qa: newlib test for chdir and mkdir

qa/lib/newlib/103-files.c

@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+int
+main(int argc, char **argv)
+{
+	int ret;
+	char buf[256];
+
+	ret = chdir("/tmp");
+	if(ret != 0){
+		printf("FAIL: chdir(/tmp) returns %d\n", ret);
+		exit(1);
+	}
+
+	ret = chdir("/inexistent_folder");
+	if(ret != -1 || errno != ENOENT){
+		printf("FAIL: chdir(/inexistent_folder) returns %d; errno %d\n", ret, errno);
+		exit(2);
+	}
+
+	if(getcwd(buf, sizeof(buf)) == NULL){
+		perror("FAIL: getcwd failed");
+		exit(3);
+	}
+	if(strcmp("/tmp", buf) != 0){
+		printf("FAIL: getcwd() returns %s instead of /tmp\n", buf);
+		exit(4);
+	}
+
+	ret = mkdir("qa-files", S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
+	if(ret != 0){
+		printf("FAIL: mkdir(qa-files) in /tmp returns %d\n", ret);
+		exit(5);
+	}
+
+	return 0;
+}

qa/lib/newlib/199-files-CLEAR.runner

@@ -0,0 +1,3 @@
+#!/cmd/rc
+
+rm -fr /tmp/qa-files

qa/lib/newlib/build.json

@@ -38,6 +38,7 @@
 			"100-files.c",
 			"101-files.c",
 			"102-files.c",
+			"103-files.c",
 			"200-signals.c",
 			"201-signals.c",
 			"202-signals.c",
@@ -86,6 +87,7 @@
 			"100-files.c",
 			"101-files.c",
 			"102-files.c",
+			"103-files.c",
 			"200-signals.c",
 			"201-signals.c",
 			"202-signals.c",