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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