$hostname variable

src/core/ngx_config.h

diff --git a/src/core/ngx_config.h b/src/core/ngx_config.h
index a6a9f5d..8b802aa 100644
--- a/src/core/ngx_config.h
+++ b/src/core/ngx_config.h
@@ -116,10 +116,11 @@
 #define INET_ADDRSTRLEN  16
 #endif
 
-#define NGX_MAXHOSTNAMELEN 64
-/*
-#define NGX_MAXHOSTNAMELEN MAXHOSTNAMELEN
-*/
+#ifdef MAXHOSTNAMELEN
+#define NGX_MAXHOSTNAMELEN  MAXHOSTNAMELEN
+#else
+#define NGX_MAXHOSTNAMELEN  256
+#endif
 
 
 #if ((__GNU__ == 2) && (__GNUC_MINOR__ < 8))

src/core/ngx_cycle.c

diff --git a/src/core/ngx_cycle.c b/src/core/ngx_cycle.c
index edcb6b5..9cdbb2d 100644
--- a/src/core/ngx_cycle.c
+++ b/src/core/ngx_cycle.c
@@ -57,6 +57,7 @@
     ngx_listening_t     *ls, *nls;
     ngx_core_conf_t     *ccf, *old_ccf;
     ngx_core_module_t   *module;
+    char                 hostname[NGX_MAXHOSTNAMELEN];
 
     log = old_cycle->log;
 
@@ -170,6 +171,26 @@
     }
 
 
+    if (gethostname(hostname, NGX_MAXHOSTNAMELEN) == -1) {
+        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "gethostname() failed");
+        ngx_destroy_pool(pool);
+        return NULL;
+    }
+
+    /* on Linux gethostname() silently truncates name that does not fit */
+
+    hostname[NGX_MAXHOSTNAMELEN - 1] = '\0';
+    cycle->hostname.len = ngx_strlen(hostname);
+
+    cycle->hostname.data = ngx_palloc(pool, cycle->hostname.len);
+    if (cycle->hostname.data == NULL) {
+        ngx_destroy_pool(pool);
+        return NULL;
+    }
+
+    ngx_memcpy(cycle->hostname.data, hostname, cycle->hostname.len);
+
+
     for (i = 0; ngx_modules[i]; i++) {
         if (ngx_modules[i]->type != NGX_CORE_MODULE) {
             continue;

src/core/ngx_cycle.h

diff --git a/src/core/ngx_cycle.h b/src/core/ngx_cycle.h
index 820ebbe..845ce87 100644
--- a/src/core/ngx_cycle.h
+++ b/src/core/ngx_cycle.h
@@ -62,6 +62,7 @@
     ngx_str_t                 conf_file;
     ngx_str_t                 root;
     ngx_str_t                 lock_file;
+    ngx_str_t                 hostname;
 };