Write System call

[AlessandroSangiuliano]

Implement the write system call:

• evaluate in library implementation
• evaluate in (file) server implementation

Path:

• in library: user program -> libc printf -> libc write -> message to the kernel for console writing (CS in Mach) -> all the back path to the user program. PRO: Faster. CONS: most of the code in libc.
• in server: user program -> libc printf -> message to the file server ( CS to the Mach kernel) -> CS to the server -> write execution -> message to Mach for console writing -> all the back path to the user program. PRO: more modular, more microkernel approch. CONS: Slower