These macros check for particular C typedefs in `sys/types.h' and `stdlib.h' (if it exists).
GETGROUPS_T to be whichever of gid_t or int
is the base type of the array argument to getgroups.
mode_t is not defined, define mode_t to be int.
off_t is not defined, define off_t to be long.
pid_t is not defined, define pid_t to be int.
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 ()
{
...
}
size_t is not defined, define size_t to be
unsigned.
uid_t is not defined, define uid_t to be int and
gid_t to be int.
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