-<!-- $Header: /home/cvsroot/yaz/doc/frontend.xml,v 1.1 2001-01-04 13:36:24 adam Exp $ -->
+<!-- $Header: /home/cvsroot/yaz/doc/frontend.xml,v 1.2 2001-07-19 12:46:57 adam Exp $ -->
<chapter><title id="server">Making an IR Server for Your Database</title>
<sect1><title>Introduction</title>
If you aren't into documentation, a good way to learn how the
backend interface works is to look at the <filename>backend.h</filename>
file. Then, look at the small dummy-server in
-<filename>server/ztest.c</filename>. Finally, you can have a look at
+<filename>ztest/ztest.c</filename>. Finally, you can have a look at
the <filename>seshigh.c</filename> file, which is where most of the
logic of the frontend server is located. The <filename>backend.h</filename>
file also makes a good reference, once you've chewed your way through
<para>
If you have a database system that you would like to make available by
-means of Z39.50/SR, &yaz; basically offers your two options. You
+means of Z39.50, &yaz; basically offers your two options. You
can use the APIs provided by the &asn;, &odr;, and &comstack;
modules to
-create and decode PDUs, and exchange them with a client. Using this
-low-level interface gives you access to all fields and options of the
-protocol, and you can construct your server as close to your existing
-database as you like. It is also a fairly involved process, requiring
+create and decode PDUs, and exchange them with a client.
+Using this low-level interface gives you access to all fields and
+options of the protocol, and you can construct your server as close
+to your existing database as you like.
+It is also a fairly involved process, requiring
you to set up an event-handling mechanism, protocol state machine,
etc. To simplify server implementation, we have implemented a compact
and simple, but reasonably full-functioned server-frontend that will
We refer to this software as a generic database frontend. Your
database system is the <emphasis>backend database</emphasis>, and the
interface between the two is called the <emphasis>backend API</emphasis>.
-The backend API consists of a small number of function prototypes and
+The backend API consists of a small number of function handlers and
structure definitions. You are required to provide the
<function>main()</function> routine for the server (which can be
-quite simple), as well as functions to match each of the prototypes.
+quite simple), as well as a set of handlers to match each of the prototypes.
The interface functions that you write can use any mechanism you like
to communicate with your database system: You might link the whole
thing together with your database application and access it by
function calls; you might use IPC to talk to a database server
somewhere; or you might link with third-party software that handles
the communication for you (like a commercial database client library).
-At any rate, the functions will perform the tasks of:
+At any rate, the handlers will perform the tasks of:
</para>
<itemizedlist>
</para></listitem>
<listitem><para>
-Scanning the database index (if you wish to implement SCAN).
+Scanning the database index (optional - if you wish to implement SCAN).
+</para></listitem>
+
+<listitem><para>
+Extended Services (optional).
+</para></listitem>
+
+<listitem><para>
+Result-Set Delete (optional).
+</para></listitem>
+
+<listitem><para>
+Result-Set Sort (optional).
</para></listitem>
</itemizedlist>
Z39.50-1995 as possible).
</para>
-<para>
-Because the model where pipes or sockets are used to access the backend
-database is a fairly common one, we have added a mechanism that allows this
-communication to take place asynchronously. In this mode, the frontend
-server doesn't have to block while the backend database is processing
-a request, but can wait for additional PDUs from the client.
-</para>
-
</sect1>
<sect1><title>The Backend API</title>
</para>
<synopsis>
- int statserv_main(int argc, char **argv);
+int statserv_main(int argc, char **argv,
+ bend_initresult *(*bend_init)(bend_initrequest *r),
+ void (*bend_close)(void *handle));
</synopsis>
<para>
+The third and fourth arguments are pointers to handlers. Handler
+<function>bend_init</function> is called whenever the server receives
+an Initialize Request, so it serves as a Z39.50 session initializer. The
+<function>bend_close</function> handler is called when the session is
+closed.
