| # bionic documentation |
| |
| [bionic](https://en.wikipedia.org/wiki/Bionic_(software)) is Android's |
| C library, math library, and dynamic linker. |
| |
| ## User documentation |
| |
| * [Android bionic status](status.md) - where we are in terms of standards, |
| and what changed with each OS release. |
| * [32-bit ABI bugs](32-bit-abi.md) - historical accidents we can never fix. |
| * [`EINTR`](EINTR.md) - what is the `EINTR` failure, |
| and how can code deal with it? |
| * [When to use which `#define`](defines.md) - how to choose between |
| `__ANDROID__` and `__BIONIC__` and all the other options for conditional |
| compilation. |
| * [fdsan](fdsan.md) - bionic's file descriptor sanitizer, |
| which detects use-after-close() bugs. |
| * [fdtrack](fdtrack.md) - bionic's file descriptor tracker, |
| which helps debug file descriptor leaks. |
| * [C23](c23.md) - dealing with C23's breaking changes. |
| |
| ## Maintainer documentation |
| |
| If you're trying to make changes to bionic _itself_, start with the |
| [bionic maintainer documentation](../README.md). |
| |
| We also have more detail on several specific parts of the implementation: |
| |
| * [The anatomy of bionic's `_FORTIFY_SOURCE`](clang_fortify_anatomy.md) - |
| how does `_FORTIFY_SOURCE` work on bionic (primarily "with clang"). |
| * [Android ELF TLS](elf-tls.md) - details of bionic's ELF TLS implementation. |
| * [Validating libc assembler](libc_assembler.md) - how to test changes to |
| libc assembler routines. |
| * [Validating native allocator changes](native_allocator.md) - how to test |
| changes to the native allocator. |
