[moira.git] / server / mr_main.c

/* $Id$
 *
 * Moira server process.
 *
 * Copyright (C) 1987-1998 by the Massachusetts Institute of Technology
 * For copying and distribution information, please see the file
 * <mit-copyright.h>.
 *
 */

#include <mit-copyright.h>
#include "mr_server.h"

#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include <sys/wait.h>

#include <netinet/in.h>
#include <arpa/inet.h>

#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <krb.h>
#include <krb5.h>

RCSID("$Header$");

client *cur_client;

char *whoami;
char *takedown;
FILE *journal;

time_t now;

char *host;
char krb_realm[REALM_SZ];
krb5_context context = NULL;

/* Client array and associated data. This needs to be global for _list_users */
client **clients;
int nclients, clientssize;

int dormant;
int child_exited_abnormally = 0;
int child_pid, child_signal, child_status;

void reapchild(int x);
void godormant(int x);
void gowakeup(int x);
void clist_append(client *cp);
void mr_setup_signals(void);

/*
 * Main Moira server loop.
 *
 * Initialize the world, then start accepting connections and
 * making progress on current connections.
 */

int main(int argc, char **argv)
{
  int status, i, listener;
  time_t tardy;
  char *port, *p;
  extern char *database;
  struct stat stbuf;
  struct utsname uts;
  fd_set readfds, writefds, xreadfds, xwritefds;
  int nfds, counter = 0;

  whoami = argv[0];
  /*
   * Error handler init.
   */
  mr_init();
  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++;
	}
      else if (!strcmp(argv[i], "-p") && i + 1 < argc)
	{
	  port = argv[i + 1];
	  i++;
	}
      else
	{
	  com_err(whoami, 0, "Usage: moirad [-db database][-p port]");
	  exit(1);
	}
    }

  krb_get_lrealm(krb_realm, 1);

  status = krb5_init_context(&context);
  if (status)
    {
      com_err(whoami, status, "Initializing krb5 context.");
      exit(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, "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 (uname(&uts) < 0)
    {
      com_err(whoami, errno, "Unable to get local hostname");
      exit(1);
    }
  host = canonicalize_hostname(xstrdup(uts.nodename));
  for (p = host; *p && *p != '.'; p++)
    {
      if (isupper(*p))
	*p = tolower(*p);
    }
  *p = '\0';

  /*
   * Set up client array handler.
   */
  nclients = 0;
  clientssize = 10;
  clients = xmalloc(clientssize * sizeof(client *));

  mr_setup_signals();

  journal = fopen(JOURNAL, "a");
  if (!journal)
    {
      com_err(whoami, errno, "opening journal file");
      exit(1);
    }

  /*
   * Establish template connection.
   */
  listener = mr_listen(port);
  if (listener == -1)
    {
      com_err(whoami, MR_ABORTED, "trying to create listening connection");
      exit(1);
    }
  FD_ZERO(&xreadfds);
  FD_ZERO(&xwritefds);
  FD_SET(listener, &xreadfds);
  nfds = listener + 1;

  com_err(whoami, 0, "started (pid %d)", getpid());
  com_err(whoami, 0, rcsid);
  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;
      struct timeval timeout = {60, 0}; /* 1 minute */

      /* If we're supposed to go down and we can, do it */
      if (((dormant == AWAKE) && (nclients == 0) &&
	   (stat(MOIRA_MOTD_FILE, &stbuf) == 0)) ||
	  (dormant == SLEEPY))
	{
	  mr_close_database();
	  com_err(whoami, 0, "database closed");
	  mr_setup_signals();
	  send_zgram("MOIRA", "database closed");
	  dormant = ASLEEP;
	}

      /* Block until something happens. */
      memcpy(&readfds, &xreadfds, sizeof(readfds));
      memcpy(&writefds, &xwritefds, sizeof(writefds));
      if (select(nfds, &readfds, &writefds, NULL, &timeout) == -1)
	{
	  if (errno != EINTR)
	    com_err(whoami, errno, "in select");
	  if (!inc_running || now - inc_started > INC_TIMEOUT)
	    next_incremental();
	  continue;
	}

      if (takedown)
	break;

      if (child_exited_abnormally)
	{
	  critical_alert("moirad", "%d: child exits with signal %d status %d",
			 child_pid, child_signal, child_status);
	  child_exited_abnormally = 0;
	}

      time(&now);
      if (!inc_running || now - inc_started > INC_TIMEOUT)
	next_incremental();
      tardy = now - 30 * 60;

