mdw@git.distorted.org.uk Git - qmail/blob - chkspawn.c

   1 #include "substdio.h"
   2 #include "subfd.h"
   3 #include "fmt.h"
   4 #include "select.h"
   5 #include "exit.h"
   6 #include "auto_spawn.h"
   7
   8 char num[FMT_ULONG];
   9 fd_set fds;
  10
  11 void main()
  12 {
  13   unsigned long hiddenlimit;
  14   unsigned long maxnumd;
  15
  16   hiddenlimit = sizeof(fds) * 8;
  17   maxnumd = (hiddenlimit - 5) / 2;
  18
  19   if (auto_spawn < 1) {
  20     substdio_puts(subfderr,"Oops. You have set conf-spawn lower than 1.\n");
  21     substdio_flush(subfderr);
  22     _exit(1);
  23   }
  24
  25   if (auto_spawn > 255) {
  26     substdio_puts(subfderr,"Oops. You have set conf-spawn higher than 255.\n");
  27     substdio_flush(subfderr);
  28     _exit(1);
  29   }
  30
  31   if (auto_spawn > maxnumd) {
  32     substdio_puts(subfderr,"Oops. Your system's FD_SET() has a hidden limit of ");
  33     substdio_put(subfderr,num,fmt_ulong(num,hiddenlimit));
  34     substdio_puts(subfderr," descriptors.\n\
  35 This means that the qmail daemons could crash if you set the run-time\n\
  36 concurrency higher than ");
  37     substdio_put(subfderr,num,fmt_ulong(num,maxnumd));
  38     substdio_puts(subfderr,". So I'm going to insist that the concurrency\n\
  39 limit in conf-spawn be at most ");
  40     substdio_put(subfderr,num,fmt_ulong(num,maxnumd));
  41     substdio_puts(subfderr,". Right now it's ");
  42     substdio_put(subfderr,num,fmt_ulong(num,(unsigned long) auto_spawn));
  43     substdio_puts(subfderr,".\n");
  44     substdio_flush(subfderr);
  45     _exit(1);
  46   }
  47   _exit(0);
  48 }