+</para>
+
+<para>
<function>statserv_main</function> will establish listening sockets
according to the parameters given. When connection requests are received,
-the event handler will typically <function>fork()</function> to handle the
-new request. If you do use global variables, you should be aware, then,
+the event handler will typically <function>fork()</function> and
+create a sub-process to handle a new connection.
+Alternatively the server may be setup to create threads for each connection.
+If you do use global variables and forking, you should be aware, then,
that these cannot be shared between associations, unless you explicitly
-disallow forking by command line parameters (we advise against this for
-any purposes except debugging, as a crash or hang in the server process
-will affect all users currently signed on to the server).
+disable forking by command line parameters.
</para>
<para>
</para>
<synopsis>
- statserv_options_block *statserv_getcontrol(void);
+statserv_options_block *statserv_getcontrol(void);
</synopsis>
<para>
<varlistentry><term>int dynamic</term><listitem><para>
A boolean value, which determines whether the server
will fork on each incoming request (TRUE), or not (FALSE). Default is
-TRUE.
+TRUE. This flag is only read by UNIX-based servers (WIN32 based servers
+doesn't fork).
</para></listitem></varlistentry>
+
+<varlistentry><term>int threads</term><listitem><para>
+A boolean value, which determines whether the server
+will create a thread on each incoming request (TRUE), or not (FALSE).
+Default is FALSE. This flag is only read by UNIX-based servers that offer
+POSIX Threads support. WIN32-based servers always operate in threaded mode.
+</para></listitem></varlistentry>
+
+<varlistentry><term>int inetd</term><listitem><para>
+A boolean value, which determines whether the server
+will operates under a UNIX INET daemon (inetd). Default is FALSE.
+</para></listitem></varlistentry>
+
<varlistentry><term>int loglevel</term><listitem><para>
Set this by ORing the constants defined in
<filename>include/yaz/yaz-log.h</filename>.
</para></listitem></varlistentry>
+
<varlistentry><term>char logfile[ODR_MAXNAME+1]</term>
<listitem><para>File for diagnostic output ("": stderr).
</para></listitem></varlistentry>
Name of file for logging incoming and outgoing APDUs ("": don't
log APDUs, "-": <literal>stderr</literal>).
</para></listitem></varlistentry>
+
<varlistentry><term>char default_listen[1024]</term>
<listitem><para>Same form as the command-line specification of
listener address. "": no default listener address.
Default is to listen at "tcp:@:9999". You can only
specify one default listener address in this fashion.
</para></listitem></varlistentry>
+
<varlistentry><term>enum oid_proto default_proto;</term>
<listitem><para>Either <literal>PROTO_SR</literal> or
<literal>PROTO_Z3950</literal>. Default is <literal>PROTO_Z39_50</literal>.
<listitem><para>Maximum session idletime, in minutes. Zero indicates
no (infinite) timeout. Default is 120 minutes.
</para></listitem></varlistentry>
+
<varlistentry><term>int maxrecordsize;</term>
<listitem><para>Maximum permissible record (message) size. Default
is 1Mb. This amount of memory will only be allocated if a client requests a
to a lower number
if you are worried about resource consumption on your host system.
</para></listitem></varlistentry>
+
<varlistentry><term>char configname[ODR_MAXNAME+1]</term>
<listitem><para>Passed to the backend when a new connection is received.
</para></listitem></varlistentry>
+
<varlistentry><term>char setuid[ODR_MAXNAME+1]</term>
<listitem><para>Set user id to the user specified, after binding
the listener addresses.
</para></listitem></varlistentry>
+
+<varlistentry><term>void (*bend_start)(struct statserv_options_block *p)</term>
+<listitem><para>Pointer to function which is called after the command line
+options have been parsed - but before the server starts listening. For
+forked UNIX servers this handler is called in the mother process; for
+threaded servers this handler is called in the main thread. The default
+value of this pointer is NULL in which case it isn't invoked by the frontend
+server. When the server operates as an NT service this handler is called
+whenever the service is started.
