nginx 0.6.27 *) Change: now by default the rtsig method is not built on Linux 2.6.18+. *) Change: now a request method is not changed while redirection to a named location via an "error_page" directive. *) Feature: the "resolver" and "resolver_timeout" directives in SMTP proxy. *) Feature: the "post_action" directive supports named locations. *) Bugfix: a segmentation fault occurred in worker process, if a request was redirected from proxy, FastCGI, or memcached location to static named locations. *) Bugfix: browsers did not repeat SSL handshake if there is no valid client certificate in first handshake. Thanks to Alexander V. Inyukhin. *) Bugfix: if response code 495-497 was redirected via an "error_page" directive without code change, then nginx tried to allocate too many memory. *) Bugfix: memory leak in long-lived non buffered connections. *) Bugfix: memory leak in resolver. *) Bugfix: a segmentation fault occurred in worker process, if a request was redirected from proxy, FastCGI, or memcached location to static named locations. *) Bugfix: in the $proxy_host and $proxy_port variables caching. Thanks to Sergey Bochenkov. *) Bugfix: a "proxy_pass" directive with variables used incorrectly the same port as in another "proxy_pass" directive with the same host name and without variables. Thanks to Sergey Bochenkov. *) Bugfix: an alert "sendmsg() failed (9: Bad file descriptor)" on some 64-bit platforms while reconfiguration. *) Bugfix: a segmentation fault occurred in worker process, if empty stub block was used second time in SSI. *) Bugfix: in copying URI part contained escaped symbols into arguments.

/*
 * Copyright (C) Igor Sysoev
 */


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


ssize_t
ngx_aio_read_chain(ngx_connection_t *c, ngx_chain_t *cl)
{
    int           n;
    u_char       *buf, *prev;
    size_t        size;
    ssize_t       total;

    if (c->read->pending_eof) {
        c->read->ready = 0;
        return 0;
    }

    total = 0;

    while (cl) {

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

        if (!c->read->ready) {
            return total ? total : NGX_AGAIN;
        }

        buf = cl->buf->last;
        prev = cl->buf->last;
        size = 0;

        /* coalesce the neighbouring bufs */

        while (cl && prev == cl->buf->last) {
            size += cl->buf->end - cl->buf->last;
            prev = cl->buf->end;
            cl = cl->next;
        }

        n = ngx_aio_read(c, buf, size);

        ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_read: %d", n);

        if (n == NGX_AGAIN) {
            return total ? total : NGX_AGAIN;
        }

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

        if (n == 0) {
            c->read->pending_eof = 1;
            if (total) {
                c->read->eof = 0;
                c->read->ready = 1;
            }
            return total;
        }

        if (n > 0) {
            total += n;
        }

        ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
                       "aio_read total: %d", total);
    }

    return total ? total : NGX_AGAIN;
}