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These are the rules so that older bsd systems and the POSIX standard
system can coexist togather.
1) If you use select then include "ntp_select.h"
select is not standard, since it is very system depenedent as to where
select is defined. The logic to include the right system dependent
include file is in "ntp_select.h".
2) Always use POSIX defintion of strings. Inlcude "ntp_string.h" instaed
of <string.h>.
3) Always include "ntp_malloc.h" if you use malloc.
4) Always include "ntp_io.h" instead of <sys/file.h> or <fnctl.h> to
get O_* flags.
5) Always include "ntp_if.h" instead of <net/if.h>.
6) Always include "ntp_stdlib.h" instead of <stdlib.h>.
7) Always define a system identifier for any new system added to the
machines directory. The identifier should always start with SYS_!
8) Define any special defines needed for a system in
./include/ntp_machine.h based on system identifier. This file is
included by the "ntp_types.h" file and should always be placed
first after the <> defines.
9) Define any special library prototypes left over from the system
library and include files in the "l_stdlib.h" file. This file is
included by the "ntp_stdlib.h" file and should ordinarily be
placed last in the includes list.
10) Don't define a include file by the same name as a system include file.
"l_stdlib.h" can contain any extra definitions that are needed so that
gcc will shut up. They should be controlled by a system identifier and
there should be a seperate section for each system. Really this will
make it easier to maintain.
See include/ntp_machines.h for the verious compile time options.
Good luck.
Bill Jones, with amendments by Dave Mills
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