nginx 0.7.65 *) Security: now nginx/Windows ignores trailing spaces in URI. Thanks to Dan Crowley, Core Security Technologies. *) Security: now nginx/Windows ignores short files names. Thanks to Dan Crowley, Core Security Technologies. *) Change: now the "009" status code is written to an access log for proxied HTTP/0.9 responses. *) Change: now the default buffer size of the "large_client_header_buffers" directive is 8K. Thanks to Andrew Cholakian. *) Change: now default SSL ciphers are "HIGH:!ADH:!MD5". *) Change: now SSLv2 protocol is disabled by default. *) Change: now $host variable value is always low case. *) Feature: the conf/fastcgi.conf for simple FastCGI configurations. *) Feature: now URI part is not required a "proxy_pass" directive if variables are used. *) Feature: the $ssl_session_id variable. *) Bugfix: if a proxied or FastCGI request was internally redirected to another proxied or FastCGI location, then $upstream_response_time variable may have abnormally large value; the bug had appeared in 0.7.63. *) Bugfix: if the "expires modified" set date in the past, then a negative number was set in the "Cache-Control" response header line. Thanks to Alex Kapranoff. *) Bugfix: nginx closed a connection if a cached response had an empty body. Thanks to Piotr Sikora. *) Bugfix: nginx cached a 304 response if there was the "If-None-Match" header line in a proxied request. Thanks to Tim Dettrick and David Kostal. *) Bugfix: nginx did not treat a comma as separator in the "Cache-Control" backend response header line. *) Bugfix: cached HTTP/0.9 responses were handled incorrectly. *) Bugfix: nginx sent gzipped responses to clients those do not support gzip, if "gzip_static on" and "gzip_vary off"; the bug had appeared in 0.8.16. *) Bugfix: nginx always added "Content-Encoding: gzip" response header line in 304 responses sent by ngx_http_gzip_static_module. *) Bugfix: the "!-x" operator did not work. Thanks to Maxim Dounin. *) Bugfix: a segmentation fault might occur in a worker process, if limit_rate was used in HTTPS server. Thanks to Maxim Dounin. *) Bugfix: a segmentation fault might occur in a worker process while $limit_rate logging. Thanks to Maxim Dounin. *) Bugfix: nginx did not support dates in 2038 year on 32-bit platforms; *) Bugfix: nginx/Windows tried to delete a temporary file twice if the file should replace an already existent file. *) Bugfix: nginx/Windows tried to rename a temporary file twice if the file should replace an already existent file. *) Bugfix: nginx/Windows might not create temporary file, a cache file, or "proxy/fastcgi_store"d file if a worker had no enough access rights for top level directories. *) Bugfix: in UTF-8 encoding support by "try_files" directive in nginx/Windows. *) Bugfix: UTF-8 encoding usage in the ngx_http_autoindex_module. Thanks to Maxim Dounin. *) Bugfix: the ngx_http_autoindex_module did not show the trailing slash in links to a directory; the bug had appeared in 0.7.15. *) Bugfix: nginx did not close a log file set by the --error-log-path configuration option; the bug had appeared in 0.7.53. *) Bugfix: "addition_types" directive was incorrectly named "addtion_types". *) Bugfix: invalid request line in $request variable was written in access_log only if error_log was set to "info" or "debug" level.

/*
 * 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;
}