libc-bottom-half/README.md

   1 # WASI libc "bottom half".
   2
   3 The WASI libc "bottom half" is conceptually the lower half of a traditional libc
   4 implementation, consisting of C interfaces to the low-level WASI syscalls.
   5
   6 This implementation is partially derived from the "bottom half" of [cloudlibc],
   7 revision 8835639f27fc42d32096d59d294a0bbb857dc368.
   8
   9 [cloudlibc]: https://github.com/NuxiNL/cloudlibc
  10
  11 This implementation includes preopen functionality, which emulates POSIX APIs
  12 accepting absolute paths by translating them into pre-opened directory handles
  13 and relative paths that can be opened with `openat`. This technique is inspired
  14 by [libpreopen], however the implementation here is designed to be built into
  15 libc rather than to be a layer on top of libc.
  16
  17 [libpreopen]: https://github.com/musec/libpreopen
  18
  19 The WASI libc lower half currently depends on the dlmalloc component.