Port time() and times()

Author: catamorphism

libc-bottom-half/clocks/times.c

@@ -21,7 +21,11 @@ clock_t times(struct tms *buffer) {
         .tms_cutime = 0
     };
 
+#ifdef __wasilibc_use_wasip2
+    monotonic_clock_instant_t realtime = monotonic_clock_now();
+#else
     __wasi_timestamp_t realtime = 0;
     (void)__wasi_clock_time_get(__WASI_CLOCKID_MONOTONIC, 0, &realtime);
+#endif
     return realtime;
 }

libc-bottom-half/cloudlibc/src/libc/time/time.c

@@ -8,8 +8,12 @@
 #include <time.h>
 
 time_t time(time_t *tloc) {
+#ifdef __wasilibc_use_wasip2
   __wasi_timestamp_t ts = 0;
   (void)__wasi_clock_time_get(__WASI_CLOCKID_REALTIME, NSEC_PER_SEC, &ts);
+#else
+  monotonic_clock_instant_t ts = monotonic_clock_now();
+#endif
   if (tloc != NULL)
     *tloc = ts / NSEC_PER_SEC;
   return ts / NSEC_PER_SEC;

test/src/misc/time_and_times.c

@@ -0,0 +1,28 @@
+//! add-flags.py(CFLAGS): -D_WASI_EMULATED_PROCESS_CLOCKS
+//! add-flags.py(LDFLAGS): -lwasi-emulated-process-clocks
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/times.h>
+#include "test.h"
+
+#define TEST(c, ...) ((c) ? 1 : (t_error(#c" failed: " __VA_ARGS__),0))
+
+int main(void)
+{
+	time_t t;
+        struct tms buffer;
+
+        clock_t result = times(&buffer);
+        TEST(result > 0);
+        TEST(buffer.tms_utime > 0);
+        TEST(buffer.tms_cutime == 0); // always 0 under WASI
+
+        time_t t1 = time(&t);
+        TEST(t==t1);
+        TEST(t > 0);
+
+	return t_status;
+}