long
sysunmount(ulong *arg)
{
Chan *cmount, *cmounted;
cmounted = 0;
validaddr(arg[1], 1, 0);
cmount = namec((char *)arg[1], Amount, 0, 0);
if(waserror()) {
cclose(cmount);
if(cmounted)
cclose(cmounted);
nexterror();
}
if(arg[0]) {
/*
* This has to be namec(..., Aopen, ...) because
* if arg[0] is something like /srv/cs or /fd/0,
* opening it is the only way to get at the real
* Chan underneath.
*/
validaddr(arg[0], 1, 0);
cmounted = namec((char*)arg[0], Aopen, OREAD, 0);
}
cunmount(cmount, cmounted);
poperror();
cclose(cmount);
if(cmounted)
cclose(cmounted);
return 0;
}
void
sysunmount(Ar0* ar0, ...)
{
Proc *up = externup();
char *name, *old;
Chan *cmount, *cmounted;
va_list list;
va_start(list, ar0);
/*
* int unmount(char* name, char* old);
*/
name = va_arg(list, char*);
old = va_arg(list, char*);
cmount = namec(validaddr(old, 1, 0), Amount, 0, 0);
va_end(list);
cmounted = nil;
if(name != nil) {
if(waserror()) {
cclose(cmount);
nexterror();
}
/*
* This has to be namec(..., Aopen, ...) because
* if arg[0] is something like /srv/cs or /fd/0,
* opening it is the only way to get at the real
* Chan underneath.
*/
cmounted = namec(validaddr(name, 1, 0), Aopen, OREAD, 0);
poperror();
}
if(waserror()) {
cclose(cmount);
if(cmounted != nil)
cclose(cmounted);
nexterror();
}
cunmount(cmount, cmounted);
cclose(cmount);
if(cmounted != nil)
cclose(cmounted);
poperror();
ar0->i = 0;
}
