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Make.tags.inc
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Makefile
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bus_if.m
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capabilities.conf
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clock_if.m
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cpufreq_if.m
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device_if.m
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firmw.S
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genassym.sh
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genoffset.c
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genoffset.sh
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imgact_aout.c
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imgact_binmisc.c
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imgact_elf.c
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imgact_elf32.c
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imgact_elf64.c
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imgact_shell.c
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init_main.c
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init_sysent.c
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kern_acct.c
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kern_alq.c
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kern_clock.c
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kern_clocksource.c
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kern_condvar.c
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kern_conf.c
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kern_cons.c
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kern_context.c
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kern_cpu.c
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kern_cpuset.c
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kern_ctf.c
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kern_descrip.c
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kern_dtrace.c
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kern_dump.c
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kern_environment.c
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kern_et.c
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kern_event.c
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kern_exec.c
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kern_exit.c
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kern_fail.c
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kern_ffclock.c
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kern_fork.c
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kern_hhook.c
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kern_idle.c
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kern_intr.c
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kern_jail.c
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kern_kcov.c
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kern_khelp.c
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kern_kthread.c
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kern_ktr.c
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kern_ktrace.c
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kern_linker.c
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kern_lock.c
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kern_lockf.c
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kern_lockstat.c
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kern_loginclass.c
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kern_malloc.c
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kern_mbuf.c
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kern_mib.c
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kern_module.c
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kern_mtxpool.c
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kern_mutex.c
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kern_ntptime.c
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kern_osd.c
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kern_physio.c
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kern_pmc.c
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kern_poll.c
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kern_priv.c
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kern_proc.c
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kern_procctl.c
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kern_prot.c
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kern_racct.c
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kern_rangelock.c
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kern_rctl.c
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kern_resource.c
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kern_rmlock.c
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kern_rwlock.c
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kern_sdt.c
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kern_sema.c
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kern_sendfile.c
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kern_sharedpage.c
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kern_shutdown.c
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kern_sig.c
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kern_switch.c
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kern_sx.c
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kern_synch.c
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kern_syscalls.c
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kern_sysctl.c
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kern_tc.c
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kern_thr.c
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kern_thread.c
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kern_time.c
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kern_timeout.c
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kern_tslog.c
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kern_ubsan.c
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kern_umtx.c
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kern_uuid.c
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kern_xxx.c
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ksched.c
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link_elf.c
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link_elf_obj.c
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linker_if.m
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makesyscalls.sh
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md4c.c
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md5c.c
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msi_if.m
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p1003_1b.c
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pic_if.m
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posix4_mib.c
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sched_4bsd.c
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sched_ule.c
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serdev_if.m
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stack_protector.c
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subr_acl_nfs4.c
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subr_acl_posix1e.c
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subr_atomic64.c
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subr_autoconf.c
