/* © 2008 sqweek <sqweek@gmail.com> * See COPYING for details. */#include <err.h>#include <stdlib.h>#include <stdio.h>#include <unistd.h> #include <sys/stat.h>#include <sys/mount.h>#include <sys/wait.h> intmain(int argc, char **argv){	char *old = NULL, *new = NULL;	struct stat stbuf;	int pid, status; 	while (*++argv) {		if (!old) {			old = *argv;		} else if (!new) {			new = *argv;		} else {			errx(1, "%s: too many arguments", *argv);		}	} 	if (!old || !new) {		errx(1, "usage: 9bind old new");	} 	/* Make sure mount exists, is writable, and not sticky */	if (stat(new, &stbuf) || access(new, W_OK)) {		err(1, "%s", new);	}	if (stbuf.st_mode & S_ISVTX) {		errx(1, "%s: refusing to bind over sticky directory", new);	} 	switch(pid=fork()) {		case -1:			err(1, "fork");		case 0:			setuid(0);			execl("/bin/mount", "mount", "--bind", old, new, (char*)NULL);			err(1, "execl");		default:			wait(&status);	} 	return WEXITSTATUS(status);}