/* PROGRAM:	eggsh
 * FILE:	$Header: /home/egg/src/RCS/egg.c,v 1.8 1999/02/28 20:01:43 ghn Exp $
 * PURPOSE:	EGG site data collection
 * AUTHOR:	Greg Nelson
 * DATE:	98-06-20
 *
 * REVISED:
 * $Log: egg.c,v $
 * Revision 1.8  1999/02/28 20:01:43  ghn
 * Version 5.1: Added command line parsing for interface/port configuration.
 * Changed default interface to 0.0.0.0, so that egg will normally bind to
 * all incoming interfaces.  Reports interface/port it is using, right before
 * the screen gets cleared and you can't see it.
 *
 * Revision 1.7  1999/01/01 23:57:20  ghn
 * Remove excess code associated with CPU-bound version and "OLDWAY" UI
 * and egg HW selection. Add back in updated block algorithm description.
 * Allow non-CPU-bound version to exchange more than 1 packet per second.
 * Get rid of warnings when network is not reachable, assuming this is a
 * transient error.
 *
 * Revision 1.6  1998/12/31 22:07:56  ghn
 * Rev 5 code: includes multi-reg support, HTML, etc.
 *
 * Revision 1.5  1998/08/03 20:35:55  kelvin
 * PACKETDUMP support.
 * 
 * Revision 1.4  1998/08/01  21:34:26  ghn
 * Connected user interface and added PSEUDO suppor into main line.
 *
 * Revision 1.3  1998/08/01 18:51:25  ghn
 * Added John's byte-order-independence changes.
 * 
 * Revision 1.2  1998/08/01 17:04:26  ghn
 * Lots of fixes from John, plus DND support.
 * 
 * Revision 1.1  1998/07/21 11:41:35  ghn
 * Initial revision
 * 
 * Copyright 1998 - Greg Nelson
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>

#include "global.h"
#include "genlib.h"
#include "storage.h"
#include "network.h"
#include "eggui.h"
#include "errnos.h"
#include "regs.h"
#include "regtable.h"
#include "version.h"

/* Good old Linux doesn't define the following functions
   by default in the #include files the manual page claims
   it does, and the conditional declarations with __USE_xx
   doesn't work.  Explicitly declare them, which doesn't
   seem to do any harm on systems where these functions are
   properly declared.  If you get errors on the following
   declarations, you can probably get around them by #ifdef-ing
   the declarations off for your platform. */

extern int nice(int inc);
extern int strcasecmp(const char *s1, const char *s2);

/*  Prototypes for forward functions.  */

static void MakeAwake(AwakePacket *pkt);
static void MakeDataPkt(char **pkt, EggCarton *src);
static void LoadRCFile(char *filename);
static double SetCollOpts(void);
static int GreetBasket(void);
static void handle_sigkill(int arg), handle_sighup(int arg);

EggEntry eggtable[MAX_EGGS];
BasketEntry baskettable[MAX_BASKETS];
EggHeader protocol;
REG_driver *configuredREG = NULL;     /* Configured REG driver */

short numeggs = 0, numbaskets = 0;

static DevOpts devopts; 	      /* Device options for REG */
static CollectRecord coll;
static EggCarton savebuffer;
char	*pgmname;		      /* Program name from argv[0] */
char	*myaddr;		      /* Interface to bind */
int16	myport;			      /* Service port to bind */
int32 lastDataSent = 0; 	      /* Time last packet sent to basket */

/* If no priority increment has been specified at compile time, set to
   our default of 10. [+/- 10, for folks without 8bit editors] */

#ifndef NICE
#define NICE	10
#endif
static int niceness = NICE;	      /* Priority increment/decrement for collection */

/* Status exported to user interface. */

int32 time_latency = 0, time_housekeeping = 0;

#ifdef ALT_UI
static double mean_Packet = 0.0, mean_Grand = 0.0;
static int32 total_Packets = 0;
#endif

/*  resetCarton  --  Clear existing data from savebuffer and
		     reinitialise for a sampling interval
		     beginning at the specified start_time.  */

static void resetCarton(uint32 start_time)
{
    int i;
    uint32 sec_pkt;

    /* Save current collection options to packet. */

    memcpy(&(savebuffer.hdr), &(coll.opts), sizeof(EggHeader));

