> Date: Sat, 16 May 2020 02:40:02 +0300
> From: Paul Irofti <p...@irofti.net>
>
> Here is an updated diff that addresses the following points mentioned by
> kettenis@:
>
> - syscall fallback was implemented from the first version
>
> - the low resolution clock argument, I think, was shown not to be a
> problem
There will be code for which this will be an unacceptable regression.
Things like benchmarking tools and things that care about video/audio
synchronization.
> - TSC and HPET alternatives were discussed, and if we decide to add
> them, I think that should be done by a separate diff
>
> - I think this version does proper wrapping (at least according to the
> README); of course Philip's input would be greatly appreciated!
Looks reasonable. You could consider not wrapping the
CLOCK_THREAD_CPUTIME_ID calls as we won't be able to optimize those
with this approach. That would make them slightly faster.
> - I will export the ELF bits after the diff gets in commitable shape
It really needs TSC support for that. And you also need to find a
solution for proper synchronization between userland and the kernel.
Currently they can race eachother in the sense that userland can read
the time at the same time the kernel is updating it. A generation
mechanism like the timehands use may be appropriate. You can't use locks!
Also, I think we need a versioning mechanism for the shared page, such
that libc can verify that it understands the interface offered by the
kernel. Maybe a major/minor number at the start of the page. If the
version check fails we can fall back on the system call. That allows
updates without a flag day.
If you really don't want to implement the TSC approach now, we could
consider introducing CLOCK_MONOTONIC_COARSE and CLOCK_REALTIME_COARSE
and use your implementation just for those two.
> - proper auxv number instead of 2004: I see that NetBSD
> has taken 2004 for AT_SUN_LDELF; should I take 2015 which seems the
> next one free?
The AT_SUN_XXX defines came from Solaris. They don't matter to us, so
I'd start the OpenBSD-specific values at 2000.
> Hopefully this version also fixes the init bug solene@ was seeing.
_dl_iterate_phdr() should not call find_timekeep().
>
> Paul
>
> diff --git lib/libc/asr/asr.c lib/libc/asr/asr.c
> index cd056c85719..2b25d49f32a 100644
> --- lib/libc/asr/asr.c
> +++ lib/libc/asr/asr.c
> @@ -196,11 +196,11 @@ poll_intrsafe(struct pollfd *fds, nfds_t nfds, int
> timeout)
> struct timespec pollstart, pollend, elapsed;
> int r;
>
> - if (clock_gettime(CLOCK_MONOTONIC, &pollstart))
> + if (WRAP(clock_gettime)(CLOCK_MONOTONIC, &pollstart))
> return -1;
>
> while ((r = poll(fds, 1, timeout)) == -1 && errno == EINTR) {
> - if (clock_gettime(CLOCK_MONOTONIC, &pollend))
> + if (WRAP(clock_gettime)(CLOCK_MONOTONIC, &pollend))
> return -1;
> timespecsub(&pollend, &pollstart, &elapsed);
> timeout -= elapsed.tv_sec * 1000 + elapsed.tv_nsec / 1000000;
> @@ -418,7 +418,7 @@ asr_check_reload(struct asr *asr)
