nginx/src/core/ngx_hunk.h

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#ifndef _NGX_CHUNK_H_INCLUDED_
#define _NGX_CHUNK_H_INCLUDED_
#include <ngx_config.h>
#include <ngx_types.h>
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#include <ngx_file.h>
#include <ngx_alloc.h>
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/* hunk type */
/* temp means that hunk's content can be changed */
/* other type means that hunk's content can not be changed */
#define NGX_HUNK_TEMP 0x0001
#define NGX_HUNK_MEMORY 0x0002
#define NGX_HUNK_MMAP 0x0004
#define NGX_HUNK_FILE 0x0008
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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 */
#define NGX_HUNK_FLUSH 0x0100
/* last hunk */
#define NGX_HUNK_LAST 0x0200
/* can be used with NGX_HUNK_LAST only */
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#define NGX_HUNK_SHUTDOWN 0x0400
#define NGX_HUNK_IN_MEMORY (NGX_HUNK_TEMP|NGX_HUNK_MEMORY|NGX_HUNK_MMAP)
typedef struct ngx_hunk_s ngx_hunk_t;
struct ngx_hunk_s {
union {
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char *mem; /* start of current data */
off_t file;
} pos;
union {
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char *mem; /* end of current data */
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_fd_t fd;
};
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_add_hunk_to_chain(chain, h, pool, error) \
do { \
ngx_test_null(chain, ngx_create_chain_entry(pool), error); \
chain->hunk = h; \
chain->next = NULL; \
} while (0);
ngx_hunk_t *ngx_get_hunk(ngx_pool_t *pool, int size, int before, int after);
#endif /* _NGX_CHUNK_H_INCLUDED_ */