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=== Exec - Process Creation === In VSTa, the kernel does not know about any file formats (a.out, etc), instead, libc is responsible for setting up the new process and calling the kernel "exec()". An execv() is implemented as the process opening the target a.out with a mmap()-type mapping of an open file, verifying that it is sane, then building a table of offsets and protections for the open file. It then calls the VSTa exec() syscall, which simply replaces your address space with the mappings described by the table. The process is re-entered at the PC value it specifies in the exec() call, and you're now running with the new executable. Page faults are converted into FS_READ requests to the server of the open file. Full copy-on-write is not supported, but VSTa can break your association with a mapped page as you write it. This is enough to do exec().