X-Git-Url: http://andersk.mit.edu/gitweb/moira.git/blobdiff_plain/554776b160abf316c6a8b3590be4253a449643cf..44d12d589b43a1d65d8af81559b3f1588d88acff:/server/mr_main.c

diff --git a/server/mr_main.c b/server/mr_main.c
index 09c09b38..cd021540 100644
--- a/server/mr_main.c
+++ b/server/mr_main.c
@@ -4,24 +4,34 @@
  *	$Header$
  *
  *	Copyright (C) 1987 by the Massachusetts Institute of Technology
+ *	For copying and distribution information, please see the file
+ *	<mit-copyright.h>.
  *
- *
- * 	SMS server process.
+ * 	MOIRA server process.
  *
  * 	Most of this is stolen from ../gdb/tsr.c
  *
  * 	You are in a maze of twisty little finite automata, all different.
  * 	Let the reader beware.
- * 
+ *
  */
 
-static char *rcsid_sms_main_c = "$Header$";
+static char *rcsid_mr_main_c = "$Header$";
 
-#include <strings.h>
+#include <mit-copyright.h>
+#include <string.h>
+#include <stdio.h>
+#include <sys/types.h>
 #include <sys/errno.h>
 #include <sys/signal.h>
 #include <sys/wait.h>
-#include "sms_server.h"
+#include <sys/stat.h>
+#include <unistd.h>
+#include <signal.h>
+#include "mr_server.h"
+#include <krb_et.h>
+#include <gdss_et.h>
+#include <arpa/inet.h>
 
 extern CONNECTION newconn, listencon;
 
@@ -40,222 +50,295 @@ extern char buf1[BUFSIZ];
 extern char *takedown;
 extern int errno;
 extern FILE *journal;
-#define JOURNAL "/u1/sms/journal"
 
-extern char *malloc();
-extern int free();
-extern char *inet_ntoa();
-extern void sms_com_err();
-extern void do_client();
+extern time_t now;
 
-extern int sigshut();
-void clist_append();
-void oplist_append();
-void reapchild();
+char hostbuf[BUFSIZ], *host;
 
-extern time_t now;
+int do_listen(char *port);
+void do_reset_listen(void);
+void clist_append(client *cp);
+void oplist_append(LIST_OF_OPERATIONS *oplp, OPERATION op);
+void oplist_delete(LIST_OF_OPERATIONS oplp, OPERATION op);
+void mr_setup_signals(void);
+int new_connection(void);
 
 /*
- * Main SMS server loop.
+ * Main MOIRA server loop.
  *
  * Initialize the world, then start accepting connections and
  * making progress on current connections.
  */
 