+</para></listitem></varlistentry>
+
+<varlistentry><term>void (*bend_stop)(struct statserv_options_block *p)</term>
+<listitem><para>Pointer to function which is called whenver the server
+has stopped listening for incoming connections. This function pointer
+has a default value of NULL in which case it isn't called.
+When the server operates as an NT service this handler is called
+whenever the service is stopped.
+</para></listitem></varlistentry>
+
+<varlistentry><term>void *handle</term>
+<listitem><para>User defined pointer (default value NULL).
+This is a per-server handle that can be used to specify "user-data".
+Do not confuse this with the session-handle as returned by bend_init.
+</para></listitem></varlistentry>
+
</variablelist>
</para>
</para>
<synopsis>
- void statserv_setcontrol(statserv_options_block *block);
+void statserv_setcontrol(statserv_options_block *block);
</synopsis>
<note>
functions representing the services that you wish to implement.
</para>
+<sect2><title>Init</title>
+
<synopsis>
- bend_initresult *bend_init(bend_initrequest *r);
+bend_initresult (*bend_init)(bend_initrequest *r);
</synopsis>
<para>
-This function is called once for each new connection request, after
-a new process has been forked, and an initRequest has been received
-from the client. The parameter and result structures are defined as
+This handler is called once for each new connection request, after
+a new process/thread has been created, and an Initialize Request has been
+received from the client. The pointer to the <function>bend_init</function>
+handler is passed in the call to <function>statserv_start</function>.
+</para>
+<para>
+Unlike previous versions of YAZ, the <function>bend_init</function> also
+serves as a handler that defines the Z39.50 services that the backend
+wish to support. Pointers to <emphasis>all</emphasis> service handlers,
+including search - and fetch must be specified here in this handler.
+</para>
+<para>
+The request - and result structures are defined as
</para>
<synopsis>
typedef struct bend_initrequest
{
- char *configname;
+ Z_IdAuthentication *auth;
+ ODR stream; /* encoding stream */
+ ODR print; /* printing stream */
+ Z_ReferenceId *referenceId;/* reference ID */
+ char *peer_name; /* dns host of peer (client) */
+
+ char *implementation_name;
+ char *implementation_version;
+ int (*bend_sort) (void *handle, bend_sort_rr *rr);
+ int (*bend_search) (void *handle, bend_search_rr *rr);
+ int (*bend_fetch) (void *handle, bend_fetch_rr *rr);
+ int (*bend_present) (void *handle, bend_present_rr *rr);
+ int (*bend_esrequest) (void *handle, bend_esrequest_rr *rr);
+ int (*bend_delete)(void *handle, bend_delete_rr *rr);
+ int (*bend_scan)(void *handle, bend_scan_rr *rr);
+ int (*bend_segment)(void *handle, bend_segment_rr *rr);
} bend_initrequest;
typedef struct bend_initresult
</synopsis>
<para>
-The <literal>configname</literal> of <literal>bend_initrequest</literal>
-is currently always set to "default-config". We haven't had
-use for putting anything special in the initrequest yet, but something
-might go there if the need arises (account/password info would be obvious).
-</para>
-
-<para>
In general, the server frontend expects that the
<literal>bend_*result</literal> pointer that you return is valid at
least until the next call to a <literal>bend_* function</literal>.
structure that is private to your backend module.
</para>
+<para>
+The <literal>auth</literal> member holds the authentication information
+part of the Z39.50 Initialize Request. Interpret this if your serves
+requires authentication.
+</para>
+
+<para>
+The members <literal>peer_name</literal>,
+<literal>implementation_name</literal> and
+<literal>implementation_version</literal> holds DNS of client, name
+of client (Z39.50) implementation - and version.
+</para>
+
+<para>
+The <literal>bend_</literal> - members are set to NULL when
+<function>bend_init</function> is called. Modify the pointers by setting them
+to point to backend functions.
