From 9181e1363f09f80ba822175886450b751e408f14 Mon Sep 17 00:00:00 2001
From: Ron Yorston <rmy@pobox.com>
Date: Mon, 6 Apr 2020 09:03:52 +0100
Subject: time: WIN32 port

Port the time applet to WIN32.  This requires the implemntation of
a replacement for wait3(2).

Only elapsed, user and system times are supported, not the memory
and i/o statistics reported by GNU time.
---
 win32/process.c      | 41 ++++++++++++++++++++++++++++++++++-------
 win32/sys/resource.h | 11 +++++++++++
 2 files changed, 45 insertions(+), 7 deletions(-)

(limited to 'win32')

diff --git a/win32/process.c b/win32/process.c
index 67ce3c100..28df33c23 100644
--- a/win32/process.c
+++ b/win32/process.c
@@ -3,21 +3,48 @@
 #include <psapi.h>
 #include "lazyload.h"
 
-int waitpid(pid_t pid, int *status, int options)
+pid_t waitpid(pid_t pid, int *status, int options)
+#if ENABLE_TIME
+{
+	return mingw_wait3(pid, status, options, NULL);
+}
+#endif
+
+#if ENABLE_TIME
+pid_t mingw_wait3(pid_t pid, int *status, int options, struct rusage *rusage)
+#endif
 {
 	HANDLE proc;
-	intptr_t ret;
+	DWORD code;
 
 	/* Windows does not understand parent-child */
 	if (pid > 0 && options == 0) {
 		if ( (proc=OpenProcess(SYNCHRONIZE|PROCESS_QUERY_INFORMATION,
 						FALSE, pid)) != NULL ) {
-			ret = _cwait(status, (intptr_t)proc, 0);
-			CloseHandle(proc);
-			if (ret == -1) {
-				return -1;
+			WaitForSingleObject(proc, INFINITE);
+			GetExitCodeProcess(proc, &code);
+#if ENABLE_TIME
+			if (rusage != NULL) {
+				FILETIME crTime, exTime, keTime, usTime;
+
+				memset(rusage, 0, sizeof(*rusage));
+				if (GetProcessTimes(proc, &crTime, &exTime, &keTime, &usTime)) {
+					uint64_t kernel_usec =
+						(((uint64_t)keTime.dwHighDateTime << 32)
+							| (uint64_t)keTime.dwLowDateTime)/10;
+					uint64_t user_usec =
+						(((uint64_t)usTime.dwHighDateTime << 32)
+							| (uint64_t)usTime.dwLowDateTime)/10;
+
+					rusage->ru_utime.tv_sec = user_usec / 1000000U;
+					rusage->ru_utime.tv_usec = user_usec % 1000000U;
+					rusage->ru_stime.tv_sec = kernel_usec / 1000000U;
+					rusage->ru_stime.tv_usec = kernel_usec % 1000000U;
+				}
 			}
-			*status <<= 8;
+#endif
+			CloseHandle(proc);
+			*status = code << 8;
 			return pid;
 		}
 	}
diff --git a/win32/sys/resource.h b/win32/sys/resource.h
index e69de29bb..3220d8112 100644
--- a/win32/sys/resource.h
+++ b/win32/sys/resource.h
@@ -0,0 +1,11 @@
+#ifndef _SYS_RESOURCE_H
+#define _SYS_RESOURCE_H 1
+
+#include <time.h>
+
+struct rusage {
+	struct timeval ru_utime;
+	struct timeval ru_stime;
+};
+
+#endif
-- 
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