fs: Add stat example

Signed-off-by: Louis Solofrizzo <lsolofrizzo@online.net>

unikernel-demo/fs1/stat/Makefile

@@ -0,0 +1,3 @@
+export ukl-obj-m := main.o
+
+include ../../Makefile

unikernel-demo/fs1/stat/main.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <sys/stat.h>
+
+#ifndef USERSPACE
+#define main ukl_main
+#endif
+
+int main(void)
+{
+    struct stat st = { 0 };
+
+    if (stat("/etc/passwd", &st) != 0)
+    {
+        fprintf(stderr, "Cannot stat() /etc/passwd\n");
+        return 1;
+    }
+
+    printf("Size of /etc/passwd: %zu bytes\n", st.st_size);
+    return 0;
+}