After decades of gleefully using signal handlers to handle all sorts of contingencies, systems programmers were solemnly informed that signal handler functions were very dangerous indeed, because a bunch of other stuff was on the stack and undefined while they were being run, and therefore, handler functions couldn't call anything that was unsafe or non-reentrant.
Systems programmers were told that the best signal handler function was one that set a flag, a volatile int, and then exited immediately without doing or touching anything else.
Sort of defeats the purpose of the elaborate signal-handler-callback-pointer-to-function system we had in place, but them's the breaks.
Systems programmers were told that the best signal handler function was one that set a flag, a volatile int, and then exited immediately without doing or touching anything else.
Sort of defeats the purpose of the elaborate signal-handler-callback-pointer-to-function system we had in place, but them's the breaks.