-/*ARGSUSED*/
-int
-main(argc, argv)
-	int argc;
-	char **argv;
+int main(int argc, char **argv)
 {
-	int status;
-	time_t tardy;
-	
-	whoami = argv[0];
-	/*
-	 * Error handler init.
-	 */
-	init_sms_err_tbl();
-	init_krb_err_tbl();
-	set_com_err_hook(sms_com_err);
-	setlinebuf(stderr);
-	
-	if (argc != 1) {
-		com_err(whoami, 0, "Usage: smsd");
-		exit(1);
-	}		
-
-	/* Profiling implies that getting rid of one level of call
-	 * indirection here wins us maybe 1% on the VAX.
-	 */
-	gdb_amv = malloc;
-	gdb_fmv = free;
-	
-	/*
-	 * GDB initialization.
-	 */
-	if(gdb_init() != 0) {
-		com_err(whoami, 0, "GDB initialization failed.");
-		exit(1);
+  int status, i;
+  time_t tardy;
+  char *port, *p;
+  extern char *database;
+  struct stat stbuf;
+
+  whoami = argv[0];
+  /*
+   * Error handler init.
+   */
+  initialize_sms_error_table();
+  initialize_krb_error_table();
+  initialize_gdss_error_table();
+  set_com_err_hook(mr_com_err);
+  setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
+
+  port = strchr(MOIRA_SERVER, ':') + 1;
+
+  for (i = 1; i < argc; i++)
+    {
+      if (!strcmp(argv[i], "-db") && i + 1 < argc)
+	{
+	  database = argv[i + 1];
+	  i++;
 	}
-	gdb_debug(0); /* this can be patched, if necessary, to enable */
-		      /* GDB level debugging .. */
-	krb_realm = malloc(REALM_SZ);
-	get_krbrlm(krb_realm, 1);
-	
-	/*
-	 * Database initialization.
-	 */
-
-	if ((status = sms_open_database()) != 0) {
-		com_err(whoami, status, " when trying to open database.");
-		exit(1);
+      else if (!strcmp(argv[i], "-p") && i + 1 < argc)
+	{
+	  port = argv[i + 1];
+	  i++;
 	}
-	
-	sanity_check_queries();
-	sanity_check_database();
-
-	/*
-	 * Set up client array handler.
-	 */
-	nclients = 0;
-	clients = (client **) malloc(0);
-	
-	/*
-	 * Signal handlers
-	 *	There should probably be a few more of these.
-	 */
-	
-	if ((((int)signal (SIGTERM, sigshut)) < 0) ||
-	    (((int)signal (SIGHUP, sigshut)) < 0)) {
-		com_err(whoami, errno, " Unable to establish signal handler.");
-		exit(1);
+      else
+	{
+	  com_err(whoami, 0, "Usage: moirad [-db database][-p port]");
+	  exit(1);
 	}
-	
-	journal = fopen(JOURNAL, "a");
-	if (journal == NULL) {
-	    com_err(whoami, errno, " while opening journal file");
-	    exit(1);
+    }
+
+  /*
+   * GDB initialization.
+   */
+  if (gdb_init() != 0)
+    {
+      com_err(whoami, 0, "GDB initialization failed.");
+      exit(1);
+    }
+  gdb_debug(0); /* this can be patched, if necessary, to enable */
+		/* GDB level debugging .. */
+  krb_realm = malloc(REALM_SZ);
+  krb_get_lrealm(krb_realm, 1);
+
+  /*
+   * Database initialization.  Only init if database should be open.
+   */
+
+  if (stat(MOIRA_MOTD_FILE, &stbuf) != 0)
+    {
+      if ((status = mr_open_database()))
+	{
+	  com_err(whoami, status, " when trying to open database.");
+	  exit(1);
 	}
+      sanity_check_database();
+    }
+  else
+    {
+      dormant = ASLEEP;
+      com_err(whoami, 0, "sleeping, not opening database");
+    }
+
+  sanity_check_queries();
+
+  /*
+   * Get moira server hostname for authentication
+   */
+  if (gethostname(hostbuf, sizeof(hostbuf)) < 0)
+    {
+      com_err(whoami, errno, "Unable to get local hostname");
+      exit(1);
+    }
+  host = canonicalize_hostname(strsave(hostbuf));
+  for (p = host; *p && *p != '.'; p++)
+    {
+      if (isupper(*p))
+	*p = tolower(*p);
+    }
+  *p = '\0';
+
+  /*
+   * Set up client array handler.
+   */
+  nclients = 0;
+  clients = malloc(0);
 
