ability to send arbitrary signals

1 files changed, 19 insertions, 1 deletions

diff --git a/src/dudki.cc b/src/dudki.cc
index e91ad5e..9562079 100644
--- a/src/dudki.cc
+++ b/src/dudki.cc
@@ -1,223 +1,241 @@
 #include <unistd.h>
 #include <signal.h>
 #include <syslog.h>
+#include <errno.h>
 #include <iostream>
 #include <fstream>
 #include <stdexcept>
 using namespace std;
 #include "configuration.h"
 #include "util.h"
 
 #include "config.h"
 #ifdef HAVE_GETOPT_H
 # include <getopt.h>
 #endif
 
 #ifndef DEFAULT_CONF_FILE
 # define DEFAULT_CONF_FILE "/etc/dudki.conf"
 #endif
 
 #define PHEADER PACKAGE " Version " VERSION
 #define PCOPY   "Copyright (c) 2004 Klever Group"
 
 bool finishing = false;
 bool restarting = false;
 static char **_argv = NULL;
 
 static void lethal_signal_handler(int signum) {
     syslog(LOG_NOTICE,"Lethal signal received. Terminating.");
     finishing = true;
 }
 static void sighup_handler(int signum) {
     syslog(LOG_NOTICE,"SUGHUP received, reloading.");
     restarting = finishing = true;
 }
 
 void check_herd(configuration& config) {
     for(processes_t::iterator i=config.processes.begin();i!=config.processes.end();++i)
 	i->second.check(i->first,config);
 }
 
 void signal_self(const configuration& config,int signum) {
     ifstream pids(config.pidfile.c_str(),ios::in);
     if(!pids)
 	throw runtime_error("Can't detect running instance");
     pid_t pid = 0;
     pids >> pid;
     if(!pid)
 	throw runtime_error("Can't detect running instance");
     if(pid==getpid())
 	throw 0;
     if(kill(pid,signum))
 	throw runtime_error("Failed to signal running instance");
 }
 
