1 /* vi: set sw=4 ts=4: */
3 * pivot_root.c - Change root file system. Based on util-linux 2.10s
5 * busyboxed by Evin Robertson
6 * pivot_root syscall stubbed by Erik Andersen, so it will compile
7 * regardless of the kernel being used.
12 #include <sys/syscall.h>
13 #include <linux/unistd.h>
16 #ifndef __NR_pivot_root
17 #warning This kernel does not support the pivot_root syscall
18 #warning The pivot_root system call is being stubbed out...
19 int pivot_root(const char * new_root,const char * put_old)
21 /* BusyBox was compiled against a kernel that did not support
22 * the pivot_root system call. To make this application work,
23 * you will need to recompile with a kernel supporting the
24 * pivot_root system call.
26 fprintf(stderr, "\n\nTo make this application work, you will need to recompile\n");
27 fprintf(stderr, "with a kernel supporting the pivot_root system call. -Erik\n\n");
32 static _syscall2(int,pivot_root,const char *,new_root,const char *,put_old)
37 int pivot_root_main(int argc, char **argv)
42 if (pivot_root(argv[1],argv[2]) < 0)
43 perror_msg_and_die("pivot_root");