    /* Set number of records in packet and clear record
       buffers to missing data. */

    savebuffer.hdr.numrec = savebuffer.hdr.rec_pkt; /* Mark all records present */

    /* Align start_time to even multiple of seconds per
       packet. */

    sec_pkt = savebuffer.hdr.sec_rec * savebuffer.hdr.rec_pkt;
    start_time = sec_pkt * (start_time / sec_pkt);

    for (i = 0; i < savebuffer.hdr.rec_pkt; i++) {
	savebuffer.records[i].timestamp = start_time;
	start_time += savebuffer.hdr.sec_rec;
#if MAXBITS < 256
	memset(savebuffer.records[i].trials, EGG_MISSING_DATA, MAXSAMP_REC);
#else
#error "Can't represent MAXBITS in a byte value."
#endif
    }
}

/*  saveProtocol  --  Save current protocol in the .eggprotocolrc file.  */

static void saveProtocol(void)
{
    FILE *rcfile;

    rcfile = fopen(".eggprotocolrc", "w");
    if (rcfile == NULL) {
        fprintf(stderr, "%s: Cannot create .eggprotocolrc file.\n", pgmname);
	exit(-1);
    }
    fprintf(rcfile, "#\n#  Current protocol for egg\n#\n");
    fprintf(rcfile, "#   PROTOCOL <samp_rec> <sec_rec> <rec_pkt> <trialsz>\n");
    fprintf(rcfile, "PROTOCOL %d %d %d %d\n", protocol.samp_rec, protocol.sec_rec,
	protocol.rec_pkt, protocol.trialsz);
    fclose(rcfile);
}

static void Usage(void) {
  printf("Usage: %s [-i interface] [-p port]\n", pgmname);
  exit(-1);
}

/*  Main program.  */

int main(int argc, char *argv[]) {
  char			*pktbuf, *outpktbuf;
  uint16		pkttype, pktsize;
  int			sdlisten, res;
  struct sockaddr_in	rhost;
  EggCarton		retrcart;
  int			i, isbasket;
  char			*remname;
  int32 		lastconn, lastsend;
  double		sps;
#ifdef SIGACTION_WORKING
  struct sigaction	sigact;
#endif
  FILE *pidfile, *rcfile;

  pgmname = argv[0];
  argv++; argc--;

  /* Defaults correspond to original usage */
  myport = EGGPORT;
  myaddr = "0.0.0.0";

  while (argc) {
    if (argv[0][0] == '-') {
      switch(argv[0][1]) {
      case 'i':	/* Specify interface */
	if (argc < 2) Usage();
	myaddr = argv[1];
	argv++; argc--;
	break;
      case 'p':	/* Specify port */
	if (argc < 2) Usage();
	myport = atoi(argv[1]);
	if (myport < 0) Usage();
	argv++; argc--;
	break;
      default:	/* Oops. */
	Usage();
      }
    } else {
      Usage();
    }
    argv++; argc--;
  }

#ifdef Solaris
  /* Solaris has an eccentric definition of sigaction() which
     doesn't seem to even work according to Sun's own
     documentation.  (sa_flags is a 4 element array of
     unsigned longs, with no mention of how one stores the
     flags into it.)  Let's just use plain old signal for
     the moment. */
  signal(SIGKILL, handle_sigkill);
  signal(SIGHUP, handle_sighup);
#else
#ifdef SIGACTION_WORKING
  sigact.sa_handler = handle_sigkill;
  sigact.sa_mask = 0;
  sigact.sa_flags = 0;
  sigact.sa_restorer = NULL;
  sigaction(SIGKILL, &sigact, NULL);

  sigact.sa_handler = handle_sighup;
  sigaction(SIGHUP, &sigact, NULL);
#else
  signal(SIGKILL, handle_sigkill);
  signal(SIGHUP, handle_sighup);
#endif
#endif

  fprintf(stderr, "Starting egg %s.\n", Version);

  /* Save our process ID in a file for folks who might wish
     to send us a signal. */

  pidfile = fopen("eggsample.pid", "w");
  if (pidfile == NULL) {
    fprintf(stderr, "Unable to create eggsample.pid file.\n");
    exit(-1);
  }
  fprintf(pidfile, "%d\n", getpid());
  fclose(pidfile);

  /* If we aren't being run by the super-user, disable the
     priority raising and lowering mechanism. */

  if (getuid() != 0) {
    niceness = 0;
  }

#ifdef DEBUG
  printf("User ID = %d.  Niceness = %d.\n", getuid(), niceness);
  printf("REG drivers installed: ");
  for (i = 0; reg_table[i] != NULL; i++) {
    printf(" %s", reg_table[i]->reg_name);
  }
  printf("\n");
#endif

