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(autoconf.info)Particular Typedefs

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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'.