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


ngx_chain_t *ngx_solaris_sendfilev_chain(ngx_connection_t *c, ngx_chain_t *in)
{
    int             fd;
    char           *prev;
    off_t           fprev;
    size_t          sent;
    ssize_t         n;
    ngx_int_t       eintr;
    sendfilevec_t  *sfv;
    ngx_array_t     vec;
    ngx_event_t    *wev;
    ngx_chain_t    *cl;

    wev = c->write;

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

    do {
        fd = SFV_FD_SELF;
        prev = NULL;
        sfv = NULL;
        eintr = 0;
        sent = 0;

        /* create the sendfilevec and coalesce the neighbouring hunks */

        for (cl = in; cl; cl = cl->next) {
            if (ngx_hunk_special(cl->hunk)) {
                continue;
            }

            if (ngx_hunk_in_memory_only(cl->hunk)) {
                fd = SFV_FD_SELF;

                if (prev == cl->hunk->pos) {
                    sfv->sfv_len += cl->hunk->last - cl->hunk->pos;

                } else {
                    ngx_test_null(sfv, ngx_push_array(&vec), NGX_CHAIN_ERROR);
                    sfv->sfv_fd = SFV_FD_SELF;
                    sfv->sfv_flag = 0;
                    sfv->sfv_off = cl->hunk->pos;
                    sfv->sfv_len = cl->hunk->last - cl->hunk->pos;
                }

                prev = cl->hunk->last;

            } else {
                prev = NULL;

                if (fd == cl->hunk->file->fd && fprev == cl->hunk->file_pos) {
                    sfv->sfv_len += cl->hunk->file_last - cl->hunk->file_pos;

                } else {
                    ngx_test_null(sfv, ngx_push_array(&vec), NGX_CHAIN_ERROR);
                    fd = cl->hunk->file->fd;
                    sfv->sfv_fd = fd;
                    sfv->sfv_flag = 0;
                    sfv->sfv_off = cl->hunk->file_pos;
                    sfv->sfv_len = cl->hunk->file_last - cl->hunk->file_pos;
                }

                fprev = cl->hunk->file_last;
            }
        }

        n = sendfile(c->fd, vec->elts, vec->nelts, &sent);

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

            if (err == NGX_EINTR) {
                eintr = 1;
            }

            if (err == NGX_EAGAIN || err == NGX_EINTR) {
                ngx_log_error(NGX_LOG_INFO, c->log, err,
                              "sendfilev() sent only " SIZE_T_FMT " bytes",
                              sent);
            } else {
                wev->error = 1;
                ngx_log_error(NGX_LOG_CRIT, c->log, err, "sendfilev() failed");
                return NGX_CHAIN_ERROR;
            }
        }

#if (NGX_DEBUG_WRITE_CHAIN)
        ngx_log_debug(c->log, "sendfilev: %d " SIZE_T_FMT ", n _ sent);
#endif

        c->sent += sent;

        for (cl = in; cl; cl = cl->next) {

            if (ngx_hunk_special(cl->hunk)) {
                continue; 
            }

            if (sent == 0) {
                break;
            }

            size = ngx_hunk_size(cl->hunk);

            if (sent >= size) {
                sent -= size;

                if (cl->hunk->type & NGX_HUNK_IN_MEMORY) {
                    cl->hunk->pos = cl->hunk->last;
                }

                if (cl->hunk->type & NGX_HUNK_FILE) {
                    cl->hunk->file_pos = cl->hunk->file_last;
                }

                continue;
            }

            if (cl->hunk->type & NGX_HUNK_IN_MEMORY) {
                cl->hunk->pos += sent;
            }

            if (cl->hunk->type & NGX_HUNK_FILE) {
                cl->hunk->file_pos += sent;
            }

            break;
        }

        in = cl;

    } while (eintr);

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

    return in;
}