Function cgi_bucket_read

modules/generators/cgi_common.h:348–405

Read method of CGI bucket: polls on stderr and stdout of the child, * sending any stderr output immediately away to the error log. */

/* Read method of CGI bucket: polls on stderr and stdout of the child,
 * sending any stderr output immediately away to the error log. */
static apr_status_t cgi_bucket_read(apr_bucket *b, const char **str,
                                    apr_size_t *len, apr_read_type_e block)
{
    struct cgi_bucket_data *data = b->data;
    apr_interval_time_t timeout = 0;
    apr_status_t rv;
    int gotdata = 0;

    if (block != APR_NONBLOCK_READ) {
        timeout = data->timeout > 0 ? data->timeout : data->r->server->timeout;
    }

    do {
        const apr_pollfd_t *results;
        apr_int32_t num;

        rv = apr_pollset_poll(data->pollset, timeout, &num, &results);
        if (APR_STATUS_IS_TIMEUP(rv)) {
            if (timeout) {
                ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, data->r, APLOGNO(01220)
                              "Timeout waiting for output from CGI script %s",
                              data->r->filename);
                return rv;
            }
            else {
                return APR_EAGAIN;
            }
        }
        else if (APR_STATUS_IS_EINTR(rv)) {
            continue;
        }
        else if (rv != APR_SUCCESS) {
            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, data->r, APLOGNO(01221)
                          "poll failed waiting for CGI child");
            return rv;
        }

        for (; num; num--, results++) {
            if (results[0].client_data == (void *)1) {
                /* stdout */
                rv = cgi_read_stdout(b, results[0].desc.f, str, len);
                if (APR_STATUS_IS_EOF(rv)) {
                    rv = APR_SUCCESS;
                }
                gotdata = 1;
            } else {
                /* stderr */
                apr_status_t rv2 = log_script_err(data->r, results[0].desc.f);
                if (APR_STATUS_IS_EOF(rv2)) {
                    apr_pollset_remove(data->pollset, &results[0]);
                }
            }
        }

    } while (!gotdata);

    return rv;
}