f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
301 lines
7.1 KiB
Groff
301 lines
7.1 KiB
Groff
.\" $NetBSD: modctl.2,v 1.9 2012/08/07 01:19:05 jnemeth Exp $
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.\"
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.\" Copyright (c) 2009 The NetBSD Foundation, Inc.
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.\" 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd August 3, 2012
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.Dt MODCTL 2
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.Os
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.Sh NAME
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.Nm modctl
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.Nd module control
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/module.h
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.Ft int
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.Fn modctl "int operation" "void *argp"
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.Sh DESCRIPTION
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.Fn modctl
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provides control over loaded kernel modules.
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The argument
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.Fa operation
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is one of
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.Dv MODCTL_LOAD ,
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.Dv MODCTL_UNLOAD ,
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.Dv MODCTL_STAT ,
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or
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.Dv MODCTL_EXISTS .
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The argument
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.Fa argp
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depends on the
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.Fa operation
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to be performed.
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.Pp
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Operations are:
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.Bl -tag -width MODCTL_UNLOAD
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.It Dv MODCTL_LOAD
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Load a module.
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The
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.Fa argp
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argument should be a pointer to a
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.Em modctl_load_t
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structure, described below.
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.It Dv MODCTL_UNLOAD
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Unload a module.
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In this case,
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.Fa argp
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should be a string containing the name of the module to be unloaded.
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.It Dv MODCTL_STAT
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Return a list of loaded modules.
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In this case, the
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.Fa argp
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argument should be a
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.Em struct iovec
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pointing to a suitable block of memory.
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The kernel will fill this block with an array of
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.Em modstat_t
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structures, one per loaded module.
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If the block is not large enough, the data returned will be truncated
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to fit.
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The kernel will then update the
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.Fa iov_len
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member of the
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.Em iovec
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to reflect the size of the complete report, regardless of whether this
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is larger or smaller than the size passed in.
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.It Dv MODCTL_EXISTS
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Test to see if the kernel was compiled with
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.Dq options MODULAR
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and whether or
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not modules may be loaded at the moment.
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In this case,
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.Fa argp
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should be an integer.
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It should be
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.Dq 0
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to test if a user can load a module via
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.Dv MODCTL_LOAD ,
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or it should be
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.Dq 1
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to test if the system can autoload modules.
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Note that this
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test does not consider the sysctl
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.Li kern.module.autoload .
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.El
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.Ss Data Types
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The
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.Em modctl_load_t
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structure used with
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.Dv MODCTL_LOAD
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contains the following elements, which should be filled in by the caller:
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.Bl -tag -width aaaaaaaa
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.It Fa "const char *ml_filename"
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The name/path of the module to load.
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.It Fa "int ml_flags"
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Zero or more of the following flag values:
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.Bl -tag -compact -width "MODCTL_LOAD_FORCE"
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.It Dv MODCTL_NO_PROP
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Don't load
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.Ao module Ac Ns Pa .plist .
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.It Dv MODCTL_LOAD_FORCE
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Ignore kernel version mismatch.
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.El
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.It Fa "const char *ml_props"
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Externalized proplib dictionary to pass to module.
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.It Fa "size_t ml_propslen"
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Size of the dictionary blob.
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.Fa ml_props
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may be
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.Dv NULL
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in which case
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.Fa ml_propslen
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must be
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.Dv 0 .
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.El
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.Pp
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The
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.Em modstat_t
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structure used with
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.Dv MODCTL_STAT
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contains the following elements, which are filled in by the kernel:
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.Bl -tag -width aaaaaaaa
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.It Fa "char ms_name[MAXMODNAME]"
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The name of the module.
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.It Fa "char ms_required[MAXMODNAME * MAXMODDEPS]"
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The list of modules required by this module
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as a comma-delimited list of module names.
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.It Fa "modsrc_t ms_source"
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One of the following enumerated constants:
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.Bl -tag -compact -width "MODULE_SOURCE_FILESYS"
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.It Dv MODULE_SOURCE_KERNEL
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The module is compiled into the kernel.