  LoadRCFile(NULL);

  /* If an auxiliary configuration file exists, load it on
     top of the arguments loaded from the main RC file.  If
     it doesn't exist, create it. */

  if ((rcfile = fopen(".eggprotocolrc", "r")) != NULL) {
    fclose(rcfile);
    LoadRCFile(".eggprotocolrc");
  } else {
    saveProtocol();
  }

  if (configuredREG == NULL) {
    fprintf(stderr, "%s: RC error, no REG specified for egg.\n",
	pgmname);
    exit(-1);
  }
#ifdef DEBUG
    else {
    printf("REG configured: %s = %d, %d, %ld\n", configuredREG ->reg_name,
	devopts.type, devopts.port, devopts.baud);
  }
#endif


  sps = SetCollOpts();

  if ((coll.dd = OpenDev(&devopts)) < 0) {
    fprintf(stderr, "Couldn't talk to hardware device.\n");
    exit(1);
  }

  if (EvalSpeed(coll.dd) < coll.opts.trialsz * sps) {
    fprintf(stderr, "Requested speed exceeds device capabilities.\n");
    exit(-1);
  }

#if REPORT > 0
  if (myaddr) {
    fprintf(stderr, "TCP configured: %s.%d\n", myaddr, myport);
  } else {
    fprintf(stderr, "TCP configured: hostname.%d\n", myport);
  }
#endif

  UIInit();

  sdlisten = -1;	/* No conn yet. */
  lastconn = lastsend = 0;

  /* Initialise carton to zero time, indicating no data in
     initial carton. */
  resetCarton(0);

  /* Initialize storage system */
  InitStorage("%Y-%m/%Y-%m-%d-$06E");

  /* Inner loop is currently two threads which are both processed
     together through NBIO.

     2A. Adjust priority and sleep until time computed below (2H).
     2B. Busy wait until second ticks over.
     2C. Empty REG input buffer (if needed), then collect sample.
     2D. Lower priority to handle bookkeeping; save packet.
     2E. Update user interface.

     2F. Send awake packet if connival is passed.
     2G. [DND only] Put net to sleep if we've been waiting more than a minute

     1A. Wait for connection.  When a connection comes in,
	 packet has been decrypted and verified.
     1B. Validate connection.
     1C. Reply to connection.
     1D. If we have more than MINSLEEP time left in second,
         go back to 1A.

     2H. Compute new sleep time.
  */

  while (1) {
    static int sleeptime = 0;
    static struct timeval t, lt = {0, 0};
    struct timeval ct;
    trial sample;
    int havedata;
    uint32 rindex;
#ifdef DEBUG
    uint32 msec, usec;
#endif

#ifndef SLACK
#define SLACK	50000		      /* CPU loop resynchronisation time in microseconds */
#endif

#ifndef	MINSLEEP
#define MINSLEEP	100000		/* Minimum sleep time, usec */
#endif

    /* 2A. If we have successfully computed a sleep time until
       the window opens to collect the next sample, give up
       the CPU until that time arrives. */

    if (niceness != 0) {
	nice(-niceness);	      /* Raise priority for re-dispatch */
    }
    if (sleeptime > 0) {
	Usleep((unsigned) sleeptime);
    }

    /* 2B. We're now close to the start of the next second.  Watch the
       time until the second changes, then collect the next sample.
       Note that this method of doing things enforces the one
       sample/second that has become standard practise.  The code at
       the bottom of the loop could be changed to allow for a longer
       interval, but this code enforces a minimum of a 1-second change
       for each sample. */

    while (1) {
      gettimeofday(&t, NULL);
      if (lt.tv_sec == 0) lt.tv_sec = t.tv_sec;
      if (t.tv_sec != lt.tv_sec) break;
    }

    /* 2C. It is now time to collect the next sample.  Discard any
       any data in the input queue and get the sample.	*/

    Discard(coll.dd);
    sample = Sample(coll.dd, coll.opts.trialsz);
    if (niceness != 0) {
      nice(niceness); 	      /* Collection done.  Lower priority to normal. */
    }

