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chromium / external / github.com / emscripten-core / emscripten / 8dc2f005ccaede80bee63d3dbad7f716f224dab0 / . / system / lib / libc
tree: 12ba79a6bb1d31d9537983de2b1a1643c2a4452a [path history] [tgz]
  1. compat/
  2. musl/
  3. atexit_dummy.c
  4. crt1.c
  5. crt1_reactor.c
  6. dynlink.c
  7. emscripten_console.c
  8. emscripten_get_heap_size.c
  9. emscripten_libc_stubs.c
  10. emscripten_memcpy.c
  11. emscripten_memmove.c
  12. emscripten_memset.c
  13. emscripten_mmap.c
  14. emscripten_scan_stack.c
  15. emscripten_syscall_stubs.c
  16. emscripten_time.c
  17. kill.c
  18. pthread_sigmask.c
  19. raise.c
  20. README.md
  21. sigaction.c
  22. sigtimedwait.c
  23. wasi-helpers.c
system/lib/libc/README.md

This folder contains the musl version of libc at /musl. The upstream version can be found at http://www.musl-libc.org/.

Most of the source comes from musl v1.2.2, with some exceptions listed below. We track these changes from upstream in https://github.com/emscripten-core/musl and use a script (system/lib/update_musl.py) to pull in updates.

Some changes have been made to the version that was taken from upstream, including:

  • Emscripten-specific changes (from before this readme existed). These should be marked with XXX EMSCRIPTEN in the source, or ifdefed with #if __EMSCRIPTEN__. They are mostly in pthreads code and hopefully temporary.
  • Backporting an operator-precedence warning fix from 6e76e1540fc58a418494bf5eb832b556f9c5763e in the upstream version.
  • Switch to using the wasi fd_write syscall instead of writev.
  • Simplify stdout stream handling: do not support seeking, terminal handling, etc., as it just increases code size and Emscripten doesn't have those features anyhow.
  • Setting _POSIX_REALTIME_SIGNALS and _POSIX_SPAWN macros to -1, to exclude unsupported functions.

Copy log.c and log2.c from ealier version of musl which result in smaller binary size since they do not rely data tables in log_data.c and log2_data.c. See https://github.com/emscripten-core/emscripten/issues/15483.