* Sebastian Hammer, Adam Dickmeiss
*
* $Log: statserv.c,v $
- * Revision 1.5 1995-03-15 08:37:45 quinn
+ * Revision 1.10 1995-03-29 15:40:16 quinn
+ * Ongoing work. Statserv is now dynamic by default
+ *
+ * Revision 1.9 1995/03/27 08:34:30 quinn
+ * Added dynamic server functionality.
+ * Released bindings to session.c (is now redundant)
+ *
+ * Revision 1.8 1995/03/20 09:46:26 quinn
+ * Added osi support.
+ *
+ * Revision 1.7 1995/03/16 13:29:04 quinn
+ * Partitioned server.
+ *
+ * Revision 1.6 1995/03/15 15:18:52 quinn
+ * Little changes to better support nonblocking I/O
+ * Added backend.h
+ *
+ * Revision 1.5 1995/03/15 08:37:45 quinn
* Now we're pretty much set for nonblocking I/O.
*
* Revision 1.4 1995/03/14 16:59:48 quinn
*/
#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <errno.h>
#include <options.h>
#include <eventl.h>
#include <comstack.h>
#include <tcpip.h>
#include <xmosi.h>
+#include <dmalloc.h>
static char *me = "";
+static int dynamic = 1; /* fork on incoming connection */
#define DEFAULT_LISTENER "tcp:localhost:9999"
/*
* handle incoming connect requests.
+ * The dynamic mode is a bit tricky mostly because we want to avoid
+ * doing all of the listening and accepting in the parent - it's
+ * safer that way.
*/
-void listener(IOCHAN h, int event)
+static void listener(IOCHAN h, int event)
{
COMSTACK line = (COMSTACK) iochan_getdata(h);
association *newas;
+ static int hand[2];
+ static int child = 0;
+ int res;
if (event == EVENT_INPUT)
{
- if (cs_listen(line, 0, 0) < 0)
+ if (dynamic && !child)
{
- if (cs_errno(line) == CSNODATA)
+ int res;
+
+ if (pipe(hand) < 0)
+ {
+ perror("pipe");
+ exit(1);
+ }
+ if ((res = fork()) < 0)
+ {
+ perror("fork");
+ exit(1);
+ }
+ else if (res == 0) /* child */
+ {
+ close(hand[0]);
+ child = 1;
+ }
+ else /* parent */
+ {
+ close(hand[1]);
+ /* wait for child to take the call */
+ for (;;)
+ {
+ char dummy[1];
+ int res;
+
+ if ((res = read(hand[0], dummy, 1)) < 0 && errno != EINTR)
+ {
+ perror("handshake read");
+ exit(1);
+ }
+ else if (res >= 0)
+ break;
+ }
+ fprintf(stderr, "P: Child has taken the call\n");
+ close(hand[0]);
return;
+ }
+ }
+ if ((res = cs_listen(line, 0, 0)) < 0)
+ {
fprintf(stderr, "cs_listen failed.\n");
- exit(1);
+ return;
}
+ else if (res == 1)
+ return;
iochan_setevent(h, EVENT_OUTPUT);
iochan_setflags(h, EVENT_OUTPUT | EVENT_EXCEPT); /* set up for acpt */
}
+ /* in dynamic mode, only the child ever comes down here */
else if (event == EVENT_OUTPUT)
{
COMSTACK new_line;
IOCHAN new_chan;
- if (!(new_line = cs_accept(line)))
- {
+ if (!(new_line = cs_accept(line)))
+ {
fprintf(stderr, "Accept failed.\n");
- exit(1);
+ iochan_setflags(h, EVENT_INPUT | EVENT_EXCEPT); /* reset listener */
+ return;
+ }
+ if (dynamic)
+ {
+ IOCHAN pp;
+ /* close our half of the listener sockets */
+ for (pp = iochan_getchan(); pp; pp = iochan_getnext(pp))
+ {
+ COMSTACK l = iochan_getdata(pp);
+ cs_close(l);
+ iochan_destroy(pp);
+ }
+ /* release dad */
+ fprintf(stderr, "Releasing parent\n");
+ close(hand[1]);
+ fprintf(stderr, "New fd is %d\n", cs_fileno(new_line));
}
+ else
+ iochan_setflags(h, EVENT_INPUT | EVENT_EXCEPT); /* reset listener */
+
if (!(new_chan = iochan_create(cs_fileno(new_line), ir_session,
EVENT_INPUT)))
{
exit(1);
}
iochan_setdata(new_chan, newas);
- iochan_setflags(h, EVENT_INPUT | EVENT_EXCEPT); /* reset for listen */
}
else
{
/*
* Set up a listening endpoint, and give it to the event-handler.
*/
-void add_listener(char *where)
+static void add_listener(char *where, int what)
{
COMSTACK l;
CS_TYPE type;
void *ap;
IOCHAN lst;
- fprintf(stderr, "Adding listener on %s\n", where);
+ fprintf(stderr, "Adding %s %s listener on %s\n",
+ dynamic ? "dynamic" : "static",
+ what == PROTO_SR ? "SR" : "Z3950", where);
if (!where || sscanf(where, "%[^:]:%s", mode, addr) != 2)
{
fprintf(stderr, "%s: Address format: ('tcp'|'osi')':'<address>.\n",
}
type = tcpip_type;
}
-#if 0
else if (!strcmp(mode, "osi"))
{
if (!(ap = mosi_strtoaddr(addr)))
}
type = mosi_type;
}
-#endif
else
{
fprintf(stderr, "You must specify either 'osi:' or 'tcp:'.\n");
exit(1);
}
- if (!(l = cs_create(type, 1)))
+ if (!(l = cs_create(type, 0, what)))
{
fprintf(stderr, "Failed to create listener\n");
exit(1);
iochan_setdata(lst, l);
}
-int main(int argc, char **argv)
+static void catchchld(int num)
+{
+ while (waitpid(-1, 0, WNOHANG) > 0);
+ signal(SIGCHLD, catchchld);
+}
+
+int statserv_main(int argc, char **argv)
{
int ret, listeners = 0;
char *arg;
+ int protocol = CS_Z3950;;
me = argv[0];
- while ((ret = options("l:", argv, argc, &arg)) != -2)
+ while ((ret = options("szSl:", argv, argc, &arg)) != -2)
switch (ret)
{
- case 0: me = arg; break;
- case 'l': add_listener(arg); listeners++; break;
+ case 0:
+ add_listener(arg, protocol);
+ listeners++;
+ break;
+ case 'z': protocol = CS_Z3950; break;
+ case 's': protocol = CS_SR; break;
+ case 'S': dynamic = 0; break;
default:
- fprintf(stderr, "Usage: %s [-l <listener-addr>]\n", me);
+ fprintf(stderr, "Usage: %s [ -zsS <listener-addr> ... ]\n", me);
exit(1);
}
+ if (dynamic)
+ signal(SIGCHLD, catchchld);
if (!listeners)
- add_listener(DEFAULT_LISTENER);
+ add_listener(DEFAULT_LISTENER, protocol);
return event_loop();
}
projects / yaz-moved-to-github.git / blobdiff