Mercurial > hg > nginx
view src/stream/ngx_stream.h @ 6133:af7eba90645d
Win32: shared memory base addresses and remapping.
Two mechanisms are implemented to make it possible to store pointers
in shared memory on Windows, in particular on Windows Vista and later
versions with ASLR:
- The ngx_shm_remap() function added to allow remapping of a shared memory
zone to the address originally used for it in the master process. While
important, it doesn't solve the problem by itself as in many cases it's
not possible to use the address because of conflicts with other
allocations.
- We now create mappings at the same address in all processes by starting
mappings at predefined addresses normally unused by newborn processes.
These two mechanisms combined allow to use shared memory on Windows
almost without problems, including reloads.
Based on the patch by Sergey Brester:
http://mailman.nginx.org/pipermail/nginx-devel/2015-April/006836.html
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 27 Apr 2015 18:25:42 +0300 |
parents | 187aa751ad62 |
children | 4f6efabcb09b |
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/* * Copyright (C) Roman Arutyunyan * Copyright (C) Nginx, Inc. */ #ifndef _NGX_STREAM_H_INCLUDED_ #define _NGX_STREAM_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #if (NGX_STREAM_SSL) #include <ngx_stream_ssl_module.h> #endif typedef struct ngx_stream_session_s ngx_stream_session_t; #include <ngx_stream_upstream.h> #include <ngx_stream_upstream_round_robin.h> typedef struct { void **main_conf; void **srv_conf; } ngx_stream_conf_ctx_t; typedef struct { u_char sockaddr[NGX_SOCKADDRLEN]; socklen_t socklen; /* server ctx */ ngx_stream_conf_ctx_t *ctx; unsigned bind:1; unsigned wildcard:1; #if (NGX_STREAM_SSL) unsigned ssl:1; #endif #if (NGX_HAVE_INET6 && defined IPV6_V6ONLY) unsigned ipv6only:1; #endif unsigned so_keepalive:2; #if (NGX_HAVE_KEEPALIVE_TUNABLE) int tcp_keepidle; int tcp_keepintvl; int tcp_keepcnt; #endif } ngx_stream_listen_t; typedef struct { ngx_stream_conf_ctx_t *ctx; ngx_str_t addr_text; #if (NGX_STREAM_SSL) ngx_uint_t ssl; /* unsigned ssl:1; */ #endif } ngx_stream_addr_conf_t; typedef struct { in_addr_t addr; ngx_stream_addr_conf_t conf; } ngx_stream_in_addr_t; #if (NGX_HAVE_INET6) typedef struct { struct in6_addr addr6; ngx_stream_addr_conf_t conf; } ngx_stream_in6_addr_t; #endif typedef struct { /* ngx_stream_in_addr_t or ngx_stream_in6_addr_t */ void *addrs; ngx_uint_t naddrs; } ngx_stream_port_t; typedef struct { int family; in_port_t port; ngx_array_t addrs; /* array of ngx_stream_conf_addr_t */ } ngx_stream_conf_port_t; typedef struct { struct sockaddr *sockaddr; socklen_t socklen; ngx_stream_conf_ctx_t *ctx; unsigned bind:1; unsigned wildcard:1; #if (NGX_STREAM_SSL) unsigned ssl:1; #endif #if (NGX_HAVE_INET6 && defined IPV6_V6ONLY) unsigned ipv6only:1; #endif unsigned so_keepalive:2; #if (NGX_HAVE_KEEPALIVE_TUNABLE) int tcp_keepidle; int tcp_keepintvl; int tcp_keepcnt; #endif } ngx_stream_conf_addr_t; typedef struct { ngx_array_t servers; /* ngx_stream_core_srv_conf_t */ ngx_array_t listen; /* ngx_stream_listen_t */ } ngx_stream_core_main_conf_t; typedef void (*ngx_stream_handler_pt)(ngx_stream_session_t *s); typedef struct { ngx_stream_handler_pt handler; ngx_stream_conf_ctx_t *ctx; u_char *file_name; ngx_int_t line; ngx_log_t *error_log; } ngx_stream_core_srv_conf_t; struct ngx_stream_session_s { uint32_t signature; /* "STRM" */ ngx_connection_t *connection; off_t received; ngx_log_handler_pt log_handler; void **ctx; void **main_conf; void **srv_conf; ngx_stream_upstream_t *upstream; }; typedef struct { void *(*create_main_conf)(ngx_conf_t *cf); char *(*init_main_conf)(ngx_conf_t *cf, void *conf); void *(*create_srv_conf)(ngx_conf_t *cf); char *(*merge_srv_conf)(ngx_conf_t *cf, void *prev, void *conf); } ngx_stream_module_t; #define NGX_STREAM_MODULE 0x4d525453 /* "STRM" */ #define NGX_STREAM_MAIN_CONF 0x02000000 #define NGX_STREAM_SRV_CONF 0x04000000 #define NGX_STREAM_UPS_CONF 0x08000000 #define NGX_STREAM_MAIN_CONF_OFFSET offsetof(ngx_stream_conf_ctx_t, main_conf) #define NGX_STREAM_SRV_CONF_OFFSET offsetof(ngx_stream_conf_ctx_t, srv_conf) #define ngx_stream_get_module_ctx(s, module) (s)->ctx[module.ctx_index] #define ngx_stream_set_ctx(s, c, module) s->ctx[module.ctx_index] = c; #define ngx_stream_delete_ctx(s, module) s->ctx[module.ctx_index] = NULL; #define ngx_stream_get_module_main_conf(s, module) \ (s)->main_conf[module.ctx_index] #define ngx_stream_get_module_srv_conf(s, module) \ (s)->srv_conf[module.ctx_index] #define ngx_stream_conf_get_module_main_conf(cf, module) \ ((ngx_stream_conf_ctx_t *) cf->ctx)->main_conf[module.ctx_index] #define ngx_stream_conf_get_module_srv_conf(cf, module) \ ((ngx_stream_conf_ctx_t *) cf->ctx)->srv_conf[module.ctx_index] #define ngx_stream_cycle_get_module_main_conf(cycle, module) \ (cycle->conf_ctx[ngx_stream_module.index] ? \ ((ngx_stream_conf_ctx_t *) cycle->conf_ctx[ngx_stream_module.index]) \ ->main_conf[module.ctx_index]: \ NULL) void ngx_stream_init_connection(ngx_connection_t *c); void ngx_stream_close_connection(ngx_connection_t *c); extern ngx_module_t ngx_stream_module; extern ngx_uint_t ngx_stream_max_module; extern ngx_module_t ngx_stream_core_module; #endif /* _NGX_STREAM_H_INCLUDED_ */