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Document __register_atfork.

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Bug: https://github.com/android-ndk/ndk/issues/964
Test: N/A
Change-Id: I5f3fa4c7fa42abde05f5b5fe730748d8c5fb4bb2
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Elliott Hughes 2019-04-22 08:57:36 -07:00
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android-changes-for-ndk-developers.md
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@ -330,6 +330,16 @@ default. Ensure you're using the current NDK and that you haven't
configured your build system to generate incorrect SONAME entries (using
the -soname linker option).
## `__register_atfork` (Available in API level >= 23)
To allow `atfork` and `pthread_atfork` handlers to be unregistered on
`dlclose`, the implementation changed in API level 23. Unfortunately this
requires a new libc function `__register_atfork`. Code using these functions
that is built with a target API level >= 23 therefore will not load on earlier
versions of Android, with an error referencing `__register_atfork`.
*Resolution*: build your code with an NDK target API level that matches your
app's minimum API level, or avoid using `atfork`/`pthread_atfork`.
## DT_RUNPATH support (Available in API level >= 24)