> asr->a_rtime = 0;
> }
>
> - if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1)
> + if (WRAP(clock_gettime)(CLOCK_MONOTONIC, &ts) == -1)
> return;
>
> if ((ts.tv_sec - asr->a_rtime) < RELOAD_DELAY && asr->a_rtime != 0)
> diff --git lib/libc/crypt/bcrypt.c lib/libc/crypt/bcrypt.c
> index 82de8fa33b7..63edde9072e 100644
> --- lib/libc/crypt/bcrypt.c
> +++ lib/libc/crypt/bcrypt.c
> @@ -31,6 +31,7 @@
> *
> */
>
> +#include <sys/time.h>
> #include <sys/types.h>
> #include <blf.h>
> #include <ctype.h>
> @@ -248,9 +249,9 @@ _bcrypt_autorounds(void)
> char buf[_PASSWORD_LEN];
> int duration;
>
> - clock_gettime(CLOCK_THREAD_CPUTIME_ID, &before);
> + WRAP(clock_gettime)(CLOCK_THREAD_CPUTIME_ID, &before);
> bcrypt_newhash("testpassword", r, buf, sizeof(buf));
> - clock_gettime(CLOCK_THREAD_CPUTIME_ID, &after);
> + WRAP(clock_gettime)(CLOCK_THREAD_CPUTIME_ID, &after);
>
> duration = after.tv_sec - before.tv_sec;
> duration *= 1000000;
> diff --git lib/libc/dlfcn/dlfcn_stubs.c lib/libc/dlfcn/dlfcn_stubs.c
> index 78d728f66cb..7b75ec4582a 100644
> --- lib/libc/dlfcn/dlfcn_stubs.c
> +++ lib/libc/dlfcn/dlfcn_stubs.c
> @@ -80,10 +80,14 @@ dlerror(void)
> return "Wrong dl symbols!\n";
> }
>
> +extern void *elf_aux_timekeep;
> +extern int find_timekeep(void);
> +
> int
> dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *),
> void *data)
> {
> + find_timekeep();
> if (_dl_cb != NULL && _dl_cb->dl_iterate_phdr != NULL)
> return _dl_cb->dl_iterate_phdr(callback, data);
> #ifndef PIC
> diff --git lib/libc/dlfcn/init.c lib/libc/dlfcn/init.c
> index 270f54aada5..0238bb50b0b 100644
> --- lib/libc/dlfcn/init.c
> +++ lib/libc/dlfcn/init.c
> @@ -69,6 +69,9 @@ extern Elf_Ehdr __executable_start[] __attribute__((weak));
> /* provide definitions for these */
> const dl_cb *_dl_cb __relro = NULL;
>
> +extern void *elf_aux_timekeep;
> +extern int find_timekeep(void);
> +
> void _libc_preinit(int, char **, char **, dl_cb_cb *) __dso_hidden;
> void
> _libc_preinit(int argc, char **argv, char **envp, dl_cb_cb *cb)
> @@ -126,6 +129,7 @@ _libc_preinit(int argc, char **argv, char **envp,
> dl_cb_cb *cb)
> if (cb == NULL)
> setup_static_tib(phdr, phnum);
> #endif /* !PIC */
> + find_timekeep();
> }
>
> /* ARM just had to be different... */
> diff --git lib/libc/gen/times.c lib/libc/gen/times.c
> index 02e4dd44b5c..36841810d1b 100644
> --- lib/libc/gen/times.c
> +++ lib/libc/gen/times.c
> @@ -52,7 +52,7 @@ times(struct tms *tp)
> return ((clock_t)-1);
> tp->tms_cutime = CONVTCK(ru.ru_utime);
> tp->tms_cstime = CONVTCK(ru.ru_stime);
> - if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1)
> + if (WRAP(clock_gettime)(CLOCK_MONOTONIC, &ts) == -1)
> return ((clock_t)-1);
> return (ts.tv_sec * CLK_TCK + ts.tv_nsec / (1000000000 / CLK_TCK));
> }
> diff --git lib/libc/gen/timespec_get.c lib/libc/gen/timespec_get.c
> index 520a5954025..b2bdcd15a4d 100644
> --- lib/libc/gen/timespec_get.c
> +++ lib/libc/gen/timespec_get.c
> @@ -30,6 +30,7 @@
> * POSSIBILITY OF SUCH DAMAGE.
