Resolver: retry sending queries on errors (ticket #1511). Errors when sending UDP datagrams can happen, e.g., when local IP address changes (see fa0e093b64d7), or an unavailable DNS server on the LAN can cause send() to fail with EHOSTDOWN on BSD systems. If this happens during initial query, retry sending immediately, to a different DNS server when possible. If this is not enough, allow normal resend to happen by ignoring the return code of the second ngx_resolver_send_query() call, much like we do in ngx_resolver_resend().

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGINX_H_INCLUDED_
#define _NGINX_H_INCLUDED_


#define nginx_version      1015002
#define NGINX_VERSION      "1.15.2"
#define NGINX_VER          "nginx/" NGINX_VERSION

#ifdef NGX_BUILD
#define NGINX_VER_BUILD    NGINX_VER " (" NGX_BUILD ")"
#else
#define NGINX_VER_BUILD    NGINX_VER
#endif

#define NGINX_VAR          "NGINX"
#define NGX_OLDPID_EXT     ".oldbin"


#endif /* _NGINX_H_INCLUDED_ */