1 -----------------------------------------------------------------------------
3 -- Module : System.Posix.Signals
4 -- Copyright : (c) The University of Glasgow 2002
5 -- License : BSD-style (see the file libraries/base/LICENSE)
7 -- Maintainer : libraries@haskell.org
8 -- Stability : provisional
9 -- Portability : non-portable (requires POSIX)
11 -- POSIX signal support
13 -----------------------------------------------------------------------------
17 module System.Posix.Signals (
18 #ifndef mingw32_TARGET_OS
24 internalAbort, sigABRT,
25 realTimeAlarm, sigALRM,
27 processStatusChanged, sigCHLD,
28 continueProcess, sigCONT,
29 floatingPointException, sigFPE,
30 lostConnection, sigHUP,
31 illegalInstruction, sigILL,
32 keyboardSignal, sigINT,
34 openEndedPipe, sigPIPE,
35 keyboardTermination, sigQUIT,
36 segmentationViolation, sigSEGV,
37 softwareStop, sigSTOP,
38 softwareTermination, sigTERM,
39 keyboardStop, sigTSTP,
40 backgroundRead, sigTTIN,
41 backgroundWrite, sigTTOU,
42 userDefinedSignal1, sigUSR1,
43 userDefinedSignal2, sigUSR2,
45 pollableEvent, sigPOLL,
47 profilingTimerExpired, sigPROF,
48 badSystemCall, sigSYS,
49 breakpointTrap, sigTRAP,
50 urgentDataAvailable, sigURG,
51 virtualTimerExpired, sigVTALRM,
52 cpuTimeLimitExceeded, sigXCPU,
53 fileSizeLimitExceeded, sigXFSZ,
66 emptySignalSet, fullSignalSet,
67 addSignal, deleteSignal, inSignalSet,
69 -- * The process signal mask
70 getSignalMask, setSignalMask, blockSignals, unblockSignals,
75 -- * Waiting for signals
76 getPendingSignals, awaitSignal,
78 -- MISSING FUNCTIONALITY:
79 -- sigaction(), (inc. the sigaction structure + flags etc.)
80 -- the siginfo structure
82 -- sighold, sigignore, sigpause, sigrelse, sigset
91 import System.IO.Unsafe
92 import System.Posix.Types
95 #ifndef mingw32_TARGET_OS
98 -- -----------------------------------------------------------------------------
106 foreign import ccall "__hsposix_SIGABRT" sigABRT :: CInt
107 foreign import ccall "__hsposix_SIGALRM" sigALRM :: CInt
108 foreign import ccall "__hsposix_SIGBUS" sigBUS :: CInt
109 foreign import ccall "__hsposix_SIGCHLD" sigCHLD :: CInt
110 foreign import ccall "__hsposix_SIGCONT" sigCONT :: CInt
111 foreign import ccall "__hsposix_SIGFPE" sigFPE :: CInt
112 foreign import ccall "__hsposix_SIGHUP" sigHUP :: CInt
113 foreign import ccall "__hsposix_SIGILL" sigILL :: CInt
114 foreign import ccall "__hsposix_SIGINT" sigINT :: CInt
115 foreign import ccall "__hsposix_SIGKILL" sigKILL :: CInt
116 foreign import ccall "__hsposix_SIGPIPE" sigPIPE :: CInt
117 foreign import ccall "__hsposix_SIGQUIT" sigQUIT :: CInt
118 foreign import ccall "__hsposix_SIGSEGV" sigSEGV :: CInt
119 foreign import ccall "__hsposix_SIGSTOP" sigSTOP :: CInt
120 foreign import ccall "__hsposix_SIGTERM" sigTERM :: CInt
121 foreign import ccall "__hsposix_SIGTSTP" sigTSTP :: CInt
122 foreign import ccall "__hsposix_SIGTTIN" sigTTIN :: CInt
123 foreign import ccall "__hsposix_SIGTTOU" sigTTOU :: CInt
124 foreign import ccall "__hsposix_SIGUSR1" sigUSR1 :: CInt
125 foreign import ccall "__hsposix_SIGUSR2" sigUSR2 :: CInt
127 foreign import ccall "__hsposix_SIGPOLL" sigPOLL :: CInt
129 foreign import ccall "__hsposix_SIGPROF" sigPROF :: CInt
130 foreign import ccall "__hsposix_SIGSYS" sigSYS :: CInt
131 foreign import ccall "__hsposix_SIGTRAP" sigTRAP :: CInt
132 foreign import ccall "__hsposix_SIGURG" sigURG :: CInt
133 foreign import ccall "__hsposix_SIGVTALRM" sigVTALRM :: CInt
134 foreign import ccall "__hsposix_SIGXCPU" sigXCPU :: CInt
135 foreign import ccall "__hsposix_SIGXFSZ" sigXFSZ :: CInt
137 internalAbort ::Signal
138 internalAbort = sigABRT
140 realTimeAlarm :: Signal
141 realTimeAlarm = sigALRM