-	/*
-	 * Establish template connection.
-	 */
-	if ((status = do_listen()) != 0) {
-		com_err(whoami, status,
-			" while trying to create listening connection");
-		exit(1);
+  mr_setup_signals();
+
+  journal = fopen(JOURNAL, "a");
+  if (!journal)
+    {
+      com_err(whoami, errno, " while opening journal file");
+      exit(1);
+    }
+
+  /*
+   * Establish template connection.
+   */
+  if ((status = do_listen(port)))
+    {
+      com_err(whoami, status, " while trying to create listening connection");
+      exit(1);
+    }
+
+  op_list = create_list_of_operations(1, listenop);
+
+  com_err(whoami, 0, "started (pid %d)", getpid());
+  com_err(whoami, 0, rcsid_mr_main_c);
+  if (dormant != ASLEEP)
+    send_zgram("MOIRA", "server started");
+  else
+    send_zgram("MOIRA", "server started, but database closed");
+
+  /*
+   * Run until shut down.
+   */
+  while (!takedown)
+    {
+      int i;
+      /*
+       * Block until something happens.
+       */
+      if (dormant == SLEEPY)
+	{
+	  mr_close_database();
+	  com_err(whoami, 0, "database closed");
+	  mr_setup_signals();
+	  send_zgram("MOIRA", "database closed");
+	  dormant = ASLEEP;
 	}
-	
-	op_list = create_list_of_operations(1, listenop);
-	
-	com_err(whoami, 0, "started (pid %d)", getpid());
-	com_err(whoami, 0, rcsid_sms_main_c);
-	send_zgram("SMS", "server started");
-
-	/*
-	 * Run until shut down.
-	 */
-	while(!takedown) {		
-		register int i;
-		/*
-		 * Block until something happens.
-		 */
-#ifdef notdef
-		com_err(whoami, 0, "tick");
-#endif notdef
-		errno = 0;
-		status = op_select_any(op_list, 0,
-				       (fd_set *)NULL, (fd_set *)NULL,
-				       (fd_set *)NULL, (struct timeval *)NULL);
-
-		if (status == -1) {
-			com_err(whoami, errno, " error from op_select");
-			continue;
-		} else if (status != -2) {
-			com_err(whoami, 0, " wrong return from op_select_any");
-			continue;
-		}
-		if (takedown) break;
-		time(&now);
-#ifdef notdef
-		fprintf(stderr, "    tick\n");
-#endif notdef
-		/*
-		 * Handle any new connections; this comes first so
-		 * errno isn't tromped on.
-		 */
-		if (OP_DONE(listenop)) {
-			if (OP_STATUS(listenop) == OP_CANCELLED) {
-				if (errno == EWOULDBLOCK) {
-					do_reset_listen();
-				} else {
-					com_err(whoami, errno,
-						" error on listen");
-					exit(1);
-				}
-			} else if ((status = new_connection()) != 0) {
-				com_err(whoami, errno,
-					" Error on listening operation.");
-				/*
-				 * Sleep here to prevent hosing?
-				 */
-			}
-		}
-		/*
-		 * Handle any existing connections.
-		 */
-		tardy = now - 30*60;
-		
-		for (i=0; i<nclients; i++) {
-			cur_client = clients[i];
-			if (OP_DONE(clients[i]->pending_op)) {
-				cur_client->last_time_used = now;
-				do_client(cur_client);
-			} else if (clients[i]->last_time_used < tardy) {
-				com_err(whoami, 0, "Shutting down connection due to inactivity");
-				shutdown(cur_client->con->in.fd, 0);
-			}
-			cur_client = NULL;
-			if (takedown) break;
+      else if (dormant == GROGGY)
+	{
+	  mr_open_database();
+	  com_err(whoami, 0, "database open");
+	  mr_setup_signals();
+	  send_zgram("MOIRA", "database open again");
+	  dormant = AWAKE;
+	}
+
+      errno = 0;
+      status = op_select_any(op_list, 0, NULL, NULL, NULL, NULL);
+      if (status == -1)
+	{
+	  if (errno != EINTR)
+	    com_err(whoami, errno, " error from op_select");
+	  if (!inc_running || now - inc_started > INC_TIMEOUT)
+	    next_incremental();
+	  continue;
+	}
+      else if (status != -2)
+	{
+	  com_err(whoami, 0, " wrong return from op_select_any");
+	  continue;
+	}
+      if (takedown)
+	break;
+      time(&now);
+      if (!inc_running || now - inc_started > INC_TIMEOUT)
+	next_incremental();
+
+      /*
+       * Handle any new connections; this comes first so
+       * errno isn't tromped on.
+       */
+      if (OP_DONE(listenop))
+	{
+	  if (OP_STATUS(listenop) == OP_CANCELLED)
+	    {
+	      if (errno == EWOULDBLOCK)
+		do_reset_listen();
+	      else
+		{
+		  static int count = 0;
+		  com_err(whoami, errno, " error (%d) on listen", count);
+		  if (count++ > 10)
+		    exit(1);
 		}
+	    }
+	  else if ((status = new_connection()))
+	    {
+	      com_err(whoami, errno, " Error on listening operation.");
+	      /*
+	       * Sleep here to prevent hosing?
+	       */
+	    }
+	  /* if the new connection is our only connection,
+	   * and the server is supposed to be down, then go
+	   * down now.
+	   */
+	  if ((dormant == AWAKE) && (nclients == 1) &&
+	      (stat(MOIRA_MOTD_FILE, &stbuf) == 0))
+	    {
+	      com_err(whoami, 0, "motd file exists, slumbertime");
+	      dormant = SLEEPY;
+	    }
+	  /* on new connection, if we are no longer supposed
+	   * to be down, then wake up.
+	   */
+	  if ((dormant == ASLEEP) && (stat(MOIRA_MOTD_FILE, &stbuf) == -1) &&
+	      (errno == ENOENT))
+	    {
+	      com_err(whoami, 0, "motd file no longer exists, waking up");
+	      dormant = GROGGY;
+	    }
+	}
+      /*
+       * Handle any existing connections.
+       */
+      tardy = now - 30 * 60;
+
+      for (i = 0; i < nclients; i++)
+	{
+	  cur_client = clients[i];
+	  if (OP_DONE(clients[i]->pending_op))
+	    {
+	      cur_client->last_time_used = now;
+	      do_client(cur_client);
+	    }
+	  else if (clients[i]->last_time_used < tardy)
+	    {
+	      com_err(whoami, 0, "Shutting down connection due to inactivity");
+	      shutdown(cur_client->con->in.fd, 2);
+	    }
+	  cur_client = NULL;
+	  if (takedown)
+	    break;
 	}
-	com_err(whoami, 0, "%s", takedown);
-	sms_close_database();
-	send_zgram("SMS", takedown);
-	return 0;
+    }
+  com_err(whoami, 0, "%s", takedown);
+  if (dormant != ASLEEP)
+    mr_close_database();
+  send_zgram("MOIRA", takedown);
+  return 0;
 }
 
