ZuriHac 2020 hatrace: syscalls to implement

syscalls.md

Easy

FS

• change directory: chdir, fchdir
• change permissions: chmod, fchmod, fchmodat
• change ownership: chown, fchown, lchown, fchownat
• duplicate file descriptors: dup, dup2, dup3
• create file descriptor for even notifications: eventfd, eventfd2, the latter is used by GHC RTS
• FS synchronization: fdatasync, fsync, sync, syncfs - could be useful for checking if writes done by a program are durable
• truncate file: truncate, ftruncate
• create directory: mkdir, mkdirat
• remove directory: rmdir
• reposition file offset: lseek
• get current working directory: getcwd
• open an epoll file descriptor: epoll_create, epoll_create1, used by GHC RTS, makes sense to implement with epoll_wait/epoll_ctl

Misc

• getting/setting user/group ids: getuid, setuid, getgid, setgid
• getting effective user/group ids: geteuid, getegid

Medium

FS

• directory entries: getdents, getdents64
• locking: futex, used by GHC RTS

Networking

• help Stefan with his connect PR so some other syscalls could reuse some data types

Misc

• resource usage: getrusage, used by GHC RTS

Hard

FS

• control interface for an epoll file descriptor: epoll_ctl, used by GHC RTS, see also epoll_create and epoll_wait
• wait for an I/O event on an epoll file descriptor: epoll_wait/epoll_pwait, used by GHC RTS, see also epoll_create and epoll_ctl

Misc

• execute BPF program: bpf