1  /*
       2   * tzset.c
       3   *
       4   * Quick and dirty emulation of tzset(), tzname[], and daylight
       5   * for old BSD systems without it.
       6   *
       7   * Thanks to Rick Adams, rick@uunet.uu.net, for the basics.
       8   *
       9   * BUGS:
      10   *	Totally ignores the value of the TZ environment variable.
      11   */
      12  
      13  #if 0
      14  #include <time.h>
      15  #endif
      16  #include <sys/time.h>
      17  
      18  static char tz1[1024];
      19  static char tz2[1024];
      20  
      21  /* external variables */
      22  char *tzname[2] = {
      23  	tz1, tz2
      24  };
      25  int daylight;
      26  
      27  extern char *timezone();
      28  
      29  void
      30  tzset()
      31  {
      32  	struct timeval tp;
      33  	struct timezone tz;
      34  
      35  	(void) gettimeofday(&tp, &tz);
      36  	(void) strcpy(tz1, timezone(tz.tz_minuteswest, 0));
      37  	(void) strcpy(tz2, timezone(tz.tz_minuteswest, 1));
      38  	daylight = tz.tz_dsttime;
      39  }