 /*
  * Set up the template connection and queue the first accept.
  */
 
-int
-do_listen()
+int do_listen(char *port)
 {
-	char *service = index(SMS_GDB_SERV, ':') + 1;
-
-	listencon = create_listening_connection(service);
+  listencon = create_listening_connection(port);
 
-	if (listencon == NULL)
-		return errno;
+  if (!listencon)
+    return errno;
 
-	listenop = create_operation();
-	client_addrlen = sizeof(client_addr);
+  listenop = create_operation();
+  client_addrlen = sizeof(client_addr);
 
-	start_accepting_client(listencon, listenop, &newconn,
-			       (char *)&client_addr,
-			       &client_addrlen, &client_tuple);
-	return 0;
+  start_accepting_client(listencon, listenop, &newconn, (char *)&client_addr,
+			 &client_addrlen, &client_tuple);
+  return 0;
 }
 
 
-do_reset_listen()
+void do_reset_listen(void)
 {
-	client_addrlen = sizeof(client_addr);
-	start_accepting_client(listencon, listenop, &newconn,
-			       (char *)&client_addr,
-			       &client_addrlen, &client_tuple);
+  client_addrlen = sizeof(client_addr);
+  start_accepting_client(listencon, listenop, &newconn, (char *)&client_addr,
+			 &client_addrlen, &client_tuple);
 }
 
