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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
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vfs_mountroot.c
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vfs_subr.c
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vfs_syscalls.c
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vfs_vnops.c
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vnode_if.src
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Editing: tty_inq.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org> * All rights reserved. * * Portions of this software were developed under sponsorship from Snow * B.V., the Netherlands. * * 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/lock.h> #include <sys/queue.h> #include <sys/sysctl.h> #include <sys/systm.h> #include <sys/tty.h> #include <sys/uio.h> #include <vm/uma.h> /* * TTY input queue buffering. * * Unlike the output queue, the input queue has more features that are * needed to properly implement various features offered by the TTY * interface: * * - Data can be removed from the tail of the queue, which is used to * implement backspace. * - Once in a while, input has to be `canonicalized'. When ICANON is * turned on, this will be done after a CR has been inserted. * Otherwise, it should be done after any character has been inserted. * - The input queue can store one bit per byte, called the quoting bit. * This bit is used by TTYDISC to make backspace work on quoted * characters. * * In most cases, there is probably less input than output, so unlike * the outq, we'll stick to 128 byte blocks here. */ static int ttyinq_flush_secure = 1; SYSCTL_INT(_kern, OID_AUTO, tty_inq_flush_secure, CTLFLAG_RW, &ttyinq_flush_secure, 0, "Zero buffers while flushing"); #define TTYINQ_QUOTESIZE (TTYINQ_DATASIZE / BMSIZE) #define BMSIZE 32 #define GETBIT(tib,boff) \ ((tib)->tib_quotes[(boff) / BMSIZE] & (1 << ((boff) % BMSIZE))) #define SETBIT(tib,boff) \ ((tib)->tib_quotes[(boff) / BMSIZE] |= (1 << ((boff) % BMSIZE))) #define CLRBIT(tib,boff) \ ((tib)->tib_quotes[(boff) / BMSIZE] &= ~(1 << ((boff) % BMSIZE))) struct ttyinq_block { struct ttyinq_block *tib_prev; struct ttyinq_block *tib_next; uint32_t tib_quotes[TTYINQ_QUOTESIZE]; char tib_data[TTYINQ_DATASIZE]; }; static uma_zone_t ttyinq_zone; #define TTYINQ_INSERT_TAIL(ti, tib) do { \ if (ti->ti_end == 0) { \ tib->tib_prev = NULL; \ tib->tib_next = ti->ti_firstblock; \ ti->ti_firstblock = tib; \ } else { \ tib->tib_prev = ti->ti_lastblock; \ tib->tib_next = ti->ti_lastblock->tib_next; \ ti->ti_lastblock->tib_next = tib; \ } \ if (tib->tib_next != NULL) \ tib->tib_next->tib_prev = tib; \ ti->ti_nblocks++; \ } while (0) #define TTYINQ_REMOVE_HEAD(ti) do { \ ti->ti_firstblock = ti->ti_firstblock->tib_next; \ if (ti->ti_firstblock != NULL) \ ti->ti_firstblock->tib_prev = NULL; \ ti->ti_nblocks--; \ } while (0) #define TTYINQ_RECYCLE(ti, tib) do { \ if (ti->ti_quota <= ti->ti_nblocks) \ uma_zfree(ttyinq_zone, tib); \ else \ TTYINQ_INSERT_TAIL(ti, tib); \ } while (0) int ttyinq_setsize(struct ttyinq *ti, struct tty *tp, size_t size) { struct ttyinq_block *tib; ti->ti_quota = howmany(size, TTYINQ_DATASIZE); while (ti->ti_quota > ti->ti_nblocks) { /* * List is getting bigger. * Add new blocks to the tail of the list. * * We must unlock the TTY temporarily, because we need * to allocate memory. This won't be a problem, because * in the worst case, another thread ends up here, which * may cause us to allocate too many blocks, but this * will be caught by the loop below. */ tty_unlock(tp); tib = uma_zalloc(ttyinq_zone, M_WAITOK); tty_lock(tp); if (tty_gone(tp)) { uma_zfree(ttyinq_zone, tib); return (ENXIO); } TTYINQ_INSERT_TAIL(ti, tib); } return (0); } void ttyinq_free(struct ttyinq *ti) { struct ttyinq_block *tib; ttyinq_flush(ti); ti->ti_quota = 0; while ((tib = ti->ti_firstblock) != NULL) { TTYINQ_REMOVE_HEAD(ti); uma_zfree(ttyinq_zone, tib); } MPASS(ti->ti_nblocks == 0); } int ttyinq_read_uio(struct ttyinq *ti, struct tty *tp, struct uio *uio, size_t rlen, size_t flen) { MPASS(rlen <= uio->uio_resid); while (rlen > 0) { int error; struct ttyinq_block *tib; size_t cbegin, cend, clen; /* See if there still is data. */ if (ti->ti_begin == ti->ti_linestart) return (0); tib = ti->ti_firstblock; if (tib == NULL) return (0); /* * The end address should be the lowest of these three: * - The write pointer * - The blocksize - we can't read beyond the block * - The end address if we could perform the full read */ cbegin = ti->ti_begin; cend = MIN(MIN(ti->ti_linestart, ti->ti_begin + rlen), TTYINQ_DATASIZE); clen = cend - cbegin; MPASS(clen >= flen); rlen -= clen; /* * We can prevent buffering in some cases: * - We need to read the block until the end. * - We don't need to read the block until the end, but * there is no data beyond it, which allows us to move * the write pointer to a new block. */ if (cend == TTYINQ_DATASIZE || cend == ti->ti_end) { /* * Fast path: zero copy. Remove the first block, * so we can unlock the TTY temporarily. */ TTYINQ_REMOVE_HEAD(ti); ti->ti_begin = 0; /* * Because we remove the first block, we must * fix up the block offsets. */ #define CORRECT_BLOCK(t) do { \ if (t <= TTYINQ_DATASIZE) \ t = 0; \ else \ t -= TTYINQ_DATASIZE; \ } while (0) CORRECT_BLOCK(ti->ti_linestart); CORRECT_BLOCK(ti->ti_reprint); CORRECT_BLOCK(ti->ti_end); #undef CORRECT_BLOCK /* * Temporary unlock and copy the data to * userspace. We may need to flush trailing * bytes, like EOF characters. */ tty_unlock(tp); error = uiomove(tib->tib_data + cbegin, clen - flen, uio); tty_lock(tp); /* Block can now be readded to the list. */ TTYINQ_RECYCLE(ti, tib); } else { char ob[TTYINQ_DATASIZE - 1]; /* * Slow path: store data in a temporary buffer. */ memcpy(ob, tib->tib_data + cbegin, clen - flen); ti->ti_begin += clen; MPASS(ti->ti_begin < TTYINQ_DATASIZE); /* Temporary unlock and copy the data to userspace. */ tty_unlock(tp); error = uiomove(ob, clen - flen, uio); tty_lock(tp); } if (error != 0) return (error); if (tty_gone(tp)) return (ENXIO); } return (0); } static __inline void ttyinq_set_quotes(struct ttyinq_block *tib, size_t offset, size_t length, int value) { if (value) { /* Set the bits. */ for (; length > 0; length--, offset++) SETBIT(tib, offset); } else { /* Unset the bits. */ for (; length > 0; length--, offset++) CLRBIT(tib, offset); } } size_t ttyinq_write(struct ttyinq *ti, const void *buf, size_t nbytes, int quote) { const char *cbuf = buf; struct ttyinq_block *tib; unsigned int boff; size_t l; while (nbytes > 0) { boff = ti->ti_end % TTYINQ_DATASIZE; if (ti->ti_end == 0) { /* First time we're being used or drained. */ MPASS(ti->ti_begin == 0); tib = ti->ti_firstblock; if (tib == NULL) { /* Queue has no blocks. */ break; } ti->ti_lastblock = tib; } else if (boff == 0) { /* We reached the end of this block on last write. */ tib = ti->ti_lastblock->tib_next; if (tib == NULL) { /* We've reached the watermark. */ break; } ti->ti_lastblock = tib; } else { tib = ti->ti_lastblock; } /* Don't copy more than was requested. */ l = MIN(nbytes, TTYINQ_DATASIZE - boff); MPASS(l > 0); memcpy(tib->tib_data + boff, cbuf, l); /* Set the quoting bits for the proper region. */ ttyinq_set_quotes(tib, boff, l, quote); cbuf += l; nbytes -= l; ti->ti_end += l; } return (cbuf - (const char *)buf); } int ttyinq_write_nofrag(struct ttyinq *ti, const void *buf, size_t nbytes, int quote) { size_t ret __unused; if (ttyinq_bytesleft(ti) < nbytes) return (-1); /* We should always be able to write it back. */ ret = ttyinq_write(ti, buf, nbytes, quote); MPASS(ret == nbytes); return (0); } void ttyinq_canonicalize(struct ttyinq *ti) { ti->ti_linestart = ti->ti_reprint = ti->ti_end; ti->ti_startblock = ti->ti_reprintblock = ti->ti_lastblock; } size_t ttyinq_findchar(struct ttyinq *ti, const char *breakc, size_t maxlen, char *lastc) { struct ttyinq_block *tib = ti->ti_firstblock; unsigned int boff = ti->ti_begin; unsigned int bend = MIN(MIN(TTYINQ_DATASIZE, ti->ti_linestart), ti->ti_begin + maxlen); MPASS(maxlen > 0); if (tib == NULL) return (0); while (boff < bend) { if (strchr(breakc, tib->tib_data[boff]) && !GETBIT(tib, boff)) { *lastc = tib->tib_data[boff]; return (boff - ti->ti_begin + 1); } boff++; } /* Not found - just process the entire block. */ return (bend - ti->ti_begin); } void ttyinq_flush(struct ttyinq *ti) { struct ttyinq_block *tib; ti->ti_begin = 0; ti->ti_linestart = 0; ti->ti_reprint = 0; ti->ti_end = 0; /* Zero all data in the input queue to get rid of passwords. */ if (ttyinq_flush_secure) { for (tib = ti->ti_firstblock; tib != NULL; tib = tib->tib_next) bzero(&tib->tib_data, sizeof tib->tib_data); } } int ttyinq_peekchar(struct ttyinq *ti, char *c, int *quote) { unsigned int boff; struct ttyinq_block *tib = ti->ti_lastblock; if (ti->ti_linestart == ti->ti_end) return (-1); MPASS(ti->ti_end > 0); boff = (ti->ti_end - 1) % TTYINQ_DATASIZE; *c = tib->tib_data[boff]; *quote = GETBIT(tib, boff); return (0); } void ttyinq_unputchar(struct ttyinq *ti) { MPASS(ti->ti_linestart < ti->ti_end); if (--ti->ti_end % TTYINQ_DATASIZE == 0) { /* Roll back to the previous block. */ ti->ti_lastblock = ti->ti_lastblock->tib_prev; /* * This can only fail if we are unputchar()'ing the * first character in the queue. */ MPASS((ti->ti_lastblock == NULL) == (ti->ti_end == 0)); } } void ttyinq_reprintpos_set(struct ttyinq *ti) { ti->ti_reprint = ti->ti_end; ti->ti_reprintblock = ti->ti_lastblock; } void ttyinq_reprintpos_reset(struct ttyinq *ti) { ti->ti_reprint = ti->ti_linestart; ti->ti_reprintblock = ti->ti_startblock; } static void ttyinq_line_iterate(struct ttyinq *ti, ttyinq_line_iterator_t *iterator, void *data, unsigned int offset, struct ttyinq_block *tib) { unsigned int boff; /* Use the proper block when we're at the queue head. */ if (offset == 0) tib = ti->ti_firstblock; /* Iterate all characters and call the iterator function. */ for (; offset < ti->ti_end; offset++) { boff = offset % TTYINQ_DATASIZE; MPASS(tib != NULL); /* Call back the iterator function. */ iterator(data, tib->tib_data[boff], GETBIT(tib, boff)); /* Last byte iterated - go to the next block. */ if (boff == TTYINQ_DATASIZE - 1) tib = tib->tib_next; MPASS(tib != NULL); } } void ttyinq_line_iterate_from_linestart(struct ttyinq *ti, ttyinq_line_iterator_t *iterator, void *data) { ttyinq_line_iterate(ti, iterator, data, ti->ti_linestart, ti->ti_startblock); } void ttyinq_line_iterate_from_reprintpos(struct ttyinq *ti, ttyinq_line_iterator_t *iterator, void *data) { ttyinq_line_iterate(ti, iterator, data, ti->ti_reprint, ti->ti_reprintblock); } static void ttyinq_startup(void *dummy) { ttyinq_zone = uma_zcreate("ttyinq", sizeof(struct ttyinq_block), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); } SYSINIT(ttyinq, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyinq_startup, NULL);
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