Problem with screen

[Matthias Apitz]

El día Wednesday, May 09, 2018 a las 03:44:56PM +0200, Albert Shih escribió:

> Hi,
> 
> I've got a freebsd 11.1-RELEASE-p6 on bare-metal and I've got a very
> strange problem.
> 
> When I launch screen it's take very long time to create a screen.
> 
> So I try truss screen, in a typescript, and I got
> 
> close(11285153)                                  ERR#9 'Bad file descriptor'
> close(11285152)                                  ERR#9 'Bad file descriptor'
> ..............
> close(1)                                  ERR#9 'Bad file descriptor'
> 
> between those I got
> 
>   11285150 lines of
> 
> close(....)                                  ERR#9 'Bad file descriptor'
> 
> Everything are up2date on the server.
> 
> Anyone got a idea ?

I'd say a bug. It wants to close all possible
filedescriptors, regardless if they're open or not, from some (wrong
deduced) maximal value to 1. 

I checked out the port and modified the function closing the files in
misc.c:

void
closeallfiles(except)
int except;
{
  int f;
#ifdef SVR4
  struct rlimit rl;

  if ((getrlimit(RLIMIT_NOFILE, &rl) == 0) && rl.rlim_max != RLIM_INFINITY) {
    f = rl.rlim_max;
    printf("1: closeallfiles: %d\n", f);
  } else
#endif /* SVR4 */
#if defined(SYSV) && defined(NOFILE) && !defined(ISC)
  f = NOFILE;
  printf("2: closeallfiles: %d\n", f);
#else /* SYSV && !ISC */
  f = getdtablesize();
  printf("3: closeallfiles: %d\n", f);
#endif /* SYSV && !ISC */
  printf("closeallfiles: %d\n", f);
  exit(1);
  while (--f > 2)
    if (f != except)
      close(f);
}


it prints:

./screen
1: closeallfiles: 116973
3: closeallfiles: 116973
closeallfiles: 116973

So you see where the bug comes from ...

	matthias
-- 
Matthias Apitz, ✉ guru at unixarea.de, ⌂ http://www.unixarea.de/  📱 +49-176-38902045
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