text: #include "substdio.h"
  #include "subfd.h"
  #include "fmt.h"
  #include "select.h"
  #include "exit.h"
  #include "auto_spawn.h"
  
  char num[FMT_ULONG];
  fd_set fds;
  
  void main()
  {
    unsigned long hiddenlimit;
    unsigned long maxnumd;
   
    hiddenlimit = sizeof(fds) * 8;
    maxnumd = (hiddenlimit - 5) / 2;
   
    if (auto_spawn < 1) {
      substdio_puts(subfderr,"Oops. You have set conf-spawn lower than 1.\n");
      substdio_flush(subfderr);
      _exit(1);
    }
  
    if (auto_spawn > 255) {
      substdio_puts(subfderr,"Oops. You have set conf-spawn higher than 255.\n");
      substdio_flush(subfderr);
      _exit(1);
    }
  
    if (auto_spawn > maxnumd) {
      substdio_puts(subfderr,"Oops. Your system's FD_SET() has a hidden limit of ");
      substdio_put(subfderr,num,fmt_ulong(num,hiddenlimit));
      substdio_puts(subfderr," descriptors.\n\
  This means that the qmail daemons could crash if you set the run-time\n\
  concurrency higher than ");
      substdio_put(subfderr,num,fmt_ulong(num,maxnumd));
      substdio_puts(subfderr,". So I'm going to insist that the concurrency\n\
  limit in conf-spawn be at most ");
      substdio_put(subfderr,num,fmt_ulong(num,maxnumd));
      substdio_puts(subfderr,". Right now it's ");
      substdio_put(subfderr,num,fmt_ulong(num,(unsigned long) auto_spawn));
      substdio_puts(subfderr,".\n");
      substdio_flush(subfderr);
      _exit(1);
    }
    _exit(0);
  }
  