Calling exit() from a signal handler is unsafe

[bnoordhuis]

Alternatives:

1. Call _exit(). Disadvantage: doesn't run atexit() cleanup handlers.
2. Write-to-pipe trick. Disadvantage: signals may get lost if the pipe is full.
3. Use a libev signal watcher. Disadvantage: lots of work to rewrite existing code?

By the way, libev uses the pipe trick on platforms other than linux so it too might miss signals.

[ry]

fixed in 711196c

[Fishrock123]

@bnoordhuis could you clarify "unsafe"? I'm left wondering why this doesn't happen years later haha.

[bnoordhuis]

@Fishrock123 exit() (unlike _exit()) runs atexit handlers and flushes stdio, leading to all kinds of memory corruption and deadlocks when the signal arrives at the wrong time.