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📄 Makefile(302 B)
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📄 cpufreq_if.m(2.27 KB)
📄 device_if.m(10.41 KB)
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📄 imgact_elf.c(76.32 KB)
📄 imgact_elf32.c(1.47 KB)
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📄 imgact_shell.c(8.41 KB)
📄 init_main.c(24.31 KB)
📄 init_sysent.c(95.3 KB)
📄 kern_acct.c(19.03 KB)
📄 kern_alq.c(24.97 KB)
📄 kern_clock.c(21.12 KB)
📄 kern_clocksource.c(23.34 KB)
📄 kern_condvar.c(11.28 KB)
📄 kern_conf.c(36.14 KB)
📄 kern_cons.c(15.75 KB)
📄 kern_context.c(3.59 KB)
📄 kern_cpu.c(30.77 KB)
📄 kern_cpuset.c(59.78 KB)
📄 kern_ctf.c(8.73 KB)
📄 kern_descrip.c(112.87 KB)
📄 kern_dtrace.c(2.94 KB)
📄 kern_dump.c(8.51 KB)
📄 kern_environment.c(22.75 KB)
📄 kern_et.c(7.1 KB)
📄 kern_event.c(62.49 KB)
📄 kern_exec.c(46.67 KB)
📄 kern_exit.c(34.61 KB)
📄 kern_fail.c(29.32 KB)
📄 kern_ffclock.c(12.66 KB)
📄 kern_fork.c(28.29 KB)
📄 kern_hhook.c(13.58 KB)
📄 kern_idle.c(2.74 KB)
📄 kern_intr.c(40.44 KB)
📄 kern_jail.c(112.67 KB)
📄 kern_kcov.c(15.32 KB)
📄 kern_khelp.c(9.45 KB)
📄 kern_kthread.c(11.8 KB)
📄 kern_ktr.c(11.93 KB)
📄 kern_ktrace.c(31.41 KB)
📄 kern_linker.c(54.3 KB)
📄 kern_lock.c(46.99 KB)
📄 kern_lockf.c(64.46 KB)
📄 kern_lockstat.c(3.8 KB)
📄 kern_loginclass.c(6.69 KB)
📄 kern_malloc.c(37.09 KB)
📄 kern_mbuf.c(43.16 KB)
📄 kern_mib.c(24.26 KB)
📄 kern_module.c(11.05 KB)
📄 kern_mtxpool.c(5.82 KB)
📄 kern_mutex.c(33.62 KB)
📄 kern_ntptime.c(32.49 KB)
📄 kern_osd.c(12.37 KB)
📄 kern_physio.c(5.74 KB)
📄 kern_pmc.c(8.89 KB)
📄 kern_poll.c(15.86 KB)
📄 kern_priv.c(9.14 KB)
📄 kern_proc.c(80.01 KB)
📄 kern_procctl.c(19.48 KB)
📄 kern_prot.c(57.94 KB)
📄 kern_racct.c(34.01 KB)
📄 kern_rangelock.c(8.67 KB)
📄 kern_rctl.c(53.87 KB)
📄 kern_resource.c(36.66 KB)
📄 kern_rmlock.c(28.27 KB)
📄 kern_rwlock.c(40.72 KB)
📄 kern_sdt.c(2.05 KB)
📄 kern_sema.c(4.85 KB)
📄 kern_sendfile.c(33.97 KB)
📄 kern_sharedpage.c(10.37 KB)
📄 kern_shutdown.c(43.34 KB)
📄 kern_sig.c(101.89 KB)
📄 kern_switch.c(13.85 KB)
📄 kern_sx.c(40.27 KB)
📄 kern_synch.c(18.17 KB)
📄 kern_syscalls.c(6.74 KB)
📄 kern_sysctl.c(67.24 KB)
📄 kern_tc.c(55.73 KB)
📄 kern_thr.c(14.14 KB)
📄 kern_thread.c(41.75 KB)
📄 kern_time.c(40.89 KB)
📄 kern_timeout.c(43.08 KB)
📄 kern_tslog.c(3.44 KB)
📄 kern_ubsan.c(50.74 KB)
📄 kern_umtx.c(107.14 KB)
📄 kern_uuid.c(11.68 KB)
📄 kern_xxx.c(10.44 KB)
📄 ksched.c(6.56 KB)
📄 link_elf.c(47.99 KB)
📄 link_elf_obj.c(44.41 KB)
📄 linker_if.m(3.96 KB)
📄 makesyscalls.sh(23.57 KB)
📄 md4c.c(7.89 KB)
📄 md5c.c(9.56 KB)
📄 msi_if.m(2.48 KB)
📄 p1003_1b.c(8.84 KB)
📄 pic_if.m(3.9 KB)
📄 posix4_mib.c(5.59 KB)
📄 sched_4bsd.c(45.03 KB)
📄 sched_ule.c(82.65 KB)
📄 serdev_if.m(3.49 KB)
📄 stack_protector.c(613 B)
📄 subr_acl_nfs4.c(37.42 KB)
📄 subr_acl_posix1e.c(17.71 KB)
📄 subr_atomic64.c(3.97 KB)
📄 subr_autoconf.c(7.7 KB)
📄 subr_blist.c(31.88 KB)
📄 subr_boot.c(5.8 KB)
📄 subr_bufring.c(2.21 KB)
