653 lines
21 KiB
Groff
653 lines
21 KiB
Groff
.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)sysctl.3 8.1 (Berkeley) 6/4/93
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.\"
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.Dd "June 4, 1993"
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.Dt SYSCTL 3
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.Os
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.Sh NAME
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.Nm sysctl
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.Nd get or set system information
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.Sh SYNOPSIS
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.Fd #include <sys/sysctl.h>
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.Ft int
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.Fn sysctl "int *name" "u_int namelen" "void *oldp" "size_t *oldlenp" "void *newp" "size_t newlen"
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.Sh DESCRIPTION
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The
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.Nm sysctl
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function retrieves system information and allows processes with
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appropriate privileges to set system information.
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The information available from
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.Nm sysctl
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consists of integers, strings, and tables.
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Information may be retrieved and set from the command interface
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using the
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.Xr sysctl 8
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utility.
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.Pp
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Unless explicitly noted below,
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.Nm sysctl
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returns a consistent snapshot of the data requested.
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Consistency is obtained by locking the destination
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buffer into memory so that the data may be copied out without blocking.
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Calls to
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.Nm sysctl
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are serialized to avoid deadlock.
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.Pp
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The state is described using a ``Management Information Base'' (MIB)
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style name, listed in
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.Fa name ,
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which is a
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.Fa namelen
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length array of integers.
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.Pp
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The information is copied into the buffer specified by
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.Fa oldp .
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The size of the buffer is given by the location specified by
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.Fa oldlenp
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before the call,
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and that location gives the amount of data copied after a successful call.
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If the amount of data available is greater
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than the size of the buffer supplied,
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the call supplies as much data as fits in the buffer provided
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and returns with the error code ENOMEM.
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If the old value is not desired,
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.Fa oldp
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and
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.Fa oldlenp
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should be set to NULL.
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.Pp
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The size of the available data can be determined by calling
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.Nm sysctl
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with a NULL parameter for
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.Fa oldp .
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The size of the available data will be returned in the location pointed to by
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.Fa oldlenp .
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For some operations, the amount of space may change often.
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For these operations,
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the system attempts to round up so that the returned size is
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large enough for a call to return the data shortly thereafter.
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.Pp
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To set a new value,
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.Fa newp
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is set to point to a buffer of length
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.Fa newlen
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from which the requested value is to be taken.
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If a new value is not to be set,
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.Fa newp
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should be set to NULL and
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.Fa newlen
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set to 0.
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.Pp
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The top level names are defined with a CTL_ prefix in
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.Pa <sys/sysctl.h> ,
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and are as follows.
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The next and subsequent levels down are found in the include files
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listed here, and described in separate sections below.
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.Pp
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.Bl -column CTLXMACHDEPXXX "Next level namesXXXXXX" -offset indent
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.It Sy Pa Name Next level names Description
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.It CTL\_DEBUG sys/sysctl.h Debugging
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.It CTL\_VFS sys/sysctl.h File system
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.It CTL\_HW sys/sysctl.h Generic CPU, I/O
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.It CTL\_KERN sys/sysctl.h High kernel limits
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.It CTL\_MACHDEP sys/sysctl.h Machine dependent
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.It CTL\_NET sys/socket.h Networking
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.It CTL\_USER sys/sysctl.h User-level
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.It CTL\_VM vm/vm_param.h Virtual memory
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.El
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.Pp
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For example, the following retrieves the maximum number of processes allowed
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in the system:
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.Bd -literal -offset indent -compact
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int mib[2], maxproc;
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size_t len;
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.sp
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mib[0] = CTL_KERN;
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mib[1] = KERN_MAXPROC;
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len = sizeof(maxproc);
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sysctl(mib, 2, &maxproc, &len, NULL, 0);
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.Ed
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.sp
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To retrieve the standard search path for the system utilities:
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.Bd -literal -offset indent -compact
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int mib[2];
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size_t len;
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char *p;
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.sp
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mib[0] = CTL_USER;
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mib[1] = USER_CS_PATH;
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sysctl(mib, 2, NULL, &len, NULL, 0);
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p = malloc(len);
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sysctl(mib, 2, p, &len, NULL, 0);
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.Ed
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.Sh CTL_DEBUG
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The debugging variables vary from system to system.
