RFC: [PATCH] Enable olddelta to be NULL in adjtime(3)

[Svante Signell]

Hello,

Attached are two small patches to enable the third argument of adjtime() to be
NULL, see adjtime(3). Calling __host_adjust_time() with a third argument being
NULL, causes a segfault due to the *old_adjustment = OutP->old_adjustment
statement in RPC_host_adjust_time.c.

The glibc patch sysdeps_mach_hurd_adjtime.c.diff use a dummy struct timeval to
avoid calling ___host_adjust_time() in _adjtime() with a NULL third argument.
Smarter solutions can probably be found, comments are welcome.

The gnumach patch, 80_mach_clock.patch sets the old_adjustment to oadj only if
old_adjustment is non-null. This patch is probably redundant but included here
anyway.

TODO: EINVAL should also be returned if the supplied delta is too large, as
described in adjtime(3). This would be easy to fix, by a slight modification of
adjtime.c and/or mach_clock.c.

Thanks!

80_mach_clock.patch
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sysdeps_mach_hurd_adjtime.c.diff
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