Telephonic followed by F2F. I attended only the telephonic interview. They asked data structures and puzzles telephonically.

Asked about IPC, kernel internals, interrupt handling, bottom halves, top halves, and softirqs.

1. Compilation sequence

2. fwrite() function's system call: Will it write data (present in user space) directly to the file, or does it copy data to kernel memory before writing to the file?