For the signals that you must handle with a handler (SIGSEGV etc.), Rust doesn't help you. Your code must be "async-signal-safe", that is, everything must work correctly despite being called between two arbitrary opcodes in the host program. Importantly, this means anything that allocates is impermissible, since you might be in the middle of an allocation, and your allocator almost certainly has a per-thread lock and doesn't expect to be called reentrantly on the same thread. And there's no compile-time tracking (e.g., no function type) for functions that don't allocate. You also might be called in the middle of an unsafe block modifying global data, etc.

I've considered designing some sort of complicated DSL in Rust to construct async-signal-safe handlers, but it didn't seem worth the complexity. (Although, now that I write this comment out, I think you can handle SIGSEGV safely from another thread as long as your first thread calls for help in an async-signal-safe way, so maybe that would be a library worth writing.)

For the rest, using sigwaitinfo or signalfd works just as well in Rust as in C/C++, but not really better or worse. There aren't any good libraries for it (which I keep meaning to do something about), but the underlying POSIX APIs are usable equally well in all three languages.

As for whether you should worry about it? Try not to use signals, regardless of language. If you're writing some sort of demand-paging system using SIGSEGV handlers, I hope you know what you're doing already. If you're thinking about SIGALRM, there are other ways to get a notification after a fixed time (and Rust's mio/tokio, for instance, gets you timers in your event loop). If you're trying to use SIGUSR1/SIGUSR2, please rethink your design - you'll be much happier with something like a UNIX socket listening for connections or a localhost-only URL for debugging or whatever. If you want to handle SIGINT (intercept Ctrl-C at a terminal), SIGQUIT (intercept Ctrl-\ at a terminal), SIGTSTP (intercept Ctrl-Z at a terminal), SIGTERM (intercept the "kill" command's default signal), SIGHUP (do something when the terminal exits), SIGWINCH (get notified when the terminal resizes), or SIGCHLD (get notified when a child process exits), you do have to use signals, but all of these can be run through sigwaitinfo or signalfd. And you don't have to actively worry about them if you don't want to customize their behavior, or if (for SIGINT, SIGHUP, etc.) you just want to ignore them and not do anything special.

The only odd case is SIGPIPE, and Rust's standard library blocks SIGPIPE for you and returns EPIPE from a system call instead, and unblocks it in child processes, so you don't need to worry about it. (The default SIGPIPE behavior is basically legacy compatibility with existing C code from the very early days of UNIX.)