📄 subr_bus.c(145.4 KB)
📄 subr_bus_dma.c(19.67 KB)
📄 subr_busdma_bufalloc.c(5.24 KB)
📄 subr_capability.c(11.93 KB)
📄 subr_clock.c(10.61 KB)
📄 subr_compressor.c(13.11 KB)
📄 subr_counter.c(4.44 KB)
📄 subr_coverage.c(6.17 KB)
📄 subr_csan.c(25.39 KB)
📄 subr_devmap.c(9.8 KB)
📄 subr_devstat.c(16.21 KB)
📄 subr_disk.c(8.54 KB)
📄 subr_dummy_vdso_tc.c(1.7 KB)
📄 subr_early.c(2.26 KB)
📄 subr_epoch.c(25.02 KB)
📄 subr_eventhandler.c(9.17 KB)
📄 subr_fattime.c(9.98 KB)
📄 subr_filter.c(12.2 KB)
📄 subr_firmware.c(13.88 KB)
📄 subr_gtaskqueue.c(20.19 KB)
📄 subr_hash.c(4.8 KB)
📄 subr_hints.c(12.87 KB)
📄 subr_intr.c(40.61 KB)
📄 subr_kdb.c(16.13 KB)
📄 subr_kobj.c(7.1 KB)
📄 subr_lock.c(18.81 KB)
📄 subr_log.c(7.64 KB)
📄 subr_mchain.c(11.06 KB)
📄 subr_module.c(12.98 KB)
📄 subr_msgbuf.c(10.6 KB)
📄 subr_param.c(10.93 KB)
📄 subr_pcpu.c(10.18 KB)
📄 subr_pctrie.c(20.99 KB)
📄 subr_physmem.c(11.52 KB)
📄 subr_pidctrl.c(5.43 KB)
📄 subr_power.c(3.13 KB)
📄 subr_prf.c(27.42 KB)
📄 subr_prng.c(3.36 KB)
📄 subr_prof.c(15.43 KB)
📄 subr_rangeset.c(8.5 KB)
📄 subr_rman.c(27.61 KB)
📄 subr_rtc.c(11.42 KB)
📄 subr_sbuf.c(20.53 KB)
📄 subr_scanf.c(15.59 KB)
📄 subr_sfbuf.c(6.17 KB)
📄 subr_sglist.c(22.83 KB)
📄 subr_sleepqueue.c(39.43 KB)
📄 subr_smp.c(31.62 KB)
📄 subr_smr.c(20.17 KB)
📄 subr_stack.c(6.47 KB)
📄 subr_stats.c(103.01 KB)
📄 subr_syscall.c(7.98 KB)
📄 subr_taskqueue.c(21.1 KB)
📄 subr_terminal.c(15.52 KB)
📄 subr_trap.c(10.87 KB)
📄 subr_turnstile.c(35.58 KB)
📄 subr_uio.c(11.38 KB)
📄 subr_unit.c(22.97 KB)
📄 subr_vmem.c(43.25 KB)
📄 subr_witness.c(84.59 KB)
📄 sys_capability.c(15.06 KB)
📄 sys_eventfd.c(8.42 KB)
📄 sys_generic.c(44.22 KB)
📄 sys_getrandom.c(4.21 KB)
📄 sys_pipe.c(45.14 KB)
📄 sys_procdesc.c(14.57 KB)
📄 sys_process.c(30.73 KB)
📄 sys_socket.c(20.11 KB)
📄 syscalls.c(22.73 KB)
📄 syscalls.master(60.26 KB)
📄 systrace_args.c(178.49 KB)
📄 sysv_ipc.c(6.53 KB)
📄 sysv_msg.c(48.65 KB)
📄 sysv_sem.c(49.85 KB)
📄 sysv_shm.c(43.93 KB)
📄 tty.c(55.14 KB)
📄 tty_compat.c(11.46 KB)
📄 tty_info.c(9.93 KB)
📄 tty_inq.c(12.22 KB)
📄 tty_outq.c(8.74 KB)
📄 tty_pts.c(19.74 KB)
📄 tty_tty.c(2.83 KB)
📄 tty_ttydisc.c(28.6 KB)
📄 uipc_accf.c(8.07 KB)
📄 uipc_debug.c(12.42 KB)
📄 uipc_domain.c(13.13 KB)
📄 uipc_ktls.c(55.7 KB)
📄 uipc_mbuf.c(52.45 KB)
📄 uipc_mbuf2.c(12.64 KB)
📄 uipc_mbufhash.c(4.9 KB)
📄 uipc_mqueue.c(64.64 KB)
📄 uipc_sem.c(25.18 KB)
📄 uipc_shm.c(50.47 KB)
📄 uipc_sockbuf.c(42.9 KB)
📄 uipc_socket.c(110.61 KB)
📄 uipc_syscalls.c(35.94 KB)
📄 uipc_usrreq.c(75.11 KB)
📄 vfs_acl.c(14.5 KB)
📄 vfs_aio.c(76.32 KB)
📄 vfs_bio.c(145.39 KB)
📄 vfs_cache.c(143.09 KB)
📄 vfs_cluster.c(28.36 KB)
📄 vfs_default.c(33.16 KB)
📄 vfs_export.c(14.55 KB)
📄 vfs_extattr.c(17.91 KB)
📄 vfs_hash.c(6 KB)
📄 vfs_init.c(15.86 KB)
📄 vfs_lookup.c(45.48 KB)
📄 vfs_mount.c(62.58 KB)
📄 vfs_mountroot.c(26.23 KB)
📄 vfs_subr.c(167.52 KB)
📄 vfs_syscalls.c(106.86 KB)
📄 vfs_vnops.c(86.28 KB)
📄 vnode_if.src(13.66 KB)