      /* If we're asleep and we should wake up, do it */
      if ((dormant == ASLEEP) && (stat(MOIRA_MOTD_FILE, &stbuf) == -1) &&
	  (errno == ENOENT))
	{
	  mr_open_database();
	  com_err(whoami, 0, "database open");
	  mr_setup_signals();
	  send_zgram("MOIRA", "database open again");
	  dormant = AWAKE;
	}

      /* Handle any new connections */
      if (FD_ISSET(listener, &readfds))
	{
	  int newconn, addrlen = sizeof(struct sockaddr_in);
	  struct sockaddr_in addr;
	  client *cp;

	  newconn = accept(listener, (struct sockaddr *)&addr, &addrlen);
	  if (newconn == -1)
	    com_err(whoami, errno, "accepting new connection");
	  else if (newconn > 0)
	    {
	      if (newconn + 1 > nfds)
		nfds = newconn + 1;
	      FD_SET(newconn, &xreadfds);

	      /* Add a new client to the array */
	      nclients++;
	      if (nclients > clientssize)
		{
		  clientssize = 2 * clientssize;
		  clients = xrealloc(clients, clientssize * sizeof(client *));
		}

	      clients[nclients - 1] = cp = xmalloc(sizeof(client));
	      memset(cp, 0, sizeof(client));
	      cp->con = newconn;
	      cp->id = counter++;
	      cp->last_time_used = now;
	      cp->haddr = addr;
	      cp->tuplessize = 1;
	      cp->tuples = xmalloc(sizeof(mr_params));
	      memset(cp->tuples, 0, sizeof(mr_params));
	      cp->state = CL_ACCEPTING;
	      cp->version = 2;

	      cur_client = cp;
	      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" : "");
	    }
	}

      /* Handle any existing connections. */
      for (i = 0; i < nclients; i++)
	{
	  cur_client = clients[i];

	  if (FD_ISSET(clients[i]->con, &writefds))
	    {
	      client_write(clients[i]);
	      if (!clients[i]->ntuples)
		{
		  FD_CLR(clients[i]->con, &xwritefds);
		  FD_SET(clients[i]->con, &xreadfds);
		}
	      clients[i]->last_time_used = now;
	    }

	  if (FD_ISSET(clients[i]->con, &readfds))
	    {
	      if (clients[i]->state == CL_ACCEPTING)
		{
		  switch(mr_cont_accept(clients[i]->con,
					&clients[i]->hsbuf,
					&clients[i]->hslen))
		    {
		    case -1:
		      break;

		    case 0:
		      clients[i]->state = CL_CLOSING;
		      break;

		    default:
		      clients[i]->state = CL_ACTIVE;
		      clients[i]->hsbuf = NULL;
		      break;
		    }
		}
	      else
		{
		  client_read(clients[i]);
		  if (clients[i]->ntuples)
		    {
		      FD_CLR(clients[i]->con, &xreadfds);
		      FD_SET(clients[i]->con, &xwritefds);
		    }
		  clients[i]->last_time_used = now;
		}
	    }

	  if (clients[i]->last_time_used < tardy)
	    {
	      com_err(whoami, 0, "Shutting down connection due to inactivity");
	      clients[i]->state = CL_CLOSING;
	    }

	  if (clients[i]->state == CL_CLOSING)
	    {
	      client *old;

	      com_err(whoami, 0, "Closed connection (now %d client%s, "
		      "%d queries)", nclients - 1, nclients != 2 ? "s" : "",
		      newqueries);

	      shutdown(clients[i]->con, 2);
	      close(clients[i]->con);
	      FD_CLR(clients[i]->con, &xreadfds);
	      FD_CLR(clients[i]->con, &xwritefds);
	      free_rtn_tuples(clients[i]);
	      free(clients[i]->tuples);
	      free(clients[i]->hsbuf);
	      old = clients[i];
	      clients[i] = clients[--nclients];
	      free(old);
	    }

	  cur_client = NULL;
	  if (takedown)
	    break;
	}
    }

  com_err(whoami, 0, "%s", takedown);
  if (dormant != ASLEEP)
    mr_close_database();
  send_zgram("MOIRA", takedown);
  return 0;
}