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subr_blist.c
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subr_boot.c
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subr_bufring.c
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subr_bus.c
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subr_bus_dma.c
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subr_busdma_bufalloc.c
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subr_capability.c
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subr_clock.c
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subr_compressor.c
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subr_counter.c
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subr_coverage.c
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subr_csan.c
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subr_devmap.c
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subr_devstat.c
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subr_disk.c
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subr_dummy_vdso_tc.c
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subr_early.c
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subr_epoch.c
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subr_eventhandler.c
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subr_fattime.c
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subr_filter.c
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subr_firmware.c
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subr_gtaskqueue.c
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subr_hash.c
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subr_hints.c
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subr_intr.c
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subr_kdb.c
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subr_kobj.c
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subr_lock.c
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subr_log.c
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subr_mchain.c
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subr_module.c
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subr_msgbuf.c
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subr_param.c
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subr_pcpu.c
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subr_pctrie.c
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subr_physmem.c
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subr_pidctrl.c
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subr_power.c
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subr_prf.c
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subr_prng.c
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subr_prof.c
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subr_rangeset.c
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subr_rman.c
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subr_rtc.c
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subr_sbuf.c
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subr_scanf.c
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subr_sfbuf.c
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subr_sglist.c
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subr_sleepqueue.c
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subr_smp.c
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subr_smr.c
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subr_stack.c
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subr_stats.c
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subr_syscall.c
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subr_taskqueue.c
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subr_terminal.c
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subr_trap.c
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subr_turnstile.c
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subr_uio.c
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subr_unit.c
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subr_vmem.c
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subr_witness.c
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sys_capability.c
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sys_eventfd.c
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sys_generic.c
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sys_getrandom.c
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sys_pipe.c
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sys_procdesc.c
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sys_process.c
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sys_socket.c
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syscalls.c
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syscalls.master
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systrace_args.c
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sysv_ipc.c
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sysv_msg.c
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sysv_sem.c
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sysv_shm.c
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tty.c
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tty_compat.c
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tty_info.c
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tty_inq.c
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tty_outq.c
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tty_pts.c
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tty_tty.c
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tty_ttydisc.c
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uipc_accf.c
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uipc_debug.c
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uipc_domain.c
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uipc_ktls.c
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uipc_mbuf.c
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uipc_mbuf2.c
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uipc_mbufhash.c
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uipc_mqueue.c
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uipc_sem.c
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uipc_shm.c
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uipc_sockbuf.c
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uipc_socket.c
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uipc_syscalls.c
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uipc_usrreq.c
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vfs_acl.c
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vfs_aio.c
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vfs_bio.c
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vfs_cache.c
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vfs_cluster.c
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vfs_default.c
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vfs_export.c
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vfs_extattr.c
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vfs_hash.c
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vfs_init.c
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vfs_lookup.c
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vfs_mount.c
(62.58 KB)
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vfs_mountroot.c
(26.23 KB)
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vfs_subr.c
(167.52 KB)
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vfs_syscalls.c
(106.86 KB)