    /* 2D. Okay, we're now in "quality time"--the slack after collection
       of a sample until the time for the next sample arrives.
       Now is an excellent time to do all kinds of housekeeping.
       First of all, see if the sample just collected fits into
       the packet currently being assembled.  If not, we need to
       save the last packet in the egg data file and initialise
       a new packet for the time period in which this sample was
       collected. */

    if ((savebuffer.records[0].timestamp == 0) ||
	((savebuffer.records[0].timestamp +
	  (savebuffer.hdr.sec_rec * savebuffer.hdr.rec_pkt)) <= t.tv_sec)) {

      if (savebuffer.records[0].timestamp != 0) {
	static int firstpacket = 1;
#ifdef ALT_UI
	int r, t;
	uint32 ptrials = 0, psum = 0;
	static uint32 totalTrials = 0;
	static double totalGrand = 0.0;
#endif

	/* Sample isn't within current packet.  Dump packet to the egg
	   data file and reinitialise to the window containing the
	   sample we just collected.  But first, a little gimmick.  If
	   this is the first packet we've collected and it contains
	   one or more missing samples at the beginning, discard it.
	   This keeps the routine missing samples in the first packet
	   after the egg starts up from being reported as missing
	   samples due to genuine synchronisation errors. */

	if (!(firstpacket && (savebuffer.records[0].trials[0] == EGG_MISSING_DATA))) {
	  SavePacket(&savebuffer);
	}
#ifdef DEBUG
	else {
	  fprintf(stderr, "Dropping first packet to discard start-up missing samples.\n");
	}
#endif
	firstpacket = 0;

#ifdef ALT_UI
	/* Update the last packet and grand mean data for the debug
	   interface status display. */

	for (r = 0; r < savebuffer.hdr.rec_pkt; r++) {
	  for (t = 0; t < savebuffer.hdr.samp_rec; t++) {
	    if (savebuffer.records[r].trials[t] != EGG_MISSING_DATA) {
	      ptrials++;
	      psum += savebuffer.records[r].trials[t];
	    }
	  }
	}
	mean_Packet = ((double) psum) / ptrials;
	totalGrand += psum;
	totalTrials += ptrials;
	mean_Grand = totalGrand / totalTrials;
	total_Packets++;
	printf("Packets sent: %ld  Packet mean: %6.2f  Grand mean: %6.2f\n",
		total_Packets, mean_Packet, mean_Grand);
#endif
      }

      /* Check for change to the collection parameters...
	 now is the time to implement it. */

      if (coll.opts.rec_pkt != protocol.rec_pkt ||
	  coll.opts.trialsz != protocol.trialsz ||
	  coll.opts.sec_rec != protocol.sec_rec ||
	  coll.opts.samp_rec != protocol.samp_rec) {
	sps = SetCollOpts();
	saveProtocol();
      }
      /* Reinitialise carton to interval containing sample */
      resetCarton(t.tv_sec);
    }

    /* Store the sample into the carton, which is now guaranteed to
       bracket the interval in which it was collected. */

#ifdef DEBUG
    /* But let's be sure it really *is* in the interval. */
    if (t.tv_sec < savebuffer.records[0].timestamp ||
	t.tv_sec >= (savebuffer.records[0].timestamp + savebuffer.hdr.sec_rec * savebuffer.hdr.rec_pkt)) {
      fprintf(stderr, "***Sample, collected at %ld, is not within packet starting at %ld.\n",
	      t.tv_sec, savebuffer.records[0].timestamp);
      exit(-1);
    }
#endif

    rindex = t.tv_sec - savebuffer.records[0].timestamp;
    savebuffer.records[rindex / savebuffer.hdr.sec_rec].trials[rindex % savebuffer.hdr.sec_rec] = sample;

    /* 2E. Update user interface. */

#ifndef NO_UI
    coll.data.trials[coll.sampct] = sample;
    coll.sampct++;
    UIUpdate(coll.sampct >= coll.opts.samp_rec, &coll);

    if (coll.sampct >= coll.opts.samp_rec) {
	coll.sampct = 0;
    }
#endif

    /* Now that the current sample has been dealt which, check
       for egg-initiated actions whose time has come.  */

    /* 2F. First of all, it it's time to prod the basket with an
       awake packet, lob one over the pole. */

    if (getzulutime(NULL) - lastconn > (eggtable[0].connival * 60L)) {
      lastsend = lastconn = getzulutime(NULL);
      
      /* If this is a dial-and-drop egg, connect to the network before
	 sending the packet. */

      if (sdlisten < 0 && eggtable[0].conntype == CONN_DND) {
	sdlisten = NetUp(eggtable[0].upcmd, myaddr, myport);
      }
      
      GreetBasket();
    }
    
    /* 2G. If this is a dial-and-drop egg and it's been more than a
       minute since we sent anything, tear down the network connection. */
    
    if (eggtable[0].conntype == CONN_DND && sdlisten >= 0) {
      if ((getzulutime(NULL) - lastsend) > 60L) {
	NetDown(eggtable[0].dncmd, sdlisten);
	sdlisten = -1;
      }
    }

