segv-handler-gdb is a gem for debugging C extension that causes
SEGV. It dumps C level backtrace by GDB on SEGV. If your C extension
is built with
gcc -O0 -g3, the backtrace includes useful information
segv-handler-gdb works on Linux. It may also work on other POSIX systems such as FreeBSD and OS X but it is not tested yet.
Here is a list of supported platform:
- Debian GNU/Linux
- (If you confirm that segv-handler-gdb works on your platform, please report it.)
Here is a list of required programs:
% gem install segv-handler-gdb
You just require segv-handler-gdb library like the following:
You can use segv-handler-gdb without changing your Ruby script:
% ruby -rsegv-handler-gdb YOUR-RUBY-SCRIPT.rb
If your Ruby script crashes, you find C level backtrace at
You can customize segv-handler-gdb behavior by some environment variables.
Backtrace dump path
Backtrace is dumped to
default. You can customize the path by
There are some special values for the environment variable:
-: Backtrace is dumped to the standard output.
+: Backtrace is dumped to the standard error output.
Here is a sample command line to dump backtrace to the standard output:
% SEGV_HANDLER_GDB_PATH=- ruby -rsegv-handlder-gdb YOUR-RUBY-SCRIPT.rb
Temporary directory path
segv-handler-gdb creates a temporary file to temporary
/tmp directory is used as the temporary directory by
default. You can customize the temporary directory by the following
The order of the above list shows priority. If
TMPDIR is specified,
TMP is not used.
If all of these environment variables aren't specified,
/tmp is used
as the temporary directory.
- Kouhei Sutou <firstname.lastname@example.org>
LGPLv3 or later. See doc/text/lgpl-3.txt for details.