e1f4e80c88
in the main text of various man pages. Thanks to Warner Losh for adding an option to manck to allow it to scan the entire man page looking for bogus xrefs, instead of just checking the SEE ALSO section.
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\_FS 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_FS
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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
|
|
is detailed below.
|
|
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
|
|
.Bl -tag -width "123456"
|
|
.It Li PF_ROUTE
|
|
Return the entire routing table or a subset of it.
|
|
The data is returned as a sequence of routing messages (see
|
|
.Xr route 4
|
|
for the header file, format and meaning).
|
|
The length of each message is contained in the message header.
|
|
.Pp
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|
The third level name is a protocol number, which is currently always 0.
|
|
The fourth level name is an address family, which may be set to 0 to
|
|
select all address families.
|
|
The fifth and sixth level names are as follows:
|
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.Bl -column "Fifth level nameXXXXXX" "Sixth level is:XXX" -offset indent
|
|
.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
|
|
Get or set various global information about the internet protocols.
|
|
The third level name is the protocol.
|
|
The fourth level name is the variable name.
|
|
The currently defined protocols and names are:
|
|
.Bl -column "Protocol nameXXXXXX" "Variable nameXXX" "integerXXX" -offset indent
|
|
.It Pa Protocol name Variable name Type Changeable
|
|
.It ip forwarding integer yes
|
|
.It ip redirect integer yes
|
|
.It ip ttl integer yes
|
|
.It icmp maskrepl integer yes
|
|
.It udp checksum integer yes
|
|
.El
|
|
.Pp
|
|
The variables are as follows:
|
|
.Bl -tag -width "123456"
|
|
.It Li ip.forwarding
|
|
Returns 1 when IP forwarding is enabled for the host,
|
|
meaning that the host is acting as a router.
|
|
.It Li ip.redirect
|
|
Returns 1 when ICMP redirects may be sent by the host.
|
|
This option is ignored unless the host is routing IP packets,
|
|
and should normally be enabled on all systems.
|
|
.It Li ip.ttl
|
|
The maximum time-to-live (hop count) value for an IP packet sourced by
|
|
the system.
|
|
This value applies to normal transport protocols, not to ICMP.
|
|
.It Li icmp.maskrepl
|
|
Returns 1 if ICMP network mask requests are to be answered.
|
|
.It Li udp.checksum
|
|
Returns 1 when UDP checksums are being computed and checked.
|
|
Disabling UDP checksums is strongly discouraged.
|
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.El
|
|
.Sh CTL_USER
|
|
The string and integer information available for the CTL_USER level
|
|
is detailed below.
|
|
The changeable column shows whether a process with appropriate
|
|
privilege may change the value.
|
|
.Bl -column "USER_COLL_WEIGHTS_MAXXXX" "integerXXX" -offset indent
|
|
.It Sy Pa Second level name Type Changeable
|
|
.It USER\_BC\_BASE\_MAX integer no
|
|
.It USER\_BC\_DIM\_MAX integer no
|
|
.It USER\_BC\_SCALE\_MAX integer no
|
|
.It USER\_BC\_STRING\_MAX integer no
|
|
.It USER\_COLL\_WEIGHTS\_MAX integer no
|
|
.It USER\_CS\_PATH string no
|
|
.It USER\_EXPR\_NEST\_MAX integer no
|
|
.It USER\_LINE\_MAX integer no
|
|
.It USER\_POSIX2\_CHAR\_TERM integer no
|
|
.It USER\_POSIX2\_C\_BIND integer no
|
|
.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.
|