Editing: sys_procdesc.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2009, 2016 Robert N. M. Watson
 * All rights reserved.
 *
 * This software was developed at the University of Cambridge Computer
 * Laboratory with support from a grant from Google, Inc.
 *
 * Portions of this software were developed by BAE Systems, the University of
 * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
 * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
 * Computing (TC) research program.
 *
 * 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.
 */

/*-
 * FreeBSD process descriptor facility.
 *
 * Some processes are represented by a file descriptor, which will be used in
 * preference to signaling and pids for the purposes of process management,
 * and is, in effect, a form of capability.  When a process descriptor is
 * used with a process, it ceases to be visible to certain traditional UNIX
 * process facilities, such as waitpid(2).
 *
 * Some semantics:
 *
 * - At most one process descriptor will exist for any process, although
 *   references to that descriptor may be held from many processes (or even
 *   be in flight between processes over a local domain socket).
 * - Last close on the process descriptor will terminate the process using
 *   SIGKILL and reparent it to init so that there's a process to reap it
 *   when it's done exiting.
 * - If the process exits before the descriptor is closed, it will not
 *   generate SIGCHLD on termination, or be picked up by waitpid().
 * - The pdkill(2) system call may be used to deliver a signal to the process
 *   using its process descriptor.
 * - The pdwait4(2) system call may be used to block (or not) on a process
 *   descriptor to collect termination information.
 *
 * Open questions:
 *
 * - Will we want to add a pidtoprocdesc(2) system call to allow process
 *   descriptors to be created for processes without pdfork(2)?
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/poll.h>
#include <sys/proc.h>
#include <sys/procdesc.h>
#include <sys/resourcevar.h>
#include <sys/stat.h>
#include <sys/sysproto.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/ucred.h>
#include <sys/user.h>

