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📄 Make.tags.inc(2.13 KB)
📄 Makefile(302 B)
📄 bus_if.m(26.31 KB)
📄 capabilities.conf(13.67 KB)
📄 clock_if.m(1.7 KB)
📄 cpufreq_if.m(2.27 KB)
📄 device_if.m(10.41 KB)
📄 firmw.S(2.15 KB)
📄 genassym.sh(1.11 KB)
📄 genoffset.c(1.68 KB)
📄 genoffset.sh(3.58 KB)
📄 imgact_aout.c(9.45 KB)
📄 imgact_binmisc.c(18.64 KB)
📄 imgact_elf.c(76.32 KB)
📄 imgact_elf32.c(1.47 KB)
📄 imgact_elf64.c(1.47 KB)
📄 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: subr_msgbuf.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2003 Ian Dowse.  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.
 *
 * $FreeBSD$
 */

/*
 * Generic message buffer support routines.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/kernel.h>
#include <sys/mutex.h>
#include <sys/msgbuf.h>
#include <sys/sysctl.h>

/*
 * Maximum number conversion buffer length: uintmax_t in base 2, plus <>
 * around the priority, and a terminating NUL.
 */
#define	MAXPRIBUF	(sizeof(intmax_t) * NBBY + 3)

/* Read/write sequence numbers are modulo a multiple of the buffer size. */
#define SEQMOD(size) ((size) * 16)

static u_int msgbuf_cksum(struct msgbuf *mbp);

/*
 * Timestamps in msgbuf are useful when trying to diagnose when core dumps
 * or other actions occurred.
 */
static int msgbuf_show_timestamp = 0;
SYSCTL_INT(_kern, OID_AUTO, msgbuf_show_timestamp, CTLFLAG_RWTUN,
    &msgbuf_show_timestamp, 0, "Show timestamp in msgbuf");

/*
 * Initialize a message buffer of the specified size at the specified
 * location. This also zeros the buffer area.
 */
void
msgbuf_init(struct msgbuf *mbp, void *ptr, int size)
{

mbp->msg_ptr = ptr;
	mbp->msg_size = size;
	mbp->msg_seqmod = SEQMOD(size);
	msgbuf_clear(mbp);
	mbp->msg_magic = MSG_MAGIC;
	mbp->msg_lastpri = -1;
	mbp->msg_flags = 0;
	bzero(&mbp->msg_lock, sizeof(mbp->msg_lock));
	mtx_init(&mbp->msg_lock, "msgbuf", NULL, MTX_SPIN);
}

/*
 * Reinitialize a message buffer, retaining its previous contents if
 * the size and checksum are correct. If the old contents cannot be
 * recovered, the message buffer is cleared.
 */
void
msgbuf_reinit(struct msgbuf *mbp, void *ptr, int size)
{
	u_int cksum;

if (mbp->msg_magic != MSG_MAGIC || mbp->msg_size != size) {
		msgbuf_init(mbp, ptr, size);
		return;
	}
	mbp->msg_seqmod = SEQMOD(size);
	mbp->msg_wseq = MSGBUF_SEQNORM(mbp, mbp->msg_wseq);
	mbp->msg_rseq = MSGBUF_SEQNORM(mbp, mbp->msg_rseq);
        mbp->msg_ptr = ptr;
	cksum = msgbuf_cksum(mbp);
	if (cksum != mbp->msg_cksum) {
		if (bootverbose) {
			printf("msgbuf cksum mismatch (read %x, calc %x)\n",
			    mbp->msg_cksum, cksum);
			printf("Old msgbuf not recovered\n");
		}
		msgbuf_clear(mbp);
	}

mbp->msg_lastpri = -1;
	/* Assume that the old message buffer didn't end in a newline. */
	mbp->msg_flags |= MSGBUF_NEEDNL;
	bzero(&mbp->msg_lock, sizeof(mbp->msg_lock));
	mtx_init(&mbp->msg_lock, "msgbuf", NULL, MTX_SPIN);
}

/*
 * Clear the message buffer.
 */
void
msgbuf_clear(struct msgbuf *mbp)
{

bzero(mbp->msg_ptr, mbp->msg_size);
	mbp->msg_wseq = 0;
	mbp->msg_rseq = 0;
	mbp->msg_cksum = 0;
}

/*
 * Get a count of the number of unread characters in the message buffer.
 */
int
msgbuf_getcount(struct msgbuf *mbp)
{
	u_int len;

len = MSGBUF_SEQSUB(mbp, mbp->msg_wseq, mbp->msg_rseq);
	if (len > mbp->msg_size)
		len = mbp->msg_size;
	return (len);
}

