2 .\" Copyright (c) 1998 Kenneth D. Merry.
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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.
125 This man page covers the basic set of
127 More functions are documented in the man pages listed
130 Many of the CAM library functions use the
135 char device_path[MAXPATHLEN+1];/*
137 * device given by the
141 * name and unit number
144 char given_dev_name[DEV_IDLEN+1];/*
145 * Device name given by
148 uint32_t given_unit_number; /*
149 * Unit number given by
152 char device_name[DEV_IDLEN+1];/*
153 * Name of the device,
156 uint32_t dev_unit_num; /* Unit number of the passthrough
157 * device associated with this
161 char sim_name[SIM_IDLEN+1];/*
162 * Controller name, e.g., 'ahc'
164 uint32_t sim_unit_number; /* Controller unit number */
165 uint32_t bus_id; /* Controller bus number */
166 lun_id_t target_lun; /* Logical Unit Number */
167 target_id_t target_id; /* Target ID */
168 path_id_t path_id; /* System SCSI bus number */
169 uint16_t pd_type; /* type of peripheral device */
170 struct scsi_inquiry_data inq_data; /* SCSI Inquiry data */
171 uint8_t serial_num[252]; /* device serial number */
172 uint8_t serial_num_len; /* length of the serial number */
173 uint8_t sync_period; /* Negotiated sync period */
174 uint8_t sync_offset; /* Negotiated sync offset */
175 uint8_t bus_width; /* Negotiated bus width */
176 int fd; /* file descriptor for device */
181 takes as arguments a string describing the device it is to open, and
183 suitable for passing to
185 The "path" passed in may actually be most any type of string that contains
186 a device name and unit number to be opened.
187 The string will be parsed by
189 into a device name and unit number.
190 Once the device name and unit number
191 are determined, a lookup is performed to determine the passthrough device
192 that corresponds to the given device.
194 .Fn cam_open_spec_device
197 device that corresponds to the device name and unit number passed in.
200 should be flags suitable for passing to
204 argument is optional.
205 The user may supply pre-allocated space for the
212 .Fn cam_open_spec_device
213 will allocate space for the
220 .Fn cam_open_spec_device ,
221 except that it takes a
223 bus, target and logical unit instead of a device name and unit number as
227 argument is the CAM equivalent of a
230 It represents the logical bus number in the system.
233 should be flags suitable for passing to
236 .Fn cam_open_spec_device ,
239 argument is optional.
242 takes as an argument the
247 No translation or lookup is performed, so the path passed
248 in must be that of a CAM
253 should be flags suitable for passing to
258 .Fn cam_open_spec_device
263 if the user wants the CAM library to allocate space for the
269 structure allocated by one of the above open() calls, and closes the file
270 descriptor to the passthrough device.
271 This routine should not be called if
272 the user allocated space for the
275 Instead, the user should call
276 .Fn cam_close_spec_device .
278 .Fn cam_close_spec_device
279 merely closes the file descriptor opened in one of the open() routines
281 This function should be called when the
283 structure was allocated by the caller, rather than the CAM library.
289 and sets fields in the CCB header using values from the
303 frees CCBs allocated by
314 structure, and a string with length
316 It creates a colon-terminated printing prefix string similar to the ones
318 e.g.: "(cd0:ahc1:0:4:0): ".
326 character will be the terminating
330 operates in a fashion similar to
332 It allocates space for a
334 structure and copies the contents of the passed-in
336 structure to the newly allocated structure.
347 argument containing a string with a device name followed by a unit number.
348 It then breaks the string down into a device name and unit number, and
355 can handle strings of the following forms, at least:
357 .Bl -tag -width 1234 -compact
364 is provided as a convenience function for applications that need to provide
365 functionality similar to
366 .Fn cam_open_device .
368 .Fn cam_open_device ,
369 .Fn cam_open_spec_device ,
373 return a pointer to a
377 if there was an error.
380 returns an allocated and partially initialized CCB, or
382 if allocation of the CCB failed.
385 returns a value of -1 if an error occurred, and
387 is set to indicate the error.
390 returns a filled printing prefix string as a convenience.
394 .Fn cam_path_string .
397 returns a copy of the
401 if an error occurred.
404 returns 0 for success, and -1 to indicate failure.
406 If an error is returned from one of the base CAM library functions
407 described here, the reason for the error is generally printed in the global
418 The CAM library first appeared in
421 .An Kenneth Merry Aq Mt ken@FreeBSD.org
424 does not check to see if the
426 passed in is a symlink to something.
427 It also does not check to see if the
429 passed in is an actual
432 The former would be rather easy to implement, but the latter would
433 require a definitive way to identify a device node as a
437 Some of the functions are possibly misnamed or poorly named.