view src/os/win32/ngx_wsasend_chain.c @ 6858:f39ceadf0441

Win32: minimized redefinition of intptr_t/uintptr_t. These types are available with MSVC (at least since 2003, in stddef.h), all variants of GCC (in stdint.h) and Watcom C. We need to define them only for Borland C.
author Maxim Dounin <mdounin@mdounin.ru>
date Sat, 24 Dec 2016 18:01:14 +0300
parents 2cd019520210
children ecf2a9002b37
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


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


#define NGX_WSABUFS  8


ngx_chain_t *
ngx_wsasend_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
{
    int           rc;
    u_char       *prev;
    u_long        size, sent, send, prev_send;
    ngx_err_t     err;
    ngx_event_t  *wev;
    ngx_array_t   vec;
    ngx_chain_t  *cl;
    LPWSABUF      wsabuf;
    WSABUF        wsabufs[NGX_WSABUFS];

    wev = c->write;

    if (!wev->ready) {
        return in;
    }

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

    if (limit == 0 || limit > (off_t) (NGX_MAX_UINT32_VALUE - ngx_pagesize)) {
        limit = NGX_MAX_UINT32_VALUE - ngx_pagesize;
    }

    send = 0;

    /*
     * WSABUFs must be 4-byte aligned otherwise
     * WSASend() will return undocumented WSAEINVAL error.
     */

    vec.elts = wsabufs;
    vec.size = sizeof(WSABUF);
    vec.nalloc = NGX_WSABUFS;
    vec.pool = c->pool;

    for ( ;; ) {
        prev = NULL;
        wsabuf = NULL;
        prev_send = send;

        vec.nelts = 0;

        /* create the WSABUF and coalesce the neighbouring bufs */

        for (cl = in;
             cl && vec.nelts < ngx_max_wsabufs && send < limit;
             cl = cl->next)
        {
            if (ngx_buf_special(cl->buf)) {
                continue;
            }

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

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

            if (prev == cl->buf->pos) {
                wsabuf->len += cl->buf->last - cl->buf->pos;

            } else {
                wsabuf = ngx_array_push(&vec);
                if (wsabuf == NULL) {
                    return NGX_CHAIN_ERROR;
                }

                wsabuf->buf = (char *) cl->buf->pos;
                wsabuf->len = cl->buf->last - cl->buf->pos;
            }

            prev = cl->buf->last;
            send += size;
        }

        sent = 0;

        rc = WSASend(c->fd, vec.elts, vec.nelts, &sent, 0, NULL, NULL);

        if (rc == -1) {
            err = ngx_errno;

            if (err == WSAEWOULDBLOCK) {
                ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
                               "WSASend() not ready");

            } else {
                wev->error = 1;
                ngx_connection_error(c, err, "WSASend() failed");
                return NGX_CHAIN_ERROR;
            }
        }

        ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
                       "WSASend: fd:%d, s:%ul", c->fd, sent);

        c->sent += sent;

        in = ngx_chain_update_sent(in, sent);

        if (send - prev_send != sent) {
            wev->ready = 0;
            return in;
        }

        if (send >= limit || in == NULL) {
            return in;
        }
    }
}


ngx_chain_t *
ngx_overlapped_wsasend_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
{
    int               rc;
    u_char           *prev;
    u_long            size, send, sent;
    ngx_err_t         err;
    ngx_event_t      *wev;
    ngx_array_t       vec;
    ngx_chain_t      *cl;
    LPWSAOVERLAPPED   ovlp;
    LPWSABUF          wsabuf;
    WSABUF            wsabufs[NGX_WSABUFS];

    wev = c->write;

    if (!wev->ready) {
        return in;
    }

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

    if (!wev->complete) {

        /* post the overlapped WSASend() */

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

        if (limit == 0 || limit > (off_t) (NGX_MAX_UINT32_VALUE - ngx_pagesize))
        {
            limit = NGX_MAX_UINT32_VALUE - ngx_pagesize;
        }

        /*
         * WSABUFs must be 4-byte aligned otherwise
         * WSASend() will return undocumented WSAEINVAL error.
         */

        vec.elts = wsabufs;
        vec.nelts = 0;
        vec.size = sizeof(WSABUF);
        vec.nalloc = NGX_WSABUFS;
        vec.pool = c->pool;

        send = 0;
        prev = NULL;
        wsabuf = NULL;

        /* create the WSABUF and coalesce the neighbouring bufs */

        for (cl = in;
             cl && vec.nelts < ngx_max_wsabufs && send < limit;
             cl = cl->next)
        {
            if (ngx_buf_special(cl->buf)) {
                continue;
            }

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

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

            if (prev == cl->buf->pos) {
                wsabuf->len += cl->buf->last - cl->buf->pos;

            } else {
                wsabuf = ngx_array_push(&vec);
                if (wsabuf == NULL) {
                    return NGX_CHAIN_ERROR;
                }

                wsabuf->buf = (char *) cl->buf->pos;
                wsabuf->len = cl->buf->last - cl->buf->pos;
            }

            prev = cl->buf->last;
            send += size;
        }

        ovlp = (LPWSAOVERLAPPED) &c->write->ovlp;
        ngx_memzero(ovlp, sizeof(WSAOVERLAPPED));

        rc = WSASend(c->fd, vec.elts, vec.nelts, &sent, 0, ovlp, NULL);

        wev->complete = 0;

        if (rc == -1) {
            err = ngx_errno;

            if (err == WSA_IO_PENDING) {
                ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
                               "WSASend() posted");
                wev->active = 1;
                return in;

            } else {
                wev->error = 1;
                ngx_connection_error(c, err, "WSASend() failed");
                return NGX_CHAIN_ERROR;
            }

        } else if (ngx_event_flags & NGX_USE_IOCP_EVENT) {

            /*
             * if a socket was bound with I/O completion port then
             * GetQueuedCompletionStatus() would anyway return its status
             * despite that WSASend() was already complete
             */

            wev->active = 1;
            return in;
        }

        ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
                       "WSASend: fd:%d, s:%ul", c->fd, sent);

    } else {

        /* the overlapped WSASend() complete */

        wev->complete = 0;
        wev->active = 0;

        if (ngx_event_flags & NGX_USE_IOCP_EVENT) {
            if (wev->ovlp.error) {
                ngx_connection_error(c, wev->ovlp.error, "WSASend() failed");
                return NGX_CHAIN_ERROR;
            }

            sent = wev->available;

        } else {
            if (WSAGetOverlappedResult(c->fd, (LPWSAOVERLAPPED) &wev->ovlp,
                                       &sent, 0, NULL)
                == 0)
            {
                ngx_connection_error(c, ngx_socket_errno,
                               "WSASend() or WSAGetOverlappedResult() failed");

                return NGX_CHAIN_ERROR;
            }
        }
    }

    ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
                   "WSASend ovlp: fd:%d, s:%ul", c->fd, sent);

    c->sent += sent;

    in = ngx_chain_update_sent(in, sent);

    if (in) {
        wev->ready = 0;

    } else {
        wev->ready = 1;
    }

    return in;
}