libposix: implement gettimeofday

sys/src/lib/posix/timers.c

@@ -0,0 +1,76 @@
+/*
+ * This file is part of Jehanne.
+ *
+ * Copyright (C) 2017 Giacomo Tesio <giacomo@tesio.it>
+ *
+ * This is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3 of the License.
+ *
+ * Jehanne is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <u.h>
+#include <lib9.h>
+#include <posix.h>
+#include "internal.h"
+
+static PosixTimevalReader __libposix_timeval_reader;
+static PosixTimezoneReader __libposix_timezone_reader;
+
+int
+POSIX_gettimeofday(int *errnop, void *timeval, void *timezone)
+{
+	Tm *t;
+	PosixError e = 0;
+
+	if(timeval == nil && timezone == nil){
+		e = PosixEFAULT;
+		goto FailWithError;
+	}
+
+	t = localtime(time(nil));
+
+	if(timeval != nil){
+		e = __libposix_timeval_reader(timeval, t);
+		if(e != 0)
+			goto FailWithError;
+	}
+	if(timezone != nil){
+		e = __libposix_timezone_reader(timezone, t);
+		if(e != 0)
+			goto FailWithError;
+	}
+	return 0;
+
+FailWithError:
+	*errnop = __libposix_get_errno(e);
+	return -1;
+}
+
+int
+libposix_set_timeval_reader(PosixTimevalReader reader)
+{
+	if(__libposix_initialized())
+		return 0;
+	if(reader == nil)
+		return 0;
+	__libposix_timeval_reader = reader;
+	return 1;
+}
+
+int
+libposix_set_timezone_reader(PosixTimezoneReader reader)
+{
+	if(__libposix_initialized())
+		return 0;
+	if(reader == nil)
+		return 0;
+	__libposix_timezone_reader = reader;
+	return 1;
+}