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implement setting atime and mtime in fswstat for unix and windows

--- a/kern/devfs-posix.c

+++ b/kern/devfs-posix.c

@@ -1,5 +1,6 @@

 #include	"u.h"

 #include	<sys/types.h>

+#include	<sys/time.h>

 #include	<sys/stat.h>

 #include	<dirent.h>

 #include	<fcntl.h>

@@ -406,7 +407,14 @@

 		uif->mode &= ~0777;

 		uif->mode |= d.mode&0777;

 	}

-

+	if(~d.atime != 0 || ~d.mtime != 0){

+		struct timeval t[2];

+		t[0].tv_sec = ~d.atime != 0 ? d.atime : stbuf->st_atime;

+		t[0].tv_usec = 0;

+		t[1].tv_sec = ~d.mtime != 0 ? d.mtime : stbuf->st_mtime;

+		t[1].tv_usec = 0;

+		utimes(uif->path, t);

+	}

 	if(d.name[0] && strcmp(d.name, lastelem(uif->path)) != 0) {

 		char *base, *newpath;

--- a/kern/devfs-win32.c

+++ b/kern/devfs-win32.c

@@ -61,6 +61,17 @@

 	return ((t<0)?(-1 - (-t - 1)) : t)/10000000;

 }

+static FILETIME

+filetime(ulong ut)

+{

+	FILETIME ft;

+	vlong t = (vlong)ut * 10000000LL;

+	t += 116444736000000000LL;

+	ft.dwLowDateTime = t;

+	ft.dwHighDateTime = t >> 32;

+	return ft;

+}

+

 static uvlong

 pathhash(wchar_t *p)

 {

@@ -578,6 +589,29 @@

 	uif = c->aux;

 	if(pathtype(uif->path) != TPATH_FILE)

 		error(Ebadstat);

+	if(~d.atime != 0 || ~d.mtime != 0){

+		FILETIME ta, *pta = NULL;

+		FILETIME tm, *ptm = NULL;

+		HANDLE h;

+		if(~d.atime != 0){

+			ta = filetime(d.atime);

+			pta = &ta;

+		}

+		if(~d.mtime != 0){

+			tm = filetime(d.mtime);

+			ptm = &tm;

+		}

+		if((h = CreateFile(uif->path,

+			FILE_WRITE_ATTRIBUTES,

+			FILE_SHARE_READ | FILE_SHARE_WRITE,

+			NULL,

+			OPEN_EXISTING,

+			FILE_ATTRIBUTE_NORMAL,

+			0)) != INVALID_HANDLE_VALUE){

+			SetFileTime(h, NULL, pta, ptm);

+			CloseHandle(h);

+		}

+	}

 	/* change name */

 	if(d.name[0]){

 		wchar_t *base, *newpath;