Re: BEAST on FreeBSD: timezone

On 11 Feb 2004, Rasmus Kaj wrote:

> Hi!  I get this warning when building beast on FreeBSD 5.2:
> sfitime.c:62: warning: assignment makes integer from pointer without a cast
> (See code below.)  Later, make check fails to convert a numeric time
> to a string and back to the same value (in testsfi.c:81), and I think
> this warning is what causes that.
> It seems that timezone is supposed to be an integer value, but FreeBSD
> can't find the value (and neither can I).  Instead it find the
> timezone that is a part of libc, which is a function, so using it as a
> value will yield the pointer value to that function.
> So, what are the timezone value supposed to come from?
> void
> _sfi_init_time (void)
> {
>   static gboolean initialized = FALSE;
>   struct timeval tv = { 0, };
>   time_t t;
>   gint error;
>   g_assert (initialized++ == FALSE);
>   tzset ();
>   error = gettimeofday (&tv, NULL);
>   if (error)
>     sfi_info ("gettimeofday() failed: %s", g_strerror (errno));
>   t = tv.tv_sec + tv.tv_usec / 1000000;
>   localtime (&t);
>   gmt_diff = timezone;                 /* This is sfitime.c:62 */

eek, we need that value to transfrom between UTC times in bse files, and the
local time handling used in the program. i've appended the timezone manual page
from linux, so you know what the value is exactly. then, we'll need to find
a FreeBSD equivalent for that.

>   gmt_diff *= SFI_USEC_FACTOR;
> }
> --
> Rasmus Kaj -----------------------------------------------
>  \                   An NT server can be run by an idiot, and usually is


TZSET(3)                   Linux Programmer's Manual                  TZSET(3)

       tzset, tzname, timezone, daylight - initialize time conversion informa-

       ##iinncclluuddee <<ttiimmee..hh>>

       vvooiidd ttzzsseett ((vvooiidd));;

       eexxtteerrnn cchhaarr **_t_z_n_a_m_e[[22]];;
       eexxtteerrnn lloonngg _t_i_m_e_z_o_n_e;;
       eexxtteerrnn iinntt _d_a_y_l_i_g_h_t;;

       The ttzzsseett(()) function initializes the _t_z_n_a_m_e variable from the TZ  envi-
       ronment  variable.   This function is automatically called by the other
       time conversion functions that depend on the time zone.  In a SysV-like
       environment  it  will  also set the variables _t_i_m_e_z_o_n_e (seconds West of
       GMT) and _d_a_y_l_i_g_h_t (0 if this time zone does not have any daylight  sav-
       ings  time  rules, nonzero if there is a time during the year when day-
       light savings time applies).

       If the TZ variable does not appear in the environment, the _t_z_n_a_m_e vari-
       able  is  initialized  with  the best approximation of local wall clock
       time, as specified by the ttzzffiillee(5)-format file _l_o_c_a_l_t_i_m_e found in  the
       system   timezone   directory   (see  below).   (One  also  often  sees
       _/_e_t_c_/_l_o_c_a_l_t_i_m_e used here, a symlink to the right  file  in  the  system
       timezone directory.)

       If the TZ variable does appear in the environment but its value is NULL
       or its value cannot be interpreted using any of the  formats  specified
       below, Coordinated Universal Time (UTC) is used.

       The  value of TZ can be one of three formats.  The first format is used
       when there is no daylight saving time in the local time zone:

              _s_t_d _o_f_f_s_e_t

       The _s_t_d string specifies the name of the time zone and must be three or
       more  alphabetic characters.  The _o_f_f_s_e_t string immediately follows _s_t_d
       and specifies the time value to be added to the local time to get Coor-
       dinated Universal Time (UTC).  The _o_f_f_s_e_t is positive if the local time
       zone is west of the Prime Meridian and negative if  it  is  east.   The
       hour must be between 0 and 24, and the minutes and seconds 0 and 59.