> */
>
> +#include <sys/time.h>
> #include <time.h>
>
> int
> @@ -37,7 +38,7 @@ timespec_get(struct timespec *ts, int base)
> {
> switch (base) {
> case TIME_UTC:
> - if (clock_gettime(CLOCK_REALTIME, ts) == -1)
> + if (WRAP(clock_gettime)(CLOCK_REALTIME, ts) == -1)
> return 0;
> break;
> default:
> diff --git lib/libc/hidden/sys/time.h lib/libc/hidden/sys/time.h
> index ed112320fa2..7f59daa0107 100644
> --- lib/libc/hidden/sys/time.h
> +++ lib/libc/hidden/sys/time.h
> @@ -22,6 +22,7 @@
>
> PROTO_NORMAL(adjfreq);
> PROTO_NORMAL(adjtime);
> +PROTO_WRAP(clock_gettime);
> PROTO_NORMAL(futimes);
> PROTO_NORMAL(getitimer);
> PROTO_NORMAL(gettimeofday);
> diff --git lib/libc/net/res_random.c lib/libc/net/res_random.c
> index 763e420bb88..9babb28470a 100644
> --- lib/libc/net/res_random.c
> +++ lib/libc/net/res_random.c
> @@ -219,7 +219,7 @@ res_initid(void)
> if (ru_prf != NULL)
> arc4random_buf(ru_prf, sizeof(*ru_prf));
>
> - clock_gettime(CLOCK_MONOTONIC, &ts);
> + WRAP(clock_gettime)(CLOCK_MONOTONIC, &ts);
> ru_reseed = ts.tv_sec + RU_OUT;
> ru_msb = ru_msb == 0x8000 ? 0 : 0x8000;
> }
> @@ -232,7 +232,7 @@ __res_randomid(void)
> u_int r;
> static void *randomid_mutex;
>
> - clock_gettime(CLOCK_MONOTONIC, &ts);
> + WRAP(clock_gettime)(CLOCK_MONOTONIC, &ts);
> pid = getpid();
>
> _MUTEX_LOCK(&randomid_mutex);
> diff --git lib/libc/rpc/clnt_tcp.c lib/libc/rpc/clnt_tcp.c
> index 8e6ef515b0e..927b4bf2028 100644
> --- lib/libc/rpc/clnt_tcp.c
> +++ lib/libc/rpc/clnt_tcp.c
> @@ -393,12 +393,12 @@ readtcp(struct ct_data *ct, caddr_t buf, int len)
> pfd[0].events = POLLIN;
> TIMEVAL_TO_TIMESPEC(&ct->ct_wait, &wait);
> delta = wait;
> - clock_gettime(CLOCK_MONOTONIC, &start);
> + WRAP(clock_gettime)(CLOCK_MONOTONIC, &start);
> for (;;) {
> r = ppoll(pfd, 1, &delta, NULL);
> save_errno = errno;
>
> - clock_gettime(CLOCK_MONOTONIC, &after);
> + WRAP(clock_gettime)(CLOCK_MONOTONIC, &after);
> timespecsub(&start, &after, &duration);
> timespecsub(&wait, &duration, &delta);
> if (delta.tv_sec < 0 || !timespecisset(&delta))
> diff --git lib/libc/shlib_version lib/libc/shlib_version
> index 06f98b01084..5fb0770494f 100644
> --- lib/libc/shlib_version
> +++ lib/libc/shlib_version
> @@ -1,4 +1,4 @@
> major=96
> -minor=0
> +minor=1
> # note: If changes were made to include/thread_private.h or if system calls
> # were added/changed then librthread/shlib_version must also be updated.
> diff --git lib/libc/sys/Makefile.inc lib/libc/sys/Makefile.inc
> index 34769576ced..d0b5dd1bdcd 100644
> --- lib/libc/sys/Makefile.inc
> +++ lib/libc/sys/Makefile.inc
> @@ -12,7 +12,8 @@ SRCS+= Ovfork.S brk.S ${CERROR} \
>
> # glue to offer userland wrappers for some syscalls
> SRCS+= posix_madvise.c pthread_sigmask.c \
> - w_fork.c w_sigaction.c w_sigprocmask.c w_sigsuspend.c w_vfork.c
> + w_fork.c w_sigaction.c w_sigprocmask.c w_sigsuspend.c w_vfork.c \
> + w_clock_gettime.c
>
> # glue for compat with old syscall interfaces.