146 processStatusChanged :: Signal
147 processStatusChanged = sigCHLD
149 #ifndef cygwin32_TARGET_OS
150 continueProcess :: Signal
151 continueProcess = sigCONT
154 floatingPointException :: Signal
155 floatingPointException = sigFPE
157 lostConnection :: Signal
158 lostConnection = sigHUP
160 illegalInstruction :: Signal
161 illegalInstruction = sigILL
163 keyboardSignal :: Signal
164 keyboardSignal = sigINT
166 killProcess :: Signal
167 killProcess = sigKILL
169 openEndedPipe :: Signal
170 openEndedPipe = sigPIPE
172 keyboardTermination :: Signal
173 keyboardTermination = sigQUIT
175 segmentationViolation :: Signal
176 segmentationViolation = sigSEGV
178 softwareStop :: Signal
179 softwareStop = sigSTOP
181 softwareTermination :: Signal
182 softwareTermination = sigTERM
184 keyboardStop :: Signal
185 keyboardStop = sigTSTP
187 backgroundRead :: Signal
188 backgroundRead = sigTTIN
190 backgroundWrite :: Signal
191 backgroundWrite = sigTTOU
193 userDefinedSignal1 :: Signal
194 userDefinedSignal1 = sigUSR1
196 userDefinedSignal2 :: Signal
197 userDefinedSignal2 = sigUSR2
200 pollableEvent :: Signal
201 pollableEvent = sigPOLL
204 profilingTimerExpired :: Signal
205 profilingTimerExpired = sigPROF
207 badSystemCall :: Signal
208 badSystemCall = sigSYS
210 breakpointTrap :: Signal
211 breakpointTrap = sigTRAP
213 urgentDataAvailable :: Signal
214 urgentDataAvailable = sigURG
216 virtualTimerExpired :: Signal
217 virtualTimerExpired = sigVTALRM
219 cpuTimeLimitExceeded :: Signal
220 cpuTimeLimitExceeded = sigXCPU
222 fileSizeLimitExceeded :: Signal
223 fileSizeLimitExceeded = sigXFSZ
225 -- -----------------------------------------------------------------------------
226 -- Signal-related functions
228 signalProcess :: Signal -> ProcessID -> IO ()
229 signalProcess sig pid
230 = throwErrnoIfMinus1_ "signalProcess" (c_kill (fromIntegral pid) sig)
232 foreign import ccall unsafe "kill"
233 c_kill :: CPid -> CInt -> IO CInt
235 signalProcessGroup :: Signal -> ProcessGroupID -> IO ()
236 signalProcessGroup sig pgid
237 = throwErrnoIfMinus1_ "signalProcessGroup" (c_killpg (fromIntegral pgid) sig)
239 foreign import ccall unsafe "killpg"
240 c_killpg :: CPid -> CInt -> IO CInt
242 raiseSignal :: Signal -> IO ()
243 raiseSignal sig = throwErrnoIfMinus1_ "raiseSignal" (c_raise sig)
245 foreign import ccall unsafe "raise"
246 c_raise :: CInt -> IO CInt
248 data Handler = Default
254 installHandler :: Signal
256 -> Maybe SignalSet -- other signals to block
257 -> IO Handler -- old handler
259 #ifdef __PARALLEL_HASKELL__
261 error "installHandler: not available for Parallel Haskell"
264 installHandler int handler maybe_mask = do
266 Nothing -> install' nullPtr
267 Just (SignalSet x) -> withForeignPtr x $ install'
272 rc <- case handler of
273 Default -> stg_sig_install int (#const STG_SIG_DFL) p_sp mask
274 Ignore -> stg_sig_install int (#const STG_SIG_IGN) p_sp mask
275 Catch m -> install'' m p_sp mask int (#const STG_SIG_HAN)
276 CatchOnce m -> install'' m p_sp mask int (#const STG_SIG_RST)
279 (#const STG_SIG_DFL) -> return Default
280 (#const STG_SIG_IGN) -> return Ignore
281 (#const STG_SIG_ERR) -> throwErrno "installHandler"
282 (#const STG_SIG_HAN) -> do
284 m <- deRefStablePtr osptr
287 install'' m p_sp mask int reset = do
288 sptr <- newStablePtr m
290 stg_sig_install int reset p_sp mask
292 foreign import ccall unsafe
293 stg_sig_install :: CInt -> CInt -> Ptr (StablePtr (IO ())) -> Ptr CSigset
296 #endif // !__PARALLEL_HASKELL__
298 -- -----------------------------------------------------------------------------
301 scheduleAlarm :: Int -> IO Int
302 scheduleAlarm secs = do
303 r <- c_alarm (fromIntegral secs)
304 return (fromIntegral r)
