nginx 0.7.66 *) Security: now nginx/Windows ignores default file stream name. Thanks to Jose Antonio Vazquez Gonzalez. *) Change: now the charset filter runs before the SSI filter. *) Change: now no message is written in an error log if a variable is not found by $r->variable() method. *) Change: now keepalive connections after POST requests are not disabled for MSIE 7.0+. Thanks to Adam Lounds. *) Feature: the "proxy_no_cache" and "fastcgi_no_cache" directives. *) Feature: now the "rewrite" directive does a redirect automatically if the $scheme variable is used. Thanks to Piotr Sikora. *) Feature: the "chunked_transfer_encoding" directive. *) Feature: the $geoip_city_continent_code, $geoip_latitude, and $geoip_longitude variables. Thanks to Arvind Sundararajan. *) Feature: now the ngx_http_image_filter_module deletes always EXIF and other application specific data if the data consume more than 5% of a JPEG file. *) Feature: now the "msie_padding" directive works for Chrome too. *) Workaround: now keepalive connections are disabled for Safari. Thanks to Joshua Sierles. *) Bugfix: nginx ignored the "private" and "no-store" values in the "Cache-Control" backend response header line. *) Bugfix: an "&" character was not escaped when it was copied in arguments part in a rewrite rule. *) Bugfix: nginx might be terminated abnormally while a signal processing or if the directive "timer_resolution" was used on platforms which do not support kqueue or eventport notification methods. Thanks to George Xie and Maxim Dounin. *) Bugfix: if temporary files and permanent storage area resided at different file systems, then permanent file modification times were incorrect. Thanks to Maxim Dounin. *) Bugfix: ngx_http_memcached_module might issue the error message "memcached sent invalid trailer". Thanks to Maxim Dounin. *) Bugfix: nginx could not built zlib-1.2.4 library using the library sources. Thanks to Maxim Dounin. *) Bugfix: values of the $query_string, $arg_..., etc. variables cached in main request were used by the SSI module in subrequests. *) Bugfix: nginx did not support HTTPS referrers. *) Bugfix: nginx/Windows might not find file if path in configuration was given in other character case; the bug had appeared in 0.7.65. *) Bugfix: the $date_local variable has an incorrect value, if the "%s" format was used. Thanks to Maxim Dounin. *) Bugfix: nginx did not support all ciphers and digests used in client certificates. Thanks to Innocenty Enikeew. *) Bugfix: if ssl_session_cache was not set or was set to "none", then during client certificate verify the error "session id context uninitialized" might occur; the bug had appeared in 0.7.1. *) Bugfix: OpenSSL-1.0.0 compatibility on 64-bit Linux. Thanks to Maxim Dounin. *) Bugfix: a geo range returned default value if the range included two or more /16 networks and did not begin at /16 network boundary. *) Bugfix: the $uid_got variable might not be used in the SSI and perl modules. *) Bugfix: a worker process hung if a FIFO file was requested. Thanks to Vicente Aguilar and Maxim Dounin. *) Bugfix: a variable value was repeatedly encoded after each an "echo" SSI-command output; the bug had appeared in 0.6.14. *) Bugfix: a "stub" parameter of an "include" SSI directive was not used, if empty response has 200 status code. *) Bugfix: a block used in a "stub" parameter of an "include" SSI directive was output with "text/plain" MIME type. *) Bugfix: if a proxied or FastCGI request was internally redirected to another proxied or FastCGI location, then a segmentation fault might occur in a worker process; the bug had appeared in 0.7.65. Thanks to Yichun Zhang. *) Bugfix: IMAP connections may hang until they timed out while talking to Zimbra server. Thanks to Alan Batie. *) Bugfix: nginx did not support chunked transfer encoding for 201 responses. Thanks to Julian Reich.

/*
 * Copyright (C) Igor Sysoev
 */


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


ngx_chain_t *
ngx_aio_write_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
{
    u_char       *buf, *prev;
    off_t         send, sent;
    size_t        len;
    ssize_t       n, size;
    ngx_chain_t  *cl;

    /* the maximum limit size is the maximum size_t value - the page size */

    if (limit == 0 || limit > (off_t) (NGX_MAX_SIZE_T_VALUE - ngx_pagesize)) {
        limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
    }

    send = 0;
    sent = 0;
    cl = in;

    while (cl) {

        if (cl->buf->pos == cl->buf->last) {
            cl = cl->next;
            continue;
        }

        /* we can post the single aio operation only */

        if (!c->write->ready) {
            return cl;
        }

        buf = cl->buf->pos;
        prev = buf;
        len = 0;

        /* coalesce the neighbouring bufs */

        while (cl && prev == cl->buf->pos && send < limit) {
            if (ngx_buf_special(cl->buf)) {
                continue;
            }

            size = cl->buf->last - cl->buf->pos;

            if (send + size > limit) {
                size = limit - send;
            }

            len += size;
            prev = cl->buf->pos + size;
            send += size;
            cl = cl->next;
        }

        n = ngx_aio_write(c, buf, len);

        ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_write: %z", n);

        if (n == NGX_ERROR) {
            return NGX_CHAIN_ERROR;
        }

        if (n > 0) {
            sent += n;
            c->sent += n;
        }

        ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
                       "aio_write sent: %O", c->sent);

        for (cl = in; cl; cl = cl->next) {

            if (sent >= cl->buf->last - cl->buf->pos) {
                sent -= cl->buf->last - cl->buf->pos;
                cl->buf->pos = cl->buf->last;

                continue;
            }

            cl->buf->pos += sent;

            break;
        }
    }

    return cl;
}