+</para>
+
+</sect2>
+
+<sect2><title>Search and retrieve</title>
+
+<para>We now describe the handlers that are required to support search -
+and retrieve. You must support two functions - one for seearch - and one
+for fetch (retrieval of one record). If desirable you can provide a
+third handler which is called when a present request is received which
+allows you to optimize retrieval of multiple-records.
+</para>
+
<synopsis>
-bend_searchresult *bend_search(void *handle, bend_searchrequest *r,
- int *fd);
-bend_searchresult *bend_searchresponse(void *handle);
+int (*bend_search) (void *handle, bend_search_rr *rr);
+
+typedef struct {
+ char *setname; /* name to give to this set */
+ int replace_set; /* replace set, if it already exists */
+ int num_bases; /* number of databases in list */
+ char **basenames; /* databases to search */
+ Z_ReferenceId *referenceId;/* reference ID */
+ Z_Query *query; /* query structure */
+ ODR stream; /* encode stream */
+ ODR decode; /* decode stream */
+ ODR print; /* print stream */
+
+ bend_request request;
+ bend_association association;
+ int *fd;
+ int hits; /* number of hits */
+ int errcode; /* 0==OK */
+ char *errstring; /* system error string or NULL */
+} bend_search_rr;
-typedef struct bend_searchrequest
-{
- char *setname; /* name to give to this set */
- int replace_set; /* replace set, if it already exists */
- int num_bases; /* number of databases in list */
- char **basenames; /* databases to search */
- Z_Query *query; /* query structure */
-} bend_searchrequest;
-
-typedef struct bend_searchresult
-{
- int hits; /* number of hits */
- int errcode; /* 0==OK */
- char *errstring; /* system error string or NULL */
-} bend_searchresult;
</synopsis>
<para>
-The first thing to notice about the search request interface (as well
-as all of the following requests), is that it consists of two separate
-functions. The idea is to provide a simple facility for
-asynchronous communication with the backend server. When a
-searchrequest comes in, the server frontend will fill out the
-<function>bend_searchrequest</function> tructure, and call the
-<function>bend_search</function> function/. The <literal>fd</literal>
-argument will point to an integer variable. If you are able to do
-asynchronous I/O with your database server, you should set
-<literal>*fd</literal> to the file descriptor you use for the
-communication, and return a null pointer.
-The server frontend will then <function>select()</function> on the
-<literal>*fd</literal>, and will call
-<function>bend_searchresult</function> when it sees that data is available.
-If you don't support asynchronous I/O, you should return a pointer to the
-<function>bend_searchresult</function> immediately, and leave
-<literal>*fd</literal> untouched. This construction is common to
-all of the <function>bend_</function> functions (except
-<function>bend_init</function>). Note that you can choose to support
-this facility in none, any, or all of the <function>bend_</function>
-functions, and you can respond differently on each request at run-time.
-The server frontend will adapt accordingly.
-</para>
-
-<para>
-The <function>bend_searchrequest</function> is a fairly close
-approximation of a protocol searchRequest PDU. The
-<literal>setname</literal> is the resultSetName from the protocol. You
-are required to establish a mapping between the set name and whatever
-your backend database likes to use. Similarly, the
-<literal>replace_set</literal> is a boolean value corresponding to the
-resultSetIndicator field in the protocol.
-<literal>Num_bases/basenames</literal> is a length of/array of character
-pointers to the database names provided by the client. The
-<literal>query</literal> is the full query structure as defined in the
-protocol ASN.1 specification. It can be either of the possible query
-types, and it's up to you to determine if you can handle the provided
-query type. Rather than reproduce the C interface here, we'll refer you
-to the structure definitions in the file
-<filename>include/yaz/proto.h</filename>. If you want to look at the
+The <function>bend_search</function> handler is a fairly close
+approximation of a protocol Search Request - and Response PDUs
+The <literal>setname</literal> is the resultSetName from the protocol.
+You are required to establish a mapping between the set name and whatever
+your backend database likes to use.
+Similarly, the <literal>replace_set</literal> is a boolean value
+corresponding to the resultSetIndicator field in the protocol.