 /*
@@ -263,129 +346,116 @@ do_reset_listen()
  *
  * It sets up a new client and adds it to the list of currently active clients.
  */
-int
-new_connection()
+int new_connection(void)
 {
-	register client *cp;
-	static counter = 0;
-	
-	/*
-	 * Make sure there's been no error
-	 */
-	if(OP_STATUS(listenop) != OP_COMPLETE) {
-		return errno;
-	}
-	
-	if (newconn == NULL) {
-		return SMS_NOT_CONNECTED;
-	}
-
-	/*
-	 * Set up the new connection and reply to the client
-	 */
-	cp = (client *)malloc(sizeof *cp);
-	bzero(cp, sizeof(*cp));
-	cp->state = CL_STARTING;
-	cp->action = CL_ACCEPT;
-	cp->con = newconn;
-	cp->id = counter++;
-	cp->args = NULL;
-	cp->clname = NULL;
-	cp->reply.sms_argv = NULL;
-	cp->first = NULL;
-	cp->last = NULL;
-	cp->last_time_used = now;
-	newconn = NULL;
-	
-	cp->pending_op = create_operation();
-	reset_operation(cp->pending_op);
-	oplist_append(&op_list, cp->pending_op);
-	cur_client = cp;
-	
-	/*
-	 * Add a new client to the array..
-	 */
-	clist_append(cp);
-	
-	/*
-	 * Let him know we heard him.
-	 */
-	start_replying_to_client(cp->pending_op, cp->con, GDB_ACCEPTED,
-				 "", "");
-
-	cp->haddr = client_addr;
-	
-	/*
-	 * Log new connection.
-	 */
-	
-	com_err(whoami, 0, "New connection from %s port %d (now %d client%s)",
-		inet_ntoa(cp->haddr.sin_addr),
-		(int)ntohs(cp->haddr.sin_port),
-		nclients,
-		nclients!=1?"s":"");
-	
-	/*
-	 * Get ready to accept the next connection.
-	 */
-	reset_operation(listenop);
-	client_addrlen = sizeof(client_addr);
-
-	start_accepting_client(listencon, listenop, &newconn,
-			       (char *)&client_addr,
-			       &client_addrlen, &client_tuple);
-	return 0;
+  client *cp;
+  static counter = 0;
+
+  /*
+   * Make sure there's been no error
+   */
+  if (OP_STATUS(listenop) != OP_COMPLETE)
+    return errno;
+
+  if (!newconn)
+    return MR_NOT_CONNECTED;
+
+  /*
+   * Set up the new connection and reply to the client
+   */
+  cp = malloc(sizeof(client));
+  memset(cp, 0, sizeof(*cp));
+  cp->action = CL_ACCEPT;
+  cp->con = newconn;
+  cp->id = counter++;
+  cp->args = NULL;
+  cp->clname[0] = NULL;
+  cp->reply.mr_argv = NULL;
+  cp->first = NULL;
+  cp->last = NULL;
+  cp->last_time_used = now;
+  newconn = NULL;
+
+  cp->pending_op = create_operation();
+  reset_operation(cp->pending_op);
+  oplist_append(&op_list, cp->pending_op);
+  cur_client = cp;
+
+  /*
+   * Add a new client to the array..
+   */
+  clist_append(cp);
+
+  /*
+   * Let him know we heard him.
+   */
+  start_replying_to_client(cp->pending_op, cp->con, GDB_ACCEPTED, "", "");
+
+  cp->haddr = client_addr;
+
+  /*
+   * Log new connection.
+   */
+  com_err(whoami, 0, "New connection from %s port %d (now %d client%s)",
+	  inet_ntoa(cp->haddr.sin_addr), (int)ntohs(cp->haddr.sin_port),
+	  nclients, nclients != 1 ? "s" : "");
+
+  /*
+   * Get ready to accept the next connection.
+   */
+  reset_operation(listenop);
+  client_addrlen = sizeof(client_addr);
+
+  start_accepting_client(listencon, listenop, &newconn, (char *)&client_addr,
+			 &client_addrlen, &client_tuple);
+  return 0;
 }
 
