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authorMichael Krelin <hacker@klever.net>2004-07-23 20:40:46 (UTC)
committer Michael Krelin <hacker@klever.net>2004-07-23 20:40:46 (UTC)
commit546858a1e4d13d179a6af27b474e1396cfdf0c29 (patch) (side-by-side diff)
treeac19b0ff5e4b3164ad5375bda112a9d6d2f88c2b
parent76921288a0aa39acb53102863523c388b5d0f9ee (diff)
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the ability to check/kill/reload any of the processes being monitored added.
Diffstat (more/less context) (show whitespace changes)
-rw-r--r--man/dudki.8.in11
-rw-r--r--src/dudki.cc55
-rw-r--r--src/process.cc30
-rw-r--r--src/process.h2
4 files changed, 62 insertions, 36 deletions
diff --git a/man/dudki.8.in b/man/dudki.8.in
index 3011034..05db733 100644
--- a/man/dudki.8.in
+++ b/man/dudki.8.in
@@ -23,12 +23,13 @@ dudki \- a process monitoring daemon
[\fB-c\fR]
.if \*[longopt] [\fB--check\fR]
[\fB-e\fR]
.if \*[longopt] [\fB--ensure\fR]
[\fB-t\fR]
.if \*[longopt] [\fB--test\fR]
+[\fI<process-list>\fR]
.SH DESCRIPTION
dudki daemon is designed to run in the background and periodically
check if certain processes specified in the configuration file are
running. If a process is detected as dead dudki tries to restart it
@@ -42,21 +43,25 @@ the specified contact (currently only via email).
.el \fB-f\fR \fIconfigfile\fR
Specify the configuration file to use (default is
\fI@sysconfdir@/dudki.conf\fR).
.TP
.ie \*[longopt] \fB-k\fR, \fB--kill\fR
.el \fB-k\fR
-Stop the running instance by sending the \fBSIGTERM\fR signal.
+Stop the running instance by sending the \fBSIGTERM\fR signal. If no process
+name specified on the command line, dudki kills his own running instance.
.TP
.ie \*[longopt] \fB-r\fR, \fB--reload\fR
.el \fB-r\fR
-Reload the running instance by sending the \fBSIGHUP\fR signal.
+Reload the running instance by sending the \fBSIGHUP\fR signal. Like with
+\fB-k\fR, if no process name specified on the command line, dudki sends
+\fBSIGHUP\fR to his own running instance.
.TP
.ie \*[longopt] \fB-c\fR, \fB--check\fR
.el \fB-c\fR
-Check if dudki is running. Exit with non-zero status if not.
+Check if dudki is running. Exit with non-zero status if not. The same target
+rules as in \fB-k\fR and \fB-r\fR apply here.
.TP
.ie \*[longopt] \fB-e\fR, \fB--ensure\fR
.el \fB-e\fR
Ensure that dudki is running. Load, if not. Useful for running as a
cron job once in a while. If the daemon is running runs quietly
providing no output.
diff --git a/src/dudki.cc b/src/dudki.cc
index b4e95a7..e91ad5e 100644
--- a/src/dudki.cc
+++ b/src/dudki.cc
@@ -59,18 +59,17 @@ int main(int argc,char **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_hup,
- op_term,
- op_check,
+ op_signal,
op_ensure,
op_test
} op = op_default;
+ int op_signum = 0;
while(true) {
#define SHORTOPTSTRING "f:hVLrkcet"
#ifdef HAVE_GETOPT_LONG
static struct option opts[] = {
{ "help", no_argument, 0, 'h' },
{ "usage", no_argument, 0, 'h' },
@@ -90,35 +89,40 @@ int main(int argc,char **argv) {
#endif /* /HAVE_GETOPT_LONG */
if(c==-1)
break;
switch(c) {
case 'h':
cerr << PHEADER << endl
- << PCOPY << endl << 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\n"
+ " -k, --kill stop running instance (send SIGTERM)\n"
" -r, --reload reload running instance (send SIGHUP)\n"
- " -c, --check check if dudki is running\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\n"
+ " -k stop running instance (send SIGTERM)\n"
" -r reload running instance (send SIGHUP)\n"
- " -c check if dudki is running\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;
@@ -136,27 +140,27 @@ int main(int argc,char **argv) {
break;
case 'k':
if(op!=op_default) {
cerr << "Can't obey two or more orders at once" << endl;
exit(1);
}
- op = op_term;
+ 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_hup;
+ 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_check;
+ 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);
}
@@ -184,23 +188,36 @@ int main(int argc,char **argv) {
configuration config;
config.parse(config_file);
switch(op) {
case op_test:
cerr << "Configuration OK" << endl;
break;
- case op_hup:
- signal_self(config,SIGHUP);
- break;
- case op_term:
- signal_self(config,SIGTERM);
- break;
- case op_check:
+ case op_signal:
try{
- signal_self(config,0);
+ 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;
diff --git a/src/process.cc b/src/process.cc
index bfab311..1ffac9f 100644
--- a/src/process.cc
+++ b/src/process.cc
@@ -12,27 +12,16 @@
#include <stdexcept>
using namespace std;
#include "process.h"
#include "configuration.h"
void process::check(const string& id,configuration& config) {
- bool running = false;
- ifstream pids(pidfile.c_str(),ios::in);
- if(pids) {
- pid_t pid = 0;
- pids >> pid;
- pids.close();
- if(pid) {
- if(!kill(pid,0)) {
- running = true;
- }
- }
- }
- if(running){
+ try {
+ signal(0);
patience = 0;
- }else{
+ }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",
@@ -182,6 +171,19 @@ void process::notify_mailto(const string& email,const string& id,const string& e
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");
+}
diff --git a/src/process.h b/src/process.h
index b6d7091..27ee049 100644
--- a/src/process.h
+++ b/src/process.h
@@ -26,11 +26,13 @@ class process {
void check(const string& id,configuration& config);
void launch(const string& id,configuration& config);
void do_notify(const string& id,const string& event,const string& description,configuration& config);
void notify_mailto(const string& email,const string& id,const string& event,
const string& description,configuration& config);
+
+ void signal(int signum) const;
};
typedef map<string,process> processes_t;
#endif /* __PROCESS_H */