    /* Now deal with basket-initiated requests received on the socket
       since the last time around the loop.  To improve throughput for
       dialup connections, we may come back here several times if we
       have more data and if time allows.  */

    do {
      havedata = 0;	/* Don't loop unless net activity happens. */

      /* 1A. Wait for connection. */
      if (eggtable[0].conntype == CONN_PERM) {
	if (sdlisten < 0) {
	  /* Initialize networking, get a listening socket at EGGPORT */
	  sdlisten = InitNetwork(myaddr, myport);
	}
      }
      if (sdlisten >= 0) {
	res = NetListen(sdlisten, &pktbuf, &rhost, FALSE);
	if (res < 0 && res != ERR_COMM_TMOUT) {
	  fprintf(stderr, "NetListen error: %d\n", res);
	  break;	/* Out of do loop */
	}
	/* Data present, process networking thread */
	if (res == ERR_NONE) {
	  /* 1B. Validate connection. 
	     Remote host address is in rhost.  Make sure this is either an
	     egg or a basket, and set the flag appropriately. */
	  isbasket = 0;
	  for (i = 0; i < numbaskets; i++) {
	    if (!memcmp(&(rhost.sin_addr),
			&(baskettable[i].ipaddr.sin_addr),
			sizeof(rhost.sin_addr))) {
	      isbasket = 1;
	      remname = baskettable[i].name;
	    }
	  }
	  
	  if (!isbasket) {
	    fprintf(stderr, "Attempt to connect from unknown source: %s",
		    sockaddr2dquad(&rhost));
	    break;	/* Out of do loop */
	  }

	  havedata = 1;	/* Initial assumption, until disproven. */
	  
	  memcpy(&pkttype, pktbuf, sizeof(uint16));
	  memcpy(&pktsize, pktbuf+sizeof(uint16), sizeof(uint16));
	  pkttype = ntohs(pkttype);
	  pktsize = ntohs(pktsize);
	  
	  /* 1C. Reply to connection. */
	  switch(pkttype) {
	  case DATA_PACKET:
	  case AWAKE_PACKET:
	    /* Not acceptable at an eggsite. */
	    fprintf(stderr, "%s: EGG could not accept %d packet\n", 
		    pgmname, pkttype);
	    break;
	    
	    /* Request for data from a basket. */
	    
	  case REQ_PACKET:
	    {
	      uint16 reggid;
	      uint32 stime;
	      char *pktP = pktbuf + (2 * sizeof(uint16));
	      
	      unpackShort(reggid);
	      unpackLong(stime);
#ifdef PACKETDUMP
	      fprintf(stderr, "Request: eggid = %d, starttm = %ld: %s",
		      reggid, stime, asctime(gmtime((time_t *) &stime)));
#endif
	      res = LoadPacket(stime, reggid, &retrcart);
	    }
	    if (res == ERR_NONE) {
	      /* NetPacketize it */
	      MakeDataPkt(&outpktbuf, &retrcart);
	      rhost.sin_port = htons(BASKETPORT);
	      res = NetTalk(&rhost, outpktbuf, TRUE);
	      if (res < 0) {
		fprintf(stderr, "NetTalk failed (%d)\n", res);
	      }
	      free(outpktbuf);
	      lastDataSent = lastsend = getzulutime(NULL);
	    } else if (res == ERR_EOF) {
	      /* End of data.  If DND, bring down connection */
	      if (eggtable[0].conntype == CONN_DND) {
		NetDown(eggtable[0].dncmd, sdlisten);
		sdlisten = -1;
	      }
	      havedata = 0;
	    }
	    break;
	    
	  case SETTINGS_PACKET:
	    /* Update settings in buffer, will change at next packet
	       boundary. */
	    
	    { char *pktP = pktbuf + (3 * sizeof(uint16)) + sizeof(uint32);
	    
	    unpackShort(protocol.samp_rec);
	    unpackShort(protocol.sec_rec);
	    unpackShort(protocol.rec_pkt);
	    unpackByte(protocol.trialsz);
	    }
#ifdef PACKETDUMP
	    fprintf(stderr, "Settings: samp_rec = %d, sec_rec = %d, rec_pkt = %d, trialsz = %d\n",
		    protocol.samp_rec, protocol.sec_rec, protocol.rec_pkt, protocol.trialsz);
#endif
	    break;
	  }
	  free(pktbuf);
	}
      }
      gettimeofday(&ct, NULL);
    } while (havedata && ct.tv_usec < 1000000L - MINSLEEP);

