1998-10-14 06:20:36 +00:00
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.\"
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.\" Copyright (c) 1998 Kenneth D. Merry.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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1999-08-28 00:22:10 +00:00
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.\" $FreeBSD$
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1998-10-14 06:20:36 +00:00
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.\"
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2020-12-29 14:25:46 +00:00
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.Dd November 23, 2020
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1998-10-14 06:20:36 +00:00
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.Dt CAM 3
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2010-04-14 19:08:06 +00:00
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.Os
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1998-10-14 06:20:36 +00:00
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.Sh NAME
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.Nm cam_open_device ,
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.Nm cam_open_spec_device ,
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.Nm cam_open_btl ,
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.Nm cam_open_pass ,
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.Nm cam_close_device ,
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.Nm cam_close_spec_device ,
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.Nm cam_getccb ,
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.Nm cam_send_ccb ,
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.Nm cam_freeccb ,
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.Nm cam_path_string ,
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.Nm cam_device_dup ,
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.Nm cam_device_copy ,
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.Nm cam_get_device
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.Nd CAM user library
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2000-04-22 15:52:37 +00:00
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.Sh LIBRARY
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.Lb libcam
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1998-10-14 06:20:36 +00:00
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.Sh SYNOPSIS
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2001-10-01 16:09:29 +00:00
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.In stdio.h
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.In camlib.h
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1998-10-14 06:20:36 +00:00
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.Ft struct cam_device *
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.Fo cam_open_device
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.Fa "const char *path"
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.Fa "int flags"
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.Fc
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.Ft struct cam_device *
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.Fo cam_open_spec_device
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.Fa "const char *dev_name"
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.Fa "int unit"
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.Fa "int flags"
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.Fa "struct cam_device *device"
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.Fc
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.Ft struct cam_device *
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.Fo cam_open_btl
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.Fa "path_id_t path_id"
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.Fa "target_id_t target_id"
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.Fa "lun_id_t target_lun"
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.Fa "int flags"
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.Fa "struct cam_device *device"
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.Fc
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.Ft struct cam_device *
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.Fo cam_open_pass
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.Fa "const char *path"
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.Fa "int flags"
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.Fa "struct cam_device *device"
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.Fc
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.Ft void
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.Fo cam_close_device
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.Fa "struct cam_device *dev"
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.Fc
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.Ft void
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.Fo cam_close_spec_device
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.Fa "struct cam_device *dev"
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.Fc
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.Ft union ccb *
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.Fo cam_getccb
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.Fa "struct cam_device *dev"
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.Fc
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.Ft int
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.Fo cam_send_ccb
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.Fa "struct cam_device *device"
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.Fa "union ccb *ccb"
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.Fc
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.Ft void
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.Fo cam_freeccb
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.Fa "union ccb *ccb"
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.Fc
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.Ft char *
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.Fo cam_path_string
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.Fa "struct cam_device *dev"
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.Fa "char *str"
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.Fa "int len"
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.Fc
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.Ft struct cam_device *
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.Fo cam_device_dup
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.Fa "struct cam_device *device"
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.Fc
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.Ft void
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.Fo cam_device_copy
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.Fa "struct cam_device *src"
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.Fa "struct cam_device *dst"
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.Fc
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.Ft int
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.Fo cam_get_device
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.Fa "const char *path"
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.Fa "char *dev_name"
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.Fa "int devnamelen"
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.Fa "int *unit"
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.Fc
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.Sh DESCRIPTION
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The CAM library consists of a number of functions designed to aid in
|
2004-07-02 23:52:20 +00:00
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programming with the CAM subsystem.
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This man page covers the basic set of
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library functions.
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More functions are documented in the man pages listed
|
1998-10-14 06:20:36 +00:00
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below.
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.Pp
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Many of the CAM library functions use the
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.Va cam_device
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structure:
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.Bd -literal
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struct cam_device {
|
2017-03-12 05:20:49 +00:00
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char device_path[MAXPATHLEN+1];/*
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1998-10-14 06:20:36 +00:00
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* Pathname of the
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* device given by the
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* user. This may be
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* null if the user
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* states the device
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* name and unit number
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* separately.
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*/
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char given_dev_name[DEV_IDLEN+1];/*
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* Device name given by
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* the user.
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*/
|
2012-02-12 18:29:56 +00:00
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uint32_t given_unit_number; /*
|
1998-10-14 06:20:36 +00:00
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* Unit number given by
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* the user.
