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compat
compat
 
 
musl
musl
 
 
README.md
README.md
 
 
atexit_dummy.c
atexit_dummy.c
 
 
crt1.c
crt1.c
 
 
crt1_proxy_main.c
crt1_proxy_main.c
 
 
crt1_reactor.c
crt1_reactor.c
 
 
dynlink.c
dynlink.c
 
 
emscripten_console.c
emscripten_console.c
 
 
emscripten_fiber.c
emscripten_fiber.c
 
 
emscripten_get_heap_size.c
emscripten_get_heap_size.c
 
 
emscripten_internal.h
emscripten_internal.h
 
 
emscripten_libc_stubs.c
emscripten_libc_stubs.c
 
 
emscripten_memcpy.c
emscripten_memcpy.c
 
 
emscripten_memcpy_big.S
emscripten_memcpy_big.S
 
 
emscripten_memmove.c
emscripten_memmove.c
 
 
emscripten_memset.c
emscripten_memset.c
 
 
emscripten_memset_big.S
emscripten_memset_big.S
 
 
emscripten_mmap.c
emscripten_mmap.c
 
 
emscripten_scan_stack.c
emscripten_scan_stack.c
 
 
emscripten_syscall_stubs.c
emscripten_syscall_stubs.c
 
 
emscripten_time.c
emscripten_time.c
 
 
kill.c
kill.c
 
 
mktime.c
mktime.c
 
 
pthread_sigmask.c
pthread_sigmask.c
 
 
raise.c
raise.c
 
 
sbrk.c
sbrk.c
 
 
sigaction.c
sigaction.c
 
 
sigtimedwait.c
sigtimedwait.c
 
 
tzset.c
tzset.c
 
 
wasi-helpers.c
wasi-helpers.c
 
 

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 emscripten-core#15483.