Method write

src/socket.cpp:2188–2256

Write data to a socket. */

/* Write data to a socket. */
int SIPpSocket::write(const char *buffer, ssize_t len, int flags, struct sockaddr_storage *dest)
{
    int rc;

    if (ss_out) {
        rc = flush();
        TRACE_MSG("Attempted socket flush returned %d\r\n", rc);
        if (rc < 0) {
            if ((errno == EWOULDBLOCK) && (flags & WS_BUFFER)) {
                buffer_write(buffer, len, dest);
                return len;
            } else {
                return rc;
            }
        }
    }

    rc = write_primitive(buffer, len, dest);
    struct timeval currentTime;
    GET_TIME (&currentTime);

    if (rc == len) {
        /* Everything is great. */
        if (useMessagef == 1) {
            TRACE_MSG("----------------------------------------------- %s\n"
                      "%s %smessage sent [%zu] bytes:\n\n%.*s\n",
                      CStat::formatTime(&currentTime, true),
                      TRANSPORT_TO_STRING(ss_transport),
                      ss_control ? "control " : "",
                      len, (int)len, buffer);
        }

        if (useShortMessagef == 1) {
            char *msg = strdup(buffer);
            const char *call_id = get_trimmed_call_id(msg);
            TRACE_SHORTMSG("%s\tS\t%s\tCSeq:%s\t%s\n",
                           CStat::formatTime(&currentTime, rfc3339), call_id, get_header_content(msg, "CSeq:"), get_first_line(msg));
            free(msg);
        }

    } else if (rc <= 0) {
        if ((errno == EWOULDBLOCK) && (flags & WS_BUFFER)) {
            buffer_write(buffer, len, dest);
            enter_congestion(errno);
            return len;
        }
        if (useMessagef == 1) {
            TRACE_MSG("----------------------------------------------- %s\n"
                      "Error sending %s message:\n\n%.*s\n",
                      CStat::formatTime(&currentTime, true),
                      TRANSPORT_TO_STRING(ss_transport),
                      (int)len, buffer);
        }
        return write_error(errno);
    } else {
        /* We have a truncated message, which must be handled internally to the write function. */
        if (useMessagef == 1) {
            TRACE_MSG("----------------------------------------------- %s\n"