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))
	{
	  child_exited_abnormally = 1;
	  child_pid = pid;
	  child_signal = WTERMSIG(status);
	  child_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 mr_setup_signals(void)
{
  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 = SIG_IGN;
  if (sigaction(SIGPIPE, &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);
    }
}
Commit	Line	Data
7ac48069	1	/* $Id$
0fa91a0a	2	*
7ac48069	3	* Moira server process.
0fa91a0a	4	*
7ac48069	5	* Copyright (C) 1987-1998 by the Massachusetts Institute of Technology
	6	* For copying and distribution information, please see the file
	7	* <mit-copyright.h>.
5eaef520	8	*
0fa91a0a	9	*/
0fa91a0a	10
c801de4c	11	#include <mit-copyright.h>
7ac48069	12	#include "mr_server.h"
	13
	14	#include <sys/socket.h>
	15	#include <sys/stat.h>
589993be	16	#include <sys/types.h>
7ac48069	17	#include <sys/utsname.h>
554776b1	18	#include <sys/wait.h>
7ac48069	19
7ac48069	20	#include <netinet/in.h>
03c05291	21	#include <arpa/inet.h>
70d54e43	22
7ac48069	23	#include <ctype.h>
	24	#include <errno.h>
	25	#include <signal.h>
	26	#include <stdio.h>
	27	#include <stdlib.h>
	28	#include <string.h>
	29	#include <unistd.h>
	30
85330553	31	#include <krb.h>
991417e4	32	#include <krb5.h>
85330553	33
7ac48069	34	RCSID("$Header$");
7ac48069	35
85330553	36	client *cur_client;
0fa91a0a	37
85330553	38	char *whoami;
	39	char *takedown;
	40	FILE *journal;
0fa91a0a	41
85330553	42	time_t now;
0fa91a0a	43
85330553	44	char *host;
85330553	45	char krb_realm[REALM_SZ];
991417e4	46	krb5_context context = NULL;
70d54e43	47
85330553	48	/* Client array and associated data. This needs to be global for _list_users */
	49	client **clients;
	50	int nclients, clientssize;
0eb9f52f	51
85330553	52	int dormant;
9af63f7e	53	int child_exited_abnormally = 0;
9af63f7e	54	int child_pid, child_signal, child_status;
3d0d0f07	55
7ac48069	56	void reapchild(int x);
	57	void godormant(int x);
	58	void gowakeup(int x);
03c05291	59	void clist_append(client *cp);
03c05291	60	void mr_setup_signals(void);
e448f08d	61
0ec57336	62	/*
59ec8dae	63	* Main Moira server loop.
0ec57336	64	*
	65	* Initialize the world, then start accepting connections and
	66	* making progress on current connections.
	67	*/
0fa91a0a	68
5eaef520	69	int main(int argc, char **argv)
0fa91a0a	70	{
85330553	71	int status, i, listener;
5eaef520	72	time_t tardy;
	73	char port, p;
	74	extern char *database;
	75	struct stat stbuf;
7ac48069	76	struct utsname uts;
85330553	77	fd_set readfds, writefds, xreadfds, xwritefds;
85330553	78	int nfds, counter = 0;
5eaef520	79
	80	whoami = argv[0];
	81	/*
	82	* Error handler init.
	83	*/
85330553	84	mr_init();
5eaef520	85	set_com_err_hook(mr_com_err);
	86	setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
	87
	88	port = strchr(MOIRA_SERVER, ':') + 1;
	89
	90	for (i = 1; i < argc; i++)
	91	{
	92	if (!strcmp(argv[i], "-db") && i + 1 < argc)
	93	{
	94	database = argv[i + 1];
	95	i++;
5dbd09a0	96	}
5eaef520	97	else if (!strcmp(argv[i], "-p") && i + 1 < argc)
	98	{
	99	port = argv[i + 1];
	100	i++;
f6cc38de	101	}
5eaef520	102	else
	103	{
	104	com_err(whoami, 0, "Usage: moirad [-db database][-p port]");
3d0d0f07	105	exit(1);
3d0d0f07	106	}
5eaef520	107	}
5eaef520	108
5eaef520	109	krb_get_lrealm(krb_realm, 1);
5eaef520	110
991417e4	111	status = krb5_init_context(&context);
	112	if (status)
	113	{
