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This diff exposes parts of clock_gettime(2) and gettimeofday(2) to
userland via libc eliberating processes from the need for a context
switch everytime they want to count the passage of time.
If a timecounter clock can be exposed to userland than it needs to set
its tc_user member to a non-zero value. Tested with one or multiple
counters per architecture.
The timing data is shared through a pointer found in the new ELF
auxiliary vector AUX_openbsd_timekeep containing timehands information
that is frequently updated by the kernel.
Timing differences between the last kernel update and the current time
are adjusted in userland by the tc_get_timecount() function inside the
MD usertc.c file.
This permits a much more responsive environment, quite visible in
browsers, office programs and gaming (apparently one is are able to fly
in Minecraft now).
Tested by robert@, sthen@, naddy@, kmos@, phessler@, and many others!
OK from at least kettenis@, cheloha@, naddy@, sthen@
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value < 0. errno is only updated in this case. Change all (most?)
callers of syscalls to follow this better, and let's see if this strictness
helps us in the future.
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Add prototypes to localtime.c for offtime(), time2posix(), posix2time() to
reduce noise with -Wmissing-prototypes
Eliminate unnecessary #includes
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Kill old files that are no longer compiled.
okay theo
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ok deraadt@, vincent@
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rescinded 22 July 1999. Proofed by myself and Theo.
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Make sure everything uses {SYS,}LIBC_SCCS properly
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pirofti
deraadt
mmcc
guenther
espie
jfb
millert
tholo