DateTimePicker raises a segmentation fault #9
Comments
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The following example of date_picker often raises a segmentation fault.
require 'libui'
UI = LibUI
UI.init
vbox = UI.new_vertical_box
date_time_picker = UI.new_date_picker
time = UI::FFI::TM.malloc
@hoge = proc do
UI.date_time_picker_time(date_time_picker, time)
# p sec: time.tm_sec,
# min: time.tm_min,
# hour: time.tm_hour,
# mday: time.tm_mday,
# mon: time.tm_mon,
# year: time.tm_year,
# wday: time.tm_wday,
# yday: time.tm_yday,
# isdst: time.tm_isdst
end
UI.date_time_picker_on_changed(date_time_picker, @hoge)
UI.box_append(vbox, date_time_picker, 1)
main_window = UI.new_window('Date Time Pickers', 300, 200, 1)
UI.window_on_closing(main_window) do
puts 'Bye Bye'
UI.control_destroy(main_window)
UI.quit
0
end
UI.window_set_child(main_window, vbox)
UI.control_show(main_window)
UI.main
UI.quitErrors
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An example of an error log. |
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Finally, @kou's investigation revealed the cause.
diff --git a/lib/libui/ffi.rb b/lib/libui/ffi.rb
index e85f265..36c998d 100644
--- a/lib/libui/ffi.rb
+++ b/lib/libui/ffi.rb
@@ -223,7 +223,9 @@ module LibUI
'int tm_year',
'int tm_wday',
'int tm_yday',
- 'int tm_isdst'
+ 'int tm_isdst',
+ 'long __tm_gmtoff',
+ 'const char *__tm_zone',
]https://stackoverflow.com/questions/13969210/size-of-struct-tm |
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One idea would be to create a C extension library and add #include "tmsize.h"
void
Init_tmsize(void)
{
struct tm tm;
rb_require("fiddle");
ID sym_mFiddle = rb_intern("Fiddle");
VALUE rb_mFiddle = rb_const_get(rb_cObject, sym_mFiddle);
rb_define_const(rb_mFiddle, "SIZEOF_STRUCT_TM", INT2FIX(sizeof(s)));
}This is used in the following way. require 'tmsize'
ptr = FiddlePointer.new(Fiddle::SIZEOF_STRUCT_TM)
tm = LibUI::FFI::TM.new(ptr)But I don't want to use the C extension. I would like libui to work even if the C development environment is not installed. |
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I decided to change the size of the structure only when using Windows. If you find any problems, please report them to me. # time.h
TM = if Fiddle::WINDOWS
struct [
'int tm_sec',
'int tm_min',
'int tm_hour',
'int tm_mday',
'int tm_mon',
'int tm_year',
'int tm_wday',
'int tm_yday',
'int tm_isdst'
]
else # The GNU C Library (glibc)
struct [
'int tm_sec',
'int tm_min',
'int tm_hour',
'int tm_mday',
'int tm_mon',
'int tm_year',
'int tm_wday',
'int tm_yday',
'int tm_isdst',
'long tm_gmtoff',
'const char *tm_zone'
]
end |
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The DateTimePicker sample generates a segmentation fault and does not work as expected.
I don't know why, but it is possible that access to the memory of the LibUI::FFI::TM structure is happening after it has been released.
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