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b68eb7dbb2840ebca4d670c8f886718ae333aaae
epics-base/src/ca/iocinf.h
Janet B. Anderson a175ac0518 Modified log message.
1998-10-07 14:32:52 +00:00

778 lines
21 KiB
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/* $Id */
/************************************************************************/
/* */
/* L O S A L A M O S */
/* Los Alamos National Laboratory */
/* Los Alamos, New Mexico 87545 */
/* */
/* Copyright, 1986, The Regents of the University of California. */
/* */
/* */
/* History */
/* ------- */
/* .01 08xx87 joh Init Release */
/* .02 01xx90 joh fd_set in the UNIX version only */
/* .03 060691 joh Rearanged buffer struct for SPARC port */
/* .04 072391 joh new lock prevents event preemption on vxWorks */
/* .05 082791 joh declaration of ca_request_event() */
/* .06 082791 joh added send message in progress flag */
/* .07 091691 joh moved channel_state enum to cadef.h for export */
/* .08 102991 joh added sprintf buffer */
/* .09 111891 joh added event task id for vxWorks */
/* .10 111991 joh mobe IODONESUB macro to service.c */
/* .11 031692 joh added declaration for post_msg() */
/* .12 031892 joh initial rebroadcast delay is now a #define */
/* .13 050492 joh added exception channel fd set */
/* .14 111792 joh increased MAXCONNTRIES from 3 to 30 */
/* .15 112092 joh added AST lck count var for VMS */
/* .16 120992 joh switched to dll list routines */
/* .17 121892 joh added TCP send buf size var */
/* .18 122192 joh added outstanding ack var */
/* .19 012094 joh added minor version (for each server) */
/************************************************************************/
/*
* $Log$
* Revision 1.73 1998/09/24 21:22:53 jhill
* CLR_CA_TIME() now correctly zeros the delay
*
* Revision 1.72 1998/06/16 01:07:56 jhill
* removed caHostFromInetAddr
*
* Revision 1.71 1998/05/05 16:04:19 jhill
* added lock count var
*
* Revision 1.70 1998/04/13 19:14:34 jhill
* fixed task variable problem
*
* Revision 1.69 1998/03/12 20:39:10 jhill
* fixed problem where 3.13.beta11 unable to connect to 3.11 with correct native type
*
* Revision 1.68 1998/02/20 21:52:21 evans
* Added an explicit include of tsDefs.h before cadef.h to avoid the
* functions in it being declared as export and also to avoid its
* allocating space when it should be declaring a reference.
*
* Revision 1.67 1998/02/05 22:30:34 jhill
* fixed dll export problems
*
* Revision 1.66 1997/08/04 23:37:11 jhill
* added beacon anomaly flag init/allow ip 255.255.255.255
*
* Revision 1.64 1997/06/13 09:14:21 jhill
* connect/search proto changes
*
* Revision 1.63 1997/05/05 04:45:25 jhill
* send_needed => pushPending, and added ca_number_iiu_in_fc
*
* Revision 1.62 1997/04/29 06:11:08 jhill
* use free lists
*
* Revision 1.61 1997/04/23 17:05:07 jhill
* pc port changes
*
* Revision 1.60 1997/04/10 19:26:24 jhill
* asynch connect, faster connect, ...
*
* Revision 1.59 1997/01/22 21:10:26 jhill
* smaller external sym name for VAXC
*
* Revision 1.58 1996/11/02 00:50:56 jhill
* many pc port, const in API, and other changes
*
* Revision 1.57 1996/09/16 16:38:05 jhill
* local except => except handler
*
* Revision 1.56 1996/08/13 23:16:19 jhill
* removed os specific code
*
* Revision 1.55 1996/08/05 19:21:26 jhill
* removed unused proto
*
* Revision 1.54 1996/06/20 21:43:15 jhill
* restored io_done_sem (removed by cleanup)
*
* Revision 1.53 1996/06/20 21:19:35 jhill
* fixed posix signal problem with "cc -Xc"
*
* Revision 1.52 1996/06/19 17:59:07 jhill
* many 3.13 beta changes
*
* Revision 1.51 1995/12/19 19:33:07 jhill
* function prototype changes
*
* Revision 1.50 1995/10/18 16:45:40 jhill
* Use recast delay greater than one vxWorks tick
*
* Revision 1.49 1995/10/12 01:33:12 jhill
* Initial delay between search frames went from .1 to .01 sec,
* Added flush pending flag, Make all usage of port be unsigned short.