+<literal>num_bases/basenames</literal> is a length of/array of character
+pointers to the database names provided by the client.
+The <literal>query</literal> is the full query structure as defined in the
+protocol ASN.1 specification.
+It can be either of the possible query types, and it's up to you to
+determine if you can handle the provided query type.
+Rather than reproduce the C interface here, we'll refer you to the
+structure definitions in the file
+<filename>include/yaz/z-core.h</filename>. If you want to look at the
attributeSetId OID of the RPN query, you can either match it against
your own internal tables, or you can use the
<literal>oid_getentbyoid</literal> function provided by &yaz;.
</para>
<para>
-The result structure contains a number of hits, and an
+The structure contains a number of hits, and an
<literal>errcode/errstring</literal> pair. If an error occurs
during the search, or if you're unhappy with the request, you should
set the errcode to a value from the BIB-1 diagnostic set. The value
defined error codes, and the suggested uses of the addinfo field.
</para>
-<synopsis>
-bend_fetchresult *bend_fetch(void *handle, bend_fetchrequest *r,
- int *fd);
-bend_fetchresult *bend_fetchresponse(void *handle);
-
-typedef struct bend_fetchrequest
-{
- char *setname; /* set name */
- int number; /* record number */
- oid_value format;
-} bend_fetchrequest;
-typedef struct bend_fetchresult
-{
- char *basename; /* name of database that provided record */
- int len; /* length of record */
- char *record; /* record */
- int last_in_set; /* is it? */
- oid_value format;
- int errcode; /* 0==success */
- char *errstring; /* system error string or NULL */
-} bend_fetchresult;
+<synopsis>
+int (*bend_fetch) (void *handle, bend_fetch_rr *rr);
+
+typedef struct bend_fetch_rr {
+ char *setname; /* set name */
+ int number; /* record number */
+ Z_ReferenceId *referenceId;/* reference ID */
+ oid_value request_format; /* One of the CLASS_RECSYN members */
+ int *request_format_raw; /* same as above (raw OID) */
+ Z_RecordComposition *comp; /* Formatting instructions */
+ ODR stream; /* encoding stream - memory source if req */
+ ODR print; /* printing stream */
+
+ char *basename; /* name of database that provided record */
+ int len; /* length of record or -1 if structured */
+ char *record; /* record */
+ int last_in_set; /* is it? */
+ oid_value output_format; /* format */
+ int *output_format_raw; /* used instead of above if not-null */
+ int errcode; /* 0==success */
+ char *errstring; /* system error string or NULL */
+ int surrogate_flag; /* surrogate diagnostic */
+} bend_fetch_rr;
</synopsis>
-<note>
-<para>
-The <function>bend_fetchresponse()</function> function is not yet supported
-in this version of the software. Your implementation of
-<function>bend_fetch()</function> should always return a pointer to a
-<literal>bend_fetchresult</literal>.
-</para>
-</note>
-
<para>
-The frontend server calls <function>bend_fetch</function> when it needs
-database records to fulfill a searchRequest or a presentRequest.
+The frontend server calls the <function>bend_fetch</function> handler when
+it needs database records to fulfill a Search Request or a Present Request.
The <literal>setname</literal> is simply the name of the result set
that holds the reference to the desired record.
The <literal>number</literal> is the offset into the set (with 1
</para>
<para>
-In the result structure, the <literal>basename</literal> is the name of the
+In the structure, the <literal>basename</literal> is the name of the
database that holds the
record. <literal>len</literal> is the length of the record returned, in
bytes, and <literal>record</literal> is a pointer to the record.
<literal>Last_in_set</literal> should be nonzero only if the record
returned is the last one in the given result set. <literal>errcode</literal>
-and <literal>errstring</literal>, if given, will currently be
-interpreted as a global error pertaining to the set, and will be returned in a
-nonSurrogateDiagnostic.
