Systemd blockers #190

• More prctl Implement more of prctl #153
• sys_close_range Partially implement sys_close_range #154
• sys_waitid Implement sys_waitid #166
• sys_clock_settime Implement clock_settime syscall #219
• sys_statfs and sys_fstatfs Implement sys_statfs and sys_fstatfs #203
• sys_mount Mount syscall #196
• sys_flock (stubbed)
• /proc/cmdline procfs: cmdline inode #189
• /dev/shm
• /proc/<pid>/fd/<fd> Partial proc fd file support #222
• sysfs Stub out sysfs and cgroupfs #197
• cgroup filesystem Stub out sysfs and cgroupfs #197 (good enough for now)
• sys_pidfd_open
• sys_sethostname Store hostname and allow for updates via sys_sethostname #201 (fixup not merged)
• sys_copy_file_range Implement copy_file_range syscall #218
• epoll Implement signalfd4 and epoll for systemd #282
• sys_signalfd4 Implement signalfd4 and epoll for systemd #282
• more cgroup systemd part 3: Cgroup2 partial stubbing #285
• inotify systemd part 4: Implement inotify #297
• Path file
• memfd
• shared mmap systemd part 7: implement shared mmap maps #299
• timerfd
• pr_set_mm
• sys_tgkill
• PR_GET/SET_DUMPABLE
• F_ADD_SEALS/F_GET_SEALS
• getsockopt
• socket support Socket support #39

Other issues:

• systemd generators are causing alignment faults.

Read-only remount requires /proc/self/mountinfo.