On Tue, Jan 08, 2002 at 12:15:27AM +1100, Robert Collins wrote: >Ok. >I didn't realise that signal() is implemented in the standard VC++ >libraries. >Can you tell me any details of the signal implementation you are using >on win32? >If you wished to follow clean room r/e for this, I can implement the >signal sending side to match up with what your library expects. > >Also, according to >http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore9 >8/HTML/_crt_signal.asp > > >SIGINT is not supported for win32 programs. I quote: >"Note SIGINT is not supported for any Win32 application including >Windows NT and Windows 95. When a CTRL+C interrupt occurs, Win32 >operating systems generate a new thread to specifically handle that >interrupt. This can cause a single-thread application such as UNIX, to >become multithreaded, resulting in unexpected behavior. " > >As for why you see the current behaviour, I'm a little mystified. > >Here's why: > >Firstly, here's a snippet of the output of a strace of kill -2 ><signals.exe pid> > > 2149 2816627 [main] kill 920 _kill: kill (3656, 2) > 1542 2818169 [main] kill 920 sig_send: pid 3656, signal 2, its_me 0 > 1387 2819556 [main] kill 920 getsem: pid 3656, ppid 3648, wait 1000, >initializing 0 > 1776 2821332 [main] kill 920 sig_send: Not waiting for sigcomplete. >its_me 0 signal 2 > 3817 2825149 [main] kill 920 sig_send: returning 0 from sending signal >2 > 2529 2827678 [main] kill 920 kill_worker: 0 = kill_worker (3656, 2) > >The getsem line is whats interesting: This is retrieving the semaphore >used to syncronise the signalling across process's. > >It succeeds! (I'm running a slightly modified cygwin here, which as the >patch at the end of this email shows (in combination with the source :}) >should always indicate if there is an error).
It should always succeed. A non-cygwin app should have a cygwin stub associated with it. cgf -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
