Question

I have character device /dev/nvram and through program I want to check it.
One guy asked to check the st_mode field of the struct stat structure aganist S_ISCHR macro. But I didnt understood this information. Can some one help with some sample programs.

Answer 1

How about this:

#include <stdio.h>
#include <sys/stat.h>

int main()
{
    struct stat st;

    if (stat("/dev/nvram", &st) != -1)
    {
        if (S_ISCHR(st.st_mode))
        {
            printf("is char device\n");
        }
    }

    return 0;
}