[$] Moving beyond fork() + exec()

Since the earliest days of Unix, two of the core process-oriented systemcalls have been fork(), which creates a child process as a copy ofthe parent, and exec(), which runs a new program in the place ofthe current one. In Linux kernels, those system calls are better known asclone()and execve(),but the core functionality remains the same. While there is elegance tothis process-creation model, there are shortcomings as well. A recent proposal fromLi Chen to add "spawn templates" to the kernel will not be accepted in itscurrent form, but it may point the way toward a new process-creationprimitive in the future.