POSIX systems programming patterns in C. Only trigger when the task specifically involves: fork/exec/wait process management, signal handling with sigaction, pipe/IPC/inter-process communication, file descriptor I/O (open/read/write/close), file locking with fcntl, or directory traversal with opendi
POSIX systems programming patterns in C. Only trigger when the task specifically involves: fork/exec/wait process management, signal handling with sigaction, pipe/IPC/inter-process communication, file descriptor I/O (open/read/write/close), file locking with fcntl, or directory traversal with opendir/readdir. Do NOT trigger for general C programming, memory management, or data structures.