    /* 2H. Compute the length in microseconds we should sleep before
       the top of the next second.  Note that we compute the interval
       based on the time at the bottom of the loop, after dealing with
       whatever housekeeping requests may have been performed since
       collecting the last sample. */

    gettimeofday(&ct, NULL);
    if (lt.tv_sec == 0) {
	lt.tv_sec = t.tv_sec - 1;
    }
    time_latency = (((t.tv_sec - lt.tv_sec) - 1) * 1000000L) + t.tv_usec;
    time_housekeeping = ((ct.tv_sec - t.tv_sec) * 1000000L) + (ct.tv_usec - t.tv_usec);
#ifdef DEBUG
    usec = time_latency;
    msec = usec / 1000;
    usec %= 1000;
    printf("Sampling latency: %ld.%03ld msec", msec, usec);

    usec = time_housekeeping;
    msec = usec / 1000;
    usec %= 1000;
    printf("  Housekeeping time: %ld.%03ld msec\n", msec, usec);
#endif
    lt = ct;
    sleeptime = ((1000000 - SLACK) - ct.tv_usec);
    /* printf("Sleep time = %d usec\n", sleeptime); */
  }
}

/* EGG specific */

/*  LoadRCFile	--  Read in a configuration file.  If the filename
		    argument is NULL, the default file is read.
		    Otherwise, configuration statements are read
		    from the file given by the argument.  */

static void LoadRCFile(char *filename) {
  FILE *fp;
  char linebuf[200];
  char *myargv[MAX_PARSE], *tp;
  int myargc, lcount, p, b, i;

  if (filename != NULL) {
    if ((fp = fopen(filename, "r")) == NULL) {
        fprintf(stderr, "%s: Cannot open auxiliary configuration file %s.\n", pgmname, filename);
	exit(-1);
    }
  } else {
    if ((fp = fopen(".eggrc", "r")) == NULL) {
      if ((fp = fopen("~/.eggrc", "r")) == NULL) {
        if ((fp = fopen("/etc/eggrc", "r")) == NULL) {
          fprintf(stderr, "%s: Couldn't find a egg RC file.\n", pgmname);
	  exit(-1);
	}
      }
    }
  }

  lcount = 0;

  while(fgets(linebuf, 200, fp) != NULL) {
    /* Comments and blank lines ignored. */
    lcount++;
    if (*linebuf == '#' || *linebuf == '\n') continue;
    Parse(linebuf, &myargc, myargv);
    if (myargc == 0) continue;
    if (!strcmp(myargv[0], "EGG")) {
      if (myargc < 7 || myargc > 8) {
        fprintf(stderr, "%s: RC error, line %d, poor %s format\n", 
		pgmname, lcount, myargv[0]);
	exit(-1);
      }
      if (numeggs > 0) {
        fprintf(stderr, "%s: RC error, line %d, only one EGG allowed\n", 
		pgmname, lcount);
	exit(-1);
      }

      eggtable[0].name = mallocpy(myargv[1]);
      eggtable[0].id = atoi(myargv[2]);
      dquad2sockaddr(&(eggtable[0].ipaddr), NULL, myargv[3]);
      eggtable[0].primbasket = mallocpy(myargv[4]);
      eggtable[0].conntype = (!strcmp(myargv[5], "PERM"))?CONN_PERM:CONN_DND;
      eggtable[0].connival = atoi(myargv[6]);
      eggtable[0].url = NULL;	/* URL specification is permitted, but ignored */
      numeggs = 1;
    } else if (!strcmp(myargv[0], "BASKET")) {
      if (myargc != 3) {
        fprintf(stderr, "%s: RC error, line %d, poor %s format\n", 
		pgmname, lcount, myargv[0]);
	exit(-1);
      }
      baskettable[numbaskets].name = mallocpy(myargv[1]);
      dquad2sockaddr(&(baskettable[numbaskets].ipaddr), NULL, myargv[2]);
      numbaskets++;
    } else if (!strcmp(myargv[0], "PROTOCOL")) {
      if (myargc != 5) {
        fprintf(stderr, "%s: RC error, line %d, poor %s format\n", 
		pgmname, lcount, myargv[0]);
	exit(-1);
      }
      protocol.samp_rec = atoi(myargv[1]);
      protocol.sec_rec = atoi(myargv[2]);
      protocol.rec_pkt = atoi(myargv[3]);
      protocol.trialsz = atoi(myargv[4]);