 /*
  * Add a new client to the known clients.
  */
-void
-clist_append(cp)
-	client *cp;
-{		
-	client **clients_n;
-	
-	nclients++;
-	clients_n = (client **)malloc
-		((unsigned)(nclients * sizeof(client *)));
-	bcopy((char *)clients, (char *)clients_n, (nclients-1)*sizeof(cp));
-	clients_n[nclients-1] = cp;
-	free((char *)clients);
-	clients = clients_n;
-	clients_n = NULL;
+void clist_append(client *cp)
+{
+  client **clients_n;
+
+  nclients++;
+  clients_n = malloc(nclients * sizeof(client *));
+  memcpy(clients_n, clients, (nclients - 1) * sizeof(cp));
+  clients_n[nclients - 1] = cp;
+  free(clients);
+  clients = clients_n;
+  clients_n = NULL;
 }
 
-		
-void
-clist_delete(cp)
-	client *cp;
+
+void clist_delete(client *cp)
 {
-	client **clients_n, **scpp, **dcpp; /* source and dest client */
-					    /* ptr ptr */
-	
-	int found_it = 0;
-	
-	clients_n = (client **)malloc
-		((unsigned)((nclients - 1)* sizeof(client *)));
-	for (scpp = clients, dcpp = clients_n; scpp < clients+nclients; ) {
-		if (*scpp != cp) {
-			*dcpp++ = *scpp++;
-		} else {
-			scpp++;
-			if (found_it) abort();
-			found_it = 1;
-		}			
+  client **clients_n, **scpp, **dcpp; /* source and dest client ptr ptr */
+
+  int found_it = 0;
+
+  clients_n = malloc((nclients - 1) * sizeof(client *));
+  for (scpp = clients, dcpp = clients_n; scpp < clients + nclients; )
+    {
+      if (*scpp != cp)
+	*dcpp++ = *scpp++;
+      else
+	{
+	  scpp++;
+	  if (found_it)
+	    abort();
+	  found_it = 1;
 	}
-	--nclients;	
-	free((char *)clients);
-	clients = clients_n;
-	clients_n = NULL;
-	oplist_delete(op_list, cp->pending_op);
-	reset_operation(cp->pending_op);
-	delete_operation(cp->pending_op);
-	sever_connection(cp->con);
-	free((char *)cp);
+    }
+  --nclients;
+  free(clients);
+  clients = clients_n;
+  clients_n = NULL;
+  oplist_delete(op_list, cp->pending_op);
+  reset_operation(cp->pending_op);
+  delete_operation(cp->pending_op);
+  sever_connection(cp->con);
+  free(cp);
 }
 
 /*
@@ -395,55 +465,129 @@ clist_delete(cp)
  * cases it won't have to copy the array.
  */
 
-void
-oplist_append(oplp, op)
-	LIST_OF_OPERATIONS *oplp;
-	OPERATION op;
+void oplist_append(LIST_OF_OPERATIONS *oplp, OPERATION op)
 {
-	int count = (*oplp)->count+1;
-	LIST_OF_OPERATIONS newlist = (LIST_OF_OPERATIONS)
-		db_alloc(size_of_list_of_operations(count));
-	bcopy((char *)(*oplp), (char *)newlist,
-	      size_of_list_of_operations((*oplp)->count));
-	newlist->count++;
-	newlist->op[count-1] = op;
-	db_free((char *)(*oplp), size_of_list_of_operations(count-1));
-	(*oplp) = newlist;
+  int count = (*oplp)->count + 1;
+  LIST_OF_OPERATIONS newlist = (LIST_OF_OPERATIONS)
+    db_alloc(size_of_list_of_operations(count));
+  memcpy(newlist, *oplp, size_of_list_of_operations((*oplp)->count));
+  newlist->count++;
+  newlist->op[count - 1] = op;
+  db_free(*oplp, size_of_list_of_operations(count - 1));
+  *oplp = newlist;
 }
 
