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844c78556b
With this change it is now possible to load modules compiled without the "--with-file-aio" configure option into nginx binary compiled with it, and vice versa, assuming both use the "--with-compat" option.
171 lines
4.9 KiB
C
171 lines
4.9 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) Nginx, Inc.
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*/
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#ifndef _NGX_BUF_H_INCLUDED_
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#define _NGX_BUF_H_INCLUDED_
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#include <ngx_config.h>
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#include <ngx_core.h>
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typedef void * ngx_buf_tag_t;
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typedef struct ngx_buf_s ngx_buf_t;
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struct ngx_buf_s {
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u_char *pos;
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u_char *last;
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off_t file_pos;
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off_t file_last;
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u_char *start; /* start of buffer */
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u_char *end; /* end of buffer */
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ngx_buf_tag_t tag;
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ngx_file_t *file;
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ngx_buf_t *shadow;
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/* the buf's content could be changed */
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unsigned temporary:1;
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/*
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* the buf's content is in a memory cache or in a read only memory
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* and must not be changed
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*/
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unsigned memory:1;
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/* the buf's content is mmap()ed and must not be changed */
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unsigned mmap:1;
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unsigned recycled:1;
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unsigned in_file:1;
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unsigned flush:1;
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unsigned sync:1;
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unsigned last_buf:1;
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unsigned last_in_chain:1;
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unsigned last_shadow:1;
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unsigned temp_file:1;
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/* STUB */ int num;
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};
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struct ngx_chain_s {
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ngx_buf_t *buf;
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ngx_chain_t *next;
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};
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typedef struct {
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ngx_int_t num;
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size_t size;
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} ngx_bufs_t;
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typedef struct ngx_output_chain_ctx_s ngx_output_chain_ctx_t;
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typedef ngx_int_t (*ngx_output_chain_filter_pt)(void *ctx, ngx_chain_t *in);
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typedef void (*ngx_output_chain_aio_pt)(ngx_output_chain_ctx_t *ctx,
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ngx_file_t *file);
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struct ngx_output_chain_ctx_s {
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ngx_buf_t *buf;
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ngx_chain_t *in;
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ngx_chain_t *free;
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ngx_chain_t *busy;
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unsigned sendfile:1;
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unsigned directio:1;
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unsigned unaligned:1;
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unsigned need_in_memory:1;
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unsigned need_in_temp:1;
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unsigned aio:1;
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#if (NGX_HAVE_FILE_AIO || NGX_COMPAT)
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ngx_output_chain_aio_pt aio_handler;
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#if (NGX_HAVE_AIO_SENDFILE || NGX_COMPAT)
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ssize_t (*aio_preload)(ngx_buf_t *file);
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#endif
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#endif
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#if (NGX_THREADS || NGX_COMPAT)
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ngx_int_t (*thread_handler)(ngx_thread_task_t *task,
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ngx_file_t *file);
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ngx_thread_task_t *thread_task;
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#endif
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off_t alignment;
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ngx_pool_t *pool;
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ngx_int_t allocated;
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ngx_bufs_t bufs;
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ngx_buf_tag_t tag;
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ngx_output_chain_filter_pt output_filter;
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void *filter_ctx;
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};
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typedef struct {
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ngx_chain_t *out;
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ngx_chain_t **last;
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ngx_connection_t *connection;
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ngx_pool_t *pool;
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off_t limit;
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} ngx_chain_writer_ctx_t;
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#define NGX_CHAIN_ERROR (ngx_chain_t *) NGX_ERROR
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#define ngx_buf_in_memory(b) (b->temporary || b->memory || b->mmap)
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#define ngx_buf_in_memory_only(b) (ngx_buf_in_memory(b) && !b->in_file)
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#define ngx_buf_special(b) \
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((b->flush || b->last_buf || b->sync) \
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&& !ngx_buf_in_memory(b) && !b->in_file)
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#define ngx_buf_sync_only(b) \
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(b->sync \
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&& !ngx_buf_in_memory(b) && !b->in_file && !b->flush && !b->last_buf)
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#define ngx_buf_size(b) \
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(ngx_buf_in_memory(b) ? (off_t) (b->last - b->pos): \
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(b->file_last - b->file_pos))
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ngx_buf_t *ngx_create_temp_buf(ngx_pool_t *pool, size_t size);
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ngx_chain_t *ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs);
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#define ngx_alloc_buf(pool) ngx_palloc(pool, sizeof(ngx_buf_t))
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#define ngx_calloc_buf(pool) ngx_pcalloc(pool, sizeof(ngx_buf_t))
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ngx_chain_t *ngx_alloc_chain_link(ngx_pool_t *pool);
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#define ngx_free_chain(pool, cl) \
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cl->next = pool->chain; \
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pool->chain = cl
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ngx_int_t ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in);
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ngx_int_t ngx_chain_writer(void *ctx, ngx_chain_t *in);
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ngx_int_t ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
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ngx_chain_t *in);
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ngx_chain_t *ngx_chain_get_free_buf(ngx_pool_t *p, ngx_chain_t **free);
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void ngx_chain_update_chains(ngx_pool_t *p, ngx_chain_t **free,
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ngx_chain_t **busy, ngx_chain_t **out, ngx_buf_tag_t tag);
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off_t ngx_chain_coalesce_file(ngx_chain_t **in, off_t limit);
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ngx_chain_t *ngx_chain_update_sent(ngx_chain_t *in, off_t sent);
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#endif /* _NGX_BUF_H_INCLUDED_ */
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