f = fopen("bugtest", "w+");
f = fopen("/tmp/bugtest", "w+");
DEFUN(main, (argc, argv),      int argc AND char **argv){  FILE *f;  int i;  char buffer[31];  while ((i = getopt (argc, argv, "rw")) != EOF)    switch (i)      {      case 'r':	stdio_block_read = 0;	break;      case 'w':	stdio_block_write = 0;	break;      }  f = fopen("bugtest", "w+");  for (i=0; i<9000; i++) {    putc('x', f);  }  fseek(f, 8180L, 0);  fwrite("Where does this text come from?", 1, 31, f);  fseek(f, 8180L, 0);  fread(buffer, 1, 31, f);  fwrite(buffer, 1, 31, stdout);  fclose(f);  if (!memcmp (buffer, "Where does this text come from?", 31))    {      puts ("\nTest succeeded.");      return 0;    }  else    {      puts ("\nTest FAILED!");      return 1;    }}