#include <security/audit/audit.h>

#include <vm/uma.h>

FEATURE(process_descriptors, "Process Descriptors");

MALLOC_DEFINE(M_PROCDESC, "procdesc", "process descriptors");

static fo_poll_t	procdesc_poll;
static fo_kqfilter_t	procdesc_kqfilter;
static fo_stat_t	procdesc_stat;
static fo_close_t	procdesc_close;
static fo_fill_kinfo_t	procdesc_fill_kinfo;

static struct fileops procdesc_ops = {
	.fo_read = invfo_rdwr,
	.fo_write = invfo_rdwr,
	.fo_truncate = invfo_truncate,
	.fo_ioctl = invfo_ioctl,
	.fo_poll = procdesc_poll,
	.fo_kqfilter = procdesc_kqfilter,
	.fo_stat = procdesc_stat,
	.fo_close = procdesc_close,
	.fo_chmod = invfo_chmod,
	.fo_chown = invfo_chown,
	.fo_sendfile = invfo_sendfile,
	.fo_fill_kinfo = procdesc_fill_kinfo,
	.fo_flags = DFLAG_PASSABLE,
};

/*
 * Return a locked process given a process descriptor, or ESRCH if it has
 * died.
 */
int
procdesc_find(struct thread *td, int fd, cap_rights_t *rightsp,
    struct proc **p)
{
	struct procdesc *pd;
	struct file *fp;
	int error;

error = fget(td, fd, rightsp, &fp);
	if (error)
		return (error);
	if (fp->f_type != DTYPE_PROCDESC) {
		error = EBADF;
		goto out;
	}
	pd = fp->f_data;
	sx_slock(&proctree_lock);
	if (pd->pd_proc != NULL) {
		*p = pd->pd_proc;
		PROC_LOCK(*p);
	} else
		error = ESRCH;
	sx_sunlock(&proctree_lock);
out:
	fdrop(fp, td);
	return (error);
}

/*
 * Function to be used by procstat(1) sysctls when returning procdesc
 * information.
 */
pid_t
procdesc_pid(struct file *fp_procdesc)
{
	struct procdesc *pd;

KASSERT(fp_procdesc->f_type == DTYPE_PROCDESC,
	   ("procdesc_pid: !procdesc"));

pd = fp_procdesc->f_data;
	return (pd->pd_pid);
}

/*
 * Retrieve the PID associated with a process descriptor.
 */
int
kern_pdgetpid(struct thread *td, int fd, cap_rights_t *rightsp, pid_t *pidp)
{
	struct file *fp;
	int error;

error = fget(td, fd, rightsp, &fp);
	if (error)
		return (error);
	if (fp->f_type != DTYPE_PROCDESC) {
		error = EBADF;
		goto out;
	}
	*pidp = procdesc_pid(fp);
out:
	fdrop(fp, td);
	return (error);
}

/*
 * System call to return the pid of a process given its process descriptor.
 */
int
sys_pdgetpid(struct thread *td, struct pdgetpid_args *uap)
{
	pid_t pid;
	int error;

