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Diffstat (limited to 'security/advanced/frm_process_thread.tex')
| -rw-r--r-- | security/advanced/frm_process_thread.tex | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/security/advanced/frm_process_thread.tex b/security/advanced/frm_process_thread.tex index 1c2123a..67954e0 100644 --- a/security/advanced/frm_process_thread.tex +++ b/security/advanced/frm_process_thread.tex @@ -198,30 +198,40 @@ char *envp[] = { \begin{itemize} \item Requirements \begin{itemize} + \begin{scriptsize} \item communicate between Processes (e.g. Child to Parent) \item private communication channel + \end{scriptsize} \end{itemize} \item Solution Statement \begin{enumerate} + \begin{scriptsize} \item open an anonymous pipe \item duplicate process with fork() \item Parent and Child choose a communication role \begin{itemize} + \begin{scriptsize} \item Sender: close the read-FD and send data to write-FD \item Listener: close the write-FD and listen on read-FD + \end{scriptsize} \end{itemize} + \end{scriptsize} \end{enumerate} \item Note: \begin{itemize} + \begin{scriptsize} \item pipe-syscall opens two file-descriptors \\ (one for read from, and one for write to the pipe) \item after fork-syscall, both processes has access to pipe file-descriptors \item pipe communication is unidirectional + \end{scriptsize} \end{itemize} \item Result \begin{itemize} + \begin{scriptsize} \item private communication between Parent and Child \item decoupled, buffered communication through pipe + \end{scriptsize} \end{itemize} \item other IPC mechanisms (e.g. POSIX IPC) are also possible \end{itemize} |