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Diffstat (limited to 'src/libmain/shared.hh')
| -rw-r--r-- | src/libmain/shared.hh | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/libmain/shared.hh b/src/libmain/shared.hh index 0cc56d47d..66d29a1f7 100644 --- a/src/libmain/shared.hh +++ b/src/libmain/shared.hh @@ -113,5 +113,24 @@ struct PrintFreed /* Install a SIGSEGV handler to detect stack overflows. */ void detectStackOverflow(); +/* Pluggable behavior to run before _exit(1) in case of a stack overflow. + + Default value: do nothing, return immediately. + + This is called by the handler installed by detectStackOverflow(). + + This gives Nix library consumers a limit opportunity to report the error + condition. + + NOTE: Use with diligence, because this runs in the signal handler, with very + limited stack space and a potentially a corrupted heap, all while the failed + thread is blocked indefinitely. All functions called must be reentrant. */ +extern std::function<void(siginfo_t * info, void * ctx)> stackOverflowHandler; + +/* The default, robust implementation of stackOverflowHandler. + + Prints an error message directly to stderr using a syscall instead of the + logger. Exits the process immediately after. */ +void defaultStackOverflowHandler(siginfo_t * info, void * ctx); } |