Reading camera input from /dev/video0 in python or c

I want to read from the file /dev/video0 either through c or python,and store the incoming bytes in a different file. Here is my c code:

#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
int main()
{
    int fd,wfd;
    fd=open("/dev/video0",O_RDONLY);
    wfd=open("image",O_RDWR|O_CREAT|O_APPEND,S_IRWXU);
    if(fd==-1)
        perror("open");
    while(1)
    {
        char buffer[50];
        int rd;
        rd=read(fd,buffer,50);
        write(wfd,buffer,rd);
    }

    return 0;
}

When i run this code and after some time terminate the program nothing happens except a file name "image" is generated which is usual.

This is my python code:

    image=open("/dev/video0","rb")
    image.read()

and this is my error when my run this snippet:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: [Errno 22] Invalid argument

I want to know how to do this using pure c or python code.Please no external library suggestions.