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A debugging variable may be added or deleted without need to recompile
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.Nm sysctl
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to know about it.
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Each time it runs,
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.Nm sysctl
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gets the list of debugging variables from the kernel and
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displays their current values.
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The system defines twenty
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.Ns ( Va struct ctldebug )
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variables named
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.Nm debug0
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through
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.Nm debug19 .
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They are declared as separate variables so that they can be
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individually initialized at the location of their associated variable.
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The loader prevents multiple use of the same variable by issuing errors
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if a variable is initialized in more than one place.
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For example, to export the variable
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.Nm dospecialcheck
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as a debugging variable, the following declaration would be used:
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.Bd -literal -offset indent -compact
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int dospecialcheck = 1;
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struct ctldebug debug5 = { "dospecialcheck", &dospecialcheck };
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.Ed
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.Sh CTL_VFS
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There are currently no second level names for the file system.
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.Sh CTL_HW
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The string and integer information available for the CTL_HW level
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is detailed below.
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The changeable column shows whether a process with appropriate
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privilege may change the value.
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.Bl -column "Second level nameXXXXXX" integerXXX -offset indent
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.It Sy Pa Second level name Type Changeable
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.It HW\_MACHINE string no
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.It HW\_MODEL string no
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.It HW\_NCPU integer no
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.It HW\_BYTEORDER integer no
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.It HW\_PHYSMEM integer no
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.It HW\_USERMEM integer no
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.It HW\_PAGESIZE integer no
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.\".It HW\_DISKNAMES integer no
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.\".It HW\_DISKSTATS integer no
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.El
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.Pp
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.Bl -tag -width "123456"
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.It Li HW_MACHINE
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The machine class.
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.It Li HW_MODEL
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The machine model
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.It Li HW_NCPU
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The number of cpus.
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.It Li HW_BYTEORDER
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The byteorder (4,321, or 1,234).
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.It Li HW_PHYSMEM
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The bytes of physical memory.
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.It Li HW_USERMEM
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The bytes of non-kernel memory.
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.It Li HW_PAGESIZE
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The software page size.
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.\".It Fa HW_DISKNAMES
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.\".It Fa HW_DISKSTATS
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.El
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.Sh CTL_KERN
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The string and integer information available for the CTL_KERN level
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is detailed below.
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The changeable column shows whether a process with appropriate
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privilege may change the value.
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The types of data currently available are process information,
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system vnodes, the open file entries, routing table entries,
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virtual memory statistics, load average history, and clock rate
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information.
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.Bl -column "KERNXCHOWNXRESTRICTEDXXX" "struct clockrateXXX" -offset indent
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.It Sy Pa Second level name Type Changeable
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.It KERN\_ARGMAX integer no
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.It KERN\_BOOTTIME struct timeval no
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.It KERN\_CHOWN\_RESTRICTED integer no
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.It KERN\_CLOCKRATE struct clockinfo no
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.It KERN\_FILE struct file no
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.It KERN\_HOSTID integer yes
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.It KERN\_HOSTNAME string yes
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.It KERN\_JOB\_CONTROL integer no
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.It KERN\_LINK\_MAX integer no
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.It KERN\_MAXFILES integer yes
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.It KERN\_MAXPROC integer yes
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.It KERN\_MAXVNODES integer yes
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.It KERN\_MAX\_CANON integer no
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.It KERN\_MAX\_INPUT integer no
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.It KERN\_NAME\_MAX integer no
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.It KERN\_NGROUPS integer no
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.It KERN\_NO\_TRUNC integer no
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.It KERN\_OSRELEASE string no
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.It KERN\_OSREV integer no
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.It KERN\_OSTYPE string no
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.It KERN\_PATH\_MAX integer no
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.It KERN\_PIPE\_BUF integer no
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.It KERN\_POSIX1 integer no
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.It KERN\_PROC struct proc no
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.It KERN\_PROF node not applicable
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.It KERN\_SAVED\_IDS integer no
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.It KERN\_SECURELVL integer raise only
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.It KERN\_VDISABLE integer no
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.It KERN\_VERSION string no
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.It KERN\_VNODE struct vnode no
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.El
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.Pp
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.Bl -tag -width "123456"
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.It Li KERN_ARGMAX
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The maximum bytes of argument to
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.Xr execve 2 .
