open function in my code doesnot work.
I already search stackoverflow and find a possible solution

if ((fd = open(*argv, 0)) < 0) {
        if(fd == -1)
        {
            switch( errno )
            {
                case EACCESS: // permission issues
                    handle_permission_issue();
                    break;

                case EEXIST: // file already exists and you used O_CREAT and O_EXCL
                    handle_already_exists_issue();
                    break;

                case EFAULT: // bad path
                    handle_bad_path_issue();
                    break;


            }
            printf("file read failedn");
        }
        printf("could not open(%s)n", *argv);
        return -1;
    }

but clion redden the code though I include the <errno.h>.
the imagine is as follows.

I want to get a solution to open filename correctly.