/*
 * Add a character into the message buffer, and update the checksum and
 * sequence number.
 *
 * The caller should hold the message buffer spinlock.
 */

static void
msgbuf_do_addchar(struct msgbuf * const mbp, u_int * const seq, const int c)
{
	u_int pos;

/* Make sure we properly wrap the sequence number. */
	pos = MSGBUF_SEQ_TO_POS(mbp, *seq);
	mbp->msg_cksum += (u_int)(u_char)c -
	    (u_int)(u_char)mbp->msg_ptr[pos];
	mbp->msg_ptr[pos] = c;
	*seq = MSGBUF_SEQNORM(mbp, *seq + 1);
}

/*
 * Append a character to a message buffer.
 */
void
msgbuf_addchar(struct msgbuf *mbp, int c)
{
	mtx_lock_spin(&mbp->msg_lock);

msgbuf_do_addchar(mbp, &mbp->msg_wseq, c);

mtx_unlock_spin(&mbp->msg_lock);
}

/*
 * Append a NUL-terminated string with a priority to a message buffer.
 * Filter carriage returns if the caller requests it.
 *
 * XXX The carriage return filtering behavior is present in the
 * msglogchar() API, however testing has shown that we don't seem to send
 * carriage returns down this path.  So do we still need it?
 */
void
msgbuf_addstr(struct msgbuf *mbp, int pri, const char *str, int filter_cr)
{
	u_int seq;
	size_t len, prefix_len;
	char prefix[MAXPRIBUF];
	char buf[32];
	int i, j, needtime;

len = strlen(str);
	prefix_len = 0;

/* If we have a zero-length string, no need to do anything. */
	if (len == 0)
		return;

mtx_lock_spin(&mbp->msg_lock);

/*
	 * If this is true, we may need to insert a new priority sequence,
	 * so prepare the prefix.
	 */
	if (pri != -1)
		prefix_len = sprintf(prefix, "<%d>", pri);

/*
	 * Starting write sequence number.
	 */
	seq = mbp->msg_wseq;

/*
	 * Whenever there is a change in priority, we have to insert a
	 * newline, and a priority prefix if the priority is not -1.  Here
	 * we detect whether there was a priority change, and whether we
	 * did not end with a newline.  If that is the case, we need to
	 * insert a newline before this string.
	 */
	if (mbp->msg_lastpri != pri && (mbp->msg_flags & MSGBUF_NEEDNL) != 0) {
		msgbuf_do_addchar(mbp, &seq, '\n');
		mbp->msg_flags &= ~MSGBUF_NEEDNL;
	}

needtime = 1;
	for (i = 0; i < len; i++) {
		/*
		 * If we just had a newline, and the priority is not -1
		 * (and therefore prefix_len != 0), then we need a priority
		 * prefix for this line.
		 */
		if ((mbp->msg_flags & MSGBUF_NEEDNL) == 0 && prefix_len != 0) {
			int j;

for (j = 0; j < prefix_len; j++)
				msgbuf_do_addchar(mbp, &seq, prefix[j]);
		}

if (msgbuf_show_timestamp && needtime == 1 &&
		    (mbp->msg_flags & MSGBUF_NEEDNL) == 0) {
			snprintf(buf, sizeof(buf), "[%jd] ",
			    (intmax_t)time_uptime);
			for (j = 0; buf[j] != '\0'; j++)
				msgbuf_do_addchar(mbp, &seq, buf[j]);
			needtime = 0;
		}

/*
		 * Don't copy carriage returns if the caller requested
		 * filtering.
		 * 
		 * XXX This matches the behavior of msglogchar(), but is it
		 * necessary?  Testing has shown that we don't seem to get
		 * carriage returns here.
		 */
		if ((filter_cr != 0) && (str[i] == '\r'))
			continue;

/*
		 * Clear this flag if we see a newline.  This affects whether
		 * we need to insert a new prefix or insert a newline later.
		 */
		if (str[i] == '\n')
			mbp->msg_flags &= ~MSGBUF_NEEDNL;
		else
			mbp->msg_flags |= MSGBUF_NEEDNL;

msgbuf_do_addchar(mbp, &seq, str[i]);
	}
	/*
	 * Update the write sequence number for the actual number of
	 * characters we put in the message buffer.  (Depends on whether
	 * carriage returns are filtered.)
	 */
	mbp->msg_wseq = seq;

/*
	 * Set the last priority.
	 */
	mbp->msg_lastpri = pri;

mtx_unlock_spin(&mbp->msg_lock);