AUDIT_ARG_FD(uap->fd);
	error = kern_pdgetpid(td, uap->fd, &cap_pdgetpid_rights, &pid);
	if (error == 0)
		error = copyout(&pid, uap->pidp, sizeof(pid));
	return (error);
}

/*
 * When a new process is forked by pdfork(), a file descriptor is allocated
 * by the fork code first, then the process is forked, and then we get a
 * chance to set up the process descriptor.  Failure is not permitted at this
 * point, so procdesc_new() must succeed.
 */
void
procdesc_new(struct proc *p, int flags)
{
	struct procdesc *pd;

pd = malloc(sizeof(*pd), M_PROCDESC, M_WAITOK | M_ZERO);
	pd->pd_proc = p;
	pd->pd_pid = p->p_pid;
	p->p_procdesc = pd;
	pd->pd_flags = 0;
	if (flags & PD_DAEMON)
		pd->pd_flags |= PDF_DAEMON;
	PROCDESC_LOCK_INIT(pd);
	knlist_init_mtx(&pd->pd_selinfo.si_note, &pd->pd_lock);

/*
	 * Process descriptors start out with two references: one from their
	 * struct file, and the other from their struct proc.
	 */
	refcount_init(&pd->pd_refcount, 2);
}

/*
 * Create a new process decriptor for the process that refers to it.
 */
int
procdesc_falloc(struct thread *td, struct file **resultfp, int *resultfd,
    int flags, struct filecaps *fcaps)
{
	int fflags;

fflags = 0;
	if (flags & PD_CLOEXEC)
		fflags = O_CLOEXEC;

return (falloc_caps(td, resultfp, resultfd, fflags, fcaps));
}

/*
 * Initialize a file with a process descriptor.
 */
void
procdesc_finit(struct procdesc *pdp, struct file *fp)
{

finit(fp, FREAD | FWRITE, DTYPE_PROCDESC, pdp, &procdesc_ops);
}

static void
procdesc_free(struct procdesc *pd)
{

/*
	 * When the last reference is released, we assert that the descriptor
	 * has been closed, but not that the process has exited, as we will
	 * detach the descriptor before the process dies if the descript is
	 * closed, as we can't wait synchronously.
	 */
	if (refcount_release(&pd->pd_refcount)) {
		KASSERT(pd->pd_proc == NULL,
		    ("procdesc_free: pd_proc != NULL"));
		KASSERT((pd->pd_flags & PDF_CLOSED),
		    ("procdesc_free: !PDF_CLOSED"));

knlist_destroy(&pd->pd_selinfo.si_note);
		PROCDESC_LOCK_DESTROY(pd);
		free(pd, M_PROCDESC);
	}
}

/*
 * procdesc_exit() - notify a process descriptor that its process is exiting.
 * We use the proctree_lock to ensure that process exit either happens
 * strictly before or strictly after a concurrent call to procdesc_close().
 */
int
procdesc_exit(struct proc *p)
{
	struct procdesc *pd;

sx_assert(&proctree_lock, SA_XLOCKED);
	PROC_LOCK_ASSERT(p, MA_OWNED);
	KASSERT(p->p_procdesc != NULL, ("procdesc_exit: p_procdesc NULL"));

pd = p->p_procdesc;

PROCDESC_LOCK(pd);
	KASSERT((pd->pd_flags & PDF_CLOSED) == 0 || p->p_pptr == p->p_reaper,
	    ("procdesc_exit: closed && parent not reaper"));

pd->pd_flags |= PDF_EXITED;
	pd->pd_xstat = KW_EXITCODE(p->p_xexit, p->p_xsig);