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.It Li KERN_BOOTTIME
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A
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.Va struct timeval
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structure is returned.
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This structure contains the time that the system was booted.
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.It Li KERN_CHOWN_RESTRICTED
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Return 1 if appropriate privileges are required for the
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.Xr chown 2
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system call, otherwise 0.
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.It Li KERN_CLOCKRATE
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A
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.Va struct clockinfo
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structure is returned.
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This structure contains the clock, statistics clock and profiling clock
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frequencies, and the number of micro-seconds per hz tick.
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.It Li KERN_FILE
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Return the entire file table.
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The returned data consists of a single
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.Va struct filehead
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followed by an array of
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.Va struct file ,
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whose size depends on the current number of such objects in the system.
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.It Li KERN_HOSTID
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Get or set the host id.
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.It Li KERN_HOSTNAME
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Get or set the hostname.
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.It Li KERN_JOB_CONTROL
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Return 1 if job control is available on this system, otherwise 0.
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.It Li KERN_LINK_MAX
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The maximum file link count.
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.It Li KERN_MAXFILES
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The maximum number of open files that may be open in the system.
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.It Li KERN_MAXPROC
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The maximum number of simultaneous processes the system will allow.
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.It Li KERN_MAXVNODES
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The maximum number of vnodes available on the system.
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.It Li KERN_MAX_CANON
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The maximum number of bytes in terminal canonical input line.
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.It Li KERN_MAX_INPUT
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The minimum maximum number of bytes for which space is available in
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a terminal input queue.
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.It Li KERN_NAME_MAX
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The maximum number of bytes in a file name.
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.It Li KERN_NGROUPS
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The maximum number of supplemental groups.
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.It Li KERN_NO_TRUNC
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Return 1 if file names longer than KERN_NAME_MAX are truncated.
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.It Li KERN_OSRELEASE
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The system release string.
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.It Li KERN_OSREV
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The system revision string.
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.It Li KERN_OSTYPE
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The system type string.
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.It Li KERN_PATH_MAX
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The maximum number of bytes in a pathname.
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.It Li KERN_PIPE_BUF
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The maximum number of bytes which will be written atomically to a pipe.
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.It Li KERN_POSIX1
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The version of ISO/IEC 9945 (POSIX 1003.1) with which the system
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attempts to comply.
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.It Li KERN_PROC
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Return the entire process table, or a subset of it.
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An array of
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.Va struct kinfo_proc
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structures is returned,
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whose size depends on the current number of such objects in the system.
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The third and fourth level names are as follows:
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.Bl -column "Third level nameXXXXXX" "Fourth level is:XXXXXX" -offset indent
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.It Pa Third level name Fourth level is:
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.It KERN\_PROC\_ALL None
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.It KERN\_PROC\_PID A process ID
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.It KERN\_PROC\_PGRP A process group
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.It KERN\_PROC\_TTY A tty device
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.It KERN\_PROC\_UID A user ID
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.It KERN\_PROC\_RUID A real user ID
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.El
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.It Li KERN_PROF
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Return profiling information about the kernel.
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If the kernel is not compiled for profiling,
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attempts to retrieve any of the KERN_PROF values will
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fail with EOPNOTSUPP.
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The third level names for the string and integer profiling information
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is detailed below.
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The changeable column shows whether a process with appropriate
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privilege may change the value.
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.Bl -column "GPROFXGMONPARAMXXX" "struct gmonparamXXX" -offset indent
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.It Sy Pa Third level name Type Changeable
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.It GPROF\_STATE integer yes
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.It GPROF\_COUNT u_short[\|] yes
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.It GPROF\_FROMS u_short[\|] yes
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.It GPROF\_TOS struct tostruct yes
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.It GPROF\_GMONPARAM struct gmonparam no
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.El
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.Pp
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The variables are as follows:
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.Bl -tag -width "123456"
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.It Li GPROF_STATE
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Returns GMON_PROF_ON or GMON_PROF_OFF to show that profiling
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is running or stopped.
