GitLab

ABI stabilization (WIP)

A large part of growing the adoption of a kernel is to stabilize the ABI used. I would like to work on a stable ABI in the next few months, and a 1.0 version of the kernel and syscall crate. I am proposing the following for ABI stabilization:

Move most file operations to the fd

• Change chmod(path, mode) to fchmod(fd, mode)
• Add fchown(fd, owner, group) already added

Make dup less magical

• Change dup(fd, buf) to dup(fd)
• Change dup2(fd, newfd, buf) to dup2(fd, newfd, buf)
• Add openat(fd, path, flags)

Use standard methods for memory management

• Use fmap to implement physmap
• Use funmap to implement physunmap
• Use open to implement physalloc
• Use close to implement physfree
• Remove virttophys
• Consider using fmap to implement brk (SYS_BRK has already been removed from the kernel)

Cleanup other syscalls

• Use open and openat to implement pipe2
• Implement or remove link(old, new)