조각 코드 : /dev/random을 이용한 Random 생성함수

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int random_get(void *buf, size_t size)
 
 
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int main()
{
    int n;
    unsigned long int value;
    n = random_get((void *)&value, 4);
    printf("%d %lu\n", n, value);
}
 
 
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int random_get(void *buf, size_t size)
{
    int fd;
    int n = 0;
    fd = open("/dev/random", O_RDONLY);
    while( n < size)
    {
        n += read(fd, buf, size - n);
    }
    close(fd);
    return n;
}
 
 
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