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.It Li GPROF_COUNT
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Array of statistical program counter counts.
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.It Li GPROF_FROMS
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Array indexed by program counter of call-from points.
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.It Li GPROF_TOS
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Array of
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.Va struct tostruct
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describing destination of calls and their counts.
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.It Li GPROF_GMONPARAM
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Structure giving the sizes of the above arrays.
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.El
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.It Li KERN_SAVED_IDS
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Returns 1 if saved set-group and saved set-user ID is available.
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.It Li KERN_SECURELVL
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The system security level.
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This level may be raised by processes with appropriate privilege.
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It may only be lowered by process 1.
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.It Li KERN_VDISABLE
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Returns the terminal character disabling value.
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.It Li KERN_VERSION
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The system version string.
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.It Li KERN_VNODE
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Return the entire vnode table.
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Note, the vnode table is not necessarily a consistent snapshot of
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the system.
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The returned data consists of an array whose size depends on the
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current number of such objects in the system.
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Each element of the array contains the kernel address of a vnode
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.Va struct vnode *
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followed by the vnode itself
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.Va struct vnode .
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.El
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.Sh CTL_MACHDEP
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The set of variables defined is architecture dependent.
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Most architectures define at least the following variables.
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.Bl -column "CONSOLE_DEVICEXXX" "integerXXX" -offset indent
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.It Sy Pa Second level name Type Changeable
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.It Li CPU_CONSDEV dev_t no
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.It Li CPU_ADJKERNTZ int yes
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.It Li CPU_DISRTCSET int yes
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.El
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.Sh CTL_NET
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The string and integer information available for the CTL_NET level
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is detailed below.
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The changeable column shows whether a process with appropriate
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privilege may change the value.
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.Bl -column "Second level nameXXXXXX" "routing messagesXXX" -offset indent
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.It Sy Pa Second level name Type Changeable
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.It PF\_ROUTE routing messages no
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.It PF\_INET internet values yes
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.El
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.Pp
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.Bl -tag -width "123456"
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.It Li PF_ROUTE
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Return the entire routing table or a subset of it.
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The data is returned as a sequence of routing messages (see
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.Xr route 4
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for the header file, format and meaning).
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The length of each message is contained in the message header.
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.Pp
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The third level name is a protocol number, which is currently always 0.
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The fourth level name is an address family, which may be set to 0 to
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select all address families.
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The fifth and sixth level names are as follows:
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.Bl -column "Fifth level nameXXXXXX" "Sixth level is:XXX" -offset indent
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.It Pa Fifth level name Sixth level is:
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.It NET\_RT\_FLAGS rtflags
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.It NET\_RT\_DUMP None
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.It NET\_RT\_IFLIST None
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.El
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.It Li PF_INET
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Get or set various global information about the internet protocols.
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The third level name is the protocol.
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The fourth level name is the variable name.
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The currently defined protocols and names are:
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.Bl -column "Protocol nameXXXXXX" "Variable nameXXX" "integerXXX" -offset indent
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.It Pa Protocol name Variable name Type Changeable
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.It ip forwarding integer yes
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.It ip redirect integer yes
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.It ip ttl integer yes
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.It icmp maskrepl integer yes
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.It udp checksum integer yes
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.El
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.Pp
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The variables are as follows:
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.Bl -tag -width "123456"
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.It Li ip.forwarding
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Returns 1 when IP forwarding is enabled for the host,
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meaning that the host is acting as a router.
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.It Li ip.redirect
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Returns 1 when ICMP redirects may be sent by the host.
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This option is ignored unless the host is routing IP packets,
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and should normally be enabled on all systems.
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.It Li ip.ttl
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The maximum time-to-live (hop count) value for an IP packet sourced by
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the system.
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This value applies to normal transport protocols, not to ICMP.
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.It Li icmp.maskrepl
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Returns 1 if ICMP network mask requests are to be answered.
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.It Li udp.checksum
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Returns 1 when UDP checksums are being computed and checked.