> SRCS+= ftruncate.c lseek.c mquery.c mmap.c ptrace.c semctl.c
> truncate.c \
> @@ -43,7 +44,7 @@ SRCS+= ${CANCEL:%=w_%.c} w_pread.c w_preadv.c
> w_pwrite.c w_pwritev.c
> ASM= __semctl.o __syscall.o __thrsigdivert.o \
> access.o acct.o adjfreq.o adjtime.o \
> bind.o chdir.o chflags.o chflagsat.o chmod.o chown.o chroot.o \
> - clock_getres.o clock_gettime.o clock_settime.o \
> + clock_getres.o clock_settime.o \
> dup.o dup2.o dup3.o \
> execve.o \
> faccessat.o fchdir.o fchflags.o fchmod.o fchmodat.o fchown.o \
> @@ -109,7 +110,7 @@ PPSEUDO_NOERR=${PSEUDO_NOERR:.o=.po}
> SPSEUDO_NOERR=${PSEUDO_NOERR:.o=.so}
> DPSEUDO_NOERR=${PSEUDO_NOERR:.o=.do}
>
> -HIDDEN= ___realpath.o ___getcwd.o fork.o sigaction.o _ptrace.o ${CANCEL:=.o}
> +HIDDEN= ___realpath.o ___getcwd.o fork.o sigaction.o _ptrace.o ${CANCEL:=.o}
> clock_gettime.o
> PHIDDEN=${HIDDEN:.o=.po}
> SHIDDEN=${HIDDEN:.o=.so}
> DHIDDEN=${HIDDEN:.o=.do}
> diff --git lib/libc/sys/w_clock_gettime.c lib/libc/sys/w_clock_gettime.c
> new file mode 100644
> index 00000000000..04850fbda32
> --- /dev/null
> +++ lib/libc/sys/w_clock_gettime.c
> @@ -0,0 +1,109 @@
> +/* $OpenBSD$ */
> +/*
> + * Copyright (c) 2020 Paul Irofti <p...@irofti.net>
> + *
> + * Permission to use, copy, modify, and distribute this software for any
> + * purpose with or without fee is hereby granted, provided that the above
> + * copyright notice and this permission notice appear in all copies.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
> + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
> + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
> + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
> + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
> + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> + */
> +
> +#include <stdlib.h>
> +#include <time.h>
> +#include <err.h>
> +
> +#include <sys/timekeep.h>
> +
> +void *elf_aux_timekeep;
> +
> +
> +/*
> + * Needed exec_elf implementation.
> + * To be exposed by the kernel later if needed.
> + */
> +
> +#include <sys/exec_elf.h>
> +
> +typedef struct {
> + uint32_t au_id; /* 32-bit id */
> + uint64_t au_v; /* 64-bit value */
> +} AuxInfo;
> +
> +enum AuxID {
> + AUX_null = 0,
> + AUX_ignore = 1,
> + AUX_execfd = 2,
> + AUX_phdr = 3, /* &phdr[0] */
> + AUX_phent = 4, /* sizeof(phdr[0]) */
> + AUX_phnum = 5, /* # phdr entries */
> + AUX_pagesz = 6, /* PAGESIZE */
> + AUX_base = 7, /* ld.so base addr */
> + AUX_flags = 8, /* processor flags */
> + AUX_entry = 9, /* a.out entry */
> + AUX_sun_uid = 2000, /* euid */
> + AUX_sun_ruid = 2001, /* ruid */
> + AUX_sun_gid = 2002, /* egid */
> + AUX_sun_rgid = 2003, /* rgid */
> + AUX_openbsd_timekeep = 2004, /* userland clock_gettime */
> +};
> +
> +
> +/*
> + * Helper functions.
> + */
> +
> +int
> +find_timekeep(void)
> +{
> + Elf_Addr *stackp;
> + AuxInfo *auxv;
> +
> + stackp = (Elf_Addr *)environ;
> + while (*stackp++) ; /* pass environment */
> +
> + /* look-up timekeep auxv */
> + for (auxv = (AuxInfo *)stackp; auxv->au_id != AUX_null; auxv++)
> + if (auxv->au_id == AUX_openbsd_timekeep) {
> + elf_aux_timekeep = (void *)auxv->au_v;
> + return 0;
> + }
> +
> + warnx("%s", "Could not find auxv!");
> + return -1;
> +}
> +
> +int
> +WRAP(clock_gettime)(clockid_t clock_id, struct timespec *tp)
> +{
> + struct timekeep *timekeep;
> +
> + if (elf_aux_timekeep == NULL && find_timekeep())
> + return clock_gettime(clock_id, tp);
> + timekeep = elf_aux_timekeep;
> +
> + switch (clock_id) {
> + case CLOCK_REALTIME:
> + *tp = timekeep->tp_realtime;
> + break;
> + case CLOCK_UPTIME:
> + *tp = timekeep->tp_uptime;
> + break;
> + case CLOCK_MONOTONIC:
> + *tp = timekeep->tp_monotonic;
> + break;
> + case CLOCK_BOOTTIME:
> + *tp = timekeep->tp_boottime;
> + break;
> + default:
> + return clock_gettime(clock_id, tp);
> + }
> + return 0;
> +}
> +DEF_WRAP(clock_gettime);
> diff --git sys/kern/exec_elf.c sys/kern/exec_elf.c
> index 9b5b8eb3acf..59bc923a6fb 100644
> --- sys/kern/exec_elf.c
> +++ sys/kern/exec_elf.c
> @@ -124,7 +124,7 @@ extern char *syscallnames[];
> /*
> * How many entries are in the AuxInfo array we pass to the process?
