[vdr] Re: Setting time without root privileges?

["Juergen Hahn (S)" <juergen.hahn@rbg42.siemens.de>]

Hi,

> I'm not shure whether vdr uses the date command

No, it uses the function "stime" in file eit.c:

bool cMJD::SetSystemTime()
{
   struct tm *ptm;
   time_t loctim;

   struct tm tm_r;
   ptm = localtime_r(&mjdtime, &tm_r);
   loctim = time(NULL);

   if (abs(mjdtime - loctim) > 2)
   {
      isyslog(LOG_INFO, "System Time = %s (%ld)\n", ctime(&loctim),
loctim);
      isyslog(LOG_INFO, "Local Time  = %s (%ld)\n", ctime(&mjdtime),
mjdtime);
      if (stime(&mjdtime) < 0)
         esyslog(LOG_ERR, "ERROR while setting system time: %m");
      return true;
   }

   return false;
}


The man page:

STIME(2)            Linux Programmer's Manual            STIME(2)

NAME
       stime - set time

SYNOPSIS
       #define _SVID_SOURCE /* glibc2 needs this */
       #include <time.h>

       int stime(time_t *t);

DESCRIPTION
       stime  sets  the  system's  idea  of  the  time  and date.  Time,
pointed to by t, is measured in seconds from
       00:00:00 GMT January 1, 1970.  stime() may only be executed by
the super user.

RETURN VALUE
       On success, zero is returned.  On error, -1 is returned, and
errno is set appropriately.

ERRORS
       EPERM  The caller is not the super-user.

CONFORMING TO
       SVr4, SVID, X/OPEN

NOTES
       Under glibc2, <time.h> only provides a prototype when
_SVID_SOURCE is defined.

SEE ALSO
       date(1), settimeofday(2)


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