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Disabling UDP checksums is strongly discouraged.
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.El
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.Sh CTL_USER
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The string and integer information available for the CTL_USER level
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is detailed below.
|
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The changeable column shows whether a process with appropriate
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privilege may change the value.
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.Bl -column "USER_COLL_WEIGHTS_MAXXXX" "integerXXX" -offset indent
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.It Sy Pa Second level name Type Changeable
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.It USER\_BC\_BASE\_MAX integer no
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.It USER\_BC\_DIM\_MAX integer no
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.It USER\_BC\_SCALE\_MAX integer no
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.It USER\_BC\_STRING\_MAX integer no
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.It USER\_COLL\_WEIGHTS\_MAX integer no
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.It USER\_CS\_PATH string no
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.It USER\_EXPR\_NEST\_MAX integer no
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.It USER\_LINE\_MAX integer no
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.It USER\_POSIX2\_CHAR\_TERM integer no
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.It USER\_POSIX2\_C\_BIND integer no
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.It USER\_POSIX2\_C\_DEV integer no
|
|
.It USER\_POSIX2\_FORT\_DEV integer no
|
|
.It USER\_POSIX2\_FORT\_RUN integer no
|
|
.It USER\_POSIX2\_LOCALEDEF integer no
|
|
.It USER\_POSIX2\_SW\_DEV integer no
|
|
.It USER\_POSIX2\_UPE integer no
|
|
.It USER\_POSIX2\_VERSION integer no
|
|
.It USER\_RE\_DUP\_MAX integer no
|
|
.It USER\_STREAM\_MAX integer no
|
|
.It USER\_TZNAME\_MAX integer no
|
|
.El
|
|
.Bl -tag -width "123456"
|
|
.Pp
|
|
.It Li USER_BC_BASE_MAX
|
|
The maximum ibase/obase values in the
|
|
.Xr bc 1
|
|
utility.
|
|
.It Li USER_BC_DIM_MAX
|
|
The maximum array size in the
|
|
.Xr bc 1
|
|
utility.
|
|
.It Li USER_BC_SCALE_MAX
|
|
The maximum scale value in the
|
|
.Xr bc 1
|
|
utility.
|
|
.It Li USER_BC_STRING_MAX
|
|
The maximum string length in the
|
|
.Xr bc 1
|
|
utility.
|
|
.It Li USER_COLL_WEIGHTS_MAX
|
|
The maximum number of weights that can be assigned to any entry of
|
|
the LC_COLLATE order keyword in the locale definition file.
|
|
.It Li USER_CS_PATH
|
|
Return a value for the
|
|
.Ev PATH
|
|
environment variable that finds all the standard utilities.
|
|
.It Li USER_EXPR_NEST_MAX
|
|
The maximum number of expressions that can be nested within
|
|
parenthesis by the
|
|
.Xr expr 1
|
|
utility.
|
|
.It Li USER_LINE_MAX
|
|
The maximum length in bytes of a text-processing utility's input
|
|
line.
|
|
.It Li USER_POSIX2_CHAR_TERM
|
|
Return 1 if the system supports at least one terminal type capable of
|
|
all operations described in POSIX 1003.2, otherwise 0.
|
|
.It Li USER_POSIX2_C_BIND
|
|
Return 1 if the system's C-language development facilities support the
|
|
C-Language Bindings Option, otherwise 0.
|
|
.It Li USER_POSIX2_C_DEV
|
|
Return 1 if the system supports the C-Language Development Utilities Option,
|
|
otherwise 0.
|
|
.It Li USER_POSIX2_FORT_DEV
|
|
Return 1 if the system supports the FORTRAN Development Utilities Option,
|
|
otherwise 0.
|
|
.It Li USER_POSIX2_FORT_RUN
|
|
Return 1 if the system supports the FORTRAN Runtime Utilities Option,
|
|
otherwise 0.
|
|
.It Li USER_POSIX2_LOCALEDEF
|
|
Return 1 if the system supports the creation of locales, otherwise 0.
|
|
.It Li USER_POSIX2_SW_DEV
|
|
Return 1 if the system supports the Software Development Utilities Option,
|
|
otherwise 0.
