2 .\" Copyright (c) 1998 Kenneth D. Merry.
3 .\" All rights reserved.
5 .\" Redistribution and use in source and binary forms, with or without
6 .\" modification, are permitted provided that the following conditions
8 .\" 1. Redistributions of source code must retain the above copyright
9 .\" notice, this list of conditions and the following disclaimer.
10 .\" 2. Redistributions in binary form must reproduce the above copyright
11 .\" notice, this list of conditions and the following disclaimer in the
12 .\" documentation and/or other materials provided with the distribution.
13 .\" 3. The name of the author may not be used to endorse or promote products
14 .\" derived from this software without specific prior written permission.
16 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 .Nm cam_open_spec_device ,
38 .Nm cam_close_device ,
39 .Nm cam_close_spec_device ,
53 .Ft struct cam_device *
55 .Fa "const char *path"
58 .Ft struct cam_device *
59 .Fo cam_open_spec_device
60 .Fa "const char *dev_name"
63 .Fa "struct cam_device *device"
65 .Ft struct cam_device *
67 .Fa "path_id_t path_id"
68 .Fa "target_id_t target_id"
69 .Fa "lun_id_t target_lun"
71 .Fa "struct cam_device *device"
73 .Ft struct cam_device *
75 .Fa "const char *path"
77 .Fa "struct cam_device *device"
81 .Fa "struct cam_device *dev"
84 .Fo cam_close_spec_device
85 .Fa "struct cam_device *dev"
89 .Fa "struct cam_device *dev"
93 .Fa "struct cam_device *device"
102 .Fa "struct cam_device *dev"
106 .Ft struct cam_device *
108 .Fa "struct cam_device *device"
112 .Fa "struct cam_device *src"
113 .Fa "struct cam_device *dst"
117 .Fa "const char *path"
123 The CAM library consists of a number of functions designed to aid in
124 programming with the CAM subsystem described in
126 This man page covers the basic set of
128 More functions are documented in the man pages listed
131 Many of the CAM library functions use the
136 char device_path[MAXPATHLEN+1];/*
138 * device given by the
142 * name and unit number
145 char given_dev_name[DEV_IDLEN+1];/*
146 * Device name given by
149 uint32_t given_unit_number; /*
150 * Unit number given by
153 char device_name[DEV_IDLEN+1];/*
154 * Name of the device,
157 uint32_t dev_unit_num; /* Unit number of the passthrough
158 * device associated with this
162 char sim_name[SIM_IDLEN+1];/*
163 * Controller name, e.g., 'ahc'
165 uint32_t sim_unit_number; /* Controller unit number */
166 uint32_t bus_id; /* Controller bus number */
167 lun_id_t target_lun; /* Logical Unit Number */
168 target_id_t target_id; /* Target ID */
169 path_id_t path_id; /* System SCSI bus number */
170 uint16_t pd_type; /* type of peripheral device */
171 struct scsi_inquiry_data inq_data; /* SCSI Inquiry data */
172 uint8_t serial_num[252]; /* device serial number */
173 uint8_t serial_num_len; /* length of the serial number */
174 uint8_t sync_period; /* Negotiated sync period */
175 uint8_t sync_offset; /* Negotiated sync offset */
176 uint8_t bus_width; /* Negotiated bus width */
177 int fd; /* file descriptor for device */
182 takes as arguments a string describing the device it is to open, and
184 suitable for passing to
186 The "path" passed in may actually be most any type of string that contains
187 a device name and unit number to be opened.
188 The string will be parsed by
190 into a device name and unit number.
191 Once the device name and unit number
192 are determined, a lookup is performed to determine the passthrough device
193 that corresponds to the given device.
195 .Fn cam_open_spec_device
198 device that corresponds to the device name and unit number passed in.
201 should be flags suitable for passing to
205 argument is optional.
206 The user may supply pre-allocated space for the
213 .Fn cam_open_spec_device
214 will allocate space for the
221 .Fn cam_open_spec_device ,
222 except that it takes a SCSI bus,
223 target and logical unit instead of a device name and unit number as
227 argument is the CAM equivalent of a SCSI bus number.
228 It represents the logical bus number in the system.
231 should be flags suitable for passing to
234 .Fn cam_open_spec_device ,
237 argument is optional.
240 takes as an argument the
245 No translation or lookup is performed, so the path passed
246 in must be that of a CAM
251 should be flags suitable for passing to
256 .Fn cam_open_spec_device
261 if the user wants the CAM library to allocate space for the
268 structure allocated by one of the above
270 calls, and closes the file
271 descriptor to the passthrough device.
272 This routine should not be called if
273 the user allocated space for the
276 Instead, the user should call
277 .Fn cam_close_spec_device .
279 .Fn cam_close_spec_device
280 merely closes the file descriptor opened in one of the
284 This function should be called when the
286 structure was allocated by the caller, rather than the CAM library.
289 allocates a prezeroed CCB
292 and sets fields in the CCB header using values from the
306 frees CCBs allocated by
317 structure, and a string with length
319 It creates a colon-terminated printing prefix string similar to the ones
321 e.g.: "(cd0:ahc1:0:4:0): ".
329 character will be the terminating
333 operates in a fashion similar to
335 It allocates space for a
337 structure and copies the contents of the passed-in
339 structure to the newly allocated structure.
350 argument containing a string with a device name followed by a unit number.
351 It then breaks the string down into a device name and unit number, and
358 can handle strings of the following forms, at least:
360 .Bl -tag -width 1234 -compact
367 is provided as a convenience function for applications that need to provide
368 functionality similar to
369 .Fn cam_open_device .
371 .Fn cam_open_device ,
372 .Fn cam_open_spec_device ,
376 return a pointer to a
380 if there was an error.
383 returns an allocated and partially initialized CCB, or
385 if allocation of the CCB failed.
388 returns a value of -1 if an error occurred, and
390 is set to indicate the error.
393 returns a filled printing prefix string as a convenience.
397 .Fn cam_path_string .
400 returns a copy of the
404 if an error occurred.
407 returns 0 for success, and -1 to indicate failure.
409 If an error is returned from one of the base CAM library functions
410 described here, the reason for the error is generally printed in the global
421 The CAM library first appeared in
424 .An Kenneth Merry Aq Mt ken@FreeBSD.org
427 does not check to see if the
429 passed in is a symlink to something.
430 It also does not check to see if the
432 passed in is an actual
435 The former would be rather easy to implement, but the latter would
436 require a definitive way to identify a device node as a
440 Some of the functions are possibly misnamed or poorly named.