and Linux/GNU-specific APIs, we generally prefer the POSIX APIs. If there
aren't, we are happy to use GNU or Linux APIs, and expect non-GNU
implementations of libc to catch up with glibc.
+
+- Whenever installing a signal handler, make sure to set SA_RESTART for it, so
+ that interrupted system calls are automatically restarted, and we minimize
+ hassles with handling EINTR (in particular as EINTR handling is pretty broken
+ on Linux).