    /*	REG:  Configure Random Event Generator for this egg.  */

    } else if (!strcmp(myargv[0], "REG")) {
      if (myargc != 4) {
        fprintf(stderr, "%s: RC error, line %d, poor %s format\n", 
		pgmname, lcount, myargv[0]);
	exit(-1);
      }
      if (configuredREG != NULL) {
        fprintf(stderr, "%s: RC error, line %d, multiple REGs specified.\n",
		pgmname, lcount);
	exit(-1);
      }
      for (i = 0; reg_table[i] != NULL; i++) {
	if (strcasecmp(myargv[1], reg_table[i]->reg_name) == 0) {
	  configuredREG = reg_table[i];
	  devopts.type = reg_table[i]->reg_type;
	}
      }
      if (configuredREG == NULL) {
        fprintf(stderr, "%s: RC error, line %d, unknown REG type %s specified.\n",
		pgmname, lcount, myargv[1]);
	exit(-1);
      }
	
      devopts.port = atoi(myargv[2]);
      devopts.baud = atoi(myargv[3]);
    } else if (!strcmp(myargv[0], "NETUP") ||
               !strcmp(myargv[0], "NETDOWN") ||
	       !strcmp(myargv[0], "PORT") ||
	       !strcmp(myargv[0], "INTERFACE")) {
      if (myargc < 2) {
        fprintf(stderr, "%s: RC error, line %d, poor %s format\n", 
		pgmname, lcount, myargv[0]);
	exit(-1);
      }
      tp = (char *) malloc(200);
      for (*tp = 0, p = 1; p < myargc; p++) {
	strcat(tp, myargv[p]);
        if (p < myargc-1) strcat(tp, " ");
      }

      if (!strcmp(myargv[0], "NETUP")) eggtable[0].upcmd = tp;
      else if (!strcmp(myargv[0], "NETDOWN")) eggtable[0].dncmd = tp;
      else if (!strcmp(myargv[0], "PORT")) {
	if (atoi(tp) <= 0) {
	  fprintf(stderr, "%s: RC error, ignoring bad port %d, using %d\n",
		  pgmname, atoi(tp), myport);
	} else {
	  myport = atoi(tp);
	}
	free(tp);
      } else if (!strcmp(myargv[0], "INTERFACE")) myaddr = tp;
    } else {
      fprintf(stderr, "%s: RC error, %s is unknown keyword\n", pgmname, myargv[0]);
      exit(-1);
    }
  }

  /* Consistency checks done only after loading the main
     configuration file. */

  if (filename == NULL) {
    for (p = -1, b = 0; b < numbaskets; b++) {
      if (!strcmp(baskettable[b].name, eggtable[0].primbasket)) p = b;
    }

    if (p != 0) {
      fprintf(stderr, "%s: RC error, primary basket should be listed first.\n", pgmname);
      exit(-1);
    }
  } else {
      printf("Reloaded auxiliary configuration file %s.\n", filename);
  }
  fclose(fp);
}

/*  MakeAwake  --  Make a egg awake packet to let the basket
                   know we're on line.  */

static void MakeAwake(AwakePacket *pkt) {
  char *pktP = (char *) pkt;

  packShort(AWAKE_PACKET);
  packShort((4 * sizeof(uint16)) + sizeof(uint32));
  packShort(eggtable[0].id);
  packLong(getzulutime(NULL));
}

/*  MakeDataPkt  --  Build a canonical network byte order data packet
		     from the data collected in an EggCarton.  */

static void MakeDataPkt(char **pkt, EggCarton *src) {
  uint16 pktsize, rec;
  char *pktP;

  pktsize = (7 * sizeof(uint16)) + sizeof(trial) +	    /* Header */
	    (src->hdr.numrec * (sizeof(uint32) +	    /* Trial data */
		src->hdr.samp_rec * sizeof(trial))) +
	    sizeof(uint16);				    /* CRC-16 */
  *pkt = pktP = (char *) malloc(pktsize);

  /* Assemble header fields into data packet. */

  packShort(src->hdr.type = DATA_PACKET);
  packShort(src->hdr.pktsize = pktsize);
  packShort(src->hdr.eggid);
  packShort(src->hdr.samp_rec);
  packShort(src->hdr.sec_rec);
  packShort(src->hdr.rec_pkt);
  packByte(src->hdr.trialsz);
  packShort(src->hdr.numrec);

