79601cec33
Closes #161461 - This is my first time contributing to libc's POSIX, so for reference I used `clock_gettime` implementation for Linux. For convenience, here is the description of `clock_settime` function [behavior](https://www.man7.org/linux/man-pages/man3/clock_settime.3.html)
libc Documentation ================== The libc documentation is written using the Sphinx documentation generator. It is currently tested with Sphinx 1.1.3. To build the documents into html configure libc with the following cmake options: * -DLLVM_ENABLE_SPHINX=ON * -DLIBC_INCLUDE_DOCS=ON After configuring libc with these options the make rule `docs-libc-html` should be available.