connection socket pool

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define xconnect(fd, addr, len) \
        do { \
                if (connect(fd, addr, len) < 0) { \
                        fprintf(stderr, "connect error with: %s\n", \
                                strerror(errno)); \
                        exit(EXIT_FAILURE); \
                } \
        } while (0)

int main(int argc, char *argv[])
{
        int retval;
        struct sockaddr_in addr;
        socklen_t len;

        retval = socket(AF_INET, SOCK_STREAM, 0);
        memset(&addr, 0, sizeof(&addr));
        addr.sin_family = AF_INET;
        addr.sin_addr.s_addr = inet_addr("192.168.235.10");
        addr.sin_port = htons(22);
        len = sizeof(addr);
        xconnect(retval, (struct sockaddr*)&addr, len);
        getsockname(retval, (struct sockaddr*)&addr, &len);
        printf("%d\n", ntohs(addr.sin_port));
        addr.sin_family = AF_UNSPEC;
        xconnect(retval, (struct sockaddr*)&addr, len);
        addr.sin_family = AF_INET;
        addr.sin_port = htons(22);
        xconnect(retval, (struct sockaddr*)&addr, len);
        getsockname(retval, (struct sockaddr*)&addr, &len);
        printf("%d\n", ntohs(addr.sin_port));

        return 0;
}