> -----Original Message----- > From: gcc-help-owner@xxxxxxxxxxx <gcc-help-owner@xxxxxxxxxxx> On > Behalf Of Didier Kryn > Sent: Wednesday, October 9, 2019 4:36 AM > To: gcc-help@xxxxxxxxxxx > Subject: Re: Ada and signal handling > > Le 07/10/2019 à 18:06, Kacvinsky, Tom a écrit : > > I am using GCC 8.3.0 with the Ada tool chain, but cannot seem to find > > a way of unsetting the signal handlers the Ada run time inserts. I do > > not want Ada to handle signals for me as I am in a missed C/C++/Ada > > code base and would prefer to have the C signal handlers used. > > > > Any ideas? > > > > Thanks, > > > > Tom > > Hello Tom. > > I subscribed to this list (and gcc) primarily to get help from Gnat people but > never received any reply. I'm sure they don't read this list and I don't know > how to reach them. > > I've no authority to reply on this list. I've just been a user of Ada and > managed sometimes to play with signals. > > Ada's API for signals is the package Ada.Interrupts (see > /usr/lib/gcc/x86_64-linux-gnu/6/adainclude/a-interr.ads or the like > depending on the arch and version of gcc). You will see that Ada provisions > the possibility for the runtime to reserve some signals - ie prevent user's > action on these. > > More details can be found in lower level packages like > System.Interrupt_Management (s-intman.ads and s-intman.adb) in which > you can see which signals are reserved by Gnat's runtime library. > > The usual system-raised signals are mapped as follows: > > case signo is > when SIGFPE => > raise Constraint_Error; > when SIGILL => > raise Program_Error; > when SIGSEGV => > raise Storage_Error; > when SIGBUS => > raise Storage_Error; > when others => > null; > end case; > > Gnat reserves yet another signal to abort tasks. > > SIGINT is also reserved although there must be a way to avoid it, but I > don't remember how. > > I've mixed a lot Ada and C to call the C library to invoke IOCTL's, perform > memory mapping and manipulate pipes, but never with C++. > > Only two possible situations make sense in my opinion: either your > application is in Ada and you want to interface it with some C++ library, or > your application is in C++ and you want to interface it to an Ada library. > > Question: is your main program in Ada or in C++? Hi Didier, Our main programs are C++. I "cheated" - after calling adainit() in C++ code, which sets up the Ada signal handlers, I called signal() to restore the default signal handlers. Problem solved. Tom