-
-oplist_delete(oplp, op)
-	LIST_OF_OPERATIONS oplp;
-	register OPERATION op;
+void oplist_delete(LIST_OF_OPERATIONS oplp, OPERATION op)
 {
-	register OPERATION *s;
-	register int c;
-	
-	for (s = oplp->op, c=oplp->count; c; --c, ++s) {
-		if (*s == op) {
-			while (c > 0) {
-				*s = *(s+1);
-				++s;
-				--c;
-			}
-			oplp->count--;
-			return;
-		}
+  OPERATION *s;
+  int c;
+
+  for (s = oplp->op, c = oplp->count; c; --c, ++s)
+    {
+      if (*s == op)
+	{
+	  while (c > 0)
+	    {
+	      *s = *(s + 1);
+	      ++s;
+	      --c;
+	    }
+	  oplp->count--;
+	  return;
 	}
-	abort();
+    }
+  abort();
+}
+
+
+void reapchild(int x)
+{
+  int status, pid;
+
+  while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
+    {
+      if (pid == inc_pid)
+	inc_running = 0;
+      if (!takedown && (WTERMSIG(status) != 0 || WEXITSTATUS(status) != 0))
+	com_err(whoami, 0, "%d: child exits with signal %d status %d",
+		pid, WTERMSIG(status), WEXITSTATUS(status));
+    }
+}
+
+
+void godormant(int x)
+{
+  switch (dormant)
+    {
+    case AWAKE:
+    case GROGGY:
+      com_err(whoami, 0, "requested to go dormant");
+      break;
+    case ASLEEP:
+      com_err(whoami, 0, "already asleep");
+      break;
+    case SLEEPY:
+      break;
+    }
+  dormant = SLEEPY;
+}
+
+
+void gowakeup(int x)
+{
+  switch (dormant)
+    {
+    case ASLEEP:
+    case SLEEPY:
+      com_err(whoami, 0, "Good morning");
+      break;
+    case AWAKE:
+      com_err(whoami, 0, "already awake");
+      break;
+    case GROGGY:
+      break;
+    }
+  dormant = GROGGY;
 }
 
 
-void reapchild()
+void mr_setup_signals(void)
 {
-    union wait status;
-    int pid;
-
-    while ((pid = wait3(&status, WNOHANG, (struct rusage *)0)) > 0) {
-	if  (status.w_termsig == 0 && status.w_retcode == 0)
-	  com_err(whoami, 0, "dcm started successfully");
-	else
-	  com_err(whoami, 0, "%d: startdcm exits with signal %d status %d",
-		  pid, status.w_termsig, status.w_retcode);
+  struct sigaction action;
+
+  action.sa_flags = 0;
+  sigemptyset(&action.sa_mask);
+
+  /* There should probably be a few more of these. */
+
+  action.sa_handler = sigshut;
+  if ((sigaction(SIGTERM, &action, NULL) < 0) ||
+      (sigaction(SIGINT, &action, NULL) < 0) ||
+      (sigaction(SIGHUP, &action, NULL) < 0))
+    {
+      com_err(whoami, errno, "Unable to establish signal handlers.");
+      exit(1);
+    }
+
+  action.sa_handler = godormant;
+  if (sigaction(SIGUSR1, &action, NULL) < 0)
+    {
+      com_err(whoami, errno, "Unable to establish signal handlers.");
+      exit(1);
+    }
+
+  action.sa_handler = gowakeup;
+  if (sigaction(SIGUSR2, &action, NULL) < 0)
+    {
+      com_err(whoami, errno, "Unable to establish signal handlers.");
+      exit(1);
+    }
+
+  action.sa_handler = reapchild;
+  sigaddset(&action.sa_mask, SIGCHLD);
+  if (sigaction(SIGCHLD, &action, NULL) < 0)
+    {
+      com_err(whoami, errno, "Unable to establish signal handlers.");
+      exit(1);
     }
 }