	114	com_err(whoami, status, "Initializing krb5 context.");
	115	exit(1);
	116	}
	117
5eaef520	118	/*
	119	* Database initialization. Only init if database should be open.
	120	*/
	121
	122	if (stat(MOIRA_MOTD_FILE, &stbuf) != 0)
	123	{
	124	if ((status = mr_open_database()))
	125	{
85330553	126	com_err(whoami, status, "trying to open database.");
5eaef520	127	exit(1);
2f4ff9cd	128	}
5eaef520	129	sanity_check_database();
	130	}
	131	else
	132	{
	133	dormant = ASLEEP;
	134	com_err(whoami, 0, "sleeping, not opening database");
	135	}
2f4ff9cd	136
5eaef520	137	sanity_check_queries();
	138
	139	/*
	140	* Get moira server hostname for authentication
	141	*/
7ac48069	142	if (uname(&uts) < 0)
5eaef520	143	{
	144	com_err(whoami, errno, "Unable to get local hostname");
	145	exit(1);
	146	}
e688520a	147	host = canonicalize_hostname(xstrdup(uts.nodename));
5eaef520	148	for (p = host; p && p != '.'; p++)
	149	{
	150	if (isupper(*p))
	151	p = tolower(p);
	152	}
	153	*p = '\0';
	154
	155	/*
	156	* Set up client array handler.
	157	*/
	158	nclients = 0;
85330553	159	clientssize = 10;
e688520a	160	clients = xmalloc(clientssize * sizeof(client *));
5eaef520	161
	162	mr_setup_signals();
	163
	164	journal = fopen(JOURNAL, "a");
	165	if (!journal)
	166	{
85330553	167	com_err(whoami, errno, "opening journal file");
5eaef520	168	exit(1);
	169	}
	170
	171	/*
	172	* Establish template connection.
	173	*/
da6a4096	174	listener = mr_listen(port);
da6a4096	175	if (listener == -1)
5eaef520	176	{
93ba0dea	177	com_err(whoami, MR_ABORTED, "trying to create listening connection");
5eaef520	178	exit(1);
5eaef520	179	}
85330553	180	FD_ZERO(&xreadfds);
	181	FD_ZERO(&xwritefds);
	182	FD_SET(listener, &xreadfds);
	183	nfds = listener + 1;
5eaef520	184
5eaef520	185	com_err(whoami, 0, "started (pid %d)", getpid());
7ac48069	186	com_err(whoami, 0, rcsid);
5eaef520	187	if (dormant != ASLEEP)
	188	send_zgram("MOIRA", "server started");
	189	else
	190	send_zgram("MOIRA", "server started, but database closed");
	191
	192	/*
	193	* Run until shut down.
	194	*/
	195	while (!takedown)
	196	{
44d12d58	197	int i;
9294e804	198	struct timeval timeout = {60, 0}; /* 1 minute */
85330553	199
85330553	200	/* If we're supposed to go down and we can, do it */
59ad5a76	201	if (((dormant == AWAKE) && (nclients == 0) &&
	202	(stat(MOIRA_MOTD_FILE, &stbuf) == 0)) \|\|
	203	(dormant == SLEEPY))
5eaef520	204	{
	205	mr_close_database();
	206	com_err(whoami, 0, "database closed");
	207	mr_setup_signals();
	208	send_zgram("MOIRA", "database closed");
	209	dormant = ASLEEP;
	210	}
589993be	211
85330553	212	/* Block until something happens. */
	213	memcpy(&readfds, &xreadfds, sizeof(readfds));
	214	memcpy(&writefds, &xwritefds, sizeof(writefds));
9294e804	215	if (select(nfds, &readfds, &writefds, NULL, &timeout) == -1)
5eaef520	216	{
5eaef520	217	if (errno != EINTR)
85330553	218	com_err(whoami, errno, "in select");
5eaef520	219	if (!inc_running \|\| now - inc_started > INC_TIMEOUT)
	220	next_incremental();
	221	continue;
	222	}
85330553	223
5eaef520	224	if (takedown)
5eaef520	225	break;
9af63f7e	226
	227	if (child_exited_abnormally)
	228	{
	229	critical_alert("moirad", "%d: child exits with signal %d status %d",
	230	child_pid, child_signal, child_status);
	231	child_exited_abnormally = 0;
	232	}
	233
5eaef520	234	time(&now);
	235	if (!inc_running \|\| now - inc_started > INC_TIMEOUT)
	236	next_incremental();
85330553	237	tardy = now - 30 * 60;
