src/time/timer_settime.c

   1 #include <time.h>
   2 #include <limits.h>
   3 #include "pthread_impl.h"
   4
   5 #define IS32BIT(x) !((x)+0x80000000ULL>>32)
   6
   7 int timer_settime(timer_t t, int flags, const struct itimerspec *restrict val, struct itimerspec *restrict old)
   8 {
   9         if ((intptr_t)t < 0) {
  10                 pthread_t td = (void *)((uintptr_t)t << 1);
  11                 t = (void *)(uintptr_t)(td->timer_id & INT_MAX);
  12         }
  13 #ifdef SYS_timer_settime64
  14         time_t is = val->it_interval.tv_sec, vs = val->it_value.tv_sec;
  15         long ins = val->it_interval.tv_nsec, vns = val->it_value.tv_nsec;
  16         int r = -ENOSYS;
  17         if (SYS_timer_settime == SYS_timer_settime64
  18             || !IS32BIT(is) || !IS32BIT(vs) || (sizeof(time_t)>4 && old))
  19                 r = __syscall(SYS_timer_settime64, t, flags,
  20                         ((long long[]){is, ins, vs, vns}), old);
  21         if (SYS_timer_settime == SYS_timer_settime64 || r!=-ENOSYS)
  22                 return __syscall_ret(r);
  23         if (!IS32BIT(is) || !IS32BIT(vs))
  24                 return __syscall_ret(-ENOTSUP);
  25         long old32[4];
  26         r = __syscall(SYS_timer_settime, t, flags,
  27                 ((long[]){is, ins, vs, vns}), old32);
  28         if (!r && old) {
  29                 old->it_interval.tv_sec = old32[0];
  30                 old->it_interval.tv_nsec = old32[1];
  31                 old->it_value.tv_sec = old32[2];
  32                 old->it_value.tv_nsec = old32[3];
  33         }
  34         return __syscall_ret(r);
  35 #endif
  36         return syscall(SYS_timer_settime, t, flags, val, old);
  37 }