306 foreign import ccall unsafe "alarm"
307 c_alarm :: CUInt -> IO CUInt
309 -- -----------------------------------------------------------------------------
310 -- Manipulating signal sets
312 newtype SignalSet = SignalSet (ForeignPtr CSigset)
314 emptySignalSet :: SignalSet
315 emptySignalSet = unsafePerformIO $ do
316 fp <- mallocForeignPtrBytes sizeof_sigset_t
317 throwErrnoIfMinus1_ "emptySignalSet" (withForeignPtr fp $ c_sigemptyset)
318 return (SignalSet fp)
320 fullSignalSet :: SignalSet
321 fullSignalSet = unsafePerformIO $ do
322 fp <- mallocForeignPtrBytes sizeof_sigset_t
323 throwErrnoIfMinus1_ "fullSignalSet" (withForeignPtr fp $ c_sigfillset)
324 return (SignalSet fp)
326 infixr `addSignal`, `deleteSignal`
327 addSignal :: Signal -> SignalSet -> SignalSet
328 addSignal sig (SignalSet fp1) = unsafePerformIO $ do
329 fp2 <- mallocForeignPtrBytes sizeof_sigset_t
330 withForeignPtr fp1 $ \p1 ->
331 withForeignPtr fp2 $ \p2 -> do
332 copyBytes p2 p1 sizeof_sigset_t
333 throwErrnoIfMinus1_ "addSignal" (c_sigaddset p2 sig)
334 return (SignalSet fp2)
336 deleteSignal :: Signal -> SignalSet -> SignalSet
337 deleteSignal sig (SignalSet fp1) = unsafePerformIO $ do
338 fp2 <- mallocForeignPtrBytes sizeof_sigset_t
339 withForeignPtr fp1 $ \p1 ->
340 withForeignPtr fp2 $ \p2 -> do
341 copyBytes p2 p1 sizeof_sigset_t
342 throwErrnoIfMinus1_ "deleteSignal" (c_sigdelset p2 sig)
343 return (SignalSet fp2)
345 inSignalSet :: Signal -> SignalSet -> Bool
346 inSignalSet sig (SignalSet fp) = unsafePerformIO $
347 withForeignPtr fp $ \p -> do
348 r <- throwErrnoIfMinus1 "inSignalSet" (c_sigismember p sig)
351 getSignalMask :: IO SignalSet
353 fp <- mallocForeignPtrBytes sizeof_sigset_t
354 withForeignPtr fp $ \p ->
355 throwErrnoIfMinus1_ "getSignalMask" (c_sigprocmask 0 p nullPtr)
356 return (SignalSet fp)
358 sigProcMask :: String -> CInt -> SignalSet -> IO ()
359 sigProcMask fn how (SignalSet set) =
360 withForeignPtr set $ \p_set ->
361 throwErrnoIfMinus1_ fn (c_sigprocmask how p_set nullPtr)
363 setSignalMask :: SignalSet -> IO ()
364 setSignalMask set = sigProcMask "setSignalMask" c_SIG_SETMASK set
366 blockSignals :: SignalSet -> IO ()
367 blockSignals set = sigProcMask "blockSignals" c_SIG_BLOCK set
369 unblockSignals :: SignalSet -> IO ()
370 unblockSignals set = sigProcMask "unblockSignals" c_SIG_UNBLOCK set
372 getPendingSignals :: IO SignalSet
373 getPendingSignals = do
374 fp <- mallocForeignPtrBytes sizeof_sigset_t
375 withForeignPtr fp $ \p ->
376 throwErrnoIfMinus1_ "getPendingSignals" (c_sigpending p)
377 return (SignalSet fp)
379 #ifndef cygwin32_TARGET_OS
380 awaitSignal :: Maybe SignalSet -> IO ()
381 awaitSignal maybe_sigset = do
382 fp <- case maybe_sigset of
383 Nothing -> do SignalSet fp <- getSignalMask; return fp
384 Just (SignalSet fp) -> return fp
385 withForeignPtr fp $ \p -> do
388 -- ignore the return value; according to the docs it can only ever be
389 -- (-1) with errno set to EINTR.
391 foreign import ccall unsafe "sigsuspend"
392 c_sigsuspend :: Ptr CSigset -> IO CInt
395 foreign import ccall unsafe "__hscore_sigdelset"
396 c_sigdelset :: Ptr CSigset -> CInt -> IO CInt
398 foreign import ccall unsafe "__hscore_sigfillset"
399 c_sigfillset :: Ptr CSigset -> IO CInt
401 foreign import ccall unsafe "__hscore_sigismember"
402 c_sigismember :: Ptr CSigset -> CInt -> IO CInt
404 foreign import ccall unsafe "sigpending"
405 c_sigpending :: Ptr CSigset -> IO CInt
407 foreign import ccall unsafe "__hsposix_SIG_BLOCK" c_SIG_BLOCK :: CInt
408 foreign import ccall unsafe "__hsposix_SIG_SETMASK" c_SIG_SETMASK :: CInt
409 foreign import ccall unsafe "__hsposix_SIG_UNBLOCK" c_SIG_UNBLOCK :: CInt
411 #endif /* mingw32_TARGET_OS */