nginx 0.7.63 *) Security: now "/../" are disabled in "Destination" request header line. *) Change: minimum supported OpenSSL version is 0.9.7. *) Change: the "ask" parameter of the "ssl_verify_client" directive was changed to the "optional" parameter and now it checks a client certificate if it was offered. Thanks to Brice Figureau. *) Feature: now the "-V" switch shows TLS SNI support. *) Feature: the $ssl_client_verify variable. Thanks to Brice Figureau. *) Feature: the "ssl_crl" directive. Thanks to Brice Figureau. *) Bugfix: the $ssl_client_cert variable usage corrupted memory; the bug had appeared in 0.7.7. Thanks to Sergey Zhuravlev. *) Feature: now the start cache loader runs in a separate process; this should improve large caches handling. *) Feature: now temporary files and permanent storage area may reside at different file systems. *) Bugfix: nginx counted incorrectly disk cache size. *) Change: now directive "gzip_disable msie6" does not disable gzipping for MSIE 6.0 SV1. *) Bugfix: nginx always added "Vary: Accept-Encoding" response header line, if both "gzip_static" and "gzip_vary" were on. *) Feature: the "proxy" parameter of the "geo" directive. *) Feature: the ngx_http_geoip_module. *) Feature: the "limit_rate_after" directive. Thanks to Ivan Debnar. *) Feature: the "limit_req_log_level" and "limit_conn_log_level" directives. *) Bugfix: now "limit_req" directive conforms to the leaky bucket algorithm. Thanks to Maxim Dounin. *) Bugfix: in ngx_http_limit_req_module. Thanks to Maxim Dounin. *) Bugfix: now nginx allows underscores in a request method. *) Bugfix: "proxy_pass_header" and "fastcgi_pass_header" directives did not pass to a client the "X-Accel-Redirect", "X-Accel-Limit-Rate", "X-Accel-Buffering", and "X-Accel-Charset" lines from backend response header. Thanks to Maxim Dounin. *) Bugfix: in handling "Last-Modified" and "Accept-Ranges" backend response header lines; the bug had appeared in 0.7.44. Thanks to Maxim Dounin. *) Feature: the "image_filter_transparency" directive. *) Feature: the "image_filter" directive supports variables for setting size. *) Bugfix: in PNG alpha-channel support in the ngx_http_image_filter_module. *) Bugfix: in transparency support in the ngx_http_image_filter_module. *) Feature: now several "perl_modules" directives may be used. *) Bugfix: ngx_http_perl_module responses did not work in subrequests. *) Bugfix: nginx sent '\0' in a "Location" response header line on MKCOL request. Thanks to Xie Zhenye. *) Bugfix: an "error_page" directive did not redirect a 413 error; the bug had appeared in 0.6.10. *) Bugfix: in memory allocation error handling. Thanks to Maxim Dounin and Kirill A. Korinskiy.

/*
 * 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;
}