> */
> -#define ELF_AUX_ENTRIES 8
> +#define ELF_AUX_ENTRIES 9
>
> /*
> * This is the OpenBSD ELF emul
> @@ -860,6 +860,10 @@ exec_elf_fixup(struct proc *p, struct exec_package *epp)
> a->au_v = ap->arg_entry;
> a++;
>
> + a->au_id = AUX_openbsd_timekeep;
> + a->au_v = p->p_p->ps_timekeep;
> + a++;
> +
> a->au_id = AUX_null;
> a->au_v = 0;
> a++;
> diff --git sys/kern/kern_exec.c sys/kern/kern_exec.c
> index 20480c2fc28..2496458fde1 100644
> --- sys/kern/kern_exec.c
> +++ sys/kern/kern_exec.c
> @@ -64,6 +64,11 @@
> #include <uvm/uvm_extern.h>
> #include <machine/tcb.h>
>
> +#include <sys/timekeep.h>
> +
> +struct uvm_object *timekeep_object;
> +struct timekeep* timekeep;
> +
> void unveil_destroy(struct process *ps);
>
> const struct kmem_va_mode kv_exec = {
> @@ -76,6 +81,11 @@ const struct kmem_va_mode kv_exec = {
> */
> int exec_sigcode_map(struct process *, struct emul *);
>
> +/*
> + * Map the shared timekeep page.
> + */
> +int exec_timekeep_map(struct process *);
> +
> /*
> * If non-zero, stackgap_random specifies the upper limit of the random gap
> size
> * added to the fixed stack position. Must be n^2.
> @@ -684,6 +694,9 @@ sys_execve(struct proc *p, void *v, register_t *retval)
> /* map the process's signal trampoline code */
> if (exec_sigcode_map(pr, pack.ep_emul))
> goto free_pack_abort;
> + /* map the process's timekeep page */
> + if (exec_timekeep_map(pr))
> + goto free_pack_abort;
>
> #ifdef __HAVE_EXEC_MD_MAP
> /* perform md specific mappings that process might need */
> @@ -863,3 +876,38 @@ exec_sigcode_map(struct process *pr, struct emul *e)
>
> return (0);
> }
> +
> +int exec_timekeep_map(struct process *pr)
> +{
> + size_t timekeep_sz = sizeof(struct timekeep);
> +
> + /*
> + * Similar to the sigcode object, except that there is a single timekeep
> + * object, and not one per emulation.
> + */
> + if (timekeep_object == NULL) {
> + vaddr_t va;
> +
> + timekeep_object = uao_create(timekeep_sz, 0);
> + uao_reference(timekeep_object);
> +
> + if (uvm_map(kernel_map, &va, round_page(timekeep_sz),
> timekeep_object,
> + 0, 0, UVM_MAPFLAG(PROT_READ | PROT_WRITE, PROT_READ |
> PROT_WRITE,
> + MAP_INHERIT_SHARE, MADV_RANDOM, 0))) {
> + uao_detach(timekeep_object);
> + return (ENOMEM);
> + }
> +
> + timekeep = (struct timekeep *)va;
> + }
> +
> + uao_reference(timekeep_object);
> + if (uvm_map(&pr->ps_vmspace->vm_map, &pr->ps_timekeep,
> round_page(timekeep_sz),
> + timekeep_object, 0, 0, UVM_MAPFLAG(PROT_READ, PROT_READ,
> + MAP_INHERIT_COPY, MADV_RANDOM, 0))) {
> + uao_detach(timekeep_object);
> + return (ENOMEM);
> + }
> +
> + return (0);
> +}
> diff --git sys/kern/kern_tc.c sys/kern/kern_tc.c
> index bcf8f689625..007f1116c4f 100644
> --- sys/kern/kern_tc.c
> +++ sys/kern/kern_tc.c
> @@ -35,6 +35,7 @@
> #include <sys/queue.h>
> #include <sys/malloc.h>
> #include <dev/rndvar.h>
> +#include <sys/timekeep.h>
>
> /*
> * A large step happens on boot. This constant detects such steps.
