bug in inets or erlang!

Matthias Lang matthias@REDACTED
Sat Nov 26 17:04:26 CET 2005


I started off by wondering why universaltime_to_localtime() doesn't
work for the date you gave. The relevant files are
erts/emulator/beam/bif.c and erts/emulator/beam/erl_time_sup.c. In 
univ_to_local(), there's a rangecheck on the year. If it's less than
BASEYEAR, the call fails. BASEYEAR is 1970. Real men don't read
manuals, but it'd help all the sissies like me if the manual gave a
clue about that.

The other question is easier to answer---your trace provides all the
information. inets calls univeraltime_to_localtime/1 with an argument
from 1969 because the file you tried to get inets to serve has a 
modification time from 1969. Take a look at the log to see which file
it was.



peter writes:

 > After my FreeBSD server running erlang was restarted, suddenly
 > INETS was not comming up as it was expected to. In the inets
 > error_log I found:
 > > more error_log_16111
 > [26/Nov/2005:13:14:42 -0000] reporting error: traverse exit from apply: mod_get:
 > do =>
 > {badarg,[{erlang,universaltime_to_localtime,[{{1969,12,31},{23,59,59}}]},
 >          {calendar,local_time_to_universal_time_dst,1},
 >          {httpd_util,rfc1123_date,1},
 >          {mod_get,get_modification_date,1},
 >          {mod_get,do_get,1},
 >          {httpd_response,traverse_modules,2},
 >          {httpd_response,generate_and_send_response,1},
 >          {httpd_request_handler,respond,3}]}
 > WHY is inets calling erlang:universaltime_to_localtime/1 with  [{{1969,12,31},{23,59,59}}] ?? Looks like a potential bugg to me OR should this bug actually be located to the erlang module instead? Should this call really result in a crach?
 > Anyhow to get inets up and running again I had to patch the calendar.erl module catching for this crash and in that case return {{1970,1,1},{0,0,0}}. 
 > What need to change here erlang or some module in inets?
 > /PeterPeter Lund
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