SCTP sender

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/sctp.h>
#include <arpa/inet.h>

#define PORT 5055

int main(void)
{
    int sock;
    int retval;
    int iter;

    struct sockaddr_in bind_addr, remote_addr;
    char write_buff[1024];

    sock = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
    if (sock == -1) {
        perror("socket()");
        exit(-1);
    }

    bind_addr.sin_family = AF_INET;
    bind_addr.sin_port = htons(0);
    bind_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    if (bind_addr.sin_addr.s_addr == INADDR_NONE) {
        perror("inet_addr()");
        exit(-1);
    }

    retval = sctp_bindx(sock, (struct sockaddr *) &bind_addr, 1, SCTP_BINDX_ADD_ADDR);
    if (retval != 0) {
        perror("sctp_bindx()");
        exit(-1);
    }

    remote_addr.sin_family = AF_INET;
    remote_addr.sin_port = htons(PORT);
    remote_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    if (remote_addr.sin_addr.s_addr == INADDR_NONE) {
        perror("inet_addr()");
        exit(-1);
    }

    for(iter = 0; iter < 20; iter++) {
        snprintf(write_buff, sizeof(write_buff), "Message #%d", iter);
        retval = sctp_sendmsg(sock, (void *)write_buff, sizeof(write_buff),
                              (struct sockaddr *) &remote_addr, sizeof(remote_addr),
                              0, 0, 0, 0, 0);
        if (retval < 0) {
            perror("sctp_sendmsg()");
            exit(-1);
        }

        sleep(1);
    }

    retval = close(sock);
    if (retval != 0) {
        perror("close()");
        exit(-1);
    }

    return 0;
}