+and <literal>errstring</literal>, if given, will be
+interpreted as a global error pertaining to the set, and will be returned
+in a non-surrogate-diagnostic. If you wish to return the error as a
+surrogate-diagnostic (local error) you can do this by setting
+<literal>surrogate_flag</literal> to 1 also.
</para>
-<note>
-<para>
-This is silly. Add a flag to say which is which.
-</para>
-</note>
-
<para>
If the <literal>len</literal> field has the value -1, then
<literal>record</literal> is assumed to point to a constructed data
</note>
<synopsis>
-bend_deleteresult *bend_delete(void *handle, bend_deleterequest *r,
- int *fd);
-bend_deleteresult *bend_deleteresponse(void *handle);
+int (*bend_present) (void *handle, bend_present_rr *rr);
+
+typedef struct {
+ char *setname; /* set name */
+ int start;
+ int number; /* record number */
+ oid_value format; /* One of the CLASS_RECSYN members */
+ Z_ReferenceId *referenceId;/* reference ID */
+ Z_RecordComposition *comp; /* Formatting instructions */
+ ODR stream; /* encoding stream - memory source if required */
+ ODR print; /* printing stream */
+ bend_request request;
+ bend_association association;
+
+ int hits; /* number of hits */
+ int errcode; /* 0==OK */
+ char *errstring; /* system error string or NULL */
+} bend_present_rr;
+</synopsis>
-typedef struct bend_deleterequest
-{
- char *setname;
-} bend_deleterequest;
+<para>
+The <function>bend_present</function> handler is called when
+the server receives a Present Request. The <literal>setname</literal>,
+<literal>start</literal> and <literal>number</literal> is the
+name of the result set - start position - and number of records to
+be retrieved respectively. <literal>format</literal> and
+<literal>comp</literal> is the preferred transfer syntax and element
+specifications of the present request.
+</para>
+<para>
+Note that this is handler serves as a supplement for
+<function>bend_fetch</function> and need not to be defined in order to
+support search - and retrieve.
+</para>
-typedef struct bend_deleteresult
-{
- int errcode; /* 0==success */
- char *errstring; /* system error string or NULL */
-} bend_deleteresult;
-</synopsis>
+</sect2>
+
+<sect2><title>Delete</title>
-<note>
<para>
-The "delete" function is not yet supported in this version of
-the software.
+For backends that supports delete of a result set only one handler
+must be defined.
</para>
-</note>
+
+<synopsis>
+int (*bend_delete)(void *handle, bend_delete_rr *rr);
+
+typedef struct bend_delete_rr {
+ int function;
+ int num_setnames;
+ char **setnames;
+ Z_ReferenceId *referenceId;
+ int delete_status; /* status for the whole operation */
+ int *statuses; /* status each set - indexed as setnames */
+ ODR stream;
+ ODR print;
+} bend_delete_rr;
+</synopsis>
<note>
<para>
</para>
</note>
+</sect2>
+
+<sect2><title>scan</title>
+
+<para>
+For servers that wish to offer the scan service one handler
+must be defined.
+</para>
+
<synopsis>
-bend_scanresult *bend_scan(void *handle, bend_scanrequest *r,
- int *fd);
-bend_scanresult *bend_scanresponse(void *handle);
+int (*bend_delete)(void *handle, bend_delete_rr *rr);
-typedef struct bend_scanrequest
-{
+typedef enum {
+ BEND_SCAN_SUCCESS, /* ok */
+ BEND_SCAN_PARTIAL /* not all entries could be found */
+} bend_scan_status;
+
+typedef struct bend_scan_rr {
int num_bases; /* number of elements in databaselist */
char **basenames; /* databases to search */
+ oid_value attributeset;
+ Z_ReferenceId *referenceId; /* reference ID */
Z_AttributesPlusTerm *term;
- int term_position; /* desired index of term in result list */
- int num_entries; /* number of entries requested */
-} bend_scanrequest;
+ ODR stream; /* encoding stream - memory source if required */
+ ODR print; /* printing stream */
-typedef struct bend_scanresult
-{
- int num_entries;
- struct scan_entry
- {
- char *term;
- int occurrences;
- } *entries;
- int term_position;
- enum
- {
- BEND_SCAN_SUCCESS,
- BEND_SCAN_PARTIAL
- } status;
+ int *step_size; /* step size */
+ int term_position; /* desired index of term in result list/returned */
+ int num_entries; /* number of entries requested/returned */
+
+ struct scan_entry *entries;
+ bend_scan_status status;
int errcode;
char *errstring;
-} bend_scanresult;
+} bend_scan_rr;
</synopsis>
-
-<note>
-<para>
-The <function>bend_scanresponse()</function> function is not yet supported
-in this version of the software. Your implementation of
-<function>bend_scan()</function> should always return a pointer to a
-<literal>bend_scanresult</literal>.
