Modbus

Setting socket option so that TCP Modbus slave can re-use same port immediately after freeing it

2019-02-11, Edouard Tisserant
1223f413e054
Parents 19bf8e678c42
Children 99009b24d4019334c8280602
Setting socket option so that TCP Modbus slave can re-use same port immediately after freeing it
1 files changed, 4 insertions(+), 0 deletions(-)
  • +4 -0
    sin_util.c
    • --- a/sin_util.c Fri Nov 16 09:28:12 2018 +0100
    +++ b/sin_util.c Mon Feb 11 11:07:01 2019 +0100
    @@ -153,6 +153,10 @@
    if ((type = gettypebyname(protocol)) == SOCK_PACKET) return -1;
    /* create the socket */
    if ((s = socket(PF_INET, type, 0)) < 0) {perror("socket()"); return -1;}
    + if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof(int)) < 0) {
    + perror("setsockopt(SO_REUSEADDR) failed");
    + return -1;
    + }
    /* bind the socket */
    if (bind(s, (struct sockaddr *)&sin, sizeof (sin)) < 0) {perror("bind()"); return -1;}