}

/*
 * Read and mark as read a character from a message buffer.
 * Returns the character, or -1 if no characters are available.
 */
int
msgbuf_getchar(struct msgbuf *mbp)
{
	u_int len, wseq;
	int c;

mtx_lock_spin(&mbp->msg_lock);

wseq = mbp->msg_wseq;
	len = MSGBUF_SEQSUB(mbp, wseq, mbp->msg_rseq);
	if (len == 0) {
		mtx_unlock_spin(&mbp->msg_lock);
		return (-1);
	}
	if (len > mbp->msg_size)
		mbp->msg_rseq = MSGBUF_SEQNORM(mbp, wseq - mbp->msg_size);
	c = (u_char)mbp->msg_ptr[MSGBUF_SEQ_TO_POS(mbp, mbp->msg_rseq)];
	mbp->msg_rseq = MSGBUF_SEQNORM(mbp, mbp->msg_rseq + 1);

mtx_unlock_spin(&mbp->msg_lock);

return (c);
}

/*
 * Read and mark as read a number of characters from a message buffer.
 * Returns the number of characters that were placed in `buf'.
 */
int
msgbuf_getbytes(struct msgbuf *mbp, char *buf, int buflen)
{
	u_int len, pos, wseq;

mtx_lock_spin(&mbp->msg_lock);

wseq = mbp->msg_wseq;
	len = MSGBUF_SEQSUB(mbp, wseq, mbp->msg_rseq);
	if (len == 0) {
		mtx_unlock_spin(&mbp->msg_lock);
		return (0);
	}
	if (len > mbp->msg_size) {
		mbp->msg_rseq = MSGBUF_SEQNORM(mbp, wseq - mbp->msg_size);
		len = mbp->msg_size;
	}
	pos = MSGBUF_SEQ_TO_POS(mbp, mbp->msg_rseq);
	len = min(len, mbp->msg_size - pos);
	len = min(len, (u_int)buflen);

bcopy(&mbp->msg_ptr[pos], buf, len);
	mbp->msg_rseq = MSGBUF_SEQNORM(mbp, mbp->msg_rseq + len);

mtx_unlock_spin(&mbp->msg_lock);

return (len);
}

/*
 * Peek at the full contents of a message buffer without marking any
 * data as read. `seqp' should point to an unsigned integer that
 * msgbuf_peekbytes() can use to retain state between calls so that
 * the whole message buffer can be read in multiple short reads.
 * To initialise this variable to the start of the message buffer,
 * call msgbuf_peekbytes() with a NULL `buf' parameter.
 *
 * Returns the number of characters that were placed in `buf'.
 */
int
msgbuf_peekbytes(struct msgbuf *mbp, char *buf, int buflen, u_int *seqp)
{
	u_int len, pos, wseq;

mtx_lock_spin(&mbp->msg_lock);

if (buf == NULL) {
		/* Just initialise *seqp. */
		*seqp = MSGBUF_SEQNORM(mbp, mbp->msg_wseq - mbp->msg_size);
		mtx_unlock_spin(&mbp->msg_lock);
		return (0);
	}

wseq = mbp->msg_wseq;
	len = MSGBUF_SEQSUB(mbp, wseq, *seqp);
	if (len == 0) {
		mtx_unlock_spin(&mbp->msg_lock);
		return (0);
	}
	if (len > mbp->msg_size) {
		*seqp = MSGBUF_SEQNORM(mbp, wseq - mbp->msg_size);
		len = mbp->msg_size;
	}
	pos = MSGBUF_SEQ_TO_POS(mbp, *seqp);
	len = min(len, mbp->msg_size - pos);
	len = min(len, (u_int)buflen);
	bcopy(&mbp->msg_ptr[MSGBUF_SEQ_TO_POS(mbp, *seqp)], buf, len);
	*seqp = MSGBUF_SEQNORM(mbp, *seqp + len);

mtx_unlock_spin(&mbp->msg_lock);

return (len);
}

/*
 * Compute the checksum for the complete message buffer contents.
 */
static u_int
msgbuf_cksum(struct msgbuf *mbp)
{
	u_int i, sum;

sum = 0;
	for (i = 0; i < mbp->msg_size; i++)
		sum += (u_char)mbp->msg_ptr[i];
	return (sum);
}

/*
 * Copy from one message buffer to another.
 */
void
msgbuf_copy(struct msgbuf *src, struct msgbuf *dst)
{
	int c;

while ((c = msgbuf_getchar(src)) >= 0)
		msgbuf_addchar(dst, c);
}

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