	238
	239	/* If we're asleep and we should wake up, do it */
	240	if ((dormant == ASLEEP) && (stat(MOIRA_MOTD_FILE, &stbuf) == -1) &&
	241	(errno == ENOENT))
	242	{
	243	mr_open_database();
	244	com_err(whoami, 0, "database open");
	245	mr_setup_signals();
	246	send_zgram("MOIRA", "database open again");
	247	dormant = AWAKE;
	248	}
5eaef520	249
85330553	250	/* Handle any new connections */
85330553	251	if (FD_ISSET(listener, &readfds))
5eaef520	252	{
8691463b	253	int newconn, addrlen = sizeof(struct sockaddr_in);
85330553	254	struct sockaddr_in addr;
	255	client *cp;
	256
8691463b	257	newconn = accept(listener, (struct sockaddr *)&addr, &addrlen);
85330553	258	if (newconn == -1)
	259	com_err(whoami, errno, "accepting new connection");
	260	else if (newconn > 0)
5eaef520	261	{
85330553	262	if (newconn + 1 > nfds)
	263	nfds = newconn + 1;
	264	FD_SET(newconn, &xreadfds);
	265
	266	/* Add a new client to the array */
	267	nclients++;
	268	if (nclients > clientssize)
5eaef520	269	{
85330553	270	clientssize = 2 * clientssize;
85330553	271	clients = xrealloc(clients, clientssize * sizeof(client *));
0fa91a0a	272	}
85330553	273
	274	clients[nclients - 1] = cp = xmalloc(sizeof(client));
	275	memset(cp, 0, sizeof(client));
	276	cp->con = newconn;
	277	cp->id = counter++;
	278	cp->last_time_used = now;
	279	cp->haddr = addr;
	280	cp->tuplessize = 1;
	281	cp->tuples = xmalloc(sizeof(mr_params));
	282	memset(cp->tuples, 0, sizeof(mr_params));
8691463b	283	cp->state = CL_ACCEPTING;
c44ddfa7	284	cp->version = 2;
85330553	285
	286	cur_client = cp;
	287	com_err(whoami, 0,
	288	"New connection from %s port %d (now %d client%s)",
	289	inet_ntoa(cp->haddr.sin_addr),
	290	(int)ntohs(cp->haddr.sin_port),
	291	nclients, nclients != 1 ? "s" : "");
5eaef520	292	}
0fa91a0a	293	}
5eaef520	294
85330553	295	/* Handle any existing connections. */
5eaef520	296	for (i = 0; i < nclients; i++)
	297	{
	298	cur_client = clients[i];
85330553	299
	300	if (FD_ISSET(clients[i]->con, &writefds))
	301	{
	302	client_write(clients[i]);
	303	if (!clients[i]->ntuples)
	304	{
	305	FD_CLR(clients[i]->con, &xwritefds);
85330553	306	FD_SET(clients[i]->con, &xreadfds);
	307	}
	308	clients[i]->last_time_used = now;
	309	}
	310
	311	if (FD_ISSET(clients[i]->con, &readfds))
5eaef520	312	{
8691463b	313	if (clients[i]->state == CL_ACCEPTING)
	314	{
	315	switch(mr_cont_accept(clients[i]->con,
	316	&clients[i]->hsbuf,
	317	&clients[i]->hslen))
	318	{
	319	case -1:
	320	break;
	321
	322	case 0:
	323	clients[i]->state = CL_CLOSING;
	324	break;
	325
	326	default:
	327	clients[i]->state = CL_ACTIVE;
	328	clients[i]->hsbuf = NULL;
	329	break;
	330	}
	331	}
	332	else
	333	{
	334	client_read(clients[i]);
	335	if (clients[i]->ntuples)
	336	{
	337	FD_CLR(clients[i]->con, &xreadfds);
	338	FD_SET(clients[i]->con, &xwritefds);
	339	}
	340	clients[i]->last_time_used = now;
	341	}
5eaef520	342	}
85330553	343
85330553	344	if (clients[i]->last_time_used < tardy)
5eaef520	345	{
5eaef520	346	com_err(whoami, 0, "Shutting down connection due to inactivity");
8691463b	347	clients[i]->state = CL_CLOSING;
85330553	348	}
85330553	349
8691463b	350	if (clients[i]->state == CL_CLOSING)
85330553	351	{
	352	client *old;
	353
	354	com_err(whoami, 0, "Closed connection (now %d client%s, "
	355	"%d queries)", nclients - 1, nclients != 2 ? "s" : "",
	356	newqueries);
	357
	358	shutdown(clients[i]->con, 2);
	359	close(clients[i]->con);