> @@ -209,6 +210,31 @@ microuptime(struct timeval *tvp)
> BINTIME_TO_TIMEVAL(&bt, tvp);
> }
>
> +void
> +tc_clock_gettime(void)
> +{
> + struct bintime bt;
> +
> + if (timekeep == NULL)
> + return;
> +
> + /* CLOCK_REALTIME */
> + nanotime(&timekeep->tp_realtime);
> +
> + /* CLOCK_UPTIME */
> + binuptime(&bt);
> + bintimesub(&bt, &naptime, &bt);
> + BINTIME_TO_TIMESPEC(&bt, &timekeep->tp_uptime);
> +
> + /* CLOCK_MONOTONIC */
> + nanouptime(&timekeep->tp_monotonic);
> +
> + /* CLOCK_BOOTTIME */
> + timekeep->tp_boottime = timekeep->tp_monotonic;
> +
> + return;
> +}
> +
> void
> bintime(struct bintime *bt)
> {
> @@ -613,6 +639,8 @@ tc_windup(struct bintime *new_boottime, struct bintime
> *new_offset,
> time_uptime = th->th_offset.sec;
> membar_producer();
> timehands = th;
> +
> + tc_clock_gettime();
> }
>
> /* Report or change the active timecounter hardware. */
> diff --git sys/sys/exec_elf.h sys/sys/exec_elf.h
> index a40e0510273..f55b75f1e84 100644
> --- sys/sys/exec_elf.h
> +++ sys/sys/exec_elf.h
> @@ -691,7 +691,8 @@ enum AuxID {
> AUX_sun_uid = 2000, /* euid */
> AUX_sun_ruid = 2001, /* ruid */
> AUX_sun_gid = 2002, /* egid */
> - AUX_sun_rgid = 2003 /* rgid */
> + AUX_sun_rgid = 2003, /* rgid */
> + AUX_openbsd_timekeep = 2004, /* userland clock_gettime */
> };
>
> struct elf_args {
> diff --git sys/sys/proc.h sys/sys/proc.h
> index 357c0c0d52c..93a79a220db 100644
> --- sys/sys/proc.h
> +++ sys/sys/proc.h
> @@ -248,6 +248,8 @@ struct process {
> u_int ps_rtableid; /* Process routing table/domain. */
> char ps_nice; /* Process "nice" value. */
>
> + vaddr_t ps_timekeep; /* User pointer to timekeep */
> +
> struct uprof { /* profile arguments */
> caddr_t pr_base; /* buffer base */
> size_t pr_size; /* buffer size */
> diff --git sys/sys/timekeep.h sys/sys/timekeep.h
> new file mode 100644
> index 00000000000..bad25185bc4
> --- /dev/null
> +++ sys/sys/timekeep.h
> @@ -0,0 +1,37 @@
> +/* $OpenBSD$ */
> +/*
> + * Copyright (c) 2020 Paul Irofti <p...@irofti.net>
> + *
> + * Permission to use, copy, modify, and distribute this software for any
> + * purpose with or without fee is hereby granted, provided that the above
> + * copyright notice and this permission notice appear in all copies.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
> + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
> + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
> + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
> + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
> + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> + */
> +
> +#ifndef _SYS_TIMEKEEP_H_
> +#define _SYS_TIMEKEEP_H_
> +
> +#include <sys/time.h>
> +
> +struct timekeep {
> + struct timespec tp_realtime;
> + struct timespec tp_uptime;
> + struct timespec tp_monotonic;
> + struct timespec tp_boottime;
> +};
> +
> +#if defined(_KERNEL)
> +#include <uvm/uvm_extern.h>
> +
> +extern struct uvm_object *timekeep_object;
> +extern struct timekeep *timekeep;
> +#endif
> +
> +#endif /* _SYS_TIMEKEEP_H_ */
>
>
