RE: [Patch] Fix libstdc++/9533

[Pétur Runólfsson <peturr02 at ru dot is>]

Hi

Here is a much better test case for 9533 that uses a fifo instead
of /dev/tty, so it can be run automatically.

Petur

#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fstream>

#undef NDEBUG
#include <cassert>

int main()
{
  using namespace std;

  const int count = 10000;

  signal(SIGPIPE, SIG_IGN);
  unlink("xxx");
  
  if (0 != mkfifo("xxx", S_IRWXU))
    {
      assert(false);
    }
  
  int fval = fork();
  if (fval == -1)
    {
      unlink("xxx");
      assert(false);
    }
  else if (fval == 0)
    {
      filebuf ofbuf;
      ofbuf.open("xxx", ios_base::out);
      assert(ofbuf.is_open());
      sleep(1);

      for (int i = 0; i < count; ++i)
	ofbuf.sputc(i % 100);

      ofbuf.pubsync();
      sleep(1);
      ofbuf.close();
      exit(0);
    }

  filebuf ifbuf;
  ifbuf.open("xxx", ios_base::in);
  assert(ifbuf.is_open());

  for (int j = 0; j < count; ++j)
    {
      int c1 = ifbuf.sbumpc();
      printf("%d %d\n", j, c1);
      assert(c1 == j % 100);
    }

  int c6 = ifbuf.sbumpc();
  assert(c6 == filebuf::traits_type::eof());

  sleep(2);
  ifbuf.close();

  unlink("xxx");
  return 0;
}