etc/ulimit.hack

   1 #!/bin/sh
   2 #
   3 # ulimit.hack: Create an intermediate program for use in
   4 # between kernel initialization and init startup.
   5 # This is needed on a 3b system if the standard CDLIMIT is
   6 # so small that the dumped Emacs file cannot be written.
   7 # This program causes everyone to get a bigger CDLIMIT value
   8 # so that the dumped Emacs can be written out.
   9 #
  10 # Users of V.3.1 and later should not use this; see etc/MACHINES
  11 # and reconfig your kernel's CDLIMIT parameter instead.
  12 #
  13 # Caveat: Heaven help you if you screw this up.  This puts
  14 # a new program in as /etc/init, which then execs the real init.
  15 #
  16 cat > ulimit.init.c << \EOF
  17 main(argc, argv)
  18 int argc;
  19 char *argv[];
  20 {
  21         ulimit(2, 262144L);     /* "2" is the "set" command. */
  22         /* 262,144 allows for 128Mb files to be written. */
  23         /* If that value isn't suitable, roll your own.  */
  24         execv("/etc/real.init", argv);
  25 }
  26 EOF
  27 #
  28 # Compile it and put it in place of the usual init program.
  29 #
  30 cc ulimit.init.c -o ulimit.init
  31 mv /etc/init /etc/real.init
  32 mv ulimit.init /etc/ulimit.init
  33 ln /etc/ulimit.init /etc/init
  34 mv ulimit.init.c /etc/ulimit.init.c     # to keep src for this hack nearby.
  35 chmod 0754 /etc/init
  36 exit 0
  37 #
  38 # Upon system reboot, all processes will inherit the new large ulimit.