add rt_ini daemonize ability

.gitignore

@@ -9,4 +9,5 @@
 rls/
 adm/
 pwre_db
+.vscode/
 

src/exe/rt_ini/src/rt_ini.c

@@ -35,10 +35,13 @@
  */
 
 #include <stdio.h>
+#include <string.h>
 #if defined OS_LYNX
 # include <sys/wait.h>
 #elif defined OS_POSIX
 # include <sys/wait.h>
+# include <sys/types.h>
+# include <sys/stat.h>
 # include <fcntl.h>
 # include <unistd.h>
 #else
@@ -65,23 +68,31 @@
 #include "rt_errh_msg.h"
 #include "rt_pwr_msg.h"
 
+#define RT_INI_PIDFILE "/run/pwr/pwr.pid\0"
+
 static ini_sContext	*createContext (int argc, char **argv);
-static int		checkErrors (ini_sContext*);
+static int		checkErrors (ini_sContext *cp);
 static pwr_tStatus	events (ini_sContext *cp);
+static void daemonize();
+static void create_pidfile();
 static pwr_tStatus	interactive (int argc, char **argv, ini_sContext *cp);
-static pwr_tStatus	stop (int argc, char **argv, ini_sContext *cp);
+static pwr_tStatus	stop (ini_sContext *cp);
 static void 		create_locks();
 static void 		delete_locks();
 static void		load_backup ();
-static void		logChanges (ini_sContext*);
-static void		logCardinality (ini_sContext*);
+static void		logChanges (ini_sContext *cp);
+static void		logCardinality (ini_sContext *cp);
 static pwr_tStatus	restart (ini_sContext *cp);
-static pwr_tStatus	terminate (ini_sContext *cp);
+static pwr_tStatus	terminate ();
 static pwr_tStatus	start (ini_sContext *cp);
 static void		usage (char*);
 static void             ini_errl_cb( void *userdata, char *str, char severity,
                                      pwr_tStatus sts, int anix, int message_type);
 
+void handle_signal(int sig, siginfo_t *si, void *ctx);
+
+static int pid_fd = -1;
+static char *pid_filename = NULL;
 
 void set_valid_time()
 {
@@ -98,14 +109,28 @@ int main (int argc, char **argv)
 
   cp = createContext(argc, argv);
 
-  ver_WriteVersionInfo("Proview Runtime Environment");
+  ver_WriteVersionInfo("ProviewR Runtime Environment");
 
   if (cp->flags.b.restart) {
     sts = interactive(argc, argv, cp);
   } else if (cp->flags.b.stop) {
-    sts = stop(argc, argv, cp);
+    sts = stop(cp);
   } else {
+
+    //Now lets daemonize if asked to
+    if (cp->flags.b.daemonize)
+    {
+      daemonize();
+    }
+
     sts = start(cp);
+
+    //Now lets create the pid file before starting our endless event loop
+    if (cp->flags.b.daemonize)
+    {
+      create_pidfile();
+    }
+
     sts = events(cp);
     errh_LogInfo(&cp->log, "Ich sterbe!!");
   }
@@ -114,9 +139,7 @@ int main (int argc, char **argv)
 }
 
 static pwr_tStatus
-start (
-  ini_sContext *cp
-)
+start (ini_sContext *cp)
 {
   pwr_tStatus sts;
   char console[80];
@@ -332,11 +355,7 @@ interactive (
 }
 
 static pwr_tStatus
-stop (
-  int		argc,
-  char		**argv,
-  ini_sContext	*cp
-)
+stop (ini_sContext *cp)
 {
   pwr_tStatus	sts;
   qcom_sQid	qid;
@@ -351,7 +370,6 @@ stop (
 //  errh_Interactive();
 
   if (!qcom_Init(&sts, 0, "pwr_ini_stop")) {
-//    errh_LogFatal(&cp->log, "qcom_Init, %m", sts);
     exit(sts);
   }
 
@@ -403,9 +421,7 @@ stop (
 }
 
 static pwr_tStatus
-restart (
-  ini_sContext	*cp
-)
+restart (ini_sContext *cp)
 {
   pwr_tStatus	sts;
   char time[24];
@@ -487,9 +503,7 @@ restart (
 }
 
 static pwr_tStatus
-terminate (
-  ini_sContext	*cp
-)
+terminate ()
 {
   pwr_tStatus	sts;
 
