I'm writing some code that should communicate with an Arduino through the serial line. But I'm having some troube getting my preliminary stuff working. This is what I have so far, if someone could tell me if there's something wrong with this id really appreciate it.

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <unistd.h> /* close */
#include <fcntl.h>
#include <string.h>

#include <termios.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/signal.h>
#include <sys/types.h>

int main()
{
    printf("LED read write test...v1.2\n");
    int flashNum;
    int serial;
    char sendLine[1], recvLine[256] = {0};
    serial = open("/dev/tts/1", O_RDWR | O_NOCTTY);
    if (serial == -1)
        printf("ERROR opening serial file\n");
    else
        printf("seral opened\n");
    printf("how many times would you like the led to blink (single digit)?\n");
    scanf("%c", &flashNum);
    sendLine[0] = (char)flashNum;
    //just to have it keep trying to write until it works
    while(write(serial, sendLine, 1) <= 0)
    {
        printf("writing failed....\n");
    }
    printf("writing sucess\n");
    //same as write but with read
    while(read(serial, recvLine, 1) < 0)
    {
        printf("trying to read...\n");
    }
    if (recvLine[0] == '1')
        printf("finished flashing\nclosing....\n");
    else
        printf("got unexpected data: %d", recvLine[0]);
    close(serial);
    return 0;
}