Bind to specific address on FreeBSD

[Chris Given]

I can't figure out why this code won't bind to 127.0.0.1 on FreeBSD. I get
an error "Can't assign requested address".

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

int main() {
        int sock;
        struct sockaddr_in dp;
        unsigned long bind_to_addr = inet_addr("127.0.0.1");

        sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
        if(sock < 0) {
                printf("Error socket : %s\n", strerror(errno));
                return -1;
        }

        dp.sin_family = AF_INET;
        dp.sin_addr.s_addr = htonl(bind_to_addr);
        dp.sin_port = htons(1234);

        if(bind(sock, (struct sockaddr*)&dp, sizeof(struct sockaddr_in))!=0)
{
                printf("Bind failed : %s\n", strerror(errno));
        } else {
                printf("Bind success\n");
        }
}

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