win: fix THREAD_CPUTIME clock_time_get (#181)

clock_time_get on Windows would return Bad file descriptor
when asking for the thread time on Windows, i.e.
uvwasi_clock_time_get() for
UVWASI_CLOCK_THREAD_CPUTIME_ID.

Thread times need to use GetThreadTimes() instead of
GetProcessTimes().

Author: ospencer

src/clocks.c

@@ -11,15 +11,15 @@
 #include "uv_mapping.h"
 
 
-#define UVWASI__WIN_TIME_AND_RETURN(handle, time)                             \
+#define UVWASI__WIN_TIME_AND_RETURN(handle, get_times, time)                  \
   do {                                                                        \
     FILETIME create;                                                          \
     FILETIME exit;                                                            \
     FILETIME system;                                                          \
     FILETIME user;                                                            \
     SYSTEMTIME sys_system;                                                    \
     SYSTEMTIME sys_user;                                                      \
-    if (0 == GetProcessTimes((handle), &create, &exit, &system, &user)) {     \
+    if (0 == get_times((handle), &create, &exit, &system, &user)) {           \
       return uvwasi__translate_uv_error(                                      \
         uv_translate_sys_error(GetLastError())                                \
       );                                                                      \
@@ -137,7 +137,7 @@ uvwasi_errno_t uvwasi__clock_gettime_realtime(uvwasi_timestamp_t* time) {
 
 uvwasi_errno_t uvwasi__clock_gettime_process_cputime(uvwasi_timestamp_t* time) {
 #if defined(_WIN32)
-  UVWASI__WIN_TIME_AND_RETURN(GetCurrentProcess(), *time);
+  UVWASI__WIN_TIME_AND_RETURN(GetCurrentProcess(), GetProcessTimes, *time);
 #elif defined(CLOCK_PROCESS_CPUTIME_ID) && \
       !defined(__APPLE__)               && \
       !defined(__sun)
@@ -150,7 +150,7 @@ uvwasi_errno_t uvwasi__clock_gettime_process_cputime(uvwasi_timestamp_t* time) {
 
 uvwasi_errno_t uvwasi__clock_gettime_thread_cputime(uvwasi_timestamp_t* time) {
 #if defined(_WIN32)
-  UVWASI__WIN_TIME_AND_RETURN(GetCurrentThread(), *time);
+  UVWASI__WIN_TIME_AND_RETURN(GetCurrentThread(), GetThreadTimes, *time);
 #elif defined(__APPLE__)
   UVWASI__OSX_THREADTIME_AND_RETURN(*time);
 #elif defined(CLOCK_THREAD_CPUTIME_ID) && !defined(__sun) && !defined(__PASE__)

test/test-clock-time-get.c

@@ -0,0 +1,37 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include "uvwasi.h"
+
+int main(void) {
+  uvwasi_t uvwasi;
+  uvwasi_options_t init_options;
+  uvwasi_errno_t err;
+  uvwasi_timestamp_t time;
+  uvwasi_timestamp_t precision = 1000;
+
+  uvwasi_options_init(&init_options);
+
+  err = uvwasi_init(&uvwasi, &init_options);
+  assert(err == 0);
+
+  err = uvwasi_clock_time_get(&uvwasi, UVWASI_CLOCK_REALTIME, precision, &time);
+  assert(err == 0);
+  assert(time > 0);
+
+  err = uvwasi_clock_time_get(&uvwasi, UVWASI_CLOCK_MONOTONIC, precision, &time);
+  assert(err == 0);
+  assert(time > 0);
+
+  err = uvwasi_clock_time_get(&uvwasi, UVWASI_CLOCK_PROCESS_CPUTIME_ID, precision, &time);
+  assert(err == 0);
+  assert(time > 0);
+
+  err = uvwasi_clock_time_get(&uvwasi, UVWASI_CLOCK_THREAD_CPUTIME_ID, precision, &time);
+  assert(err == 0);
+  assert(time > 0);
+
+  uvwasi_destroy(&uvwasi);
+
+  return 0;
+}