公共C库，用于为SIGSEGV安装标准信号处理程序

Question

Is here any C library with a function like install_default_signal_handlers() which will install some default signal handler for SIGSEGV and related signals, where the signal handler will print a backtrace? The signal handler, and also the installation of the signal handler should be provided by the library.

I think backward-cpp does it for C++ with backward::SignalHandling sh; .

There is also Google Breakpad but this might be overkill.

There is libSegFault which seems to do that but it only seems to be available on some Unixes (part of GlibC, and there is a FreeBSD implementation), not on MacOSX.

Some related discussion is here but this discusses mostly the code to print the backtrace but I search for a library which provides the signal handler for me.

Answer 1

There's no default handler installed for SIGSEGV on any of the *nix systems. But you can 1) install one yourself, 2) print the backtrace and 3) then exit. The "exit" part is required becuase, it's undefined to return from their handler (if one is installed) for some signals; SIGSEGV is one of them.

The tricky part is (2) - printing the backtrace. Glibc provides 3 interfaces : backtrace , backtrace_symbols and backtrace_symbols_fd . You can use whichever is suitable and print the stack trace.

If you are not using Glibc then you may have to do more work. For example, you can use _Unwind_Backtrace which is available on systems using gcc (not necessarily Glibc).