nginx/src/core/ngx_hunk.h

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#ifndef _NGX_HUNK_H_INCLUDED_
#define _NGX_HUNK_H_INCLUDED_
#include <ngx_config.h>
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#include <ngx_core.h>
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/* hunk type */
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/* the hunk is in memory */
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#define NGX_HUNK_IN_MEMORY 0x0001
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/* the hunk's content can be changed */
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#define NGX_HUNK_TEMP 0x0002
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/* the hunk's content is in cache and can not be changed */
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#define NGX_HUNK_MEMORY 0x0004
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/* the hunk's content is mmap()ed and can not be changed */
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#define NGX_HUNK_MMAP 0x0008
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#define NGX_HUNK_RECYCLED 0x0010
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/* the hunk is in file */
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#define NGX_HUNK_FILE 0x0100
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#define NGX_HUNK_STORAGE (NGX_HUNK_IN_MEMORY \
|NGX_HUNK_TEMP|NGX_HUNK_MEMORY|NGX_HUNK_MMAP \
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|NGX_HUNK_RECYCLED|NGX_HUNK_FILE)
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/* hunk flags */
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/* in thread state flush means to write the hunk completely before return */
/* in event state flush means to start to write the hunk */
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#define NGX_HUNK_FLUSH 0x1000
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/* last hunk */
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#define NGX_HUNK_LAST 0x2000
#define NGX_HUNK_LAST_SHADOW 0x4000
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typedef struct ngx_hunk_s ngx_hunk_t;
struct ngx_hunk_s {
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char *pos;
char *last;
off_t file_pos;
off_t file_last;
int type;
char *start; /* start of hunk */
char *end; /* end of hunk */
char *pre_start; /* start of pre-allocated hunk */
char *post_end; /* end of post-allocated hunk */
int tag;
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ngx_file_t *file;
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ngx_hunk_t *shadow;
};
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typedef struct ngx_chain_s ngx_chain_t;
struct ngx_chain_s {
ngx_hunk_t *hunk;
ngx_chain_t *next;
};
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#define NGX_CHAIN_ERROR (ngx_chain_t *) NGX_ERROR
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#define ngx_hunk_in_memory_only(h) \
((h->type & (NGX_HUNK_IN_MEMORY|NGX_HUNK_FILE)) == NGX_HUNK_IN_MEMORY)
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ngx_hunk_t *ngx_create_temp_hunk(ngx_pool_t *pool, int size,
int before, int after);
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#define ngx_alloc_hunk(pool) ngx_palloc(pool, sizeof(ngx_hunk_t))
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#define ngx_calloc_hunk(pool) ngx_pcalloc(pool, sizeof(ngx_hunk_t))
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#define ngx_alloc_chain_entry(pool) ngx_palloc(pool, sizeof(ngx_chain_t))
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#define ngx_add_hunk_to_chain(chain, h, pool, error) \
do { \
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ngx_test_null(chain, ngx_alloc_chain_entry(pool), error); \
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chain->hunk = h; \
chain->next = NULL; \
} while (0);
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#endif /* _NGX_HUNK_H_INCLUDED_ */