*
* Revision 1.48 1995/09/29 21:55:38 jhill
* added func proto for cacDisconnectChannel()
*
* Revision 1.47 1995/08/22 00:20:27 jhill
* added KLUDGE def of S_db_Pending
*/
/*_begin */
/************************************************************************/
/* */
/* Title: channel access TCPIP interface include file */
/* File: atcs:[ca]iocinf.h */
/* Environment: VMS, UNIX, VRTX */
/* */
/* */
/* Purpose */
/* ------- */
/* */
/* ioc interface include */
/* */
/* */
/* Special comments */
/* ------- -------- */
/* Use GLBLTYPE to define externals so we can change the all at */
/* once from VAX globals to generic externals */
/* */
/************************************************************************/
/*_end */
#ifndef INCiocinfh
#define INCiocinfh
#ifdef CA_GLBLSOURCE
# define GLBLTYPE
#else
# define GLBLTYPE extern
#endif
#if defined(__STDC__) && !defined(VAXC)
# define VERSIONID(NAME,VERS) \
char *EPICS_CAS_VID_ ## NAME = VERS;
#else /*__STDC__*/
# define VERSIONID(NAME,VERS) \
char *EPICS_CAS_VID_/* */NAME = VERS;
#endif /*__STDC__*/
#ifdef CAC_VERSION_GLOBAL
# define HDRVERSIONID(NAME,VERS) VERSIONID(NAME,VERS)
#else /*CAC_VERSION_GLOBAL*/
# define HDRVERSIONID(NAME,VERS)
#endif /*CAC_VERSION_GLOBAL*/
HDRVERSIONID(iocinfh, "$Id$")
/*
* ANSI C includes
* !!!!! MULTINET/VMS breaks if we include ANSI time.h here !!!!!
*/
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <stdarg.h>
/*
* OS dependent includes
*/
#include "osiSock.h"
#include "os_depen.h"
/*
* EPICS includes
*/
#if defined(epicsExportSharedSymbols)
#error suspect that libCom was not imported
#endif
#include "epicsAssert.h"
#include "bucketLib.h"
#include "ellLib.h"
#include "envDefs.h"
#include "epicsPrint.h"
#include "tsDefs.h"
#if defined(epicsExportSharedSymbols)
#error suspect that libCom was not imported
#endif
/*
* this is defined only after we import from libCom above
*/
#define epicsExportSharedSymbols
#include "cadef.h"
/*
* CA private includes
*/
#include "addrList.h"
#include "caProto.h"
#include "net_convert.h"
#ifndef NULL
#define NULL 0
#endif
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE 1
#endif
#ifndef OK
#define OK 0
#endif
#ifndef ERROR
#define ERROR (-1)
#endif
#ifndef NELEMENTS
#define NELEMENTS(array) (sizeof(array)/sizeof((array)[0]))
#endif
#ifndef LOCAL
#define LOCAL static
#endif
/*
* writable channel_in_use and pending_event pointers
* for internal use
*/
typedef struct channel_in_use *ciu;
typedef struct pending_event *miu;
#ifndef min
#define min(A,B) ((A)>(B)?(B):(A))
#endif
#ifndef max
#define max(A,B) ((A)<(B)?(B):(A))
#endif
#define MSEC_PER_SEC 1000L
#define USEC_PER_SEC 1000000L
/*
* catch when they use really large strings
*/
#define STRING_LIMIT 512
#define INITCHK \
if(!ca_static){ \
int s; \
s = ca_task_initialize(); \
if(s != ECA_NORMAL){ \
return s; \
} \
}
/* throw out requests prior to last ECA_TIMEOUT from ca_pend */
#define VALID_MSG(PIIU) (piiu->read_seq == piiu->cur_read_seq)
#define SETPENDRECV {pndrecvcnt++;}
#define CLRPENDRECV {if(--pndrecvcnt<1u){POST_IO_EV;}}
struct udpmsglog{
long nbytes;
int valid;
struct sockaddr_in addr;
};
struct putCvrtBuf{
ELLNODE node;
unsigned long size;
void *pBuf;
};
/*
* for use with cac_select_io()
*/
#define CA_DO_SENDS (1<<0)
#define CA_DO_RECVS (1<<1)
typedef struct timeval ca_time;
#define LD_CA_TIME(FLOAT_TIME,PCATIME) \
((PCATIME)->tv_sec = (long) (FLOAT_TIME), \
(PCATIME)->tv_usec = (long) ( ((FLOAT_TIME)-(PCATIME)->tv_sec)*USEC_PER_SEC ))
#define CLR_CA_TIME(PCATIME) ((PCATIME)->tv_sec = 0u,(PCATIME)->tv_usec = 0u)
/*
* these control the duration and period of name resolution
* broadcasts
*/
#define MAXCONNTRIES 100 /* N conn retries on unchanged net */
/*
* A prime number works best here (see comment in retrySearchRequest()
*/
#define TRIESPERFRAME 5u /* N UDP frames per search try */
/*
* NOTE: These must be larger than one vxWorks tick or we will end up
* using the CPU. A vxWorks tick is usually 1/60th of a sec. The
* vxWorks implementation of select is not efficient.
