As mentioned, your main() routine can be quite brief.
If you want to initialize global parameters, or read global configuration
tables, this is the place to do it. At the end of the routine, you should
call the function
int statserv_main(int argc, char **argv,
bend_initresult *(*bend_init)(bend_initrequest *r),
void (*bend_close)(void *handle));
|
The third and fourth arguments are pointers to handlers. Handler
bend_init is called whenever the server receives
an Initialize Request, so it serves as a Z39.50 session initializer. The
bend_close handler is called when the session is
closed.
statserv_main will establish listening sockets
according to the parameters given. When connection requests are received,
the event handler will typically fork() 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
disable forking by command line parameters.
The server provides a mechanism for controlling some of its behavior
without using command-line options. The function
statserv_options_block *statserv_getcontrol(void);
|
will return a pointer to a struct statserv_options_block
describing the current default settings of the server. The structure
contains these elements:
- int dynamic
A boolean value, which determines whether the server
will fork on each incoming request (TRUE), or not (FALSE). Default is
TRUE. This flag is only read by UNIX-based servers (WIN32 based servers
doesn't fork).
- int threads
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.
- int inetd
A boolean value, which determines whether the server
will operates under a UNIX INET daemon (inetd). Default is FALSE.
- int loglevel
Set this by ORing the constants defined in
include/yaz/yaz-log.h.
- char logfile[ODR_MAXNAME+1]
File for diagnostic output ("": stderr).
- char apdufile[ODR_MAXNAME+1]
Name of file for logging incoming and outgoing APDUs
("": don't log APDUs, "-":
stderr).
- char default_listen[1024]
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.
- enum oid_proto default_proto;
Either PROTO_Z3950 or
PROTO_SR.
Default is PROTO_Z39_50.
- int idle_timeout;
Maximum session idle-time, in minutes. Zero indicates
no (infinite) timeout. Default is 120 minutes.
- int maxrecordsize;
Maximum permissible record (message) size. Default
is 1Mb. This amount of memory will only be allocated if a
client requests a very large amount of records in one operation
(or a big record).
Set it to a lower number if you are worried about resource
consumption on your host system.
- char configname[ODR_MAXNAME+1]
Passed to the backend when a new connection is received.
- char setuid[ODR_MAXNAME+1]
Set user id to the user specified, after binding
the listener addresses.
- void (*bend_start)(struct statserv_options_block *p)
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.
- void (*bend_stop)(struct statserv_options_block *p)
Pointer to function which is called whenever 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.
- void *handle
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.
The pointer returned by statserv_getcontrol points to
a static area. You are allowed to change the contents of the structure,
but the changes will not take effect before you call
void statserv_setcontrol(statserv_options_block *block);
|
Note:
that you should generally update this structure before calling
statserv_main().