src/common/compat/time.h

   1 /*
   2  * Copyright (C) 2016 Michael Jeanson <mjeanson@efficios.com>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  * SOFTWARE.
  21  */
  22
  23 #ifndef _COMPAT_TIME_H
  24 #define _COMPAT_TIME_H
  25
  26 #include <time.h>
  27
  28 #ifdef __APPLE__
  29
  30 typedef uint64_t timer_t;
  31
  32 #include <mach/mach.h>
  33 #include <mach/clock.h>
  34 #include <errno.h>
  35
  36 #undef NSEC_PER_SEC
  37 #undef NSEC_PER_MSEC
  38 #undef NSEC_PER_USEC
  39
  40 #endif /* __APPLE__ */
  41
  42 /* macOS/OS X 10.12 (Sierra) and up provide clock_gettime() */
  43 #if defined(__APPLE__) && !defined(LTTNG_HAVE_CLOCK_GETTIME)
  44
  45 typedef int clockid_t;
  46 #define CLOCK_REALTIME CALENDAR_CLOCK
  47 #define CLOCK_MONOTONIC SYSTEM_CLOCK
  48
  49 static inline
  50 int lttng_clock_gettime(clockid_t clk_id, struct timespec *tp)
  51 {
  52         int ret = 0;
  53         clock_serv_t clock;
  54         mach_timespec_t now;
  55
  56         if (clk_id != CLOCK_REALTIME && clk_id != CLOCK_MONOTONIC) {
  57                 ret = -1;
  58                 errno = EINVAL;
  59                 goto end;
  60         }
  61
  62         host_get_clock_service(mach_host_self(), clk_id, &clock);
  63
  64         ret = clock_get_time(clock, &now);
  65         if (ret != KERN_SUCCESS) {
  66                 ret = -1;
  67                 goto deallocate;
  68         }
  69
  70         tp->tv_sec = now.tv_sec;
  71         tp->tv_nsec = now.tv_nsec;
  72
  73 deallocate:
  74         mach_port_deallocate(mach_task_self(), clock);
  75 end:
  76         return ret;
  77 }
  78
  79 #else /* __APPLE__ && !LTTNG_HAVE_CLOCK_GETTIME */
  80
  81 static inline
  82 int lttng_clock_gettime(clockid_t clk_id, struct timespec *tp)
  83 {
  84         return clock_gettime(clk_id, tp);
  85 }
  86
  87 #endif /* __APPLE__ && !LTTNG_HAVE_CLOCK_GETTIME */
  88
  89 #endif /* _COMPAT_TIME_H */