* select() with no delay takes (on a hk nitro 060):
* 17uS (no fd)
* 56uS (one UDP read fd)
* 80uS (two UDP read fd)
* 113uS (one UDP read/write fd)
* 185uS (two UDP read/write fd)
* 3 uS are required to call FD_ZERO (&readMask)
* and FD_ZERO (&writeMask)
* 4 uS required to call cac_gettimeval()
*/
#ifdef vxWorks
#define SELECT_POLL_SEARCH (0.075) /* units sec - polls for search request (4 ticks)*/
#else
#define SELECT_POLL_SEARCH (0.025) /* units sec - polls for search request */
#endif
#define SELECT_POLL_NO_SEARCH (0.5) /* units sec - polls for conn heartbeat */
#define CA_RECAST_DELAY SELECT_POLL_SEARCH /* initial delay to next recast (sec) */
#define CA_RECAST_PORT_MASK 0xff /* random retry interval off port */
#define CA_RECAST_PERIOD (5.0) /* ul on retry period long term (sec) */
/*
* these two control the period of connection verifies
* (echo requests) - CA_CONN_VERIFY_PERIOD - and how
* long we will wait for an echo reply before we
* give up and flag the connection for disconnect
* - CA_ECHO_TIMEOUT.
*
* CA_CONN_VERIFY_PERIOD is normally obtained from an
* EPICS environment variable.
*/
#define CA_ECHO_TIMEOUT 5.0 /* (sec) disconn no echo reply tmo */
#define CA_CONN_VERIFY_PERIOD 30.0 /* (sec) how often to request echo */
/*
* only used when communicating with old servers
*/
#define CA_RETRY_PERIOD 5 /* int sec to next keepalive */
#define N_REPEATER_TRIES_PRIOR_TO_MSG 50
#define REPEATER_TRY_PERIOD (1.0)
#ifdef vxWorks
typedef struct caclient_put_notify{
ELLNODE node;
PUTNOTIFY dbPutNotify;
unsigned long valueSize; /* size of block pointed to by dbPutNotify */
void (*caUserCallback)(struct event_handler_args);
void *caUserArg;
struct CA_STATIC *pcas;
int busy;
}CACLIENTPUTNOTIFY;
#endif /*vxWorks*/
/*
* this determines the number of messages received
* without a delay in between before we go into
* monitor flow control
*
* turning this down effect maximum throughput
* because we dont get an optimal number of bytes
* per network frame
*/
#define MAX_CONTIGUOUS_MSG_COUNT 10
/*
* ! lock needs to be applied when an id is allocated !
