Mercurial > hg > nginx-quic
view src/mysql/ngx_mysql.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 | d620f497c50f |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_MYSQL_H_INCLUDED_ #define _NGX_MYSQL_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> #include <ngx_event_connect.h> typedef struct ngx_mysql_s ngx_mysql_t; typedef void (*ngx_mysql_handler_pt)(ngx_mysql_t *m); struct ngx_mysql_s { ngx_peer_connection_t peer; ngx_buf_t *buf; ngx_pool_t *pool; ngx_str_t *login; ngx_str_t *passwd; ngx_str_t *database; ngx_str_t query; ngx_uint_t pktn; ngx_mysql_handler_pt handler; void *data; ngx_int_t state; }; #define NGX_MYSQL_CMDPKT_LEN 5 #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED && 0) #define ngx_m16toh(n) (*(uint32_t *) n & 0x0000ffff) #define ngx_m24toh(n) (*(uint32_t *) n & 0x00ffffff) #define ngx_m32toh(n) *(uint32_t *) n #define ngx_htom16(n, m) *(uint16_t *) n = (uint16_t) ((m) & 0xffff) #define ngx_htom24(n, m) (n)[0] = (u_char) ((m) & 0xff); \ (n)[1] = (u_char) (((m) >> 8) & 0xff); \ (n)[2] = (u_char) (((m) >> 16) & 0xff) #define ngx_htom32(n, m) *(uint32_t *) (n) = (m) #else #define ngx_m16toh(n) (n[0] | n[1] << 8) #define ngx_m24toh(n) (n[0] | n[1] << 8 | n[2] << 16) #define ngx_m32toh(n) (n[0] | n[1] << 8 | n[2] << 16 | n[3] << 24) #define ngx_htom16(n, m) (n)[0] = (u_char) (m); (n)[1] = (u_char) ((m) >> 8) #define ngx_htom24(n, m) (n)[0] = (u_char) ((m) & 0xff); \ (n)[1] = (u_char) (((m) >> 8) & 0xff); \ (n)[2] = (u_char) (((m) >> 16) & 0xff) #define ngx_htom32(n, m) (n)[0] = (u_char) ((m) & 0xff); \ (n)[1] = (u_char) (((m) >> 8) & 0xff); \ (n)[2] = (u_char) (((m) >> 16) & 0xff); \ (n)[3] = (u_char) (((m) >> 24) & 0xff) #endif ngx_int_t ngx_mysql_connect(ngx_mysql_t *m); ngx_int_t ngx_mysql_query(ngx_mysql_t *m); #endif /* _NGX_MYSQL_H_INCLUDED_ */