ALE_code/daemon_test.c at master · shenhaoisme/ALE_code · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
/*

Sep 30 14:59:36 izm5eavb11mttn4gjzqgm4z daemontest[13176]: program started.
Sep 30 15:00:01 izm5eavb11mttn4gjzqgm4z systemd[1]: Created slice User Slice of root.
Sep 30 15:00:01 izm5eavb11mttn4gjzqgm4z systemd[1]: Starting User Slice of root.
Sep 30 15:00:01 izm5eavb11mttn4gjzqgm4z systemd[1]: Started Session 1994 of user root.
Sep 30 15:00:01 izm5eavb11mttn4gjzqgm4z systemd[1]: Starting Session 1994 of user root.
Sep 30 15:00:01 izm5eavb11mttn4gjzqgm4z systemd[1]: Removed slice User Slice of root.
Sep 30 15:00:01 izm5eavb11mttn4gjzqgm4z systemd[1]: Stopping User Slice of root.
Sep 30 15:00:02 izm5eavb11mttn4gjzqgm4z syslog-ng[458]: Log statistics; processed='destination(d_spol)=0',
processed='src.internal(s_sys#2)=1596', stamp='src.internal(s_sys#2)=1538290202',
processed='center(received)=1596',processed='destination(d_mesg)=13673',processed='destination(d_mail)=4',
processed='destination(d_auth)=3177',
processed='destination(d_mlal)=0', processed='center(queued)=19453', processed='src.none()=0', stamp='src.none()=0',
processed='destination(d_cron)=2587', processed='global(payload_reallocs)=3208', processed='global(sdata_updates)=0',
processed='destination(d_boot)=0', processed='destination(d_kern)=12', processed='global(msg_clones)=0', processed='source(s_sys)=1596'
Sep 30 15:00:03 izm5eavb11mttn4gjzqgm4z daemontest[13176]: program terminated.
*/

#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <stdio.h>
#include <syslog.h>
#include <signal.h>
int daemon_init(void)
{
    pid_t pid;
  if((pid = fork()) < 0)
    return(-1);
  else if(pid != 0)
    exit(0); /* parent exit */
/* child continues */
  setsid(); /* become session leader */
  chdir("/"); /* change working directory */
  umask(0); /* clear file mode creation mask */
  close(0); /* close stdin */
  close(1); /* close stdout */
  close(2); /* close stderr */
  return(0);
}
 //等待关闭
void sig_term(int signo)
{
    if(signo == SIGTERM)
/* catched signal sent by kill(1) command */
  {
    syslog(LOG_INFO, "program terminated.");
  closelog();
  exit(0);
  }
}

int main(void)
{
    if(daemon_init() == -1)
  {
    printf("can't fork self/n");
    exit(0);
  }
  openlog("daemontest", LOG_PID, LOG_USER);
  syslog(LOG_INFO, "program started.");
  signal(SIGTERM, sig_term); /* arrange to catch the signal */
  while(1)
  {
    sleep(1); /* put your main program here */
  }
  return(0);
}