#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

void filecopy(int fd1,int fd2);

int main(int argc, char *argv[])
{
    int fd1,fd2;

    if (3 != argc)
        return -1;

    if ((fd1 = open(argv+1,O_RDONLY,0)) == -1)
        return -2;
    if ((fd2 = open(argv+2,O_RDONLY,0)) == -1)
        return -2;

    filecopy(fd1,fd2);
}

void filecopy(int fd1,int fd2)
{
    int n;
    char *str[100];

    while ((n = read(fd1,str,100)) !=-1 && n != 0 )
        write(1,str,n);

    while ((n = read(fd2,str,100)) != -1 && n != 0)
        write(1,str,n);
}