nginx/src/core/ngx_output_chain.c

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>


#if 0
#define NGX_SENDFILE_LIMIT …
#endif

/*
 * When DIRECTIO is enabled FreeBSD, Solaris, and MacOSX read directly
 * to an application memory from a device if parameters are aligned
 * to device sector boundary (512 bytes).  They fallback to usual read
 * operation if the parameters are not aligned.
 * Linux allows DIRECTIO only if the parameters are aligned to a filesystem
 * sector boundary, otherwise it returns EINVAL.  The sector size is
 * usually 512 bytes, however, on XFS it may be 4096 bytes.
 */

#define NGX_NONE …


static ngx_inline ngx_int_t
    ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf);
static ngx_int_t ngx_output_chain_add_copy(ngx_pool_t *pool,
    ngx_chain_t **chain, ngx_chain_t *in);
static ngx_int_t ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx,
    off_t bsize);
static ngx_int_t ngx_output_chain_get_buf(ngx_output_chain_ctx_t *ctx,
    off_t bsize);
static ngx_int_t ngx_output_chain_copy_buf(ngx_output_chain_ctx_t *ctx);


ngx_int_t
ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
{ … }


static ngx_inline ngx_int_t
ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
{ … }


static ngx_int_t
ngx_output_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
    ngx_chain_t *in)
{ … }


static ngx_int_t
ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx, off_t bsize)
{ … }


static ngx_int_t
ngx_output_chain_get_buf(ngx_output_chain_ctx_t *ctx, off_t bsize)
{ … }


static ngx_int_t
ngx_output_chain_copy_buf(ngx_output_chain_ctx_t *ctx)
{ … }


ngx_int_t
ngx_chain_writer(void *data, ngx_chain_t *in)
{ … }