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vfs_vnops.c
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vnode_if.src
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Editing: subr_eventhandler.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 1999 Michael Smith <msmith@freebsd.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/kernel.h> #include <sys/ktr.h> #include <sys/lock.h> #include <sys/malloc.h> #include <sys/mutex.h> #include <sys/proc.h> #include <sys/systm.h> #include <sys/eventhandler.h> static MALLOC_DEFINE(M_EVENTHANDLER, "eventhandler", "Event handler records"); /* List of all eventhandler lists */ static TAILQ_HEAD(, eventhandler_list) eventhandler_lists; static int eventhandler_lists_initted = 0; static struct mtx eventhandler_mutex; struct eventhandler_entry_generic { struct eventhandler_entry ee; void (* func)(void); }; static struct eventhandler_list *_eventhandler_find_list(const char *name); /* * Initialize the eventhandler mutex and list. */ static void eventhandler_init(void *dummy __unused) { TAILQ_INIT(&eventhandler_lists); mtx_init(&eventhandler_mutex, "eventhandler", NULL, MTX_DEF); atomic_store_rel_int(&eventhandler_lists_initted, 1); } SYSINIT(eventhandlers, SI_SUB_EVENTHANDLER, SI_ORDER_FIRST, eventhandler_init, NULL); static struct eventhandler_list * eventhandler_find_or_create_list(const char *name) { struct eventhandler_list *list, *new_list; /* look for a matching, existing list */ list = _eventhandler_find_list(name); /* Do we need to create the list? */ if (list == NULL) { mtx_unlock(&eventhandler_mutex); new_list = malloc(sizeof(*new_list) + strlen(name) + 1, M_EVENTHANDLER, M_WAITOK | M_ZERO); /* If someone else created it already, then use that one. */ mtx_lock(&eventhandler_mutex); list = _eventhandler_find_list(name); if (list != NULL) { free(new_list, M_EVENTHANDLER); } else { CTR2(KTR_EVH, "%s: creating list \"%s\"", __func__, name); list = new_list; TAILQ_INIT(&list->el_entries); list->el_name = (char *)(list + 1); strcpy(list->el_name, name); mtx_init(&list->el_lock, list->el_name, "eventhandler list", MTX_DEF); TAILQ_INSERT_HEAD(&eventhandler_lists, list, el_link); } } return (list); } /* * Insertion is O(n) due to the priority scan, but optimises to O(1) * if all priorities are identical. */ static eventhandler_tag eventhandler_register_internal(struct eventhandler_list *list, const char *name, eventhandler_tag epn) { struct eventhandler_entry *ep; KASSERT(eventhandler_lists_initted, ("eventhandler registered too early")); KASSERT(epn != NULL, ("%s: cannot register NULL event", __func__)); /* Do we need to find/create the list? */ if (list == NULL) { mtx_lock(&eventhandler_mutex); list = eventhandler_find_or_create_list(name); mtx_unlock(&eventhandler_mutex); } KASSERT(epn->ee_priority != EHE_DEAD_PRIORITY, ("%s: handler for %s registered with dead priority", __func__, name)); /* sort it into the list */ CTR4(KTR_EVH, "%s: adding item %p (function %p) to \"%s\"", __func__, epn, ((struct eventhandler_entry_generic *)epn)->func, name); EHL_LOCK(list); TAILQ_FOREACH(ep, &list->el_entries, ee_link) { if (ep->ee_priority != EHE_DEAD_PRIORITY && epn->ee_priority < ep->ee_priority) { TAILQ_INSERT_BEFORE(ep, epn, ee_link); break; } } if (ep == NULL) TAILQ_INSERT_TAIL(&list->el_entries, epn, ee_link); EHL_UNLOCK(list); return(epn); } eventhandler_tag eventhandler_register(struct eventhandler_list *list, const char *name, void *func, void *arg, int priority) { struct eventhandler_entry_generic *eg; /* allocate an entry for this handler, populate it */ eg = malloc(sizeof(struct eventhandler_entry_generic), M_EVENTHANDLER, M_WAITOK | M_ZERO); eg->func = func; eg->ee.ee_arg = arg; eg->ee.ee_priority = priority; return (eventhandler_register_internal(list, name, &eg->ee)); } #ifdef VIMAGE struct eventhandler_entry_generic_vimage { struct eventhandler_entry ee; vimage_iterator_func_t func; /* Vimage iterator function. */ struct eventhandler_entry_vimage v_ee; /* Original func, arg. */ }; eventhandler_tag vimage_eventhandler_register(struct eventhandler_list *list, const char *name, void *func, void *arg, int priority, vimage_iterator_func_t iterfunc) { struct eventhandler_entry_generic_vimage *eg; /* allocate an entry for this handler, populate it */ eg = malloc(sizeof(struct eventhandler_entry_generic_vimage), M_EVENTHANDLER, M_WAITOK | M_ZERO); eg->func = iterfunc; eg->v_ee.func = func; eg->v_ee.ee_arg = arg; eg->ee.ee_arg = &eg->v_ee; eg->ee.ee_priority = priority; return (eventhandler_register_internal(list, name, &eg->ee)); } #endif static void _eventhandler_deregister(struct eventhandler_list *list, eventhandler_tag tag, bool wait) { struct eventhandler_entry *ep = tag; EHL_LOCK_ASSERT(list, MA_OWNED); if (ep != NULL) { /* remove just this entry */ if (list->el_runcount == 0) { CTR3(KTR_EVH, "%s: removing item %p from \"%s\"", __func__, ep, list->el_name); TAILQ_REMOVE(&list->el_entries, ep, ee_link); free(ep, M_EVENTHANDLER); } else { CTR3(KTR_EVH, "%s: marking item %p from \"%s\" as dead", __func__, ep, list->el_name); ep->ee_priority = EHE_DEAD_PRIORITY; } } else { /* remove entire list */ if (list->el_runcount == 0) { CTR2(KTR_EVH, "%s: removing all items from \"%s\"", __func__, list->el_name); while (!TAILQ_EMPTY(&list->el_entries)) { ep = TAILQ_FIRST(&list->el_entries); TAILQ_REMOVE(&list->el_entries, ep, ee_link); free(ep, M_EVENTHANDLER); } } else { CTR2(KTR_EVH, "%s: marking all items from \"%s\" as dead", __func__, list->el_name); TAILQ_FOREACH(ep, &list->el_entries, ee_link) ep->ee_priority = EHE_DEAD_PRIORITY; } } while (wait && list->el_runcount > 0) mtx_sleep(list, &list->el_lock, 0, "evhrm", 0); EHL_UNLOCK(list); } void eventhandler_deregister(struct eventhandler_list *list, eventhandler_tag tag) { _eventhandler_deregister(list, tag, true); } void eventhandler_deregister_nowait(struct eventhandler_list *list, eventhandler_tag tag) { _eventhandler_deregister(list, tag, false); } /* * Internal version for use when eventhandler list is already locked. */ static struct eventhandler_list * _eventhandler_find_list(const char *name) { struct eventhandler_list *list; mtx_assert(&eventhandler_mutex, MA_OWNED); TAILQ_FOREACH(list, &eventhandler_lists, el_link) { if (!strcmp(name, list->el_name)) break; } return (list); } /* * Lookup a "slow" list by name. Returns with the list locked. */ struct eventhandler_list * eventhandler_find_list(const char *name) { struct eventhandler_list *list; if (!eventhandler_lists_initted) return(NULL); /* scan looking for the requested list */ mtx_lock(&eventhandler_mutex); list = _eventhandler_find_list(name); if (list != NULL) EHL_LOCK(list); mtx_unlock(&eventhandler_mutex); return(list); } /* * Prune "dead" entries from an eventhandler list. */ void eventhandler_prune_list(struct eventhandler_list *list) { struct eventhandler_entry *ep, *en; int pruned = 0; CTR2(KTR_EVH, "%s: pruning list \"%s\"", __func__, list->el_name); EHL_LOCK_ASSERT(list, MA_OWNED); TAILQ_FOREACH_SAFE(ep, &list->el_entries, ee_link, en) { if (ep->ee_priority == EHE_DEAD_PRIORITY) { TAILQ_REMOVE(&list->el_entries, ep, ee_link); free(ep, M_EVENTHANDLER); pruned++; } } if (pruned > 0) wakeup(list); } /* * Create (or get the existing) list so the pointer can be stored by * EVENTHANDLER_LIST_DEFINE. */ struct eventhandler_list * eventhandler_create_list(const char *name) { struct eventhandler_list *list; KASSERT(eventhandler_lists_initted, ("eventhandler list created too early")); mtx_lock(&eventhandler_mutex); list = eventhandler_find_or_create_list(name); mtx_unlock(&eventhandler_mutex); return (list); }
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