1 .\" Copyright (c) 1999 Chris Costello
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36 .Nm destroy_dev_sched ,
37 .Nm destroy_dev_sched_cb ,
38 .Nm destroy_dev_drain ,
42 and DEVFS registration for devices
47 .Fn make_dev "struct cdevsw *cdevsw" "int unit" "uid_t uid" "gid_t gid" "int perms" "const char *fmt" ...
49 .Fn make_dev_cred "struct cdevsw *cdevsw" "int unit" "struct ucred *cr" "uid_t uid" "gid_t gid" "int perms" "const char *fmt" ...
51 .Fn make_dev_credf "int flags" "struct cdevsw *cdevsw" "int unit" "struct ucred *cr" "uid_t uid" "gid_t gid" "int perms" "const char *fmt" ...
53 .Fn make_dev_alias "struct cdev *pdev" "const char *fmt" ...
55 .Fn destroy_dev "struct cdev *dev"
57 .Fn destroy_dev_sched "struct cdev *dev"
59 .Fn destroy_dev_sched_cb "struct cdev *dev" "void (*cb)(void *)" "void *arg"
61 .Fn destroy_dev_drain "struct cdevsw *csw"
63 .Fn dev_depends "struct cdev *pdev" "struct cdev *cdev"
69 structure for a new device.
72 of the presence of the new device, that causes corresponding nodes
77 The device will be owned by
79 with the group ownership as
81 The name is the expansion of
83 and following arguments as
86 The name determines its path under
90 mount point and may contain slash
92 characters to denote subdirectories.
93 The permissions of the file specified in
98 .Bd -literal -offset indent -compact
99 #define S_IRWXU 0000700 /* RWX mask for owner */
100 #define S_IRUSR 0000400 /* R for owner */
101 #define S_IWUSR 0000200 /* W for owner */
102 #define S_IXUSR 0000100 /* X for owner */
104 #define S_IRWXG 0000070 /* RWX mask for group */
105 #define S_IRGRP 0000040 /* R for group */
106 #define S_IWGRP 0000020 /* W for group */
107 #define S_IXGRP 0000010 /* X for group */
109 #define S_IRWXO 0000007 /* RWX mask for other */
110 #define S_IROTH 0000004 /* R for other */
111 #define S_IWOTH 0000002 /* W for other */
112 #define S_IXOTH 0000001 /* X for other */
114 #define S_ISUID 0004000 /* set user id on execution */
115 #define S_ISGID 0002000 /* set group id on execution */
116 #define S_ISVTX 0001000 /* sticky bit */
117 #ifndef _POSIX_SOURCE
118 #define S_ISTXT 0001000
124 argument specifies credentials that will be stored in the
126 member of the initialized
130 argument alters the operation of
132 The following values are currently accepted:
134 .Bd -literal -offset indent -compact
135 MAKEDEV_REF reference the created device
136 MAKEDEV_NOWAIT do not sleep, may return NULL
137 MAKEDEV_WAITOK allow the function to sleep to satisfy malloc
142 flag is assumed if none of
149 event handler shall specify
151 flag when creating a device in response to lookup, to avoid race where
152 the device created is destroyed immediately after
154 drops his reference to cdev.
158 function is equivalent to the call
159 .Bd -literal -offset indent
160 make_dev_credf(0, cdevsw, unit, cr, uid, gid, perms, fmt, ...);
165 function call is the same as
166 .Bd -literal -offset indent
167 make_dev_credf(0, cdevsw, unit, NULL, uid, gid, perms, fmt, ...);
172 function takes the returned
176 and makes another (aliased) name for this device.
177 It is an error to call
192 that are available to store state.
193 Both fields are of type
195 These are designed to replace the
199 which can be obtained with
204 function takes the returned
208 and destroys the registration for that device.
209 The notification is sent to
211 about the destruction event.
214 on devices that were created with
219 function establishes a parent-child relationship between two devices.
220 The net effect is that a
222 of the parent device will also result in the destruction of the
225 A device may simultaneously be a parent and a child,
226 so it is possible to build a complete hierarchy.
229 .Fn destroy_dev_sched_cb
230 function schedules execution of the
237 is finished, and if the supplied
239 is not NULL, the callback
241 is called, with argument
244 .Fn destroy_dev_sched
245 function is the same as
246 .Bd -literal -offset indent
247 destroy_dev_sched(cdev, NULL, NULL);
252 driver method cannot call
254 directly. Doing so causes deadlock when
256 waits for all threads to leave the driver methods.
259 sleeps, no non-sleepable locks may be held over the call.
261 .Fn destroy_dev_sched
262 family of functions overcome these issues.
264 The device driver may call the
265 .Fn destroy_dev_drain
266 function to wait until all devices that have supplied
268 as cdevsw, are destroyed. This is useful when driver knows that
269 .Fn destroy_dev_sched
270 is called for all instantiated devices, but need to postpone module
273 is actually finished for all of them.
277 .Xr destroy_dev_drain 9 ,
285 functions first appeared in
297 .Fn destroy_dev_sched ,
298 .Fn destroy_dev_sched_cb