client

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

#define SEQ

#if defined(SEQ)
#include <sys/un.h>
#endif

int main(int argc, char *argv[])
{
    int sockfd = 0, n = 0;
    char recvBuff[1024];
    struct sockaddr_in serv_addr;

#if defined(SEQ)
    struct sockaddr_un remote;
    if ((sockfd = socket(AF_UNIX, SOCK_SEQPACKET, 0)) == -1)
    {
        perror("socket");
        exit(1);
    }

    printf("Trying to connect...\n");

    remote.sun_family = AF_UNIX;
    strcpy(remote.sun_path, argv[1]);
    int len = strlen(remote.sun_path) + sizeof(remote.sun_family);
    if (connect(sockfd, (struct sockaddr *)&remote, len) == -1)
    {
        perror("connect");
        exit(1);
    }
#else
    if(argc != 2)
    {
        printf("\n Usage: %s <ip of server> \n",argv[0]);
        return 1;
    }

    memset(recvBuff, '0',sizeof(recvBuff));
    if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
    {
        printf("\n Error : Could not create socket \n");
        return 1;
    }

    memset(&serv_addr, '0', sizeof(serv_addr));

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(5000);

    if(inet_pton(AF_INET, argv[1], &serv_addr.sin_addr)<=0)
    {
        printf("\n inet_pton error occured\n");
        return 1;
    }

    if( connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
    {
       printf("\n Error : Connect Failed \n");
       return 1;
    }
#endif

#if defined(SEQ)
    n = read(sockfd, recvBuff, sizeof(recvBuff)-1);
    recvBuff[n] = 0;
    if(fputs(recvBuff, stdout) == EOF)
    {
        printf("\n Error : Fputs error\n");
    }
#else
    while ( (n = read(sockfd, recvBuff, sizeof(recvBuff)-1)) > 0)
    {
        recvBuff[n] = 0;
        if(fputs(recvBuff, stdout) == EOF)
        {
            printf("\n Error : Fputs error\n");
        }
    }
#endif

    // write data until we block
    char buf[256];
    int dataWritten = 0;
    int retval;
    while(1)
    {
        printf("Writing...\n");
        retval = write(sockfd, buf, sizeof(buf));
        if(retval > 0)
        {
            dataWritten += retval;
            printf("dataWritten %d\n", dataWritten);
        }

        if(retval <= 0)
        {
            break;
        }
    }

    printf("dataWritten %d\n", dataWritten);

    if(n < 0)
    {
        printf("\n Read error \n");
    }

    return 0;
}