[英]Daemon Not Stopping in linux
我使用了以下指南(http://peterlombardo.wikidot.com/linux-daemon-in-c),它工作得很好,很漂亮,接受它不會殺死。
//Global Directives
//#define DEBUG 1
#define DAE_NAME "dae"
#define DAE_PID "/var/run/dae.pid"
//Includes
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <sstream>
#include <string>
#include <fstream>
#include <iomanip>
#include <vector>
#include <syslog.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
#include <signal.h>
//Namespace (System)
using namespace std;
//Classes
#include "class.h"
//Structures
#include "struct/struct.h"
//Functions
#include "function/signal_handler.h"
void usage(int argc, char *argv[]) {
if (argc >=1) {
printf("Usage: %s -h -nn", argv[0]);
printf(" Options:n");
printf(" -ntDon't fork off as a daemon.n");
printf(" -htShow this help screen.n");
printf("n");
}
}
int main(int argc, char *argv[]) {
#if defined(DEBUG)
int daemonize = 0;
#else
int daemonize = 1;
#endif
// Setup signal handling before we start
signal(SIGHUP, signal_handler);
signal(SIGTERM, signal_handler);
signal(SIGINT, signal_handler);
signal(SIGQUIT, signal_handler);
//Print Usage Information
int c;
while((c = getopt(argc, argv, "nh|help")) != -1) {
switch(c){
case 'h':
usage(argc, argv);
exit(0);
break;
case 'n':
daemonize = 0;
break;
default:
usage(argc, argv);
exit(0);
break;
}
}
// Setup syslog logging
#if defined(DEBUG)
setlogmask(LOG_UPTO(LOG_DEBUG));
openlog(DAE_NAME, LOG_CONS | LOG_NDELAY | LOG_PERROR | LOG_PID, LOG_USER);
#else
setlogmask(LOG_UPTO(LOG_INFO));
openlog(DAE_NAME, LOG_CONS, LOG_USER);
#endif
//------------
//Daemon Setup
//------------
pid_t pid, sid;
if (daemonize) {
syslog(LOG_INFO, "Starting %s", DAE_NAME);
/* Fork off the parent process */
pid = fork();
if (pid < 0) {
exit(EXIT_FAILURE);
}
/* If we got a good PID, then
we can exit the parent process. */
if (pid > 0) {
exit(EXIT_SUCCESS);
}
/* Change the file mode mask */
umask(0);
/* Create a new SID for the child process */
sid = setsid();
if (sid < 0) {
/* Log the failure */
exit(EXIT_FAILURE);
}
/* Change the current working directory */
if ((chdir("/")) < 0) {
/* Log the failure */
exit(EXIT_FAILURE);
}
/* Close out the standard file descriptors */
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
}
int count = 1;
//-------
//Process
//-------
while (1){
process();
syslog (LOG_INFO, "%s Processed(%s, %d)", DAE_NAME, getlogin(), count);
count++;
}
syslog (LOG_INFO, "Exiting Daemon %s", DAE_NAME);
closelog (); //Close the Connection
exit(EXIT_SUCCESS);
}
#ifndef SIGNAL_HANDLER_H_
#define SIGNAL_HANDLER_H_
void signal_handler(int sig) {
switch(sig) {
case SIGHUP:
syslog(LOG_WARNING, "Received SIGHUP signal.", DAE_NAME);
break;
case SIGTERM:
syslog(LOG_WARNING, "Received SIGTERM signal.", DAE_NAME);
break;
default:
syslog(LOG_WARNING, "Unhandled signal ", DAE_NAME);
break;
}
}
#endif
所以在命令行中我運行它
./dae
然后我跑了
殺死了procid
INFROMATIONAL,開始dae
INFORMATIONAL,dae已處理((null),1)
INFORMATIONAL,dae已處理((null),2)
INFORMATIONAL,dae已處理((null),3)
警告,收到SIGTERM信號。
INFORMATIONAL,dae已處理((null),4)
INFORMATIONAL,dae已處理((null),5)
該死的東西沒有停止? 任何想法謝謝
由於您正在處理TERM信號,因此禁用其默認行為。
您需要從信號處理程序中顯式調用exit()以使程序終止。
這是一個允許清理並且不使用atexit()的實現 :
signal_handler.h
#ifndef SIGNAL_HANDLER_H_
#define SIGNAL_HANDLER_H_
extern bool g_terminated;
void signal_handler(int sig) {
switch(sig) {
case SIGHUP:
syslog(LOG_WARNING, "Received SIGHUP signal.", DAE_NAME);
break;
case SIGTERM:
syslog(LOG_WARNING, "Received SIGTERM signal.", DAE_NAME);
g_terminated = true;
break;
default:
syslog(LOG_WARNING, "Unhandled signal ", DAE_NAME);
break;
}
}
#endif
main.cpp中
bool g_terminated = false;
int main(int argc, char *argv[])
{
.
.
.
//-------
//Process
//-------
while (!g_terminated) {
process();
syslog (LOG_INFO, "%s Processed(%s, %d)", DAE_NAME, getlogin(), count);
count++;
}
// Cleanup...
exit(EXIT_SUCCESS);
}
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