Allow to configure the length of the backlog queue for TCP servers

New statement backlog is provided in the server block.

* include/mailutils/server.h (mu_m_server_cfg_init): Pass
mu_m_server_t as first argument.
* libmailutils/server/msrv.c (mu_m_server_cfg_init): Pass
mu_m_server_t as first argument. Customize available statements
depending on the type of server (tcp vs udp).
New statement "backlog" available for tcp servers.

* comsat/comsat.c: Update call to mu_m_server_cfg_init
* imap4d/imap4d.c: Likewise.
* pop3d/pop3d.c: Likewise.
* maidag/maidag.c: Likewise.

@@ -566,7 +566,6 @@ main (int argc, char **argv)
   mu_argp_init (NULL, NULL);
   comsat_init ();
   mu_acl_cfg_init ();
-  mu_m_server_cfg_init (NULL);
   mu_m_server_create (&server, program_version);
   mu_m_server_set_type (server, MU_IP_UDP);
   mu_m_server_set_conn (server, comsat_connection);
@@ -575,6 +574,8 @@ main (int argc, char **argv)
   mu_m_server_set_max_children (server, 20);
   /* FIXME mu_m_server_set_pidfile (); */
   mu_m_server_set_default_port (server, 512);
+  mu_m_server_cfg_init (server, NULL);
+  
   /* FIXME: timeout is not needed. How to disable it? */
   mu_log_syslog = 1;
   

@@ -942,7 +942,6 @@ main (int argc, char **argv)
   mu_tcpwrapper_cfg_init ();
   manlock_cfg_init ();
   mu_acl_cfg_init ();
-  mu_m_server_cfg_init (imap4d_srv_param);
   
   mu_argp_init (NULL, NULL);
 
@@ -956,6 +955,7 @@ main (int argc, char **argv)
   mu_m_server_set_default_port (server, 143);
   mu_m_server_set_timeout (server, 1800);  /* RFC2060: 30 minutes. */
   mu_m_server_set_strexit (server, mu_strexit);
+  mu_m_server_cfg_init (server, imap4d_srv_param);
   
   mu_alloc_die_hook = imap4d_alloc_die;
 

@@ -142,7 +142,7 @@ void mu_m_server_stop (int code);
 int mu_m_server_check_acl (mu_m_server_t msrv, struct sockaddr *s, int salen);
 
 struct mu_cfg_param;
-void mu_m_server_cfg_init (struct mu_cfg_param *app_param);
+void mu_m_server_cfg_init (mu_m_server_t msrv, struct mu_cfg_param *app_param);
 
 
 #endif

@@ -24,6 +24,7 @@
 #endif
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
@@ -932,8 +933,32 @@ static struct mu_cfg_param server_cfg_param[] = {
   { NULL }
 };
 
+static int
+_cb_backlog (void *data, mu_config_value_t *val)
+{
+  mu_ip_server_t *psrv = data;
+  int backlog;
+  
+  if (mu_cfg_assert_value_type (val, MU_CFG_STRING))
+    return 1;
+  if (sscanf (val->v.string, "%d", &backlog) != 1 || backlog <= 0
+      || mu_tcp_server_set_backlog (*psrv, backlog))
+    {
+      mu_error (_("invalid argument"));
+      return 1;
+    }
+  return 0;
+}
+
+static struct mu_cfg_param server_tcp_param[] = {
+  { "backlog", mu_cfg_callback,
+    NULL, mu_offsetof (struct mu_srv_config, tcpsrv), _cb_backlog,
+    N_("Size of the queue of pending connections") },
+  { NULL }
+};
+
 void
-mu_m_server_cfg_init (struct mu_cfg_param *app_param)
+mu_m_server_cfg_init (mu_m_server_t srv, struct mu_cfg_param *app_param)
 {
   struct mu_cfg_section *section;
   if (mu_create_canned_section ("server", &section) == 0)
@@ -941,6 +966,8 @@ mu_m_server_cfg_init (struct mu_cfg_param *app_param)
       section->parser = server_section_parser;
       section->label = N_("ipaddr[:port]");
       mu_cfg_section_add_params (section, server_cfg_param);
+      if (srv->deftype == MU_IP_TCP)
+	mu_cfg_section_add_params (section, server_tcp_param);
       if (app_param)
 	mu_cfg_section_add_params (section, app_param);
     }

@@ -522,7 +522,6 @@ main (int argc, char *argv[])
 
   mu_tcpwrapper_cfg_init ();
   mu_acl_cfg_init ();
-  mu_m_server_cfg_init (NULL);
   maidag_cfg_init ();
   
   /* Parse command line */
@@ -537,6 +536,7 @@ main (int argc, char *argv[])
   mu_m_server_set_mode (server, MODE_INTERACTIVE);
   mu_m_server_set_max_children (server, 20);
   mu_m_server_set_timeout (server, 600);
+  mu_m_server_cfg_init (server, NULL);
 
   mu_log_syslog = -1;
   mu_log_print_severity = 1;

@@ -575,7 +575,6 @@ main (int argc, char **argv)
   mu_tcpwrapper_cfg_init ();
   manlock_cfg_init ();
   mu_acl_cfg_init ();
-  mu_m_server_cfg_init (pop3d_srv_param);
   
   mu_argp_init (NULL, NULL);
   	
@@ -589,6 +588,7 @@ main (int argc, char **argv)
   mu_m_server_set_default_port (server, 110);
   mu_m_server_set_timeout (server, 600);
   mu_m_server_set_strexit (server, mu_strexit);
+  mu_m_server_cfg_init (server, pop3d_srv_param);
 
   mu_alloc_die_hook = pop3d_alloc_die;