src/common/compat/time.hpp

   1 /*
   2  * Copyright (C) 2016 Michael Jeanson <mjeanson@efficios.com>
   3  *
   4  * SPDX-License-Identifier: MIT
   5  *
   6  */
   7
   8 #ifndef _COMPAT_TIME_H
   9 #define _COMPAT_TIME_H
  10
  11 #include <time.h>
  12
  13 #ifdef __APPLE__
  14
  15 #include <cstdint>
  16
  17 typedef uint64_t timer_t;
  18
  19 #include <mach/mach.h>
  20 #include <mach/clock.h>
  21 #include <common/compat/errno.hpp>
  22
  23 #undef NSEC_PER_SEC
  24 #undef NSEC_PER_MSEC
  25 #undef NSEC_PER_USEC
  26 #undef USEC_PER_SEC
  27
  28 #endif /* __APPLE__ */
  29
  30 /* macOS/OS X 10.12 (Sierra) and up provide clock_gettime() */
  31 #if defined(__APPLE__) && !defined(LTTNG_HAVE_CLOCK_GETTIME)
  32
  33 typedef int clockid_t;
  34 #define CLOCK_REALTIME CALENDAR_CLOCK
  35 #define CLOCK_MONOTONIC SYSTEM_CLOCK
  36
  37 static inline
  38 int lttng_clock_gettime(clockid_t clk_id, struct timespec *tp)
  39 {
  40         int ret = 0;
  41         clock_serv_t clock;
  42         mach_timespec_t now;
  43
  44         if (clk_id != CLOCK_REALTIME && clk_id != CLOCK_MONOTONIC) {
  45                 ret = -1;
  46                 errno = EINVAL;
  47                 goto end;
  48         }
  49
  50         host_get_clock_service(mach_host_self(), clk_id, &clock);
  51
  52         ret = clock_get_time(clock, &now);
  53         if (ret != KERN_SUCCESS) {
  54                 ret = -1;
  55                 goto deallocate;
  56         }
  57
  58         tp->tv_sec = now.tv_sec;
  59         tp->tv_nsec = now.tv_nsec;
  60
  61 deallocate:
  62         mach_port_deallocate(mach_task_self(), clock);
  63 end:
  64         return ret;
  65 }
  66
  67 #else /* __APPLE__ && !LTTNG_HAVE_CLOCK_GETTIME */
  68
  69 static inline
  70 int lttng_clock_gettime(clockid_t clk_id, struct timespec *tp)
  71 {
  72         return clock_gettime(clk_id, tp);
  73 }
  74
  75 #endif /* __APPLE__ && !LTTNG_HAVE_CLOCK_GETTIME */
  76
  77 #endif /* _COMPAT_TIME_H */