*/
#define CLIENT_HASH_TBL_SIZE (1<<12)
#define CLIENT_ID_WIDTH 28 /* bits */
#define CLIENT_ID_COUNT (1<<CLIENT_ID_WIDTH)
#define CLIENT_ID_MASK (CLIENT_ID_COUNT-1)
#define CLIENT_FAST_ID_ALLOC (CLIENT_ID_MASK&nextFastBucketId++)
#define CLIENT_SLOW_ID_ALLOC (CLIENT_ID_MASK&nextSlowBucketId++)
#define SEND_RETRY_COUNT_INIT 100
#define iiuList (ca_static->ca_iiuList)
#define piiuCast (ca_static->ca_piiuCast)
#define pndrecvcnt (ca_static->ca_pndrecvcnt)
#define ioeventlist (ca_static->ca_ioeventlist)
#define nxtiiu (ca_static->ca_nxtiiu)
#define pend_read_list (ca_static->ca_pend_read_list)
#define pend_write_list (ca_static->ca_pend_write_list)
#define fd_register_func\
(ca_static->ca_fd_register_func)
#define fd_register_arg (ca_static->ca_fd_register_arg)
#define post_msg_active (ca_static->ca_post_msg_active)
#define sprintf_buf (ca_static->ca_sprintf_buf)
#define pSlowBucket (ca_static->ca_pSlowBucket)
#define pFastBucket (ca_static->ca_pFastBucket)
#define nextSlowBucketId (ca_static->ca_nextSlowBucketId)
#define nextFastBucketId (ca_static->ca_nextFastBucketId)
#if defined(vxWorks)
# define io_done_sem (ca_static->ca_io_done_sem)
# define evuser (ca_static->ca_evuser)
# define client_lock (ca_static->ca_client_lock)
# define local_chidlist (ca_static->ca_local_chidlist)
# define lcl_buff_list (ca_static->ca_lcl_buff_list)
# define lock_tid (ca_static->ca_lock_tid)
# define lock_count (ca_static->ca_lock_count)
#endif
/*
* one for each task that does a ca import
*/
typedef struct task_var_list{
ELLNODE node;
int tid;
}TVIU;
/*
* Ring buffering for both sends and recvs
*/
struct ca_buffer{
char buf[MAX_MSG_SIZE]; /* from iocmsg.h */
unsigned long max_msg;
unsigned long rdix;
unsigned long wtix;
int readLast;
};
#define CAC_RING_BUFFER_INIT(PRBUF, SIZE) \
assert((SIZE)>sizeof((PRBUF)->buf)); \
(PRBUF)->max_msg = (SIZE); \
(PRBUF)->rdix = 0; \
(PRBUF)->wtix = 0; \
(PRBUF)->readLast = TRUE;
#define CAC_RING_BUFFER_READ_ADVANCE(PRBUF, DELTA) \
( (PRBUF)->readLast = TRUE, \
((PRBUF)->rdix += (DELTA)) >= (PRBUF)->max_msg ? \
(PRBUF)->rdix = 0 : \
(PRBUF)->rdix \
)
#define CAC_RING_BUFFER_WRITE_ADVANCE(PRBUF, DELTA) \
( (PRBUF)->readLast = FALSE, \
((PRBUF)->wtix += (DELTA)) >= (PRBUF)->max_msg ? \
(PRBUF)->wtix = 0 : \
(PRBUF)->wtix \
)
#define TAG_CONN_DOWN(PIIU) \
( \
/* ca_printf("Tagging connection down at %d in %s\n", __LINE__, __FILE__), */ \
(PIIU)->state = iiu_disconnected\
)
enum iiu_conn_state{iiu_connecting, iiu_connected, iiu_disconnected};
/*
* One per IOC
*/
typedef struct ioc_in_use{
ELLNODE node;
ELLLIST chidlist; /* chans on this connection */
ELLLIST destAddr;
ca_time timeAtLastRecv;
ca_time timeAtSendBlock;
ca_time timeAtEchoRequest;
unsigned long curDataMax;
unsigned long curDataBytes;
struct ca_buffer send;
struct ca_buffer recv;
caHdr curMsg;
struct CA_STATIC *pcas;
void *pCurData;
void (*sendBytes)(struct ioc_in_use *);
void (*recvBytes)(struct ioc_in_use *);
void (*procInput)(struct ioc_in_use *);
SOCKET sock_chan;
int sock_proto;
unsigned minor_version_number;
unsigned contiguous_msg_count;
unsigned curMsgBytes;
unsigned read_seq;
unsigned cur_read_seq;
unsigned minfreespace;
char host_name_str[32];
unsigned char state; /* for use with iiu_conn_state enum */
/*
* bit fields placed together for better packing density
*/
unsigned client_busy:1;
unsigned echoPending:1;
unsigned sendPending:1;
unsigned claimsPending:1;
unsigned recvPending:1;
unsigned pushPending:1;
unsigned beaconAnomaly:1;
}IIU;
/*
* for the beacon's recvd hash table
