> > > The stack-trace and abort-debug modules are now in a state where they > > > can be documented. Done as follows: > > > > Thanks. Are these modules safe to use in signal handlers? > > No, they aren't.
They aren't. But you can still get a stack traces, even from signal handlers, with some additional work. Ian Lance Taylor has added this documentation to libbacktrace, just yesterday: In general the functions provided by this library are async-signal-safe, meaning that they may be safely called from a signal handler. That said, on systems that use `dl_iterate_phdr`, such as GNU/Linux, the first call to a libbacktrace function will call `dl_iterate_phdr`, which is not in general async-signal-safe. Therefore, programs that call libbacktrace from a signal handler should ensure that they make an initial call from outside of a signal handler. Similar considerations apply when arranging to call libbacktrace from within malloc; `dl_iterate_phdr` can also call malloc, so make an initial call to a libbacktrace function outside of malloc before trying to call libbacktrace functions within malloc. Bruno
