From 2c8ac1b3124db9131c35548de12a5e855656e502 Mon Sep 17 00:00:00 2001 From: Sascha Wildner Date: Mon, 7 Sep 2009 16:56:21 +0200 Subject: [PATCH] Add the make_autoclone_dev(9) manual page. Submitted-by: alexh --- share/man/man9/Makefile | 12 ++ share/man/man9/make_autoclone_dev.9 | 249 ++++++++++++++++++++++++++++++++++++ 2 files changed, 261 insertions(+) create mode 100644 share/man/man9/make_autoclone_dev.9 diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile index b645845..e917fe5 100644 --- a/share/man/man9/Makefile +++ b/share/man/man9/Makefile @@ -99,6 +99,7 @@ MAN= accept_filter.9 \ ksignal.9 \ ktr.9 \ lock.9 \ + make_autoclone_dev.9 \ make_dev.9 \ mbuf.9 \ MD5.9 \ @@ -469,6 +470,17 @@ MLINKS+=lock.9 lockcount.9 \ lock.9 lockmgr.9 \ lock.9 lockmgr_printinfo.9 \ lock.9 lockstatus.9 +MLINKS+=make_autoclone_dev.9 destroy_autoclone_dev.9 \ + make_autoclone_dev.9 DEVFS_CLONE_BITMAP.9 \ + make_autoclone_dev.9 devfs_clone_bitmap_chk.9 \ + make_autoclone_dev.9 devfs_clone_bitmap_fff.9 \ + make_autoclone_dev.9 devfs_clone_bitmap_get.9 \ + make_autoclone_dev.9 devfs_clone_bitmap_init.9 \ + make_autoclone_dev.9 devfs_clone_bitmap_put.9 \ + make_autoclone_dev.9 devfs_clone_bitmap_rst.9 \ + make_autoclone_dev.9 devfs_clone_bitmap_set.9 \ + make_autoclone_dev.9 devfs_clone_bitmap_uninit.9 \ + make_autoclone_dev.9 DEVFS_DECLARE_CLONE_BITMAP.9 MLINKS+=make_dev.9 destroy_dev.9 \ make_dev.9 destroy_only_dev.9 \ make_dev.9 devfs_scan_callback.9 \ diff --git a/share/man/man9/make_autoclone_dev.9 b/share/man/man9/make_autoclone_dev.9 new file mode 100644 index 0000000..4c802fa --- /dev/null +++ b/share/man/man9/make_autoclone_dev.9 @@ -0,0 +1,249 @@ +.\" +.\" Copyright (c) 2009 +.\" The DragonFly Project. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in +.\" the documentation and/or other materials provided with the +.\" distribution. +.\" 3. Neither the name of The DragonFly Project nor the names of its +.\" contributors may be used to endorse or promote products derived +.\" from this software without specific, prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS +.\" FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +.\" COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, +.\" INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, +.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED +.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, +.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT +.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.Dd September 7, 2009 +.Os +.Dt MAKE_AUTOCLONE_DEV 9 +.Sh NAME +.Nm make_autoclone_dev , +.Nm destroy_autoclone_dev , +.Nm devfs_clone_bitmap_init , +.Nm devfs_clone_bitmap_uninit , +.Nm devfs_clone_bitmap_fff , +.Nm devfs_clone_bitmap_chk , +.Nm devfs_clone_bitmap_set , +.Nm devfs_clone_bitmap_rst , +.Nm devfs_clone_bitmap_get , +.Nm devfs_clone_bitmap_put , +.Nm DEVFS_DECLARE_CLONE_BITMAP , +.Nm DEVFS_CLONE_BITMAP +.Nd device clone functions +.Sh SYNOPSIS +.In sys/types.h +.In sys/conf.h +.In sys/devfs.h +.Ft cdev_t +.Fn make_autoclone_dev "struct dev_ops *ops" "struct devfs_bitmap *bitmap" "d_clone_t *nhandler" "uid_t uid" "gid_t gid" "int perms" "const char *fmt" ... +.Ft void +.Fn destroy_autoclone_dev "cdev_t dev" "struct devfs_bitmap *bitmap" +.Ft void +.Fn devfs_clone_bitmap_init "struct devfs_bitmap *bitmap" +.Ft void +.Fn devfs_clone_bitmap_uninit "struct devfs_bitmap *bitmap" +.Ft void +.Fn devfs_clone_bitmap_fff "struct devfs_bitmap *bitmap" +.Ft int +.Fn devfs_clone_bitmap_chk "struct devfs_bitmap *bitmap, int unit" +.Ft void +.Fn devfs_clone_bitmap_set "struct devfs_bitmap *bitmap, int unit" +.Ft void +.Fn devfs_clone_bitmap_rst "struct devfs_bitmap *bitmap, int unit" +.Ft int +.Fn devfs_clone_bitmap_get "struct devfs_bitmap *bitmap, int limit" +.Ft void +.Fn devfs_clone_bitmap_put "struct devfs_bitmap *bitmap, int unit" +.Fn DEVFS_DECLARE_CLONE_BITMAP "name" +.Fn DEVFS_CLONE_BITMAP "name" +.Sh DESCRIPTION +.Fn make_autoclone_dev +creates a +.Vt cdev_t +with the default +.Fa ops , +visible in the +.Xr devfs 5 +namespace, that (when opened) will invoke the clone handler specified by +.Fa nhandler . +If a +.Vt devfs_bitmap * +is specified, the given +.Fa bitmap +is initialized using +.Fn devfs_clone_bitmap_init . +.Pp +The clone handler must be defined as follows: +.Bd -literal +d_clone_t mydev_clone; + +int +mydev_clone(struct dev_clone_args *ap) +{ +}; +.Ed +.Pp +When called, the handler is passed a pointer to a populated +.Vt dev_clone_args +structure, which is defined as follows: +.Bd -literal +struct dev_clone_args { + struct dev_generic_args a_head; + struct cdev *a_dev; + const char *a_name; + size_t a_namelen; + struct ucred *a_cred; + int a_mode; +}; +.Ed +.Pp +.Fa a_head.a_dev +is the +.Vt cdev_t +of the accessed autoclone device. +.Fa a_name +and +.Fa a_namelen +are the registered clonable base name and its length, as specified to +.Fn make_autoclone_dev . +.Fa a_mode +and +.Fa a_cred +contain the mode and cred passed to the autoclone device's +.Fn open . +.Pp +The clone handler must set +.Fa a_dev +to a new +.Vt cdev_t , +returned by a call to +.Fn make_only_dev . +.Fa a_dev +may also be set to +.Dv NULL , +in which case the +.Fn open +will ultimately fail with +.Er ENXIO . +If +.Fa a_dev +is +.Pf non- Ns Dv NULL , +it is automatically made visible and linked into +.Xr devfs 5 +as if it was created with +.Fn make_dev . +Thus, +.Fn destroy_dev +should be used to destroy the cloned +.Vt cdev_t +once it is no longer required, +usually during +.Fn close . +.Pp +.Fn destroy_autoclone_dev +destroys a +.Vt cdev_t +created by +.Fn make_autoclone_dev +unregistering its clone handler and (if non-NULL) also uninitializes its +.Fa bitmap +using +.Fn devfs_clone_bitmap_uninit . +.Pp +.Fn devfs_clone_bitmap_init +initializes the given clone +.Fa bitmap +so it is ready to use. +.Pp +.Fn devfs_clone_bitmap_uninit +frees the memory associated with the specified clone +.Fa bitmap +and leaves it unusable. +.Pp +.Fn devfs_clone_bitmap_fff +returns the first unused unit in +.Fa bitmap . +To use this unit, it has to be acquired by a call to +.Fn devfs_clone_bitmap_set . +.Pp +.Fn devfs_clone_bitmap_chk +checks if +.Fa unit +is in use (set) and returns 1 if it is; otherwise 0 is returned. +.Pp +.Fn devfs_clone_bitmap_set +marks +.Fa unit +in +.Fa bitmap +as used, so further calls to +.Fn devfs_clone_bitmap_fff +or +.Fn devfs_clone_bitmap_get +cannot retrieve it. +If one intends to use a clone handler along with preallocated devices, it +is recommended to block the unit numbers of the preallocated devices by +calling +.Fn devfs_clone_bitmap_set +on them. +.Pp +.Fn devfs_clone_bitmap_rst +marks +.Fa unit +in the +.Fa bitmap +as unused so further calls to +.Fn devfs_clone_bitmap_fff +or +.Fn devfs_clone_bitmap_get +can retrieve it again. +.Fn devfs_clone_bitmap_put +is an alias for +.Fn devfs_clone_bitmap_rst . +.Pp +.Fn devfs_clone_bitmap_get +is a shortcut to +.Fn devfs_clone_bitmap_fff +and +.Fn devfs_clone_bitmap_set . +It will return the first unused unit number and also mark it as used. +.Pp +The +.Fn DEVFS_DECLARE_CLONE_BITMAP +macro declares a clone bitmap with the specified +.Fa name . +As long as the name specified is unique, this macro can be used to declare +global variables. +.Pp +The +.Fn DEVFS_CLONE_BITMAP +is a macro which expands the specified +.Fa name +to the full name of a clone bitmap. +It is used in conjunction with +.Fn DEVFS_DECLARE_CLONE_BITMAP , +as it uses the same name. +.Sh HISTORY +The +.Xr devfs 5 +clone facilities and the associated functions all appeared in +.Dx 2.3 . +.Sh AUTHOR +.An Alex Hornung -- 2.8.1