WebAssembly/wasi-libc

View on GitHub

WASI libc implementation for WebAssembly

Stars: 1k
Forks: 251
Open beginner issues: 0
Indexed issues: 54
Avg merge: 7h 15m
Merged PRs (30d): 3

Dominant language: C
License: No license data
Last GitHub push: Sep 2, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

Open All

54 open issues indexed

Contradicting `SOL_TCP` and `SOL_UDP` definition for p1 Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

WebAssembly/wasi-libc#855 · 1 comment · Opened Jul 28, 2026
MIT licensing state is unhealthy Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

WebAssembly/wasi-libc#815 · 1 comment · Opened Jul 6, 2026
coop-threads: The open-posix-test-suite conformance tests take a long time to run Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

WebAssembly/wasi-libc#809 · 2 comments · Opened Jun 30, 2026
`PAGESIZE` macro set to garbage value in shared libraries Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

WebAssembly/wasi-libc#778 · 1 comment · 1 reaction · Opened Mar 23, 2026
Enhance testing of nondeterministic host functionality with component composition Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

WebAssembly/wasi-libc#766 · 1 comment · Opened Mar 5, 2026
How should wasi-libc handle `POLLPRI`? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/wasi-libc#760 · 1 comment · Opened Mar 4, 2026
wasi-libc fails to link --target=wasm32-wasip1 with undefined symbol: __muloti4 Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

WebAssembly/wasi-libc#733 · 3 comments · Opened Feb 12, 2026
Calling `pthread_create` with a stack size of 2047 (or at the default) results in an "out of memory" error, but 2048 works Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

WebAssembly/wasi-libc#701 · 2 comments · Opened Dec 25, 2025
Calling fopen for writing ends up calling __isatty which sets errno - is it intended? Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

WebAssembly/wasi-libc#622 · 1 comment · Opened Sep 10, 2025
Possibly support FIONBIO flag in ioctl() for wasip2 sockets Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

WebAssembly/wasi-libc#621 · Opened Sep 5, 2025
check-symbol failure on Nix base toolchain Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

WebAssembly/wasi-libc#619 · 1 comment · Opened Aug 22, 2025
no way for applications to detect pthread in configure time Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

WebAssembly/wasi-libc#607 · 19 comments · Opened Aug 7, 2025
Using SIMD for `string.h` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/wasi-libc#580 · 14 comments · 2 reactions · Opened Apr 18, 2025
Question: Best way to share malloc/free in multiple modules? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/wasi-libc#579 · 2 comments · Opened Apr 7, 2025
polling on mix of libc-posix socket/file descriptors with non-libc WASI pollable handles Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/wasi-libc#542 · 11 comments · Opened Sep 25, 2024
getsockopt, setsockopt doesn't implement SO_RCVTIMEO,SO_SNDTIMEO for wasi:socket handles Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

WebAssembly/wasi-libc#539 · 2 comments · Opened Sep 20, 2024
ioctl doesn't implement FIONREAD for wasi:socket handles Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/wasi-libc#538 · 2 comments · Opened Sep 20, 2024
Keep/separate out a list of symbols that are only stubs Open

help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/wasi-libc#515 · 1 comment · Opened Jul 16, 2024
wasi-libc should probably not define `_POSIX_CPUTIME` and `_POSIX_THREAD_CPUTIME`... Open

WebAssembly/wasi-libc#513 · 1 assignee · Opened Jul 15, 2024
main in a library regression Open

help wanted

Difficulty 4/5 3-5 days Newbie friendliness 45/100

WebAssembly/wasi-libc#485 · 5 comments · 1 reaction · Opened Mar 16, 2024
locking issues in chdir.c Open

threads

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/wasi-libc#474 · Opened Feb 14, 2024
why no dedicated __wasi_snapshot_preview1_fd_openat syscall? Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/wasi-libc#454 · 2 comments · Opened Dec 14, 2023
Should we merge `wasi-libc` into `wasi-sdk`? Open

help wanted

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/wasi-libc#427 · 4 comments · 6 reactions · Opened Jul 11, 2023
`fopen`/`openat` does not seem to preserve access flags Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

WebAssembly/wasi-libc#415 · 12 comments · 1 reaction · Opened May 24, 2023
Directory listings should include preopens Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/wasi-libc#414 · 4 comments · Opened May 17, 2023
pthread should use atomic load/store for access of contended fields Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/wasi-libc#413 · 14 comments · Opened May 17, 2023
Make errno a macro like on other platforms Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/wasi-libc#411 · 5 comments · 2 reactions · Opened Apr 26, 2023
C++, no exceptions, and OOM in `operator new` Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/wasi-libc#406 · 3 comments · Opened Apr 5, 2023
Data race or race condition during exiting/joining a thread Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

WebAssembly/wasi-libc#405 · 7 comments · 1 reaction · Opened Apr 5, 2023
dlmalloc locks seems to be not enabled in pthread builds Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/wasi-libc#393 · 7 comments · Opened Feb 15, 2023
Enable C11 threads on top of pthreads? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/wasi-libc#392 · 4 comments · Opened Feb 8, 2023
wasi-libc fails to build Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/wasi-libc#368 · 12 comments · Opened Dec 20, 2022
dlmalloc has license incompatible with Fedora policies Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/wasi-libc#319 · 12 comments · Opened Aug 29, 2022
Provide socket option definitions Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/wasi-libc#304 · 3 comments · Opened Jul 21, 2022
fd_set implementation is inefficient Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/wasi-libc#283 · 5 comments · Opened Apr 8, 2022
Latest SIMD patch Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/wasi-libc#280 · 2 comments · Opened Mar 27, 2022
A few packaging nits, coming from Nixpkgs/NixOS Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/wasi-libc#269 · 6 comments · 2 reactions · Opened Mar 14, 2022
Remove CLOCK_PROCESS_CPUTIME_ID/CLOCK_THREAD_CPUTIME_ID Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/wasi-libc#266 · 2 comments · Opened Feb 15, 2022
chdir("..") from "/bin" changes the current directory to "/bin/.." instead of "/" Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

WebAssembly/wasi-libc#260 · 2 comments · Opened Oct 10, 2021
Alignment used by dlmalloc is not correct (AFAICT) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/wasi-libc#249 · Opened Jun 23, 2021
Implementing errno with WASI modularization Open

after next snapshot

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/wasi-libc#239 · 2 comments · Opened Mar 16, 2021
Generation user-defined custom section Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/wasi-libc#238 · 2 comments · Opened Mar 13, 2021
Allow mk*temp on WASI Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

WebAssembly/wasi-libc#229 · 18 comments · 6 reactions · Opened Jan 29, 2021
sbrk only works for limited inputs Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/wasi-libc#220 · 1 comment · Opened Oct 8, 2020
memcpy is much larger than Emscripten variant Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/wasi-libc#218 · 2 comments · Opened Sep 30, 2020
Integer overflow in setenv Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

WebAssembly/wasi-libc#213 · Opened Aug 4, 2020
_initialize support Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/wasi-libc#211 · Opened Aug 3, 2020
_WASI_EMULATED_MMAN: mmap does not return aligned memory Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

WebAssembly/wasi-libc#207 · 12 comments · Opened Jul 8, 2020
_WASI_EMULATED_MMAN is doesn't write changes back to the underlying file Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/wasi-libc#206 · 2 comments · Opened Jul 8, 2020
Emulation for `pause` Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/wasi-libc#200 · Opened Jun 1, 2020

WebAssembly/wasi-libc

Get new issues in your inbox