[#absl-FailureSignalHandlerOptions-writerfn]
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If non‐null, indicates a pointer to a callback function that will be called upon failure, with a string argument containing failure data. This function may be used as a hook to write failure data to a secondary location, such as a log file. This function will also be called with null data, as a hint to flush any buffered data before the program may be terminated. Consider flushing any buffered data in all calls to this function.

== Synopsis

Declared in `<absl/debugging/failure_signal_handler.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void(* writerfn)(char const*) = nullptr;
----

== Description

Since this function runs within a signal handler, it should be async‐signal‐safe if possible. See http://man7.org/linux/man‐pages/man7/signal‐safety.7.html


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