@@ -531,12 +545,11 @@ terminate (
   errl_Unlink();
 #endif
 
-  exit(1);
+  exit(EXIT_SUCCESS);
 }
 
 static int
 ask_yes_no (
-  ini_sContext	*cp,
   char *text
 )
 {
@@ -548,9 +561,7 @@ ask_yes_no (
 }
 
 static int
-checkErrors (
-  ini_sContext	*cp
-)
+checkErrors (ini_sContext *cp)
 {
 
   if (cp->warnings == 0 && cp->errors == 0 && cp->fatals == 0)
@@ -562,7 +573,7 @@ checkErrors (
       errh_LogInfo(&cp->log, "Ignoring fatal errors, errors and warnings, continued...");
       return 1;
     } else {
-      return ask_yes_no(cp, "Do you want to continue");
+      return ask_yes_no("Do you want to continue");
     }
   }
   if (cp->errors > 0) {
@@ -571,7 +582,7 @@ checkErrors (
       errh_LogInfo(&cp->log, "Ignoring errors and warnings, continued...");
       return 1;
     } else {
-      return ask_yes_no(cp, "Do you want to continue");
+      return ask_yes_no("Do you want to continue");
     }
   }
   if (cp->warnings > 0) {
@@ -580,7 +591,7 @@ checkErrors (
       errh_LogInfo(&cp->log, "Ignoring warnings, continued...");
       return 1;
     } else {
-      return ask_yes_no(cp, "Do you want to continue");
+      return ask_yes_no("Do you want to continue");
     }
   }
   return 1;
@@ -727,6 +738,20 @@ createContext (int argc, char **argv)
           i++;
           i_incr = 1;
           break;
+        case 'D':
+            cp->flags.b.daemonize = 1;
+            break;
+        case 'P':
+            if ( i + 1 >= argc ||
+                 !(argv[i][j+1] == ' ' || argv[i][j+1] != '	')) {
+              usage( argv[0]);
+              exit(0);
+            }
+            cp->flags.b.daemonize = 1;
+            pid_filename = strdup(argv[i+1]);
+            i++;
+            i_incr = 1;
+            break;
         case '?':
           usage(argv[0]);
           break;
@@ -773,15 +798,15 @@ usage (
   fprintf(stderr, "  -v    : verbose\n");
   fprintf(stderr, "  -w    : ignore warnings\n");
   fprintf(stderr, "  -A arg: use 'arg' as alias file\n");
+  fprintf(stderr, "  -D    : Daemonize rt_ini. Default PID file is /run/pwr/pwr.pid\n");
+  fprintf(stderr, "  -p    : PID file, implies -D\n");
   fprintf(stderr, "  -H arg: use 'arg' as hostname\n");
   fprintf(stderr, "  -N arg: use 'arg' as nodename\n");
   exit(1);
 }
 
 static void
-logChanges (
-  ini_sContext *cp
-)
+logChanges (ini_sContext *cp)
 {
   lst_sEntry *vl;
   lst_sEntry *ol;
@@ -824,9 +849,7 @@ logChanges (
 }
 
 static void
-logCardinality (
-  ini_sContext *cp
-)
+logCardinality (ini_sContext *cp)
 {
   lst_sEntry *vl;
   ivol_sVolume *vp;
@@ -838,9 +861,7 @@ logCardinality (
 }
 
 static pwr_tStatus
-events (
-  ini_sContext	*cp
-)
+events (ini_sContext *cp)
 {
   lst_sEntry	*pl;
   ini_sProc	*pp;
@@ -921,8 +942,8 @@ events (
       }
     }
 #endif
-
   }
+
   return INI__SUCCESS;
 }
 
