This project seems to be relying on linux specific libc calls

[zaphar]

None of the docs indicate that this is a linux only project but it appears to be using linux specific libc functions. When attempting to build on MacOS you get the following error:

error: could not compile `forksrv` (lib) due to 2 previous errors
error[E0432]: unresolved import `nix::libc::__errno_location`
  --> forksrv/src/lib.rs:18:5
   |
18 |     __errno_location, shmat, shmctl, shmget, strerror, IPC_CREAT, IPC_EXCL, IPC_PRIVATE, IPC_RMID,
   |     ^^^^^^^^^^^^^^^^ no `__errno_location` in the root


error: aborting due to 1 previous error


For more information about this error, try `rustc --explain E0432`.

This may be intentional in which case adding a note in the Readme mentioning that it is Linux only would be helpful. If not I have a use for this on MacOS and depending on how my time shakes out I might be able to put see if I can put together a PR to make it work on Mac machines. Perhaps behind a feature flag?