nginx 0.1.29 *) Feature: the ngx_http_ssi_module supports "include virtual" command. *) Feature: the ngx_http_ssi_module supports the condition command like 'if expr="$NAME"' and "else" and "endif" commands. Only one nested level is supported. *) Feature: the ngx_http_ssi_module supports the DATE_LOCAL and DATE_GMT variables and "config timefmt" command. *) Feature: the "ssi_ignore_recycled_buffers" directive. *) Bugfix: the "echo" command did not show the default value for the empty QUERY_STRING variable. *) Change: the ngx_http_proxy_module was rewritten. *) Feature: the "proxy_redirect", "proxy_pass_request_headers", "proxy_pass_request_body", and "proxy_method" directives. *) Feature: the "proxy_set_header" directive. The "proxy_x_var" was canceled and must be replaced with the proxy_set_header directive. *) Change: the "proxy_preserve_host" is canceled and must be replaced with the "proxy_set_header Host $host" and the "proxy_redirect off" directives, the "proxy_set_header Host $host:$proxy_port" directive and the appropriate proxy_redirect directives. *) Change: the "proxy_set_x_real_ip" is canceled and must be replaced with the "proxy_set_header X-Real-IP $remote_addr" directive. *) Change: the "proxy_add_x_forwarded_for" is canceled and must be replaced with the "proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for" directive. *) Change: the "proxy_set_x_url" is canceled and must be replaced with the "proxy_set_header X-URL http://$host:$server_port$request_uri" directive. *) Feature: the "fastcgi_param" directive. *) Change: the "fastcgi_root", "fastcgi_set_var" and "fastcgi_params" directive are canceled and must be replaced with the fastcgi_param directives. *) Feature: the "index" directive can use the variables. *) Feature: the "index" directive can be used at http and server levels. *) Change: the last index only in the "index" directive can be absolute. *) Feature: the "rewrite" directive can use the variables. *) Feature: the "internal" directive. *) Feature: the CONTENT_LENGTH, CONTENT_TYPE, REMOTE_PORT, SERVER_ADDR, SERVER_PORT, SERVER_PROTOCOL, DOCUMENT_ROOT, SERVER_NAME, REQUEST_METHOD, REQUEST_URI, and REMOTE_USER variables. *) Change: nginx now passes the invalid lines in a client request headers or a backend response header. *) Bugfix: if the backend did not transfer response for a long time and the "send_timeout" was less than "proxy_read_timeout", then nginx returned the 408 response. *) Bugfix: the segmentation fault was occurred if the backend sent an invalid line in response header; bug appeared in 0.1.26. *) Bugfix: the segmentation fault may occurred in FastCGI fault tolerance configuration. *) Bugfix: the "expires" directive did not remove the previous "Expires" and "Cache-Control" headers. *) Bugfix: nginx did not take into account trailing dot in "Host" header line. *) Bugfix: the ngx_http_auth_module did not work under Linux. *) Bugfix: the rewrite directive worked incorrectly, if the arguments were in a request. *) Bugfix: nginx could not be built on MacOS X.

/*
 * Copyright (C) Igor Sysoev
 */


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

#if (NGX_HAVE_KQUEUE)
#include <ngx_kqueue_module.h>
#endif


/*
 * the ready data requires 3 syscalls:
 *     aio_write(), aio_error(), aio_return()
 * the non-ready data requires 4 (kqueue) or 5 syscalls:
 *     aio_write(), aio_error(), notifiction, aio_error(), aio_return()
 *                               timeout, aio_cancel(), aio_error()
 */

ssize_t ngx_aio_read(ngx_connection_t *c, u_char *buf, size_t size)
{
    int           n;
    ngx_event_t  *rev;

    rev = c->read;

    if (!rev->ready) {
        ngx_log_error(NGX_LOG_ALERT, c->log, 0, "second aio post");
        return NGX_AGAIN;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
                   "rev->complete: %d", rev->complete);
    ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
                   "aio size: %d", size);

    if (!rev->complete) {
        ngx_memzero(&rev->aiocb, sizeof(struct aiocb));

        rev->aiocb.aio_fildes = c->fd;
        rev->aiocb.aio_buf = buf;
        rev->aiocb.aio_nbytes = size;

#if (NGX_HAVE_KQUEUE)
        rev->aiocb.aio_sigevent.sigev_notify_kqueue = ngx_kqueue;
        rev->aiocb.aio_sigevent.sigev_notify = SIGEV_KEVENT;
        rev->aiocb.aio_sigevent.sigev_value.sigval_ptr = rev;
#endif

        if (aio_read(&rev->aiocb) == -1) {
            ngx_log_error(NGX_LOG_CRIT, rev->log, ngx_errno,
                          "aio_read() failed");
            rev->error = 1;
            return NGX_ERROR;
        }

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

        rev->active = 1;
        rev->ready = 0;
    }

    rev->complete = 0;

    n = aio_error(&rev->aiocb);
    if (n == -1) {
        ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno, "aio_error() failed");
        rev->error = 1;
        return NGX_ERROR;
    }

    if (n != 0) {
        if (n == NGX_EINPROGRESS) {
            if (rev->ready) {
                ngx_log_error(NGX_LOG_ALERT, c->log, n,
                              "aio_read() still in progress");
                rev->ready = 0;
            }
            return NGX_AGAIN;
        }

        ngx_log_error(NGX_LOG_CRIT, c->log, n, "aio_read() failed");
        rev->error = 1;
        rev->ready = 0;
        return NGX_ERROR;
    }

    n = aio_return(&rev->aiocb);
    if (n == -1) {
        ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
                      "aio_return() failed");

        rev->error = 1;
        rev->ready = 0;
        return NGX_ERROR;
    }

    ngx_log_debug2(NGX_LOG_DEBUG_EVENT, rev->log, 0,
                   "aio_read: #%d %d", c->fd, n);

    if (n == 0) {
        rev->eof = 1;
        rev->ready = 0;
    } else {
        rev->ready = 1;
    }

    rev->active = 0;

    return n;
}