
+    } else {
+        __WASI_EFAULT
+    }
 }
 
 /// ### `environ_get()`
@@ -429,12 +452,36 @@ pub fn proc_exit(ctx: &mut Ctx, rval: __wasi_exitcode_t) {
 pub fn proc_raise(ctx: &mut Ctx, sig: __wasi_signal_t) -> __wasi_errno_t {
     unimplemented!()
 }
+
+/// ### `random_get()`
+/// Fill buffer with high-quality random data.  This function may be slow and block
+/// Inputs:
+/// - `void *buf`
+///     A pointer to a buffer where the random bytes will be written
+/// - `size_t buf_len`
+///     The number of bytes that will be written
 pub fn random_get(ctx: &mut Ctx, buf: WasmPtr<u8, Array>, buf_len: u32) -> __wasi_errno_t {
-    unimplemented!()
+    let mut rng = thread_rng();
+    let memory = ctx.memory(0);
+
+    if let Some(buf) = buf.deref(memory, 0, buf_len) {
+        for i in 0..(buf_len as usize) {
+            let random_byte = rng.gen::<u8>();
+            buf[i].set(random_byte);
+        }
+    } else {
+        return __WASI_EFAULT;
+    }
+
+    __WASI_ESUCCESS
 }
+
+/// ### `sched_yield()`
+/// Yields execution of the thread
 pub fn sched_yield(ctx: &mut Ctx) -> __wasi_errno_t {
-    unimplemented!()
+    __WASI_ESUCCESS
 }
+
 pub fn sock_recv(
     ctx: &mut Ctx,
     sock: __wasi_fd_t,

lib/wasi/src/syscalls/unix/linux.rs

@@ -0,0 +1 @@
+

lib/wasi/src/syscalls/unix/macos.rs

@@ -0,0 +1 @@
+

lib/wasi/src/syscalls/unix/mod.rs

@@ -0,0 +1,71 @@
+#[cfg(target_os = "linux")]
+pub mod linux;
+
+#[cfg(target_os = "macos")]
+pub mod macos;
+
+#[cfg(target_os = "linux")]
+pub use linux::*;
+
+#[cfg(target_os = "macos")]
+pub use macos::*;
+
+use crate::syscalls::types::*;
+use libc::{
+    clock_getres, clock_gettime, timespec, CLOCK_MONOTONIC, CLOCK_PROCESS_CPUTIME_ID,
+    CLOCK_REALTIME, CLOCK_THREAD_CPUTIME_ID,
+};
+use std::cell::Cell;
+use std::mem;
+
+pub fn platform_clock_res_get(
+    clock_id: __wasi_clockid_t,
+    resolution: &Cell<__wasi_timestamp_t>,
+) -> __wasi_errno_t {
+    let unix_clock_id = match clock_id {
+        __WASI_CLOCK_MONOTONIC => CLOCK_MONOTONIC,
+        __WASI_CLOCK_PROCESS_CPUTIME_ID => CLOCK_PROCESS_CPUTIME_ID,
+        __WASI_CLOCK_REALTIME => CLOCK_REALTIME,
+        __WASI_CLOCK_THREAD_CPUTIME_ID => CLOCK_THREAD_CPUTIME_ID,
+        _ => return __WASI_EINVAL,
+    };
+
+    let (output, timespec_out) = unsafe {
+        let mut timespec_out: timespec = mem::uninitialized();
+        (clock_getres(unix_clock_id, &mut timespec_out), timespec_out)
+    };
+
+    resolution.set(timespec_out.tv_nsec as __wasi_timestamp_t);
+
+    // TODO: map output of clock_getres to __wasi_errno_t
+    __WASI_ESUCCESS
+}
+
+pub fn platform_clock_time_get(
+    clock_id: __wasi_clockid_t,
+    precision: __wasi_timestamp_t,
+    time: &Cell<__wasi_timestamp_t>,
+) -> __wasi_errno_t {
+    let unix_clock_id = match clock_id {
+        __WASI_CLOCK_MONOTONIC => CLOCK_MONOTONIC,
+        __WASI_CLOCK_PROCESS_CPUTIME_ID => CLOCK_PROCESS_CPUTIME_ID,
+        __WASI_CLOCK_REALTIME => CLOCK_REALTIME,
+        __WASI_CLOCK_THREAD_CPUTIME_ID => CLOCK_THREAD_CPUTIME_ID,
+        _ => return __WASI_EINVAL,
+    };
+
+    let (output, timespec_out) = unsafe {
+        let mut timespec_out: timespec = mem::uninitialized();
+        (
+            clock_gettime(unix_clock_id, &mut timespec_out),
+            timespec_out,
+        )
+    };
+
+    // TODO: adjust output by precision...
+
+    time.set(timespec_out.tv_nsec as __wasi_timestamp_t);
+
+    // TODO: map output of clock_gettime to __wasi_errno_t
+    __WASI_ESUCCESS
+}

lib/wasi/src/syscalls/windows.rs

@@ -0,0 +1,17 @@
+use crate::syscalls::types::*;
+use std::cell::Cell;
+
+pub fn platform_clock_res_get(
+    clock_id: __wasi_clockid_t,
+    resolution: &Cell<__wasi_timestamp_t>,
+) -> __wasi_errno_t {
+    __WASI_EINVAL
+}
+
+pub fn platform_clock_time_get(
+    clock_id: __wasi_clockid_t,
+    precision: __wasi_timestamp_t,
+    time: &Cell<__wasi_timestamp_t>,
+) -> __wasi_errno_t {
+    unimplemented!()
+}