#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);}