	360	FD_CLR(clients[i]->con, &xreadfds);
	361	FD_CLR(clients[i]->con, &xwritefds);
92ced3ed	362	free_rtn_tuples(clients[i]);
85330553	363	free(clients[i]->tuples);
8691463b	364	free(clients[i]->hsbuf);
85330553	365	old = clients[i];
	366	clients[i] = clients[--nclients];
	367	free(old);
5eaef520	368	}
85330553	369
5eaef520	370	cur_client = NULL;
	371	if (takedown)
	372	break;
	373	}
	374	}
85330553	375
5eaef520	376	com_err(whoami, 0, "%s", takedown);
	377	if (dormant != ASLEEP)
	378	mr_close_database();
	379	send_zgram("MOIRA", takedown);
	380	return 0;
70d54e43	381	}
70d54e43	382
5eaef520	383	void reapchild(int x)
554776b1	384	{
5eaef520	385	int status, pid;
	386
	387	while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
	388	{
	389	if (pid == inc_pid)
	390	inc_running = 0;
	391	if (!takedown && (WTERMSIG(status) != 0 \|\| WEXITSTATUS(status) != 0))
71c89283	392	{
9af63f7e	393	child_exited_abnormally = 1;
	394	child_pid = pid;
	395	child_signal = WTERMSIG(status);
	396	child_status = WEXITSTATUS(status);
71c89283	397	}
554776b1	398	}
554776b1	399	}
589993be	400
589993be	401
5eaef520	402	void godormant(int x)
589993be	403	{
5eaef520	404	switch (dormant)
5eaef520	405	{
589993be	406	case AWAKE:
589993be	407	case GROGGY:
5eaef520	408	com_err(whoami, 0, "requested to go dormant");
5eaef520	409	break;
589993be	410	case ASLEEP:
5eaef520	411	com_err(whoami, 0, "already asleep");
5eaef520	412	break;
589993be	413	case SLEEPY:
5eaef520	414	break;
589993be	415	}
5eaef520	416	dormant = SLEEPY;
589993be	417	}
	418
	419
5eaef520	420	void gowakeup(int x)
589993be	421	{
5eaef520	422	switch (dormant)
5eaef520	423	{
589993be	424	case ASLEEP:
589993be	425	case SLEEPY:
5eaef520	426	com_err(whoami, 0, "Good morning");
5eaef520	427	break;
589993be	428	case AWAKE:
5eaef520	429	com_err(whoami, 0, "already awake");
5eaef520	430	break;
589993be	431	case GROGGY:
5eaef520	432	break;
589993be	433	}
5eaef520	434	dormant = GROGGY;
589993be	435	}
083a6e94	436
5eaef520	437
03c05291	438	void mr_setup_signals(void)
083a6e94	439	{
5eaef520	440	struct sigaction action;
	441
	442	action.sa_flags = 0;
	443	sigemptyset(&action.sa_mask);
03c05291	444
5eaef520	445	/* There should probably be a few more of these. */
03c05291	446
5eaef520	447	action.sa_handler = sigshut;
	448	if ((sigaction(SIGTERM, &action, NULL) < 0) \|\|
	449	(sigaction(SIGINT, &action, NULL) < 0) \|\|
	450	(sigaction(SIGHUP, &action, NULL) < 0))
	451	{
03c05291	452	com_err(whoami, errno, "Unable to establish signal handlers.");
03c05291	453	exit(1);
083a6e94	454	}
e448f08d	455
5eaef520	456	action.sa_handler = godormant;
	457	if (sigaction(SIGUSR1, &action, NULL) < 0)
	458	{
03c05291	459	com_err(whoami, errno, "Unable to establish signal handlers.");
	460	exit(1);
	461	}
e448f08d	462
5eaef520	463	action.sa_handler = gowakeup;
	464	if (sigaction(SIGUSR2, &action, NULL) < 0)
	465	{
03c05291	466	com_err(whoami, errno, "Unable to establish signal handlers.");
	467	exit(1);
	468	}
e448f08d	469
44762a3f	470	action.sa_handler = SIG_IGN;
	471	if (sigaction(SIGPIPE, &action, NULL) < 0)
	472	{
	473	com_err(whoami, errno, "Unable to establish signal handlers.");
	474	exit(1);
	475	}
	476
5eaef520	477	action.sa_handler = reapchild;
	478	sigaddset(&action.sa_mask, SIGCHLD);
	479	if (sigaction(SIGCHLD, &action, NULL) < 0)
	480	{
03c05291	481	com_err(whoami, errno, "Unable to establish signal handlers.");
	482	exit(1);
	483	}
	484	}