  /* Append data records to packet. */

  for (rec = 0; rec < src->hdr.numrec; rec++) {
    packLong(src->records[rec].timestamp);
    packBytes(&(src->records[rec].trials), src->hdr.samp_rec);
  }

  /* No need to calculate CRC -- NetTalk does that for us.
     Note that we did reserve space for the CRC when
     allocating the packet buffer. */
}

/*  SetCollOpts  --  Set collection options from the protocol
		     specified in the .rc file or by a basket.	*/

static double SetCollOpts(void) {
  double sps;

  coll.opts.eggid = eggtable[0].id;
  
  coll.opts.rec_pkt = protocol.rec_pkt;
  if (coll.opts.rec_pkt < 1) coll.opts.rec_pkt = 1;
  if (coll.opts.rec_pkt > MAXREC_PKT) coll.opts.rec_pkt = MAXREC_PKT;

  coll.opts.trialsz = protocol.trialsz;
  if (coll.opts.trialsz < MINBITS) {
    fprintf(stderr, "Attempt to set trial size below %d, to %d.\n",
	    MINBITS, coll.opts.trialsz);
    coll.opts.trialsz = MINBITS;
  }
  if (coll.opts.trialsz > MAXBITS) {
    fprintf(stderr, "Attempt to set trial size above %d, to %d.\n",
	    MAXBITS, coll.opts.trialsz);
    coll.opts.trialsz = MAXBITS;
  }

  coll.opts.sec_rec = protocol.sec_rec;
  if (coll.opts.sec_rec < 1) {
    fprintf(stderr, "Attempt to set seconds/record below 1, to %d.\n",
	    coll.opts.sec_rec);
    coll.opts.sec_rec = 1;
  }
  if (coll.opts.sec_rec > MAXSEC_REC) {
    fprintf(stderr, "Attempt to set seconds/record above %d, to %d.\n",
	    MAXSEC_REC, coll.opts.sec_rec);
    coll.opts.sec_rec = MAXSEC_REC;
  }

  coll.opts.samp_rec = protocol.samp_rec;
  if (coll.opts.samp_rec < 1) {
    fprintf(stderr, "Attempt to set samples/record below 1, to %d.\n",
	    coll.opts.samp_rec);
    coll.opts.samp_rec = 1;
  }
  if (coll.opts.samp_rec > MAXSAMP_REC) {
    fprintf(stderr, "Attempt to set samples/record above %d, to %d.\n",
	    MAXSAMP_REC, coll.opts.samp_rec);
    coll.opts.samp_rec = MAXSAMP_REC;
  }

  sps = (double)coll.opts.samp_rec / (double)coll.opts.sec_rec;

  fprintf(stderr, "Effective sample rate is about %f samp/sec or %f bits/sec\n",
	  sps, coll.opts.trialsz * sps);
  fprintf(stderr, "Packets contain %d records\n", coll.opts.rec_pkt);

  return sps;
}

/*  GreetBasket  --  Send an awake packet to each configured
		     basket.  */

static int GreetBasket(void) {
  int			i, b;
  struct sockaddr_in	bhost;
  AwakePacket		awake;

  MakeAwake(&awake);

  for (b = 0; b < numbaskets; b++) {
    memset(&bhost, 0, sizeof(struct sockaddr_in));
    memcpy(&bhost, &(baskettable[b].ipaddr), sizeof(bhost));
    bhost.sin_port = htons(BASKETPORT);
    bhost.sin_family = AF_INET;

    /* Don't gripe about network unreachable.  Just means 
       network is down right now, try later. */
    i = NetTalk(&bhost, (char *)&awake, FALSE);
    if (i < 0) {
      /* Couldn't get to this one, try others. */
#ifdef DEBUG
      fprintf(stderr, "%s: Failure to reach basket '%s'\n", 
	      pgmname, baskettable[b].name);
#endif
    } else {
      return ERR_NONE;
    }
  }

  return ERR_COMM_TMOUT;
}

/*  handle_sigkill  --	KILL signal handler.  Terminate user interface
			and exit.  */

static void handle_sigkill(int arg) {
  UIClose();
  exit(-1);
}

/*  handle_sighup  --  HUP signal handler.  Reload protocol from the
		       .eggprotocolrc file.  */

static void handle_sighup(int arg) {
  LoadRCFile(".eggprotocolrc");
#ifndef SIGACTION_WORKING
  signal(SIGHUP, handle_sighup);
#endif
}