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processes specified by process names (pidof-like).

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1 parent 125671c commit fbc32792b8d8266ff90aa60403f5da78739236f4 @hacker committed Jul 24, 2004
Showing with 131 additions and 14 deletions.
  1. +2 −1 NEWS.xml
  2. +5 −1 man/dudki.conf.5.in
  3. +5 −0 src/configuration.cc
  4. +6 −1 src/dudki.cc
  5. +107 −11 src/process.cc
  6. +6 −0 src/process.h
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@@ -1,7 +1,8 @@
<?xml version="1.0" encoding="us-ascii"?>
<news>
- <version version="0.2" date="July 23rd, 2004">
+ <version version="0.2" date="July 24th, 2004">
<ni>now dudki sends arbitrary signals to the processes being monitored from the command line</ni>
+ <ni>detection of running processes which do not keep pidfiles, using process name</ni>
</version>
<version version="0.1" date="July 21st, 2004">
<ni><kbd>initgroups()</kbd> called before executing <kbd>RestartCommand</kbd></ni>
View
@@ -1,4 +1,4 @@
-.TH dudki.conf 5 "July 9th, 2004" "dudki.conf(5)" "Klever Group (http://www.klever.net/)"
+.TH dudki.conf 5 "July 24th, 2004" "dudki.conf(5)" "Klever Group (http://www.klever.net/)"
.hla en
.SH NAME
@@ -60,6 +60,10 @@ monitored from. The absence of file, as well as the absence of process
specified by the pid stored in the file signifies the process death and
triggers restart.
.TP
+\fBProcessName\fR \fIprocess name\fR
+Specifies the name of the process. The alternative way to find process if it
+doesn't keep pid in the file. Similar to \fBpidof\fR(1).
+.TP
\fBRestartCommand\fR \fIcommand\fR
Specifies the command to run in order to restart the process.
.TP
View
@@ -92,6 +92,10 @@ static DOTCONF_CB(dco__process) { dc_context *dcc = (dc_context*)ctx;
return NULL;
}
+static DOTCONF_CB(dco_process_name) { dc_context *dcc = (dc_context*)ctx;
+ dcc->ps->process_name = cmd->data.str;
+ return NULL;
+}
static DOTCONF_CB(dco_restart_command) { dc_context *dcc = (dc_context*)ctx;
dcc->ps->restart_cmd = cmd->data.str;
return NULL;
@@ -116,6 +120,7 @@ static const configoption_t dc_options[] = {
{ "MailtoHeader", ARG_STR, dco_mailto_header, NULL, DCC_ROOT|DCC_PROCESS },
{ "Notify", ARG_STR, dco_notify, NULL, DCC_ROOT|DCC_PROCESS },
{ "<Process", ARG_STR, dco_process, NULL, DCC_ROOT },
+ { "ProcessName", ARG_STR, dco_process_name, NULL, DCC_PROCESS },
{ "RestartCommand", ARG_STR, dco_restart_command, NULL, DCC_PROCESS },
{ "User", ARG_STR, dco_user, NULL, DCC_PROCESS },
{ "Group", ARG_STR, dco_group, NULL, DCC_PROCESS },
View
@@ -35,8 +35,10 @@ static void sighup_handler(int signum) {
}
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) {
@@ -220,7 +222,10 @@ int main(int argc,char **argv) {
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);
+ if(op_signum)
+ i->second.signal(op_signum);
+ else
+ i->second.check();
}catch(exception& e) {
cerr << "dudki(" << argv[narg] << "): " << e.what() << endl;
failures++;
View
@@ -4,19 +4,35 @@
#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
@@ -176,14 +192,94 @@ void process::notify_mailto(const string& email,const string& id,const string& e
}
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));
+ }
}
View
@@ -12,6 +12,7 @@ typedef map<string,string> headers_t;
class process {
public:
string pidfile;
+ string process_name;
string restart_cmd;
string notify;
string user;
@@ -31,6 +32,11 @@ class process {
const string& description,configuration& config);
void signal(int signum) const;
+ void check() const;
+
+ static void prepare_herd();
+ static void gather_proc_info();
+ static void unprepare_herd();
};
typedef map<string,process> processes_t;

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