| 1 |
#include <iostream> |
| 2 |
|
| 3 |
#include <signal.h> |
| 4 |
#include <fcntl.h> |
| 5 |
#include <stdlib.h> |
| 6 |
#include <cstring> |
| 7 |
|
| 8 |
#include <sys/types.h> |
| 9 |
#include <pwd.h> |
| 10 |
#include <grp.h> |
| 11 |
|
| 12 |
|
| 13 |
#include "daemon.h" |
| 14 |
#include "common.h" |
| 15 |
|
| 16 |
|
| 17 |
|
| 18 |
using namespace std; |
| 19 |
|
| 20 |
|
| 21 |
void signal_handler(int sig) |
| 22 |
{ |
| 23 |
switch (sig) |
| 24 |
{ |
| 25 |
case SIGHUP: |
| 26 |
Common::instance()->logMessage("hangup signal catched"); |
| 27 |
break; |
| 28 |
|
| 29 |
case SIGTERM: |
| 30 |
Common::instance()->logMessage("terminate signal catched...exiting"); |
| 31 |
Common::instance()->mainContinue = false; |
| 32 |
break; |
| 33 |
} |
| 34 |
} |
| 35 |
|
| 36 |
void lookup_uid_values() |
| 37 |
{ |
| 38 |
Common* cmn = Common::instance(); |
| 39 |
|
| 40 |
passwd* pass = getpwnam("smsdaemon"); |
| 41 |
if (pass != 0) |
| 42 |
{ |
| 43 |
cmn->uid = pass->pw_uid; |
| 44 |
} |
| 45 |
else |
| 46 |
{ |
| 47 |
cmn->logMessage("could not lookup userid: smsdaemon"); |
| 48 |
exit(1); |
| 49 |
} |
| 50 |
|
| 51 |
group* grp = getgrnam("smsdaemon"); |
| 52 |
if (grp != 0) |
| 53 |
{ |
| 54 |
cmn->gid = grp->gr_gid; |
| 55 |
} |
| 56 |
else |
| 57 |
{ |
| 58 |
cmn->logMessage("could not lookup groupid: smsdaemon"); |
| 59 |
exit(1); |
| 60 |
} |
| 61 |
} |
| 62 |
|
| 63 |
|
| 64 |
void daemonCleanup() |
| 65 |
{ |
| 66 |
unlink( Common::instance()->pidfile.c_str() ); |
| 67 |
} |
| 68 |
|
| 69 |
void daemonize() |
| 70 |
{ |
| 71 |
int i, lfp; |
| 72 |
char str[10]; |
| 73 |
Common* cmn = Common::instance(); |
| 74 |
|
| 75 |
if (getuid() != 0) |
| 76 |
{ |
| 77 |
cout << "Please start this daemon as root\n" << endl; |
| 78 |
daemon_shutdown(0); |
| 79 |
} |
| 80 |
|
| 81 |
|
| 82 |
if (getppid() == 1) /* already a daemon */ |
| 83 |
return; |
| 84 |
|
| 85 |
i=fork(); |
| 86 |
|
| 87 |
if (i<0) /* fork error */ |
| 88 |
daemon_shutdown(FORK_ERROR); |
| 89 |
if (i>0) /* parent exits */ |
| 90 |
daemon_shutdown(0); |
| 91 |
/* child daemon continues */ |
| 92 |
|
| 93 |
setsid(); /* obtain a new process group */ |
| 94 |
|
| 95 |
for (i=getdtablesize(); i>=0; --i) |
| 96 |
close(i); /*close all descriptors*/ |
| 97 |
|
| 98 |
i=open("/dev/null", O_RDWR); /* handle std. io */ |
| 99 |
dup(i); |
| 100 |
dup(i); |
| 101 |
|
| 102 |
umask(027); /* set newly created file permissions */ |
| 103 |
|
| 104 |
chdir("/tmp"); /* change running directory*/ |
| 105 |
|
| 106 |
/*attempt to create lockfile and put a file-lock on it*/ |
| 107 |
lfp=open(cmn->pidfile.c_str(), O_RDWR|O_CREAT, 0640); |
| 108 |
if (lfp<0) /* can not open */ |
| 109 |
daemon_shutdown(CANT_OPEN_LOCK); |
| 110 |
if (lockf(lfp,F_TLOCK,0) < 0) /* can not lock */ |
| 111 |
daemon_shutdown(ALREADY_LOCKED); |
| 112 |
|
| 113 |
/* first instance continues */ |
| 114 |
sprintf(str, "%d\n", getpid() ); /* record pid to lockfile */ |
| 115 |
write(lfp, str, strlen(str) ); |
| 116 |
//signal(SIGCHLD, SIG_IGN); /* ignore child */ |
| 117 |
signal(SIGTSTP, SIG_IGN); /* ignore tty signals */ |
| 118 |
signal(SIGTTOU, SIG_IGN); |
| 119 |
signal(SIGTTIN, SIG_IGN); |
| 120 |
signal(SIGHUP, signal_handler); /* catch hangup signal */ |
| 121 |
signal(SIGTERM, signal_handler); /* catch kill signal */ |
| 122 |
|
| 123 |
/*this program is now a daemon*/ |
| 124 |
setegid( cmn->gid ); |
| 125 |
seteuid( cmn->uid ); |
| 126 |
} |
Parent Directory
| 
Revision Log