|
|
.It Li USER_POSIX2_UPE
|
|
Return 1 if the system supports the User Portability Utilities Option,
|
|
otherwise 0.
|
|
.It Li USER_POSIX2_VERSION
|
|
The version of POSIX 1003.2 with which the system attempts to comply.
|
|
.It Li USER_RE_DUP_MAX
|
|
The maximum number of repeated occurrences of a regular expression
|
|
permitted when using interval notation.
|
|
.It Li USER_STREAM_MAX
|
|
The minimum maximum number of streams that a process may have open
|
|
at any one time.
|
|
.It Li USER_TZNAME_MAX
|
|
The minimum maximum number of types supported for the name of a
|
|
timezone.
|
|
.El
|
|
.Sh CTL_VM
|
|
The string and integer information available for the CTL_VM level
|
|
is detailed below.
|
|
The changeable column shows whether a process with appropriate
|
|
privilege may change the value.
|
|
.Bl -column "Second level nameXXXXXX" "struct loadavgXXX" -offset indent
|
|
.It Sy Pa Second level name Type Changeable
|
|
.It VM\_LOADAVG struct loadavg no
|
|
.It VM\_METER struct vmtotal no
|
|
.El
|
|
.Pp
|
|
.Bl -tag -width "123456"
|
|
.It Li VM_LOADAVG
|
|
Return the load average history.
|
|
The returned data consists of a
|
|
.Va struct loadavg .
|
|
.It Li VM_METER
|
|
Return the system wide virtual memory statistics.
|
|
The returned data consists of a
|
|
.Va struct vmtotal .
|
|
.El
|
|
.Sh RETURN VALUES
|
|
If the call to
|
|
.Nm sysctl
|
|
is successful, 0 is returned.
|
|
Otherwise \-1 is returned and
|
|
.Va errno
|
|
is set appropriately.
|
|
.Sh ERRORS
|
|
The following errors may be reported:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EFAULT
|
|
The buffer
|
|
.Fa name ,
|
|
.Fa oldp ,
|
|
.Fa newp ,
|
|
or length pointer
|
|
.Fa oldlenp
|
|
contains an invalid address.
|
|
.It Bq Er EINVAL
|
|
The
|
|
.Fa name
|
|
array is less than two or greater than CTL_MAXNAME.
|
|
.It Bq Er EINVAL
|
|
A non-null
|
|
.Fa newp
|
|
is given and its specified length in
|
|
.Fa newlen
|
|
is too large or too small.
|
|
.It Bq Er ENOMEM
|
|
The length pointed to by
|
|
.Fa oldlenp
|
|
is too short to hold the requested value.
|
|
.It Bq Er ENOTDIR
|
|
The
|
|
.Fa name
|
|
array specifies an intermediate rather than terminal name.
|
|
.It Bq Er EOPNOTSUPP
|
|
The
|
|
.Fa name
|
|
array specifies a value that is unknown.
|
|
.It Bq Er EPERM
|
|
An attempt is made to set a read-only value.
|
|
.It Bq Er EPERM
|
|
A process without appropriate privilege attempts to set a value.
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width <netinet/icmpXvar.h> -compact
|
|
.It Pa <sys/sysctl.h>
|
|
definitions for top level identifiers, second level kernel and hardware
|
|
identifiers, and user level identifiers
|
|
.It Pa <sys/socket.h>
|
|
definitions for second level network identifiers
|
|
.It Pa <sys/gmon.h>
|
|
definitions for third level profiling identifiers
|
|
.It Pa <vm/vm_param.h>
|
|
definitions for second level virtual memory identifiers
|
|
.It Pa <netinet/in.h>
|
|
definitions for third level Internet identifiers and
|
|
fourth level IP identifiers
|
|
.It Pa <netinet/icmp_var.h>
|
|
definitions for fourth level ICMP identifiers
|
|
.It Pa <netinet/udp_var.h>
|
|
definitions for fourth level UDP identifiers
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr sysctl 8
|
|
.Sh HISTORY
|
|
The
|
|
.Nm sysctl
|
|
function first appeared in 4.4BSD.
|