Resolve failure to touch files when non-owner on *nix

ftouch(), semfile_signal(), and JS file_utime() would fail to update a file's access/mod times with errno=EPERM if not run as the file's owner. From "man utime":

EPERM times is not NULL, the caller's effective UID does not match the owner of the file, and the caller is not privileged (Linux: does not have the CAP_FOWNER capability).

So use a NULL times parameter value when updating to a file's time stamp(s) to the current time.

src/sbbs3/js_global.c

@@ -3406,6 +3406,7 @@ js_utime(JSContext *cx, uintN argc, jsval *arglist)
 	int32			actime;
 	int32			modtime;
 	struct utimbuf	ut;
+	struct utimbuf*	tp = NULL;
 	jsrefcount		rc;
 	BOOL			ret;
 
@@ -3421,11 +3422,8 @@ js_utime(JSContext *cx, uintN argc, jsval *arglist)
 	if(fname==NULL)
 		return(JS_TRUE);
 
-	/* use current time as default */
-	ut.actime = ut.modtime = time(NULL);
-
 	if(argc>1) {
-		actime=modtime=(int32_t)ut.actime;
+		actime=modtime=time32(NULL);
 		if(!JS_ValueToInt32(cx,argv[1],&actime)) {
 			free(fname);
 			return JS_FALSE;
@@ -3438,10 +3436,11 @@ js_utime(JSContext *cx, uintN argc, jsval *arglist)
 		}
 		ut.actime=actime;
 		ut.modtime=modtime;
+		tp = &ut;
 	}
 
 	rc=JS_SUSPENDREQUEST(cx);
-	ret=utime(fname,&ut)==0;
+	ret=utime(fname, tp)==0;
 	free(fname);
 	JS_RESUMEREQUEST(cx, rc);
 	JS_SET_RVAL(cx, arglist, BOOLEAN_TO_JSVAL(ret));

src/sbbs3/nopen.c

@@ -98,11 +98,9 @@ FILE* fnopen(int* fd, const char* str, int access)
 BOOL ftouch(const char* fname)
 {
 	int file;
-	struct utimbuf ut;
 
 	/* update the time stamp */
-	ut.actime = ut.modtime = time(NULL);
-	if(utime(fname, &ut)==0)
+	if(utime(fname, NULL)==0)
 		return TRUE;
 
 	/* create the file */

src/xpdev/semfile.c

@@ -127,7 +127,6 @@ void semfile_list_free(str_list_t* filelist)
 BOOL semfile_signal(const char* fname, const char* text)
 {
 	int file;
-	struct utimbuf ut;
 	size_t textlen = 0;
 	ssize_t wrlen = 0;
 #if !defined(NO_SOCKET_SUPPORT)
@@ -143,6 +142,5 @@ BOOL semfile_signal(const char* fname, const char* text)
 	close(file);
 
 	/* update the time stamp */
-	ut.actime = ut.modtime = time(NULL);
-	return utime(fname, &ut)==0 && wrlen == (ssize_t)textlen;
+	return utime(fname, NULL)==0 && wrlen == (ssize_t)textlen;
 }