#include <u.h>#include <libc.h>#include <bio.h>#include <auth.h> void	error(char*); /* * called by listen as rexexec rexexec net dir ... */voidmain(void){	char *err, user[NAMELEN], buf[8192];	int n; 	if(err = srvauth(user))		error(err);	if(err = newns(user, 0))		error(err);	n = read(0, buf, sizeof buf - 1);	if(n < 0)		error("can't read command");	buf[n] = '\0';	putenv("service", "rx");	execl("/bin/rc", "rc", "-lc", buf, 0);	error("can't exec rc");} voiderror(char *msg){	fprint(2, "rexexec: %s: %r\n", msg);	exits(msg);}