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/* 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;
}
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