# See the License for the specific language governing permissions and
# limitations under the License.
-# Module to manage standard C signals
+# ANSI C signal handling
#
# Common usage imply 5 steps:
#
#define _POSIX_SOURCE 1
#include <signal.h>
#include <stdio.h>
+ #include <unistd.h>
/*
*/
char raised; /* !=0 if has been raised */
void* handler; /* instance to receive call */
char safely; /* if !=0 then manage signal safely, otherwise react when raised */
- } nit_signals_list[32] = {0x0};
+ } nit_signals_list[32] = {{0}};
/* Receiver to all signals
If unsafe, it calls directly the Nit receiver,
#
# class MyReceiver
# super SignalHandler
- #
+ #
# redef fun receive_signal(signal) do print "received safely {signal}"
# end
- #
+ #
# var r = new MyReceiver
# r.handle_signal(sigint, true) # will call back when "check_signals" is called
# # ...
#
# class MyReceiver
# super SignalHandler
- #
+ #
# redef fun receive_signal_unsafe(signal) do print "received unsafely {signal}"
# end
- #
+ #
# var r = new MyReceiver
# r.handle_signal(sigsegv, false) # `r.receive_signal_unsafe` will be invoked on sigsegv
fun receive_signal_unsafe(signal: Int) do end
# If `safely`, receiver will be called when `check_signals` in invoked
# otherwise the receiver is invoked when the signal is raised, it may
# crash the Nit system but is unavoidable for unstoppable signals.
- fun handle_signal(signal: Int, safely: Bool) import
- receive_signal `{
- SignalHandler last_handler;
+ fun handle_signal(signal: Int, safely: Bool) import receive_signal `{
if (signal < 32 && signal >=0) {
struct sigaction act;
sigemptyset(&act.sa_mask);
sigaction(signal, &act, NULL);
- last_handler = (SignalHandler)nit_signals_list[signal].handler;
+ #ifdef SignalHandler_decr_ref
+ SignalHandler last_handler = (SignalHandler)nit_signals_list[signal].handler;
if (last_handler != NULL)
SignalHandler_decr_ref(last_handler);
+ #endif
nit_signals_list[signal].handler = self;
+
+ #ifdef SignalHandler_incr_ref
SignalHandler_incr_ref(self);
+ #endif
nit_signals_list[signal].safely = safely;
+
nit_SignalHandler_receive_signal = SignalHandler_receive_signal;
}
`}
# Set to ignore the signal
fun ignore_signal(signal: Int) `{
- SignalHandler last_handler;
if (signal < 32 && signal >=0) {
struct sigaction act;
sigemptyset(&act.sa_mask);
act.sa_handler = SIG_IGN;
sigaction(signal, &act, NULL);
- last_handler = (SignalHandler)nit_signals_list[signal].handler;
+ #ifdef SignalHandler_decr_ref
+ SignalHandler last_handler = (SignalHandler)nit_signals_list[signal].handler;
if (last_handler != NULL)
SignalHandler_decr_ref(last_handler);
+ #endif
}
`}
# Set default action for the signal
fun default_signal(signal: Int) `{
- SignalHandler last_handler;
if (signal < 32 && signal >=0) {
struct sigaction act;
sigemptyset(&act.sa_mask);
act.sa_handler = SIG_DFL;
sigaction(signal, &act, NULL);
- last_handler = (SignalHandler)nit_signals_list[signal].handler;
+ #ifdef SignalHandler_decr_ref
+ SignalHandler last_handler = (SignalHandler)nit_signals_list[signal].handler;
if (last_handler != NULL)
SignalHandler_decr_ref(last_handler);
+ #endif
}
`}
end
# Send the kill signal to the process
fun kill do signal(sigkill)
-
+
# Native implementation of `signal`
private fun native_kill(pid, signal: Int) `{ kill(pid, signal); `}
end
# Profiling timer expired
fun sigprof: Int do return 27
-# Sent to a process when its controlling terminal changes its window size
+# Sent to a process when its controlling terminal changes its window size
fun sigwinch: Int do return 28
# Sent to a process when the system experiences a power failure