@@ -1580,3 +1601,148 @@ static void ini_errl_cb( void *userdata, char *str, char severity, pwr_tStatus s
     break;
   }
 }
+
+/**
+ * @brief create_pidfile Creates a pidfile for the process for things like systemd to keep track of.
+ */
+static void create_pidfile()
+{
+  char str[256];
+
+  if (pid_filename == NULL)
+    pid_filename = strdup(RT_INI_PIDFILE);
+
+  pid_fd = open(pid_filename, O_RDWR|O_CREAT, 0640);
+  if (pid_fd < 0)
+  {
+    exit(EXIT_FAILURE);
+  }
+
+  if (lockf(pid_fd, F_TLOCK, 0) < 0)
+  {
+    exit(EXIT_FAILURE);
+  }
+
+  sprintf(str, "%d\n", getpid());
+  write(pid_fd, str, strlen(str));
+}
+
+/**
+ * @brief daemonize Forks twice in order to detach itself properly. Closes all file descriptors currently open.
+ */
+static void daemonize() {
+  pid_t pid = 0;
+  struct sigaction act;
+
+  // First fork
+  pid = fork();
+  if (pid < 0) exit(EXIT_FAILURE);
+  // Let the parent exit
+  if (pid > 0) exit(EXIT_SUCCESS);
+
+  //Set the process to be session leader
+  if (setsid() < 0) exit(EXIT_FAILURE);
+
+  //Ignore any signals from children
+  signal(SIGCHLD, SIG_IGN);
+
+  //Second fork
+  pid = fork();
+  if (pid < 0) exit(EXIT_FAILURE);
+  // Bye bye parent
+  if (pid > 0) exit(EXIT_SUCCESS);
+
+  umask(002);
+  chdir("/");
+
+  //Close all file descriptors
+  for (int fd = sysconf(_SC_OPEN_MAX); fd > 0; fd--)
+    close(fd);
+
+  //Reopen some fds
+  stdin = fopen("/dev/null", "r");
+  stdout = fopen("/dev/null", "w+");
+  stderr = fopen("/dev/null", "w+");
+
+  // Register signal handler
+  act.sa_handler = NULL;
+  act.sa_sigaction = handle_signal;
+  act.sa_flags |= SA_SIGINFO;
+
+  if ((sigemptyset(&act.sa_mask) == -1) || (sigaction(SIGTERM, &act, NULL) == -1) || (sigaction(SIGHUP, &act, NULL) == -1))
+  {
+    perror("Could not set up signal handlers for rt_ini");
+  }
+
+  //signal(SIGTERM, handle_signal);
+  //signal(SIGINT, handle_signal);
+}
+
+//void handle_signal(int sig)
+//{
+//  //pwr_tStatus sts;
+
+//  switch (sig) {
+//    case SIGTERM:
+//    {
+//      errh_LogInfo(&cp->log, "SIGNAL CAUGHT (%d). Exiting!\n", sig, cp->node.bodySize);
+//      stop();
+//      //running = 0;
+//      if (cp->flags.b.daemonize)
+//      {
+//        if (pid_fd != -1)
+//        {
+//          lockf(pid_fd, F_ULOCK, 0);
+//          close(pid_fd);
+//        }
+
+//        if (pid_filename != NULL)
+//        {
+//          unlink(pid_filename);
+//        }
+//      }
+//    }
+//    default:
+//      // Noop
+//      break;
+//  }
+//}
+
+/**
+ * @brief handle_signal
+ * @param sig
+ * @param si
+ * @param ctx
+ */
+void handle_signal(int sig, siginfo_t *si, void *ctx)
+{
+  ini_sContext *cp = (ini_sContext*)ctx;
+
+  switch (sig) {
+    case SIGTERM:
+      errh_LogInfo(&cp->log, "SIGNAL CAUGHT (%d). Exiting!\n", sig, cp->node.bodySize);
+      stop(cp);
+      //running = 0;
+      if (cp->flags.b.daemonize)
+      {
+        if (pid_fd != -1)
+        {
+          lockf(pid_fd, F_ULOCK, 0);
+          close(pid_fd);
+        }
+
+        if (pid_filename != NULL)
+        {
+          unlink(pid_filename);
+        }
+      }
+      break;
+    case SIGHUP:
+      errh_LogInfo(&cp->log, "SIGNAL CAUGHT (%d). Restarting!\n", sig, cp->node.bodySize);
+      //TODO restart :)
+      break;
+    default:
+      // Noop
+      break;
+  }
+}

src/lib/rt/src/rt_ini_load.h

@@ -57,7 +57,8 @@ typedef union {
     pwr_Bits( verbose	    , 1),
     pwr_Bits( restart	    , 1),
     pwr_Bits( stop	    , 1),
-    pwr_Bits( fill_0	    , 2),,,
+    pwr_Bits( daemonize	    , 1),
+    pwr_Bits( fill_0	    , 1),,
 
     pwr_Bits( interactive   , 1),
     pwr_Bits( busid	    , 1),
@@ -82,6 +83,7 @@ typedef union {
 #define ini_mContext_verbose		pwr_Bit(3)
 #define ini_mContext_restart		pwr_Bit(4)
 #define ini_mContext_stop		pwr_Bit(5)
+#define ini_mContext_daemonize		pwr_Bit(6)
 
 #define ini_mContext_interactive	pwr_Bit(8)
 #define ini_mContext_busid		pwr_Bit(9)