posish provides safe wrappers to POSIX-ish libc APIs.
posish is focused on functionality that isn't already provided by std
or getrandom. It has a philosophy of considering raw file descriptors to be
equivalent to pointers in terms of making APIs unsafe, in the spirit of
std::os::unix::io::FromRawFd::from_raw_fd being unsafe.
posish is relatively low-level and does not support Windows; for higher-level
and portable APIs to this functionality, see the system-interface and
cap-std crates.