-</para>
-</note>
+</sect2>
</sect1>
<sect1><title>Application Invocation</title>
</para>
<synopsis>
-appname [-szSu -a apdufile -l logfile -v loglevel]
+<replaceable>appname</replaceable> [-szSiTu -a <replaceable>apdufile</replaceable> -l <replaceable>logfile</replaceable> -v <replaceable>loglevel</replaceable> -c <replaceable>config</replaceable>]
[listener ...]
</synopsis>
<varlistentry><term>-S</term>
<listitem><para>
-Don't fork on connection requests. This is good for debugging, but
-not recommended for real operation: Although the server is
+Don't fork or make threads on connection requests. This is good for
+debugging, but not recommended for real operation: Although the server is
asynchronous and non-blocking, it can be nice to keep a software
malfunction (okay then, a crash) from affecting all current users.
</para></listitem></varlistentry>
+<varlistentry><term>-T</term>
+<listitem><para>
+Operate the server in threaded mode. The server creates a thread
+for each connection rather than a fork a process. Only available
+on UNIX systems that offers POSIX threads.
+</para></listitem></varlistentry>
+
<varlistentry><term>-s</term>
<listitem><para>
-Use the SR protocol.
+Use the SR protocol (obsolete).
</para></listitem></varlistentry>
<varlistentry><term>-z</term>
<listitem><para>
Use the Z39.50 protocol (default). These two options complement
-eachother. You can use both multiple times on the same command
+each other. You can use both multiple times on the same command
line, between listener-specifications (see below). This way, you
can set up the server to listen for connections in both protocols
concurrently, on different local ports.
<listitem><para>The logfile.
</para></listitem></varlistentry>
+<varlistentry><term>-c <replaceable>config</replaceable></term>
+<listitem><para>A user option that serves as a specifier for some
+sort of configuration, e.g. a filename.
+The argument to this option is transferred to member
+<literal>configname</literal>of the <literal>statserv_options_block</literal>.
+</para></listitem></varlistentry>
+
<varlistentry><term>-v <replaceable>level</replaceable></term>
<listitem><para>
The log level. Use a comma-separated list of members of the set
Maximum record size/message size, in kilobytes.
</para></listitem></varlistentry>
+
</variablelist>
</para>
</para>
</sect1>
-<sect1><title>Summary and Synopsis</title>
-
-<synopsis>
-#include <backend.h>
-
-bend_initresult *bend_init(bend_initrequest *r);
-
-bend_searchresult *bend_search(void *handle, bend_searchrequest *r,
- int *fd);
-
-bend_searchresult *bend_searchresponse(void *handle);
-
-bend_fetchresult *bend_fetch(void *handle, bend_fetchrequest *r,
- int *fd);
-
-bend_fetchresult *bend_fetchresponse(void *handle);
-
-bend_scanresult *bend_scan(void *handle, bend_scanrequest *r, int *fd);
-
-bend_scanresult *bend_scanresponse(void *handle);
-
-bend_deleteresult *bend_delete(void *handle, bend_deleterequest *r,
- int *fd);
-
-bend_deleteresult *bend_deleteresponse(void *handle);
-
-void bend_close(void *handle);
-</synopsis>
-</sect1>
</chapter>
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