IPv6 hackery

Split up ntp_lib.m4 into smaller, more specific subsets

Use {step,adj}_systime from libntp.

Use EX_* codes for exit status.libevent cleanuplibevent upgrade

Move blocking worker and intres from ntpd to libntp.Move AC_FUNC_FORK
and AC_FUNC_ALLOCA to ntp_libntp.m4 along with move of intres/blocking
worker to libntp.

Use %m instead of strerror().

make -lz depend on zlib.hhp-ux portability fixportability

Allow libevent's regress to be skipped in make check.

Switch sntp from evdns to blocking worker intres.

Quiet "signal_no_reset: signal 18 had flags 20000" on OpenSolaris,
adding SA_NOCLDSTOP to IGNORED_SA_FLAGS.

Be consistent about how blocking children go away:

1.  Parent requests them to go by closing pipe or CHILD_EXIT_REQ.

2.  Child goes away quietly.

3.  Parent sees them gone via broken resp pipe or CHILD_GONE_RESP.

4.  Parent clears blocking_children entry for reuse.

Make delay between queries to addresses resolved from same hostname
per-family in sntp, as ntpd won't consider our v4 and v6 source
addresses to be one remote rate-limit target.

use freeaddrinfo() in ntpq's getnetnum().valgrind warned of branch
dependent on uninitialized value, irig_decode()'s local syncdig.

Free OpenSSL dynamic allocations atexit.

Enable pthreads buildlibntp autoconf macro cleanupMove "can't write
KoD file" warning from sntp shutdown to startup.

Use libevent log callback to redirect messages from stderr to
msyslog()enable libevent debug mode if sntp debug > 0Issue a single
read event for each socket, rather than one per query.

Do not attempt to read in socket callback for EV_TIMEOUT.ipv6 fixes
for sntpCrib some pthread m4 from BIND for libisc.

Fix step/slew logic in sntp.sntp --headspace option (default 10ms)
spaces queries.

Provide less-broken gettimeofday_cached().

Add support for --(no-)wait and -uctimeoutRemove duplicate
clock_gettime/clock_settime logic from sntp/configure.ac, it's now in
sntp/m4/ntp_libntp.m4.

Bump config.cache version stamps to account for cache-incompatible
change to librt detection.

Omit unused code with recent gcc and gnu ld.

AC_LANG update for openldap autoconf macrosClean up AC_DEFINE and
AC_DEFINE_UNQUOTED arg quoting in openldap*.m4add a timeout for
test-eof.c as it may hang under HP-UX 10.20Use pthreads for blocking
worker rather than fork, if possible.

Quiet alignment warning due to casting sockaddr * to sockaddr_u *Quiet
ntp_control.c and ntp_request.c warnings about casting char * to
u_int32 * using unions.

Use void * rather than char * for variant pointers to help with
pointer cast increases required alignment warnings.

Fix many warnings enabled with -Wcast-align, when casting a pointer to
a more-strictly-aligned underlying type.preset
ol_with_yielding_select=${ol_with_yielding_select-auto}Also change
tests to use x prefix as insurance against other issues.

We always need the PTHREADS AM_CONDITIONAL.  Use the OL check.

Use NTP_LIBEVENT m4sh macro to decide between installed and tearoff  libevent.

Add readonly arg to kod_init_kod_db() for tests -- prevents editing
test baseline input KoD files during make check, regression limited to
sntp/libevent branch.

Switch libevent-2.0.10-stable from ACX_PTHREADS to OL_THREAD_CHECKUse
socketpair() instead of pipe() when available, as avoiding
EV_FEATURE_FDS allows libevent to use a faster backend on systems like
Linux without an O(1) backend that handles pipes.

Remove contentious libevent-cfg sentinel files, modify libevent's
confgure args via $ac_configure_args.

Strip unneeded checks from ntp_ipv6.m4: for struct sockaddr_storage
member ss_family for struct sockaddr_storage member ss_len for struct
sockaddr_storage member __ss_lenMove things used by libntp from
top-level configure.ac to NTP_LIBNTP and NTP_IPV6Change "forked worker
child (pid 0)" from msyslog() to DPRINTF().

Change initial socket boundary message from DEBUG-only msyslog() to DPRINTF().