/*
	 * If the process descriptor has been closed, then we have nothing
	 * to do; return 1 so that init will get SIGCHLD and do the reaping.
	 * Clean up the procdesc now rather than letting it happen during
	 * that reap.
	 */
	if (pd->pd_flags & PDF_CLOSED) {
		PROCDESC_UNLOCK(pd);
		pd->pd_proc = NULL;
		p->p_procdesc = NULL;
		procdesc_free(pd);
		return (1);
	}
	if (pd->pd_flags & PDF_SELECTED) {
		pd->pd_flags &= ~PDF_SELECTED;
		selwakeup(&pd->pd_selinfo);
	}
	KNOTE_LOCKED(&pd->pd_selinfo.si_note, NOTE_EXIT);
	PROCDESC_UNLOCK(pd);
	return (0);
}

/*
 * When a process descriptor is reaped, perhaps as a result of close() or
 * pdwait4(), release the process's reference on the process descriptor.
 */
void
procdesc_reap(struct proc *p)
{
	struct procdesc *pd;

sx_assert(&proctree_lock, SA_XLOCKED);
	KASSERT(p->p_procdesc != NULL, ("procdesc_reap: p_procdesc == NULL"));

pd = p->p_procdesc;
	pd->pd_proc = NULL;
	p->p_procdesc = NULL;
	procdesc_free(pd);
}

/*
 * procdesc_close() - last close on a process descriptor.  If the process is
 * still running, terminate with SIGKILL (unless PDF_DAEMON is set) and let
 * its reaper clean up the mess; if not, we have to clean up the zombie
 * ourselves.
 */
static int
procdesc_close(struct file *fp, struct thread *td)
{
	struct procdesc *pd;
	struct proc *p;

KASSERT(fp->f_type == DTYPE_PROCDESC, ("procdesc_close: !procdesc"));

pd = fp->f_data;
	fp->f_ops = &badfileops;
	fp->f_data = NULL;

sx_xlock(&proctree_lock);
	PROCDESC_LOCK(pd);
	pd->pd_flags |= PDF_CLOSED;
	PROCDESC_UNLOCK(pd);
	p = pd->pd_proc;
	if (p == NULL) {
		/*
		 * This is the case where process' exit status was already
		 * collected and procdesc_reap() was already called.
		 */
		sx_xunlock(&proctree_lock);
	} else {
		PROC_LOCK(p);
		AUDIT_ARG_PROCESS(p);
		if (p->p_state == PRS_ZOMBIE) {
			/*
			 * If the process is already dead and just awaiting
			 * reaping, do that now.  This will release the
			 * process's reference to the process descriptor when it
			 * calls back into procdesc_reap().
			 */
			proc_reap(curthread, p, NULL, 0);
		} else {
			/*
			 * If the process is not yet dead, we need to kill it,
			 * but we can't wait around synchronously for it to go
			 * away, as that path leads to madness (and deadlocks).
			 * First, detach the process from its descriptor so that
			 * its exit status will be reported normally.
			 */
			pd->pd_proc = NULL;
			p->p_procdesc = NULL;
			procdesc_free(pd);

/*
			 * Next, reparent it to its reaper (usually init(8)) so
			 * that there's someone to pick up the pieces; finally,
			 * terminate with prejudice.
			 */
			p->p_sigparent = SIGCHLD;
			if ((p->p_flag & P_TRACED) == 0) {
				proc_reparent(p, p->p_reaper, true);
			} else {
				proc_clear_orphan(p);
				p->p_oppid = p->p_reaper->p_pid;
				proc_add_orphan(p, p->p_reaper);
			}
			if ((pd->pd_flags & PDF_DAEMON) == 0)
				kern_psignal(p, SIGKILL);
			PROC_UNLOCK(p);
			sx_xunlock(&proctree_lock);
		}
	}