*/
#define BHT_INET_ADDR_MASK 0xff
typedef struct beaconHashEntry{
struct beaconHashEntry *pNext;
IIU *piiu;
struct sockaddr_in inetAddr;
ca_time timeStamp;
ca_real averagePeriod;
}bhe;
/*
* This struct allocated off of a free list
* so that the select() ctx is thread safe
*/
typedef struct {
ELLNODE node;
fd_set readMask;
fd_set writeMask;
}caFDInfo;
struct CA_STATIC {
ELLLIST ca_iiuList;
ELLLIST ca_ioeventlist;
ELLLIST ca_pend_read_list;
ELLLIST ca_pend_write_list;
ELLLIST activeCASG;
ELLLIST activeCASGOP;
ELLLIST putCvrtBuf;
ELLLIST fdInfoFreeList;
ELLLIST fdInfoList;
ca_time currentTime;
ca_time programBeginTime;
ca_time ca_conn_next_retry;
ca_time ca_conn_retry_delay;
ca_time ca_last_repeater_try;
ca_real ca_connectTMO;
IIU *ca_piiuCast;
void (*ca_exception_func)
(struct exception_handler_args);
const void *ca_exception_arg;
int (*ca_printf_func)(const char *pformat, va_list args);
void (*ca_fd_register_func)
(void *, SOCKET, int);
const void *ca_fd_register_arg;
char *ca_pUserName;
char *ca_pHostName;
BUCKET *ca_pSlowBucket;
BUCKET *ca_pFastBucket;
bhe *ca_beaconHash[BHT_INET_ADDR_MASK+1];
void *ca_ioBlockFreeListPVT;
void *ca_sgFreeListPVT;
void *ca_sgopFreeListPVT;
ciu ca_pEndOfBCastList;
unsigned ca_search_responses; /* num valid search resp within seq # */
unsigned ca_search_tries; /* num search tries within seq # */
unsigned ca_search_retry; /* search retry seq number */
unsigned ca_min_retry; /* min retry no so far */
unsigned ca_frames_per_try; /* # of UDP frames per search try */
unsigned ca_pndrecvcnt;
unsigned ca_nextSlowBucketId;
unsigned ca_nextFastBucketId;
unsigned ca_repeater_tries;
unsigned ca_number_iiu_in_fc;
unsigned short ca_server_port;
unsigned short ca_repeater_port;
unsigned short ca_search_retry_seq_no; /* search retry seq number */
unsigned short ca_seq_no_at_list_begin; /* search retry seq number at beg of list*/
char ca_sprintf_buf[256];
char ca_new_err_code_msg_buf[128u];
unsigned ca_post_msg_active:1;
unsigned ca_manage_conn_active:1;
unsigned ca_repeater_contacted:1;
unsigned ca_flush_pending:1;
#if defined(vxWorks)
SEM_ID ca_io_done_sem;
SEM_ID ca_blockSem;
SEM_ID ca_client_lock;
SEM_ID ca_putNotifyLock;
ELLLIST ca_local_chidlist;
ELLLIST ca_lcl_buff_list;
ELLLIST ca_putNotifyQue;
ELLLIST ca_taskVarList;
void *ca_evuser;
void *ca_dbMonixFreeList;
int ca_lock_tid;
unsigned ca_lock_count;
int ca_tid;
int recv_tid;
#endif
};
#define CASG_MAGIC 0xFAB4CAFE
/*
* one per outstanding op
*/
typedef struct{
ELLNODE node;
CA_SYNC_GID id;
void *pValue;
unsigned long magic;
unsigned long seqNo;
}CASGOP;
/*
* one per synch group
*/
typedef struct{
ELLNODE node;
CA_SYNC_GID id;
unsigned long magic;
unsigned long opPendCount;
unsigned long seqNo;
/*
* Asynch Notification
*/
# ifdef vxWorks
SEM_ID sem;
# endif /*vxWorks*/
}CASG;
/*
* GLOBAL VARIABLES
* There should only be one - add others to ca_static above -joh
*/
GLBLTYPE
struct CA_STATIC *ca_static;
/*
* CA internal functions
*
*/
void cac_send_msg(void);
void cac_mux_io(struct timeval *ptimeout);
int repeater_installed(void);
int search_msg(ciu chix, int reply_type);
int ca_request_event(evid monix);
int ca_busy_message(struct ioc_in_use *piiu);
int ca_ready_message(struct ioc_in_use *piiu);
void noop_msg(struct ioc_in_use *piiu);
int echo_request(struct ioc_in_use *piiu, ca_time *pCurrentTime);
int issue_claim_channel(chid pchan);
void issue_identify_client(struct ioc_in_use *piiu);
void issue_client_host_name(struct ioc_in_use *piiu);
int ca_defunct(void);
