--- /dev/null
+#include <syscall.h>
+#include "tests/lib.h"
+#include "tests/main.h"
+
+static char buf[76543];
+
+void
+test_main (void)
+{
+ const char *filename = "testfile";
+ char zero = 0;
+ int fd;
+
+ CHECK (create (filename, 0), "create \"%s\"", filename);
+ CHECK ((fd = open (filename)) > 1, "open \"%s\"", filename);
+ msg ("seek \"%s\"", filename);
+ seek (fd, sizeof buf - 1);
+ CHECK (write (fd, &zero, 1) > 0, "write \"%s\"", filename);
+ msg ("close \"%s\"", filename);
+ close (fd);
+ check_file (filename, buf, sizeof buf);
+}