1 .\" Copyright (c) 1999 Chris Costello
2 .\" All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
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13 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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15 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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20 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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25 .\" $FreeBSD: src/share/man/man9/make_dev.9,v 1.2.2.3 2001/12/17 11:30:18 ru Exp $
26 .\" $DragonFly: src/share/man/man9/make_dev.9,v 1.3 2006/05/26 19:39:40 swildner Exp $
33 .Nm destroy_only_dev ,
34 .Nm devfs_scan_callback ,
35 .Nm dev_ops_intercept ,
36 .Nm dev_ops_remove_all ,
37 .Nm dev_ops_remove_minor ,
44 .Nd "device entry manipulation functions"
49 .Fn destroy_dev "cdev_t dev"
51 .Fn destroy_only_dev "cdev_t dev"
53 .Fn devfs_scan_callback "devfs_scan_t *callback"
55 .Fn dev_ops_intercept "cdev_t dev" "struct dev_ops *iops"
57 .Fn dev_ops_remove_all "struct dev_ops *ops"
59 .Fn dev_ops_restore "cdev_t dev" "struct dev_ops *oops"
61 .Fn dev_ops_remove_minor "struct dev_ops *ops" "int minor"
63 .Fn make_dev "struct dev_ops *ops" "int minor" "uid_t uid" "gid_t gid" "int perms" "char *fmt" ...
65 .Fn make_dev_alias "cdev_t target" "const char *fmt" ...
67 .Fn make_only_dev "struct dev_ops *ops" "int minor" "uid_t uid" "gid_t gid" "int perms" "const char *fmt" ...
69 .Fn reference_dev "cdev_t dev"
71 .Fn release_dev "cdev_t dev"
77 structure for a new device and makes the device name visible in the
80 The device's name must be unique.
81 The name is the expansion of
83 and following arguments as
86 The name determines its path under
88 The permissions of the file specified in
93 .Bd -literal -offset indent -compact
94 #define S_IRWXU 0000700 /* RWX mask for owner */
95 #define S_IRUSR 0000400 /* R for owner */
96 #define S_IWUSR 0000200 /* W for owner */
97 #define S_IXUSR 0000100 /* X for owner */
99 #define S_IRWXG 0000070 /* RWX mask for group */
100 #define S_IRGRP 0000040 /* R for group */
101 #define S_IWGRP 0000020 /* W for group */
102 #define S_IXGRP 0000010 /* X for group */
104 #define S_IRWXO 0000007 /* RWX mask for other */
105 #define S_IROTH 0000004 /* R for other */
106 #define S_IWOTH 0000002 /* W for other */
107 #define S_IXOTH 0000001 /* X for other */
109 #define S_ISUID 0004000 /* set user id on execution */
110 #define S_ISGID 0002000 /* set group id on execution */
111 #define S_ISVTX 0001000 /* sticky bit */
112 #ifndef _POSIX_SOURCE
113 #define S_ISTXT 0001000
119 argument is a pointer to a
121 data structure, which is defined as follows:
125 const char *name; /* base name, e.g. 'da' */
126 int maj; /* major device number */
127 u_int flags; /* D_XXX flags */
128 void *data; /* custom driver data */
129 int refs; /* ref count */
133 #define dev_ops_first_field d_default
134 d_default_t *d_default;
142 d_strategy_t *d_strategy;
145 d_kqfilter_t *d_kqfilter;
146 d_clone_t *d_clone; /* clone from base dev_ops */
147 d_revoke_t *d_revoke;
148 #define dev_ops_last_field d_revoke
152 While one can and should initialize the
156 fields, they are effectively ignored.
157 Device major numbers are assigned automatically out of an internal pool of
158 major numbers, so there is no need to specify a unique major number in the
164 family is defined as:
166 typedef int d_xxx_t (struct dev_xxx_args *ap);
169 Therefore, if one wants to implement a
171 function, this is the way:
176 mydev_open(struct dev_open_args *ap)
184 structure and initializes it the same way
186 would, but the device will not appear in the
195 and destroys the registration for that device.
196 It should not be used to destroy a
206 and destroys the registration for that device.
207 It should not be used to destroy a
215 link (alias) with the given name to the
221 must have been created either by
223 or bt a clone handler.
224 Aliases are alternative names for devices in the
227 The lifetime of an alias is that of its associated
231 is removed or destroyed, the alias is also destroyed and its name is
239 Callers generally add their own references when they are going to store a device
240 node in a variable for long periods of time, to prevent a disassociation from
244 releases a reference on
246 The device will be terminated when the last reference has been released.
248 .Fn dev_ops_intercept
249 intercepts the device operations vector of
255 is returned which may be used in a subsequent
258 The function sets the
264 restores the device operations vector of
273 .Fn dev_ops_remove_all
278 and removes the devices from the
281 This function is useful when uninitializing a driver.
283 .Fn dev_ops_remove_minor
290 and removes the devices from the
294 .Fn devfs_scan_callback
297 function for every device registered in
301 function has the following form:
303 devfs_scan_t mydev_scan_callback;
306 mydev_scan_callback(cdev_t dev)
315 functions first appeared in
318 A major overhaul of these functions occured in DragonFly 2.3 with the addition