src/linux/timerfd.c

   1 #include <sys/timerfd.h>
   2 #include <errno.h>
   3 #include "syscall.h"
   4
   5 #define IS32BIT(x) !((x)+0x80000000ULL>>32)
   6
   7 int timerfd_create(int clockid, int flags)
   8 {
   9         return syscall(SYS_timerfd_create, clockid, flags);
  10 }
  11
  12 int timerfd_settime(int fd, int flags, const struct itimerspec *new, struct itimerspec *old)
  13 {
  14 #ifdef SYS_timerfd_settime64
  15         time_t is = new->it_interval.tv_sec, vs = new->it_value.tv_sec;
  16         long ins = new->it_interval.tv_nsec, vns = new->it_value.tv_nsec;
  17         int r = -ENOSYS;
  18         if (SYS_timerfd_settime == SYS_timerfd_settime64
  19             || !IS32BIT(is) || !IS32BIT(vs) || (sizeof(time_t)>4 && old))
  20                 r = __syscall(SYS_timerfd_settime64, fd, flags,
  21                         ((long long[]){is, ins, vs, vns}), old);
  22         if (SYS_timerfd_settime == SYS_timerfd_settime64 || r!=-ENOSYS)
  23                 return __syscall_ret(r);
  24         if (!IS32BIT(is) || !IS32BIT(vs))
  25                 return __syscall_ret(-ENOTSUP);
  26         long old32[4];
  27         r = __syscall(SYS_timerfd_settime, fd, flags,
  28                 ((long[]){is, ins, vs, vns}), old32);
  29         if (!r && old) {
  30                 old->it_interval.tv_sec = old32[0];
  31                 old->it_interval.tv_nsec = old32[1];
  32                 old->it_value.tv_sec = old32[2];
  33                 old->it_value.tv_nsec = old32[3];
  34         }
  35         return __syscall_ret(r);
  36 #endif
  37         return syscall(SYS_timerfd_settime, fd, flags, new, old);
  38 }
  39
  40 int timerfd_gettime(int fd, struct itimerspec *cur)
  41 {
  42 #ifdef SYS_timerfd_gettime64
  43         int r = -ENOSYS;
  44         if (sizeof(time_t) > 4)
  45                 r = __syscall(SYS_timerfd_gettime64, fd, cur);
  46         if (SYS_timerfd_gettime == SYS_timerfd_gettime64 || r!=-ENOSYS)
  47                 return __syscall_ret(r);
  48         long cur32[4];
  49         r = __syscall(SYS_timerfd_gettime, fd, cur32);
  50         if (!r) {
  51                 cur->it_interval.tv_sec = cur32[0];
  52                 cur->it_interval.tv_nsec = cur32[1];
  53                 cur->it_value.tv_sec = cur32[2];
  54                 cur->it_value.tv_nsec = cur32[3];
  55         }
  56         return __syscall_ret(r);
  57 #endif
  58         return syscall(SYS_timerfd_gettime, fd, cur);
  59 }