jack2/linux/avbmcl/mrp_client_control_socket.c

/*
Copyright (C) 2016-2019 Christoph Kuhr

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "mrp_client_control_socket.h"

static int control_socket = -1;

int mrp_client_get_Control_socket()
{
    return control_socket;
}

int mrp_client_init_Control_socket( FILE* filepointer )
{

    //     in POSIX fd 0,1,2 are reserved
    //    if (2 > (*avb_ctx)->mrp_ctx.control_socket)    {
    //        if (-1 > (*avb_ctx)->mrp_ctx.control_socket)
    //            close((*avb_ctx)->mrp_ctx.control_socket);
    //        return RETURN_VALUE_FAILURE;
    //    }
    struct sockaddr_in addr;
    int sockopt=0;

    fprintf(filepointer,  "Create MRP control socket.\n");fflush(filepointer);
    memset((char*)&addr, 0, sizeof(struct sockaddr_in));
    addr.sin_family = AF_INET;

    //      Listener... why 0?
    addr.sin_port = htons(0);
    //    addr.sin_port = htons(MRPD_PORT_DEFAULT);
    inet_aton("127.0.0.1", &addr.sin_addr);

    if( (control_socket = socket(addr.sin_family, SOCK_DGRAM, IPPROTO_UDP)) < 0 ){
        fprintf(filepointer,  "Failed to create socket. %d %s\n", errno, strerror(errno));fflush(filepointer);
        fclose(filepointer);
        return RETURN_VALUE_FAILURE;
    }

    // Allow the socket to be reused - incase connection is closed prematurely
    if (setsockopt(control_socket, SOL_SOCKET, SO_REUSEADDR, &sockopt, sizeof( sockopt)) == -1) {
        fprintf(filepointer,  "setsockopt failed %d %s\n", errno, strerror(errno));fflush(filepointer);
        close(control_socket);
        fclose(filepointer);
        return RETURN_VALUE_FAILURE;
    }

    if( bind(control_socket, (struct sockaddr*)&addr, sizeof(addr)) < 0)    {
        fprintf(filepointer,  "Could not bind socket. %d %s\n", errno, strerror(errno));fflush(filepointer);
        close(control_socket);
        fclose(filepointer);
        return RETURN_VALUE_FAILURE;
    } else {
        return RETURN_VALUE_SUCCESS;
    }
}