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.It Dv MODULE_SOURCE_BOOT
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The module was provided by the bootstrap loader.
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.It Dv MODULE_SOURCE_FILESYS
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The module was loaded from the file system.
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.El
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.It Fa "modclass_t ms_class"
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One of the following enumerated constants:
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.Bl -tag -compact -width "MODULE_SOURCE_FILESYS"
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.It Dv MODULE_CLASS_SECMODEL
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Security model.
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.It Dv MODULE_CLASS_VFS
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File system.
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.It Dv MODULE_CLASS_DRIVER
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Device driver.
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.It Dv MODULE_CLASS_EXEC
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Executable file format.
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.It Dv MODULE_CLASS_MISC
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Miscellaneous.
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.It Dv MODULE_CLASS_ANY
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Any module class.
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.\" XXX: is MODULE_CLASS_ANY ever returned by this interface?
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.El
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.It Fa "uint64_t ms_addr"
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The load address within the kernel.
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.It Fa "u_int ms_size"
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Loaded size of the module.
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.It Fa "u_int ms_refcnt"
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Current number of live references to this module.
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.El
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.Sh RETURN VALUES
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Upon successful completion, the value returned is 0.
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.Pp
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Otherwise, a value of \-1 is returned and
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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.Fn modctl
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will fail if:
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.Bl -tag -width Er
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.It Bq Er EBUSY
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The argument
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.Fa operation
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is
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.Dv MODCTL_UNLOAD
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and the module is in use or the module is compiled into the kernel.
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.It Bq Er EDEADLK
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The argument
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.Fa operation
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is
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.Dv MODCTL_LOAD
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and there is a circular dependency in the module's dependency chain.
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.It Bq Er EEXIST
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The argument
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.Fa operation
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is
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.Dv MODCTL_LOAD
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and the module is already loaded.
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.It Bq Er EFAULT
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A bad address was given for
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.Fa argp .
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.It Bq Er EFBIG
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The argument
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.Fa operation
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is
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.Dv MODCTL_LOAD ,
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the specified module resides in the file system, and the module's default
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proplib file was too large.
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.It Bq Er EINVAL
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The argument
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.Fa operation
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is invalid.
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.Pp
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The argument
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.Fa operation
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is
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.Dv MODCTL_LOAD
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and ml_props is not
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.Dv NULL
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and
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.Dq ml_propslen
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is
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.Dv 0 ,
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or
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ml_props is
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.Dv NULL
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and
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.Dq ml_propslen
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is not
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.Dv 0 .
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The kernel is unable to internalize the plist.
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Or, there is a problem with the module or \*[Lt]module\*[Gt].plist.
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.It Bq Er EMLINK
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The argument
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.Fa operation
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is
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.Dv MODCTL_LOAD
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and the module has too many dependencies.
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.It Bq Er ENAMETOOLONG
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A module name/path is too long.
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.It Bq Er ENOENT
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The argument
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.Fa operation
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is
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.Dv MODCTL_LOAD
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and the module or a dependency can't be found.
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The argument
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.Fa operation
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is
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.Dv MODCTL_UNLOAD
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and no module by the name of
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.Fa argp
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is loaded.
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.It Bq Er ENOEXEC
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The argument
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.Fa operation
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is
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.Dv MODCTL_LOAD
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and the module is not a valid object for the system.
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.It Bq Er ENOMEM
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There was not enough memory to perform the
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.Fa operation .
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.It Bq Er EPERM
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Not allowed to perform the
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.Fa operation .
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.It Bq Er EPROGMISMATCH
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The argument
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.Fa operation
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is
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.Dv MODCTL_LOAD ,
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the
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.Fa ml_flags
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field in the
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.Em modctl_load_t
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structure does not include
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.Dv MODCTL_LOAD_FORCE ,
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and the requested module does not match the current kernel's version
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information.
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.El
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.Sh SEE ALSO
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.Xr module 7 ,
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.Xr sysctl 7 ,
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.Xr module 9
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.Sh HISTORY
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The
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.Fn modctl
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function call first appeared in
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.Nx 5.0 .
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