Merge of r4985, r4986, r4987, r4988, r4989, r5002: access_log gzip. *) Access log: fixed redundant buffer reallocation. Previously a new buffer was allocated for every "access_log" directive with the same file path and "buffer=" parameters, while only one buffer per file is used. *) Reopening log files code moved to a separate function. The code refactored in a way to call custom handler that can do appropriate cleanup work (if any), like flushing buffers, finishing compress streams, finalizing connections to log daemon, etc.. *) Access log: the "flush" parameter of the "access_log" directive. *) Configure: added the NGX_ZLIB define. This was introduced for conditional compilation of the code that requires the zlib library. *) Access log: the "gzip" parameter of the "access_log" directive. Note: this requires zlib version 1.2.0.4 or above to work. *) The data pointer in ngx_open_file_t objects must be initialized. Uninitialized pointer may result in arbitrary segfaults if access_log is used without buffer and without variables in file path. Patch by Tatsuhiko Kubo (ticket #268).

--- a/src/core/ngx_conf_file.h
+++ b/src/core/ngx_conf_file.h
@@ -91,17 +91,8 @@ struct ngx_open_file_s {
     ngx_fd_t              fd;
     ngx_str_t             name;
 
-    u_char               *buffer;
-    u_char               *pos;
-    u_char               *last;
-
-#if 0
-    /* e.g. append mode, error_log */
-    ngx_uint_t            flags;
-    /* e.g. reopen db file */
-    ngx_uint_t          (*handler)(void *data, ngx_open_file_t *file);
+    void                (*flush)(ngx_open_file_t *file, ngx_log_t *log);
     void                 *data;
-#endif
 };