/*
	 * Release the file descriptor's reference on the process descriptor.
	 */
	procdesc_free(pd);
	return (0);
}

static int
procdesc_poll(struct file *fp, int events, struct ucred *active_cred,
    struct thread *td)
{
	struct procdesc *pd;
	int revents;

revents = 0;
	pd = fp->f_data;
	PROCDESC_LOCK(pd);
	if (pd->pd_flags & PDF_EXITED)
		revents |= POLLHUP;
	if (revents == 0) {
		selrecord(td, &pd->pd_selinfo);
		pd->pd_flags |= PDF_SELECTED;
	}
	PROCDESC_UNLOCK(pd);
	return (revents);
}

static void
procdesc_kqops_detach(struct knote *kn)
{
	struct procdesc *pd;

pd = kn->kn_fp->f_data;
	knlist_remove(&pd->pd_selinfo.si_note, kn, 0);
}

static int
procdesc_kqops_event(struct knote *kn, long hint)
{
	struct procdesc *pd;
	u_int event;

pd = kn->kn_fp->f_data;
	if (hint == 0) {
		/*
		 * Initial test after registration. Generate a NOTE_EXIT in
		 * case the process already terminated before registration.
		 */
		event = pd->pd_flags & PDF_EXITED ? NOTE_EXIT : 0;
	} else {
		/* Mask off extra data. */
		event = (u_int)hint & NOTE_PCTRLMASK;
	}

/* If the user is interested in this event, record it. */
	if (kn->kn_sfflags & event)
		kn->kn_fflags |= event;

/* Process is gone, so flag the event as finished. */
	if (event == NOTE_EXIT) {
		kn->kn_flags |= EV_EOF | EV_ONESHOT;
		if (kn->kn_fflags & NOTE_EXIT)
			kn->kn_data = pd->pd_xstat;
		if (kn->kn_fflags == 0)
			kn->kn_flags |= EV_DROP;
		return (1);
	}

return (kn->kn_fflags != 0);
}

static struct filterops procdesc_kqops = {
	.f_isfd = 1,
	.f_detach = procdesc_kqops_detach,
	.f_event = procdesc_kqops_event,
};

static int
procdesc_kqfilter(struct file *fp, struct knote *kn)
{
	struct procdesc *pd;

pd = fp->f_data;
	switch (kn->kn_filter) {
	case EVFILT_PROCDESC:
		kn->kn_fop = &procdesc_kqops;
		kn->kn_flags |= EV_CLEAR;
		knlist_add(&pd->pd_selinfo.si_note, kn, 0);
		return (0);
	default:
		return (EINVAL);
	}
}

static int
procdesc_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
    struct thread *td)
{
	struct procdesc *pd;
	struct timeval pstart, boottime;

/*
	 * XXXRW: Perhaps we should cache some more information from the
	 * process so that we can return it reliably here even after it has
	 * died.  For example, caching its credential data.
	 */
	bzero(sb, sizeof(*sb));
	pd = fp->f_data;
	sx_slock(&proctree_lock);
	if (pd->pd_proc != NULL) {
		PROC_LOCK(pd->pd_proc);
		AUDIT_ARG_PROCESS(pd->pd_proc);

/* Set birth and [acm] times to process start time. */
		pstart = pd->pd_proc->p_stats->p_start;
		getboottime(&boottime);
		timevaladd(&pstart, &boottime);
		TIMEVAL_TO_TIMESPEC(&pstart, &sb->st_birthtim);
		sb->st_atim = sb->st_birthtim;
		sb->st_ctim = sb->st_birthtim;
		sb->st_mtim = sb->st_birthtim;
		if (pd->pd_proc->p_state != PRS_ZOMBIE)
			sb->st_mode = S_IFREG | S_IRWXU;
		else
			sb->st_mode = S_IFREG;
		sb->st_uid = pd->pd_proc->p_ucred->cr_ruid;
		sb->st_gid = pd->pd_proc->p_ucred->cr_rgid;
		PROC_UNLOCK(pd->pd_proc);
	} else
		sb->st_mode = S_IFREG;
	sx_sunlock(&proctree_lock);
	return (0);
}

static int
procdesc_fill_kinfo(struct file *fp, struct kinfo_file *kif,
    struct filedesc *fdp)
{
	struct procdesc *pdp;

kif->kf_type = KF_TYPE_PROCDESC;
	pdp = fp->f_data;
	kif->kf_un.kf_proc.kf_pid = pdp->pd_pid;
	return (0);
}

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