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wasi-libc/libc-bottom-half/README.md
Dan Gohman 753cc4344d
Merge the basics component into libc-bottom-half. (#199) 
We no longer have a need to maintain basics as a separate component.
Folding it into libc-bottom-half eliminates a fair amount of redundancy.
2020-06-01 16:44:05 -07:00

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WASI libc "bottom half".

The WASI libc "bottom half" is conceptually the lower half of a traditional libc implementation, consisting of C interfaces to the low-level WASI syscalls.

This implementation is partially derived from the "bottom half" of cloudlibc, revision 8835639f27fc42d32096d59d294a0bbb857dc368.

This implementation includes preopen functionality, which emulates POSIX APIs accepting absolute paths by translating them into pre-opened directory handles and relative paths that can be opened with openat. This technique is inspired by libpreopen, however the implementation here is designed to be built into libc rather than to be a layer on top of libc.

The WASI libc lower half currently depends on the dlmalloc component.