Use getdtablesize to set MAX_NO_OF_CONNECTIONS if HAVE_GETDTABLESIZE

is defined in <m-config.h>.

src/include/config.h

@@ -7,6 +7,7 @@
  *  the server, and lots of constants and configuration options.
  */
 
+#include <m-config.h>
 
 #define DEBUG			/* We're still debugging and want traces. */
 
@@ -109,8 +110,44 @@ extern const int MAX_CREA_MISC;   /* Sum of recipients, cc_recipients, comm_to
 /*
  * Some other limits
  */
-extern const int MAX_NO_OF_CONNECTIONS;	/* the maximum number of persons
-					 * that can use Kom simultaneously */
+
+
+/*
+ * MAX_NO_OF_CONNECTIONS must be small enough. Each connection takes one
+ * file descriptor, and it is important that there are a few descriptors
+ * left so that it is possible to save the data base. lyskomd might crash
+ * if this number is too big and that many connectionattempts are made
+ * simultaneously.
+ *
+ * The following descriptors are open by LysKOM:
+ *   stdin, stdout, stderr   (stdin and stdout could probably be closed.
+ *			      The log() function prints to stderr.)
+ *   TEXTFILE_NAME	     (always open)
+ *   DATAFILE_NAME	     (often open)
+ *   STATISTIC_NAME	     (open after a SIGUSR1)
+ * Thus, the max number of connections is the number of available file
+ * descriptors minus six. This has not been fully tested for a long
+ * while, so we subtract eight just to be on the safe side. That still
+ * gives 56 simultaneous users on a sun4, and that is enough for the
+ * time beeing. (If you need more connections you can ran a mux. Send
+ * mail to kom@lysator.liu.se for more info.)
+ */
+
+#define PROTECTED_FDS 8
+
+/*
+ * An upper limit of how many connections to LysKOM that can be opened
+ * simultaneously. If we HAVE_GETDTABLESIZE this is set once and for
+ * all at the beginning of main(). Otherwise it is determined at
+ * compile-time.
+ */
+#ifdef HAVE_GETDTABLESIZE
+extern int MAX_NO_OF_CONNECTIONS;
+#else
+extern const int MAX_NO_OF_CONNECTIONS;
+#endif
+
+
 extern const int MARK_AS_READ_CHUNK;	/* You can't mark more than this many
 					 * texts as read in one call. */
 

src/server/ramkomd.c

@@ -7,7 +7,7 @@
  * It has grown! /ceder
  */
 
-static char *rcsid = "$Id: ramkomd.c,v 0.15 1991/08/30 01:33:51 ceder Exp $";
+static char *rcsid = "$Id: ramkomd.c,v 0.16 1991/08/30 07:07:36 ceder Exp $";
 
 
 #include <m-config.h>
@@ -220,10 +220,15 @@ main (int    argc,
     }
 #endif
 
+#ifdef HAVE_GETDTABLESIZE
+    MAX_NO_OF_CONNECTIONS = getdtablesize() - PROTECTED_FDS;
+#endif
+    /* If we don't have getdtablesize MAX_NO_OF_CONNECTIONS is
+       set at compile time. */
+
     s_set_storage_management(string_malloc, string_realloc, string_free);
 
-      
-      
+
     strcpy(ip_client_port, DEFAULT_CLIENT_SERVICE);
     strcpy(ip_mux_port,    DEFAULT_MUX_SERVICE);
 

src/server/server-config.c

@@ -8,7 +8,7 @@
 #include <config.h>
 #include <m-config.h>
 
-static char *rcsid = "$Id: server-config.c,v 0.9 1991/08/30 01:32:18 ceder Exp $";
+static char *rcsid = "$Id: server-config.c,v 0.10 1991/08/30 07:07:38 ceder Exp $";
 
 
 
@@ -105,7 +105,11 @@ const int CACHE_TEXT_STATS  = 10;
  * mail to kom@lysator.liu.se for more info.)
  */
 
-const int MAX_NO_OF_CONNECTIONS = (MAX_OPEN_FD - 8);
+#ifdef HAVE_GETDTABLESIZE
+int MAX_NO_OF_CONNECTIONS = 0;	/* Initialized by main(). */
+#else
+const int MAX_NO_OF_CONNECTIONS = (MAX_OPEN_FD - PROTECTED_FDS);
+#endif
 
 
 const int MARK_AS_READ_CHUNK    = 128;	/* You can't mark more than this many