$hostname variable

src/http/ngx_http_core_module.c

diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index a809470..f9b11b9 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -2606,20 +2606,7 @@
     }
 
     if (conf->server_name.data == NULL) {
-        conf->server_name.data = ngx_palloc(cf->pool, NGX_MAXHOSTNAMELEN);
-        if (conf->server_name.data == NULL) {
-            return NGX_CONF_ERROR;
-        }
-
-        if (gethostname((char *) conf->server_name.data, NGX_MAXHOSTNAMELEN)
-            == -1)
-        {
-            ngx_conf_log_error(NGX_LOG_EMERG, cf, ngx_errno,
-                               "gethostname() failed");
-            return NGX_CONF_ERROR;
-        }
-
-        conf->server_name.len = ngx_strlen(conf->server_name.data);
+        conf->server_name = cf->cycle->hostname;
 
         sn = ngx_array_push(&conf->server_names);
         if (sn == NULL) {

src/http/ngx_http_variables.c

diff --git a/src/http/ngx_http_variables.c b/src/http/ngx_http_variables.c
index c2a27a7..16f0923 100644
--- a/src/http/ngx_http_variables.c
+++ b/src/http/ngx_http_variables.c
@@ -75,6 +75,8 @@
 
 static ngx_int_t ngx_http_variable_nginx_version(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
+static ngx_int_t ngx_http_variable_hostname(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data);
 
 /*
  * TODO:
@@ -221,6 +223,9 @@
     { ngx_string("nginx_version"), NULL, ngx_http_variable_nginx_version,
       0, 0, 0 },
 
+    { ngx_string("hostname"), NULL, ngx_http_variable_hostname,
+      0, 0, 0 },
+
     { ngx_null_string, NULL, NULL, 0, 0, 0 }
 };
 
@@ -1272,6 +1277,20 @@
 }
 
 
+static ngx_int_t
+ngx_http_variable_hostname(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data)
+{
+    v->len = ngx_cycle->hostname.len;
+    v->valid = 1;
+    v->no_cacheable = 0;
+    v->not_found = 0;
+    v->data = ngx_cycle->hostname.data;
+
+    return NGX_OK;
+}
+
+
 ngx_int_t
 ngx_http_variables_add_core_vars(ngx_conf_t *cf)
 {