epicsShareFunc int epicsShareAPI ca_printf(char *pformat, ...);
void manage_conn();
void checkConnWatchdogs();
void mark_server_available(const struct sockaddr_in *pnet_addr);
void flow_control_on(struct ioc_in_use *piiu);
void flow_control_off(struct ioc_in_use *piiu);
int broadcast_addr(struct in_addr *pcastaddr);
epicsShareFunc void epicsShareAPI ca_repeater(void);
void cac_recv_task(int tid);
void ca_sg_init(void);
void ca_sg_shutdown(struct CA_STATIC *ca_temp);
int cac_select_io(struct timeval *ptimeout, int flags);
int post_msg(
struct ioc_in_use *piiu,
const struct sockaddr_in *pnet_addr,
char *pInBuf,
unsigned long blockSize
);
int alloc_ioc(
const struct sockaddr_in *pina,
struct ioc_in_use **ppiiu
);
unsigned long cacRingBufferWrite(
struct ca_buffer *pRing,
const void *pBuf,
unsigned long nBytes);
unsigned long cacRingBufferRead(
struct ca_buffer *pRing,
void *pBuf,
unsigned long nBytes);
unsigned long cacRingBufferWriteSize(
struct ca_buffer *pBuf,
int contiguous);
unsigned long cacRingBufferReadSize(
struct ca_buffer *pBuf,
int contiguous);
void caIOBlockListFree(
ELLLIST *pList,
chid chan,
int cbRequired,
int status);
char *localUserName(void);
char *localHostName(void);
int create_net_chan(
struct ioc_in_use **ppiiu,
const struct sockaddr_in *pina, /* only used by TCP connections */
int net_proto
);
void caSetupBCastAddrList (ELLLIST *pList, SOCKET sock, unsigned short port);
int ca_os_independent_init (void);
void freeBeaconHash(struct CA_STATIC *ca_temp);
void removeBeaconInetAddr(const struct sockaddr_in *pnet_addr);
bhe *lookupBeaconInetAddr(const struct sockaddr_in *pnet_addr);
bhe *createBeaconHashEntry(const struct sockaddr_in *pnet_addr, unsigned sawBeacon);
void notify_ca_repeater(void);
void cac_clean_iiu_list(void);
void ca_process_input_queue(void);
void cac_block_for_io_completion(struct timeval *pTV);
void cac_block_for_sg_completion(CASG *pcasg, struct timeval *pTV);
void os_specific_sg_create(CASG *pcasg);
void os_specific_sg_delete(CASG *pcasg);
void os_specific_sg_io_complete(CASG *pcasg);
void ca_process_exit();
void ca_spawn_repeater(void);
void cac_gettimeval(struct timeval *pt);
/* returns A - B in floating secs */
ca_real cac_time_diff(ca_time *pTVA, ca_time *pTVB);
/* returns A + B in integer secs & integer usec */
ca_time cac_time_sum(ca_time *pTVA, ca_time *pTVB);
void caIOBlockFree(miu pIOBlock);
void clearChannelResources(unsigned id);
void caSetDefaultPrintfHandler (void);
void cacDisconnectChannel(ciu chix);
int caSendMsgPending(void);
void genLocalExcepWFL(long stat, char *ctx,
char *pFile, unsigned line);
#define genLocalExcep(STAT, PCTX) \
genLocalExcepWFL (STAT, PCTX, __FILE__, __LINE__)
void cac_reconnect_channel(caResId id, short type, unsigned short count);
void retryPendingClaims(IIU *piiu);
void cacSetRetryInterval(unsigned retryNo);
void addToChanList(ciu chan, IIU *piiu);
void removeFromChanList(ciu chan);
void cac_create_udp_fd();
double cac_fetch_poll_period(void);
int caSockAddrFromHost(const char *pName, struct sockaddr *paddr);
void cac_close_ioc (IIU *piiu);
/*
* !!KLUDGE!!
*
* this was extracted from dbAccess.h because we are unable
* to include both dbAccess.h and db_access.h at the
* same time.
*/
#define M_dbAccess (501 <<16) /*Database Access Routines */
#define S_db_Blocked (M_dbAccess|39) /*Request is Blocked*/
#define S_db_Pending (M_dbAccess|37) /*Request is pending*/
#endif /* this must be the last line in this file */
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