       The second format is used when there is daylight saving time:

              _s_t_d _o_f_f_s_e_t _d_s_t _[_o_f_f_s_e_t_]_,_s_t_a_r_t_[_/_t_i_m_e_]_,_e_n_d_[_/_t_i_m_e_]

       There  are  no spaces in the specification.  The initial _s_t_d and _o_f_f_s_e_t
       specify the standard time zone, as described above.  The _d_s_t string and
       _o_f_f_s_e_t  specify the name and offset for the corresponding daylight sav-
       ings time zone.  If the offset is omitted, it  defaults   to  one  hour
       ahead of standard time.

       The  _s_t_a_r_t  field specifies when daylight savings time goes into effect
       and the _e_n_d field specifies when the change is made  back  to  standard
       time.  These fields may have the following formats:

       J_n     This  specifies the Julian day with _n between 1 and 365.  Febru-
              ary 29 is never counted even in leap years.

       _n      This specifies the Julian day with _n between 1 and 365.   Febru-
              ary 29 is counted in leap years.

       M_m._w._d This  specifies  day  _d (0 <= _d <= 6) of week _w (1 <= _w <= 5) of
              month _m (1 <= _m <= 12).  Week 1 is the first week in which day _d
              occurs and week 5 is the last week in which day _d occurs.  Day 0
              is a Sunday.

       The _t_i_m_e fields specify when, in the local time  currently  in  effect,
       the  change  to  the  other  time  occurs.   If omitted, the default is

       The third format specifies that the time  zone  information  should  be
       read from a file:


       If  the  file specification _f_i_l_e_s_p_e_c is omitted, the time zone informa-
       tion is read from the file _l_o_c_a_l_t_i_m_e in the system timezone  directory,
       which  nowadays  usually  is  _/_u_s_r_/_s_h_a_r_e_/_z_o_n_e_i_n_f_o.   This  file  is  in
       ttzzffiillee(5)  format.   If  _f_i_l_e_s_p_e_c  is  given,  it   specifies   another
       ttzzffiillee(5)-format file to read the time zone information from.  If _f_i_l_e_-
       _s_p_e_c does not begin with a `/', the file specification is  relative  to
       the system timezone directory.

       The  system  time  zone  directory used depends on the (g)libc version.
       Libc4 and libc5 use _/_u_s_r_/_l_i_b_/_z_o_n_e_i_n_f_o, and, since libc-5.4.6, when this
       doesn't  work, will try _/_u_s_r_/_s_h_a_r_e_/_z_o_n_e_i_n_f_o.  Glibc2 will use the envi-
       ronment variable TZDIR, when that exists.  Its default depends  on  how
       it was installed, but normally is _/_u_s_r_/_s_h_a_r_e_/_z_o_n_e_i_n_f_o.

       This timezone directory contains the files
       localtime      local time zone file
       posixrules     rules for POSIX-style TZ's

       Often  _/_e_t_c_/_l_o_c_a_l_t_i_m_e is a symlink to the file _l_o_c_a_l_t_i_m_e or to the cor-
       rect time zone file in the system time zone directory.

       SVID 3, POSIX, BSD 4.3

       Note that the variable _d_a_y_l_i_g_h_t does not indicate that daylight savings
       time  applies  right  now. It used to give the number of some algorithm
       (see the variable _t_z___d_s_t_t_i_m_e in ggeettttiimmeeooffddaayy(2)).  It has been obsolete
       for many years but is required by SUSv2.

       BSD4.3 had a routine _c_h_a_r _*_t_i_m_e_z_o_n_e_(_z_o_n_e_,_d_s_t_) that returned the name of
       the time zone corresponding to its  first  argument  (minutes  West  of
       GMT).  If the second argument was 0, the standard name was used, other-
       wise the daylight savings time version.

       ddaattee(1), ggeettttiimmeeooffddaayy(2), ttiimmee(2), ccttiimmee(3), ggeetteennvv(3), ttzzffiillee(5)

                                  2001-11-13                          TZSET(3)

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