diff options
Diffstat (limited to 'app/nginx/src/core/ngx_buf.h')
| -rw-r--r-- | app/nginx/src/core/ngx_buf.h | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/app/nginx/src/core/ngx_buf.h b/app/nginx/src/core/ngx_buf.h new file mode 100644 index 0000000..12781a7 --- /dev/null +++ b/app/nginx/src/core/ngx_buf.h @@ -0,0 +1,170 @@ + +/* + * Copyright (C) Igor Sysoev + * Copyright (C) Nginx, Inc. + */ + + +#ifndef _NGX_BUF_H_INCLUDED_ +#define _NGX_BUF_H_INCLUDED_ + + +#include <ngx_config.h> +#include <ngx_core.h> + + +typedef void * ngx_buf_tag_t; + +typedef struct ngx_buf_s ngx_buf_t; + +struct ngx_buf_s { + u_char *pos; + u_char *last; + off_t file_pos; + off_t file_last; + + u_char *start; /* start of buffer */ + u_char *end; /* end of buffer */ + ngx_buf_tag_t tag; + ngx_file_t *file; + ngx_buf_t *shadow; + + + /* the buf's content could be changed */ + unsigned temporary:1; + + /* + * the buf's content is in a memory cache or in a read only memory + * and must not be changed + */ + unsigned memory:1; + + /* the buf's content is mmap()ed and must not be changed */ + unsigned mmap:1; + + unsigned recycled:1; + unsigned in_file:1; + unsigned flush:1; + unsigned sync:1; + unsigned last_buf:1; + unsigned last_in_chain:1; + + unsigned last_shadow:1; + unsigned temp_file:1; + + /* STUB */ int num; +}; + + +struct ngx_chain_s { + ngx_buf_t *buf; + ngx_chain_t *next; +}; + + +typedef struct { + ngx_int_t num; + size_t size; +} ngx_bufs_t; + + +typedef struct ngx_output_chain_ctx_s ngx_output_chain_ctx_t; + +typedef ngx_int_t (*ngx_output_chain_filter_pt)(void *ctx, ngx_chain_t *in); + +typedef void (*ngx_output_chain_aio_pt)(ngx_output_chain_ctx_t *ctx, + ngx_file_t *file); + +struct ngx_output_chain_ctx_s { + ngx_buf_t *buf; + ngx_chain_t *in; + ngx_chain_t *free; + ngx_chain_t *busy; + + unsigned sendfile:1; + unsigned directio:1; + unsigned unaligned:1; + unsigned need_in_memory:1; + unsigned need_in_temp:1; + unsigned aio:1; + +#if (NGX_HAVE_FILE_AIO || NGX_COMPAT) + ngx_output_chain_aio_pt aio_handler; +#if (NGX_HAVE_AIO_SENDFILE || NGX_COMPAT) + ssize_t (*aio_preload)(ngx_buf_t *file); +#endif +#endif + +#if (NGX_THREADS || NGX_COMPAT) + ngx_int_t (*thread_handler)(ngx_thread_task_t *task, + ngx_file_t *file); + ngx_thread_task_t *thread_task; +#endif + + off_t alignment; + + ngx_pool_t *pool; + ngx_int_t allocated; + ngx_bufs_t bufs; + ngx_buf_tag_t tag; + + ngx_output_chain_filter_pt output_filter; + void *filter_ctx; +}; + + +typedef struct { + ngx_chain_t *out; + ngx_chain_t **last; + ngx_connection_t *connection; + ngx_pool_t *pool; + off_t limit; +} ngx_chain_writer_ctx_t; + + +#define NGX_CHAIN_ERROR (ngx_chain_t *) NGX_ERROR + + +#define ngx_buf_in_memory(b) (b->temporary || b->memory || b->mmap) +#define ngx_buf_in_memory_only(b) (ngx_buf_in_memory(b) && !b->in_file) + +#define ngx_buf_special(b) \ + ((b->flush || b->last_buf || b->sync) \ + && !ngx_buf_in_memory(b) && !b->in_file) + +#define ngx_buf_sync_only(b) \ + (b->sync \ + && !ngx_buf_in_memory(b) && !b->in_file && !b->flush && !b->last_buf) + +#define ngx_buf_size(b) \ + (ngx_buf_in_memory(b) ? (off_t) (b->last - b->pos): \ + (b->file_last - b->file_pos)) + +ngx_buf_t *ngx_create_temp_buf(ngx_pool_t *pool, size_t size); +ngx_chain_t *ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs); + + +#define ngx_alloc_buf(pool) ngx_palloc(pool, sizeof(ngx_buf_t)) +#define ngx_calloc_buf(pool) ngx_pcalloc(pool, sizeof(ngx_buf_t)) + +ngx_chain_t *ngx_alloc_chain_link(ngx_pool_t *pool); +#define ngx_free_chain(pool, cl) \ + cl->next = pool->chain; \ + pool->chain = cl + + + +ngx_int_t ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in); +ngx_int_t ngx_chain_writer(void *ctx, ngx_chain_t *in); + +ngx_int_t ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, + ngx_chain_t *in); +ngx_chain_t *ngx_chain_get_free_buf(ngx_pool_t *p, ngx_chain_t **free); +void ngx_chain_update_chains(ngx_pool_t *p, ngx_chain_t **free, + ngx_chain_t **busy, ngx_chain_t **out, ngx_buf_tag_t tag); + +off_t ngx_chain_coalesce_file(ngx_chain_t **in, off_t limit); + +ngx_chain_t *ngx_chain_update_sent(ngx_chain_t *in, off_t sent); + +#endif /* _NGX_BUF_H_INCLUDED_ */ |