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(autocf21.info.gz) Particular Typedefs

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 4.6.1 Particular Typedef Checks
 -------------------------------
 
 These macros check for particular C typedefs in `sys/types.h' and
 `stdlib.h' (if it exists).
 
  -- Macro: AC_TYPE_GETGROUPS
      Define `GETGROUPS_T' to be whichever of `gid_t' or `int' is the
      base type of the array argument to `getgroups'.
 
  -- Macro: AC_TYPE_MODE_T
      If `mode_t' is not defined, define `mode_t' to be `int'.
 
  -- Macro: AC_TYPE_OFF_T
      If `off_t' is not defined, define `off_t' to be `long'.
 
  -- Macro: AC_TYPE_PID_T
      If `pid_t' is not defined, define `pid_t' to be `int'.
 
  -- Macro: AC_TYPE_SIGNAL
      If `signal.h' declares `signal' as returning a pointer to a
      function returning `void', define `RETSIGTYPE' to be `void';
      otherwise, define it to be `int'.
 
      Define signal handlers as returning type `RETSIGTYPE':
 
           RETSIGTYPE
           hup_handler ()
           {
           ...
           }
 
  -- Macro: AC_TYPE_SIZE_T
      If `size_t' is not defined, define `size_t' to be `unsigned'.
 
  -- Macro: AC_TYPE_UID_T
      If `uid_t' is not defined, define `uid_t' to be `int' and `gid_t'
      to be `int'.
 
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