 int main(int argc,char **argv) {
     try {
 	_argv = new char*[argc+1];
 	if(!_argv)
 	    throw runtime_error("memory allocation problem at the very start");
 	memmove(_argv,argv,sizeof(*_argv)*(argc+1));
 	string config_file = DEFAULT_CONF_FILE;
 	enum {
 	    op_default,
 	    op_work,
 	    op_signal,
 	    op_ensure,
 	    op_test
 	} op = op_default;
 	int op_signum = 0;
 	while(true) {
-#define	SHORTOPTSTRING "f:hVLrkcet"
+#define	SHORTOPTSTRING "f:hVLrkcets:"
 #ifdef HAVE_GETOPT_LONG
 	    static struct option opts[] = {
 		{ "help", no_argument, 0, 'h' },
 		{ "usage", no_argument, 0, 'h' },
 		{ "version", no_argument, 0, 'V' },
 		{ "license", no_argument, 0, 'L' },
 		{ "config", required_argument, 0, 'f' },
 		{ "kill", no_argument, 0, 'k' },
 		{ "reload", no_argument, 0, 'r' },
+		{ "signal", required_argument, 0, 's' },
 		{ "check", no_argument, 0, 'c' },
 		{ "ensure", no_argument, 0, 'e' },
 		{ "test", no_argument, 0, 't' },
 		{ NULL, 0, 0, 0 }
 	    };
 	    int c = getopt_long(argc,argv,SHORTOPTSTRING,opts,NULL);
 #else /* !HAVE_GETOPT_LONG */
 	    int c = getopt(argc,argv,SHORTOPTSTRING);
 #endif /* /HAVE_GETOPT_LONG */
 	    if(c==-1)
 		break;
 	    switch(c) {
 		case 'h':
 		    cerr << PHEADER << endl
 			<< PCOPY << endl << endl
 			<< " " << argv[0] << " [options] [processes]" << endl << endl <<
 #ifdef HAVE_GETOPT_LONG
 			" -h, --help\n"
 			" --usage         display this text\n"
 			" -V, --version   display version number\n"
 			" -L, --license   show license\n"
 			" -f filename, --config=filename\n"
 			"                 specify the configuration file to use\n"
 			"\n"
 			" -k, --kill      stop running instance (send SIGTERM)\n"
 			" -r, --reload    reload running instance (send SIGHUP)\n"
+			" -s signum, --signal=signum\n"
+			"                 send the specified signal to the running process\n"
 			" -c, --check     check if the process is running\n"
 			"     (the above commands operate on dudki itself if no\n"
 			"      process name has been specified)\n"
 			" -e, --ensure    ensure that dudki is running\n"
 			" -t, --test      test configuration file and exit"
 #else /* !HAVE_GETOPT_LONG */
 			" -h              display this text\n"
 			" -V              display version number\n"
 			" -L              show license\n"
 			" -f filename     specify the configuration file to use\n"
 			"\n"
 			" -k              stop running instance (send SIGTERM)\n"
 			" -r              reload running instance (send SIGHUP)\n"
+			" -s signum       send the specified signal to the running process\n"
 			" -c              check if the process is running\n"
 			"     (the above commands operate on dudki itself if no\n"
 			"      process name has been specified)\n"
 			" -e              ensure that dudki is running\n"
 			" -t              test configuration file and exit"
 #endif /* /HAVE_GETOPT_LONG */
 			<< endl;
 		    exit(0);
 		    break;
 		case 'V':
 		    cerr << VERSION << endl;
 		    exit(0);
 		    break;
 		case 'L':
 		    extern const char *COPYING;
 		    cerr << COPYING << endl;
 		    exit(0);
 		    break;
 		case 'f':
 		    config_file = optarg;
 		    break;
 		case 'k':
 		    if(op!=op_default) {
 			cerr << "Can't obey two or more orders at once" << endl;
 			exit(1);
 		    }
 		    op = op_signal; op_signum = SIGTERM;
 		    break;
 		case 'r':
 		    if(op!=op_default) {
 			cerr << "Can't obey two or more orders at once" << endl;
 			exit(1);
 		    }
 		    op = op_signal; op_signum = SIGHUP;
 		    break;
 		case 'c':
 		    if(op!=op_default) {
 			cerr << "Can't obey two or more orders at once" << endl;
 			exit(1);
 		    }
 		    op = op_signal; op_signum = 0;
 		    break;
 		case 'e':
 		    if(op!=op_default) {
 			cerr << "Can't obey two or more orders at once" << endl;
 			exit(1);
 		    }
 		    op = op_ensure;
 		    break;
 		case 't':
 		    if(op!=op_default) {
 			cerr << "Can't obey two or more orders at once" << endl;
 			exit(1);
 		    }
 		    op = op_test;
 		    break;
+		case 's':
+		    if(op!=op_default) {
+			cerr << "Can't obey two or more orders at once" << endl;
+			exit(1);
+		    }
+		    op = op_signal;
+		    errno = 0;
+		    op_signum = strtol(optarg,NULL,0);
+		    if(errno) {
+			cerr << "Can't obtain the signal value" << endl;
+			exit(1);
+		    }
+		    break;
 		default:
 		    cerr << "Huh??" << endl;
 		    exit(1);
 		    break;
 	    }
 	}
 	const char *sid = *argv;
 	const char *t;
 	while(t = index(sid,'/')) {
 	    sid = t; sid++;
 	}
 	openlog(sid,LOG_CONS|LOG_PERROR|LOG_PID,LOG_DAEMON);
 	configuration config;
 	config.parse(config_file);
 	switch(op) {
 	    case op_test:
 		cerr << "Configuration OK" << endl;
 		break;
 	    case op_signal:
 		try {
 		    if(optind>=argc) {
 			signal_self(config,op_signum);
 		    }else{
 			int failures = 0;
 			for(int narg=optind;narg<argc;narg++) {
 			    try {
 				processes_t::const_iterator i = config.processes.find(argv[narg]);
 				if(i==config.processes.end())
 				    throw runtime_error("no such process configured");
 				i->second.signal(op_signum);
 			    }catch(exception& e) {
 				cerr << "dudki(" << argv[narg] << "): " << e.what() << endl;
 				failures++;
 			    }
 			}
 			if(failures)
 			    throw runtime_error("not all processes have been successfully signaled");
 		    }
 		    if(!op_signum)
 			exit(0);
 		}catch(exception& e) {
 		    if(!op_signum)
 			exit(1);
 		}
 	    case op_ensure:
 		try {
 		    signal_self(config,0);
 		    break;