Final answer:
The jacketing technique is used to convert a blocking system call into a nonblocking system call. It allows a process to continue execution without being halted until the operation's completion by using asynchronous operations, callbacks, or threads.
Step-by-step explanation:
The jacketing technique is primarily used in the context of systems programming and operating systems. Its main purpose is to convert a blocking system call into a nonblocking system call. When a system call is blocking, it means the calling process is halted until the operation associated with the system call is completed. Jacketing involves using mechanisms such as asynchronous operations, callbacks, or threads to allow the process that issued the call to continue execution and to check on the operation's progress or be notified upon its completion without being blocked. Therefore, the correct answer is a) Convert a blocking system call into nonblocking system call.