libposix: add access

qa/lib/c/access.c

@@ -0,0 +1,40 @@
+/*
+ * This file is part of Jehanne.
+ *
+ * Copyright (C) 2017 Giacomo Tesio <giacomo@tesio.it>
+ *
+ * Jehanne is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 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 General Public License
+ * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <u.h>
+#include <lib9.h>
+
+void
+main(void)
+{
+	char *err = nil;
+	if(access("/tmp", AEXIST) != 0)
+		err = "/tmp does not exists";
+	else if(access("/tmp", AREAD) != 0)
+		err = "/tmp is not readable";
+	else if(access("/tmp", AWRITE) != 0)
+		err = "/tmp is not writeable";
+	else if(access("/tmp", AEXEC) != 0)
+		err = "/tmp is not traversable";
+	if(err == nil){
+		print("PASS\n");
+		exits("PASS");
+	} else {
+		print("FAIL: %s\n", err);
+		exits("FAIL");
+	}
+}