external/bsd/ntp/dist/include/ntp_syscall.h

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * ntp_syscall.h - various ways to perform the ntp_adjtime() and ntp_gettime()
   5  *                 system calls.
   6  */
   7
   8 #ifndef NTP_SYSCALL_H
   9 #define NTP_SYSCALL_H
  10
  11 #ifdef HAVE_CONFIG_H
  12 #include <config.h>
  13 #endif
  14
  15 #ifdef HAVE_SYS_TIMEX_H
  16 # include <sys/timex.h>
  17 #endif
  18
  19 #ifndef NTP_SYSCALLS_LIBC
  20 #ifdef NTP_SYSCALLS_STD
  21 # define ntp_adjtime(t)         syscall(SYS_ntp_adjtime, (t))
  22 # define ntp_gettime(t)         syscall(SYS_ntp_gettime, (t))
  23 #else /* !NTP_SYSCALLS_STD */
  24 # ifdef HAVE___ADJTIMEX
  25 extern  int     __adjtimex      (struct timex *);
  26
  27 #  define ntp_adjtime(t)        __adjtimex((t))
  28
  29 #ifndef HAVE_STRUCT_NTPTIMEVAL
  30 struct ntptimeval
  31 {
  32   struct timeval time;  /* current time (ro) */
  33   long int maxerror;    /* maximum error (us) (ro) */
  34   long int esterror;    /* estimated error (us) (ro) */
  35 };
  36 #endif
  37
  38 static inline int
  39 ntp_gettime(
  40         struct ntptimeval *ntv
  41         )
  42 {
  43         struct timex tntx;
  44         int result;
  45
  46         tntx.modes = 0;
  47         result = __adjtimex (&tntx);
  48         ntv->time = tntx.time;
  49         ntv->maxerror = tntx.maxerror;
  50         ntv->esterror = tntx.esterror;
  51 #ifdef NTP_API
  52 # if NTP_API > 3
  53         ntv->tai = tntx.tai;
  54 # endif
  55 #endif
  56         return(result);
  57 }
  58 # else /* !HAVE__ADJTIMEX */
  59 #  ifdef HAVE___NTP_GETTIME
  60 #   define ntp_gettime(t)       __ntp_gettime((t))
  61 #  endif
  62 # endif /* !HAVE_ADJTIMEX */
  63 #endif /* !NTP_SYSCALLS_STD */
  64 #endif /* !NTP_SYSCALLS_LIBC */
  65
  66 #endif /* NTP_SYSCALL_H */