Attachment 830787 Details for Bug 1036241 – program that can be used to display blocked signals or wait for signals

program that can be used to display blocked signals or wait for signals

signal_catcher.cc (text/x-c++src), 1.88 KB, created by Alexander Murashkin on 2013-11-29 23:45:02 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Alexander Murashkin

Created: 2013-11-29 23:45:02 UTC

Size: 1.88 KB

patch

obsolete

>#include <sys/types.h>
>#include <unistd.h>
>#include <csignal>
>#include <cstdlib>
>
>#include <cerrno>
>#include <string>
>#include <iostream>
>
>using namespace std;
>
>#define X(c) if ( (c) != 0 ) { clog << #c " failed, errno " << errno << endl; }
>
>void handler( int sig ) {
>
>	clog << "\nGot signal " << sig << endl;
>	exit(EXIT_SUCCESS);
>}
>
>void printSigprocmask( const string& comment ) {
>
>	sigset_t sigs;
>        X(sigprocmask(0,NULL,&sigs));
>
>	bool empty=true;
>        clog << comment << " sigprocmask ";
>        for ( int i=1; i<SIGRTMIN; ++i ) {
>                if ( sigismember(&sigs,i) ) { clog << " " << i; empty = false; }
>        }
>	if ( empty ) clog << " empty";
>        clog << endl;
>
>}
>
>int main( int argc, char* argv[] ) {
>
>	bool do_list = false, do_wait = false, do_adjust = false, do_sigact = false;
>
>	for ( int i=1; i<argc; ++i ) {
>
>		if 	( string("-w") == argv[i] ) do_wait    = true;
>		else if ( string("-l") == argv[i] ) do_list    = true; 	
>		else if ( string("-u") == argv[i] ) do_adjust  = true; 	
>		else if ( string("-i") == argv[i] ) do_sigact  = true; 	
>	}
>
>	if ( !do_wait && !do_list && !do_adjust && !do_sigact ) do_list = true;
>
>	printSigprocmask("inherited");
>
>	if ( do_sigact ) {
>
>		struct sigaction act;
>
>        	act.sa_handler = handler;
>        	//act.sa_sigaction = NULL;
>        	act.sa_flags = 0;
>        	sigemptyset(&act.sa_mask);
>
>		X(sigaction(SIGINT,&act,NULL));
>		X(sigaction(SIGHUP,&act,NULL));
>		X(sigaction(SIGUSR1,&act,NULL));
>
>		printSigprocmask("  working");
>	}
>
>	if ( do_adjust ) {
>
>	        sigset_t sign;
>        	sigemptyset     ( &sign );
>        	sigaddset       ( &sign, SIGINT );
>        	sigaddset       ( &sign, SIGHUP );
>        	sigaddset       ( &sign, SIGUSR1 );
>        	sigprocmask     ( SIG_UNBLOCK, &sign, 0 );
>
>        	printSigprocmask("adjusted");
>	}
>
>	if ( do_wait ) {
>
>		clog << "Process " << getpid() << " is waiting for a signal" << endl;
>		sleep(1000);
>	}
>}
>
>
>

Actions: View

Attachments on bug 1036241: 830787