/*

 * Copyright (C) Igor Sysoev

 * Copyright (C) Nginx, Inc.

 */

#include <ngx_config.h>

#include <ngx_core.h>

#include <ngx_event.h>

ssize_t

ngx_unix_send(ngx_connection_t *c, u_char *buf, size_t size)

{

    ssize_t       n;

    ngx_err_t     err;

    ngx_event_t  *wev;

    wev = c->write;

#if (NGX_HAVE_KQUEUE)

    if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {

        (void) ngx_connection_error(c, wev->kq_errno,

                               "kevent() reported about an closed connection");

        wev->error = 1;

        return NGX_ERROR;

    }

#endif

    for ( ;; ) {

        n = send(c->fd, buf, size, 0);

        ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,

                       "send: fd:%d %z of %uz", c->fd, n, size);

        if (n > 0) {

            if (n < (ssize_t) size) {

                wev->ready = 0;

            }

            c->sent += n;

            return n;

        }

        err = ngx_socket_errno;

        if (n == 0) {

            ngx_log_error(NGX_LOG_ALERT, c->log, err, "send() returned zero");

            wev->ready = 0;

            return n;

        }

        if (err == NGX_EAGAIN || err == NGX_EINTR) {

            wev->ready = 0;

            ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,

                           "send() not ready");

            if (err == NGX_EAGAIN) {

                return NGX_AGAIN;

            }

        } else {

            wev->error = 1;

            (void) ngx_connection_error(c, err, "send() failed");

            return NGX_ERROR;

        }

    }

}