137 lines
3.9 KiB
Groff
137 lines
3.9 KiB
Groff
.\" Copyright (c) 1999 Chris Costello
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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 AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.Dd May 27, 2001
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.Os
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.Dt MAKE_DEV 9
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.Sh NAME
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.Nm make_dev ,
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.Nm make_dev_alias ,
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.Nm destroy_dev ,
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.Nm depends_dev
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.Nd manage dev_t's and DEVFS registration for devices
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <sys/conf.h>
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.Ft dev_t
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.Fn make_dev "struct cdevsw *cdevsw" "int minor" "uid_t uid" "gid_t gid" "int perms" "char *fmt" ...
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.Ft dev_t
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.Fn make_dev_alias "dev_t pdev" "char *fmt" ...
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.Ft void
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.Fn destroy_dev "dev_t dev"
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.Ft void
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.Fn dev_depends "dev_t pdev" "dev_t cdev"
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.Sh DESCRIPTION
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The
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.Fn make_dev
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function creates a
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.Fa dev_t
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structure for a new device. If DEVFS is available, it is also notified of
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the presence of the new device. The device will be owned by
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.Va uid ,
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with the group ownership as
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.Va gid ,
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and with the name as specified in
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.Va name .
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The permissions of the file specified in
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.Va perms
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are defined in
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.Aq Pa sys/stat.h :
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.Pp
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.Bd -literal -offset indent -compact
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#define S_IRWXU 0000700 /* RWX mask for owner */
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#define S_IRUSR 0000400 /* R for owner */
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#define S_IWUSR 0000200 /* W for owner */
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#define S_IXUSR 0000100 /* X for owner */
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#define S_IRWXG 0000070 /* RWX mask for group */
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#define S_IRGRP 0000040 /* R for group */
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#define S_IWGRP 0000020 /* W for group */
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#define S_IXGRP 0000010 /* X for group */
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#define S_IRWXO 0000007 /* RWX mask for other */
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#define S_IROTH 0000004 /* R for other */
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#define S_IWOTH 0000002 /* W for other */
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#define S_IXOTH 0000001 /* X for other */
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#define S_ISUID 0004000 /* set user id on execution */
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#define S_ISGID 0002000 /* set group id on execution */
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#define S_ISVTX 0001000 /* sticky bit */
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#ifndef _POSIX_SOURCE
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#define S_ISTXT 0001000
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#endif
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.Ed
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.Pp
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The
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.Fn make_dev_alias
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function takes the returned
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.Ft dev_t
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from
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.Fn make_dev
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and makes another (aliased) name for this device.
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It is an error to call
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.Fn make_dev_alias
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prior to calling
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.Fn make_dev .
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.Pp
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The
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.Fn destroy_dev
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function takes the returned
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.Fa dev_t
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from
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.Fn make_dev
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and destroys the registration for that device.
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Do not call
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.Fn destroy_dev
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on devices that were created with
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.Fn make_dev_alias .
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.Pp
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The
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.Fn depends_dev
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function establishes a parent-child relationship between two devices.
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The net effect is that a
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.Fn destroy_dev
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of the parent device will also result in the destruction of the
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child device(s),
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if any exist.
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A device may simultaneously be a parent and a child,
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so it is possible to build a complete hierachy.
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.Sh HISTORY
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The
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.Fn make_dev
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and
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.Fn destroy_dev
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functions first appeared in
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.Fx 4.0 .
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The function
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.Fn make_dev_alias
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first appeared in
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.Fx 4.1 .
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The function
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.Fn depends_dev
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first appeared in
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.Fx 5.0 .
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