| -rw-r--r-- | src/dudki.cc | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/dudki.cc b/src/dudki.cc index 91a3342..1f95be4 100644 --- a/src/dudki.cc +++ b/src/dudki.cc @@ -1,292 +1,294 @@ #include <unistd.h> #include <signal.h> #include <syslog.h> #include <errno.h> #include <iostream> #include <fstream> #include <stdexcept> +#include <cstring> +#include <stdlib.h> 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) 2004-2006 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) { process::prepare_herd(); for(processes_t::iterator i=config.processes.begin();i!=config.processes.end();++i) i->second.check(i->first,config); process::unprepare_herd(); } 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: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"); if(op_signum) i->second.signal(op_signum); else i->second.check(); }catch(exception& e) { cerr << "dudki(" << argv[narg] << "): " << e.what() << endl; failures++; } } if(failures) throw runtime_error("not all processes have been successfully signaled"); } exit(0); }catch(exception& e) { exit(1); } break; case op_ensure: try { signal_self(config,0); break; }catch(exception& e) { syslog(LOG_NOTICE,"The dudki process is down, taking its place"); config.daemonize = true; }catch(int zero) { // we throw zero in case we're ensuring that this very process is running. // we don't have to daemonize if we're daemonic. config.daemonize = false; } case op_default: case op_work: { if(config.daemonize) { pid_t pf = fork(); if(pf<0) throw runtime_error(string(__PRETTY_FUNCTION__)+": failed to fork()"); if(pf) { _exit(0); } } pid_file pidfile; pidfile.set(config.pidfile); signal(SIGINT,lethal_signal_handler); signal(SIGABRT,lethal_signal_handler); signal(SIGTERM,lethal_signal_handler); signal(SIGHUP,sighup_handler); sigset_t sset; sigemptyset(&sset); sigaddset(&sset,SIGINT); sigaddset(&sset,SIGABRT); sigaddset(&sset,SIGTERM); sigaddset(&sset,SIGHUP); sigprocmask(SIG_UNBLOCK,&sset,NULL); while(!finishing) { check_herd(config); sleep(config.check_interval); } if(restarting) execvp(_argv[0],_argv); } break; default: throw runtime_error(string(__PRETTY_FUNCTION__)+": internal error"); } }catch(exception& e) { cerr << "Oops: " << e.what() << endl; return 1; } exit(0); } |