| -rw-r--r-- | src/process.cc | 118 |
1 files changed, 107 insertions, 11 deletions
diff --git a/src/process.cc b/src/process.cc index 1ffac9f..8a5b5d2 100644 --- a/src/process.cc +++ b/src/process.cc @@ -1,35 +1,51 @@ #include <stdio.h> #include <sys/types.h> #include <unistd.h> #include <signal.h> #include <pwd.h> #include <grp.h> +#include <dirent.h> #include <sys/wait.h> #include <syslog.h> #include <errno.h> #include <iostream> #include <fstream> +#include <sstream> #include <stdexcept> +#include <string> +#include <vector> using namespace std; #include "process.h" #include "configuration.h" +static multimap<string,pid_t> procpids; + +void process::check() const { + if(!pidfile.empty()) { + signal(0); + }else if(!process_name.empty()) { + if(procpids.empty()) + gather_proc_info(); + if(procpids.find(process_name)==procpids.end()) + throw runtime_error("no such process"); + } // XXX: or else? +} void process::check(const string& id,configuration& config) { try { - signal(0); + check(); patience = 0; }catch(exception& e) { if(patience>60) { // TODO: configurable patience = 0; }else{ if(patience<10) { // TODO: configurable syslog(LOG_NOTICE,"The process '%s' is down, trying to launch.",id.c_str()); do_notify(id,"Starting up", "The named process seems to be down. Dudki will try\n" "to revive it by running the specified command.\n", config); try { launch(id,config); }catch(exception& e) { syslog(LOG_ERR,"Error trying to launch process '%s': %s",id.c_str(),e.what()); } @@ -163,27 +179,107 @@ void process::notify_mailto(const string& email,const string& id,const string& e fprintf(mta,"%s: %s\n",i->first.c_str(),i->second.c_str()); } fprintf(mta, "Subject: [%s] %s\n\n" "%s\n" "---\n" "This message was sent automatically by the 'dudki' daemon\n", id.c_str(), event.c_str(), description.c_str() ); fclose(mta); int status; waitpid(pid,&status,0); // TODO: check the return code } void process::signal(int signum) const { - ifstream pids(pidfile.c_str(),ios::in); - if(!pids) - throw runtime_error("no pidfile found"); - pid_t pid = 0; - pids >> pid; - pids.close(); - if(!pid) - throw runtime_error("no pid in pidfile"); - if(kill(pid,signum)) - throw runtime_error("failed to signal process"); + if(!pidfile.empty()) { + ifstream pids(pidfile.c_str(),ios::in); + if(!pids) + throw runtime_error("no pidfile found"); + pid_t pid = 0; + pids >> pid; + pids.close(); + if(!pid) + throw runtime_error("no pid in pidfile"); + if(kill(pid,signum)) + throw runtime_error("failed to signal process"); + }else if(!process_name.empty()) { + if(procpids.empty()) + gather_proc_info(); + pair<multimap<string,pid_t>::const_iterator,multimap<string,pid_t>::const_iterator> range = procpids.equal_range(process_name); + int count = 0; + for(multimap<string,pid_t>::const_iterator i=range.first;i!=range.second;++i) { + pid_t pid = i->second; + if(kill(i->second,signum)) + throw runtime_error("failed to signal process"); + count++; + } + if(!count) + throw runtime_error("no running instance detected"); + }else + throw runtime_error("nothing is known about the process"); +} + +void process::prepare_herd() { + procpids.clear(); +} +void process::unprepare_herd() { + procpids.clear(); +} +void process::gather_proc_info() { + vector<pid_t> allpids; + DIR *pd = opendir("/proc"); + if(!pd) + throw runtime_error("failed to open /proc"); + struct dirent *pde; + pid_t selfpid = getpid(); + while(pde=readdir(pd)) { + errno=0; + pid_t pid = atoi(pde->d_name); + if((!pid) || pid==selfpid) + continue; + allpids.push_back(pid); + } + closedir(pd); + char s[256]; + procpids.clear(); + for(vector<pid_t>::const_iterator i=allpids.begin();i!=allpids.end();++i) { + int r = snprintf(s,sizeof(s),"/proc/%d/stat",*i); + if(r>=sizeof(s) || r<1) + continue; + string cmd; + ifstream ss(s,ios::in); + if(!ss) + continue; + getline(ss,cmd); + string::size_type op = cmd.find('('); + if(op==string::npos) + continue; + cmd.erase(0,op+1); + string::size_type cp = cmd.find(')'); + if(cp==string::npos) + continue; + cmd.erase(cp); + r = snprintf(s,sizeof(s),"/proc/%d/cmdline",*i); + if(r>=sizeof(s) || r<1) + continue; + ifstream cs(s,ios::binary); + if(!cs) + continue; + string command; + while(cs) { + string cl; + getline(cs,cl,(char)0); + string::size_type lsl = cl.rfind('/'); + if(lsl!=string::npos) + cl.erase(0,lsl+1); + if(cl.substr(0,cmd.length())==cmd) { + command = cl; + break; + } + } + procpids.insert(pair<string,pid_t>(cmd,*i)); + if((!command.empty()) && cmd!=command) + procpids.insert(pair<string,pid_t>(command,*i)); + } } |