1 files changed, 32 insertions, 0 deletions
diff --git a/sys-utils/pivot_root.c b/sys-utils/pivot_root.c
new file mode 100644
index 000000000..ba2dbbed0
--- /dev/null
+++ b/sys-utils/pivot_root.c
@@ -0,0 +1,32 @@
+/* pivot_root.c - Change the root file system */
+
+/* Written 2000 by Werner Almesberger */
+
+#include <stdio.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#define pivot_root(new_root,put_old) syscall(SYS_pivot_root,new_root,put_old)
+
+#if 0
+/*
+ * With kernelheaders 2.3.41 or later, and ancient libc, try the following.
+ */
+#include <errno.h>
+#include <linux/unistd.h>
+static
+_syscall2(int,pivot_root,const char *,new_root,const char *,put_old)
+#endif
+
+int main(int argc, const char **argv)
+{
+	if (argc != 3) {
+		fprintf(stderr, "usage: %s new_root put_old\n", argv[0]);
+		return 1;
+	}
+	if (pivot_root(argv[1],argv[2]) < 0) {
+		perror("pivot_root");
+		return 1;
+	}
+	return 0;
+}