The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/compat/cloudabi/cloudabi_clock.c

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    1 /*-
    2  * Copyright (c) 2015 Nuxi, https://nuxi.nl/
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/11.2/sys/compat/cloudabi/cloudabi_clock.c 316327 2017-03-31 08:43:07Z ed $");
   28 
   29 #include <sys/param.h>
   30 #include <sys/proc.h>
   31 #include <sys/stdint.h>
   32 #include <sys/systm.h>
   33 #include <sys/syscallsubr.h>
   34 
   35 #include <contrib/cloudabi/cloudabi_types_common.h>
   36 
   37 #include <compat/cloudabi/cloudabi_proto.h>
   38 #include <compat/cloudabi/cloudabi_util.h>
   39 
   40 /* Converts a CloudABI clock ID to a FreeBSD clock ID. */
   41 static int
   42 cloudabi_convert_clockid(cloudabi_clockid_t in, clockid_t *out)
   43 {
   44         switch (in) {
   45         case CLOUDABI_CLOCK_MONOTONIC:
   46                 *out = CLOCK_MONOTONIC;
   47                 return (0);
   48         case CLOUDABI_CLOCK_PROCESS_CPUTIME_ID:
   49                 *out = CLOCK_PROCESS_CPUTIME_ID;
   50                 return (0);
   51         case CLOUDABI_CLOCK_REALTIME:
   52                 *out = CLOCK_REALTIME;
   53                 return (0);
   54         case CLOUDABI_CLOCK_THREAD_CPUTIME_ID:
   55                 *out = CLOCK_THREAD_CPUTIME_ID;
   56                 return (0);
   57         default:
   58                 return (EINVAL);
   59         }
   60 }
   61 
   62 /* Converts a struct timespec to a CloudABI timestamp. */
   63 int
   64 cloudabi_convert_timespec(const struct timespec *in, cloudabi_timestamp_t *out)
   65 {
   66         cloudabi_timestamp_t s, ns;
   67 
   68         if (in->tv_sec < 0) {
   69                 /* Timestamps from before the Epoch cannot be expressed. */
   70                 *out = 0;
   71                 return (EOVERFLOW);
   72         }
   73         s = in->tv_sec;
   74         ns = in->tv_nsec;
   75         if (s > UINT64_MAX / 1000000000 ||
   76             (s == UINT64_MAX / 1000000000 && ns > UINT64_MAX % 1000000000)) {
   77                 /* Addition of seconds and nanoseconds would overflow. */
   78                 *out = UINT64_MAX;
   79                 return (EOVERFLOW);
   80         }
   81         *out = s * 1000000000 + ns;
   82         return (0);
   83 }
   84 
   85 /* Fetches the time value of a clock. */
   86 int
   87 cloudabi_clock_time_get(struct thread *td, cloudabi_clockid_t clock_id,
   88     cloudabi_timestamp_t *ret)
   89 {
   90         struct timespec ts;
   91         int error;
   92         clockid_t clockid;
   93 
   94         error = cloudabi_convert_clockid(clock_id, &clockid);
   95         if (error != 0)
   96                 return (error);
   97         error = kern_clock_gettime(td, clockid, &ts);
   98         if (error != 0)
   99                 return (error);
  100         return (cloudabi_convert_timespec(&ts, ret));
  101 }
  102 
  103 int
  104 cloudabi_sys_clock_res_get(struct thread *td,
  105     struct cloudabi_sys_clock_res_get_args *uap)
  106 {
  107         struct timespec ts;
  108         cloudabi_timestamp_t cts;
  109         int error;
  110         clockid_t clockid;
  111 
  112         error = cloudabi_convert_clockid(uap->clock_id, &clockid);
  113         if (error != 0)
  114                 return (error);
  115         error = kern_clock_getres(td, clockid, &ts);
  116         if (error != 0)
  117                 return (error);
  118         error = cloudabi_convert_timespec(&ts, &cts);
  119         if (error != 0)
  120                 return (error);
  121         memcpy(td->td_retval, &cts, sizeof(cts));
  122         return (0);
  123 }
  124 
  125 int
  126 cloudabi_sys_clock_time_get(struct thread *td,
  127     struct cloudabi_sys_clock_time_get_args *uap)
  128 {
  129         cloudabi_timestamp_t ts;
  130         int error;
  131 
  132         error = cloudabi_clock_time_get(td, uap->clock_id, &ts);
  133         memcpy(td->td_retval, &ts, sizeof(ts));
  134         return (error);
  135 }

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