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*/
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char device_name[DEV_IDLEN+1];/*
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* Name of the device,
|
2017-03-12 05:20:49 +00:00
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* e.g., 'pass'
|
1998-10-14 06:20:36 +00:00
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*/
|
2012-02-12 18:29:56 +00:00
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uint32_t dev_unit_num; /* Unit number of the passthrough
|
1998-10-14 06:20:36 +00:00
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* device associated with this
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* particular device.
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*/
|
2001-07-15 07:53:42 +00:00
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1998-10-14 06:20:36 +00:00
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char sim_name[SIM_IDLEN+1];/*
|
2017-03-12 05:20:49 +00:00
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* Controller name, e.g., 'ahc'
|
1998-10-14 06:20:36 +00:00
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*/
|
2012-02-12 18:29:56 +00:00
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uint32_t sim_unit_number; /* Controller unit number */
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uint32_t bus_id; /* Controller bus number */
|
1998-10-14 06:20:36 +00:00
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lun_id_t target_lun; /* Logical Unit Number */
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target_id_t target_id; /* Target ID */
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path_id_t path_id; /* System SCSI bus number */
|
2012-02-12 18:29:56 +00:00
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uint16_t pd_type; /* type of peripheral device */
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1998-10-14 06:20:36 +00:00
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struct scsi_inquiry_data inq_data; /* SCSI Inquiry data */
|
2012-02-12 18:29:56 +00:00
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uint8_t serial_num[252]; /* device serial number */
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uint8_t serial_num_len; /* length of the serial number */
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uint8_t sync_period; /* Negotiated sync period */
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uint8_t sync_offset; /* Negotiated sync offset */
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uint8_t bus_width; /* Negotiated bus width */
|
1998-10-14 06:20:36 +00:00
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int fd; /* file descriptor for device */
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};
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.Ed
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.Pp
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.Fn cam_open_device
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takes as arguments a string describing the device it is to open, and
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.Ar flags
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suitable for passing to
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.Xr open 2 .
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The "path" passed in may actually be most any type of string that contains
|
2004-07-02 23:52:20 +00:00
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a device name and unit number to be opened.
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The string will be parsed by
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1998-10-14 06:20:36 +00:00
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.Fn cam_get_device
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2004-07-02 23:52:20 +00:00
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into a device name and unit number.
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Once the device name and unit number
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1998-10-14 06:20:36 +00:00
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are determined, a lookup is performed to determine the passthrough device
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that corresponds to the given device.
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.Pp
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.Fn cam_open_spec_device
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opens the
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.Xr pass 4
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2004-07-02 23:52:20 +00:00
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device that corresponds to the device name and unit number passed in.
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The
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1998-10-14 06:20:36 +00:00
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.Ar flags
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should be flags suitable for passing to
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.Xr open 2 .
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The
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.Ar device
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2004-07-02 23:52:20 +00:00
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argument is optional.
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The user may supply pre-allocated space for the
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1998-10-14 06:20:36 +00:00
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.Va cam_device
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2004-07-02 23:52:20 +00:00
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structure.
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If the
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1998-10-14 06:20:36 +00:00
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.Ar device
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argument is
|
2017-03-12 05:07:33 +00:00
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.Dv NULL ,
|
1998-10-14 06:20:36 +00:00
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.Fn cam_open_spec_device
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will allocate space for the
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.Va cam_device
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structure using
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.Xr malloc 3 .
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.Pp
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.Fn cam_open_btl
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is similar to
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.Fn cam_open_spec_device ,
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2020-07-06 09:53:00 +00:00
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except that it takes a SCSI bus,
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target and logical unit instead of a device name and unit number as
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2004-07-02 23:52:20 +00:00
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arguments.
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The
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1998-10-14 06:20:36 +00:00
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.Va path_id
|
2020-07-06 09:53:00 +00:00
|
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argument is the CAM equivalent of a SCSI bus number.
|
2004-07-02 23:52:20 +00:00
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It represents the logical bus number in the system.
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The
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1998-10-14 06:20:36 +00:00
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.Ar flags
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should be flags suitable for passing to
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.Xr open 2 .
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As with
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.Fn cam_open_spec_device ,
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the
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.Fa device
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argument is optional.
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.Pp
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.Fn cam_open_pass
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takes as an argument the
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.Fa path
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of a
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.Xr pass 4
|
2004-07-02 23:52:20 +00:00
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device to open.
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No translation or lookup is performed, so the path passed
|
1998-10-14 06:20:36 +00:00
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in must be that of a CAM
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.Xr pass 4
|
2004-07-02 23:52:20 +00:00
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device.
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The
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1998-10-14 06:20:36 +00:00
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.Fa flags
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should be flags suitable for passing to
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.Xr open 2 .
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The
|
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.Fa device
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argument, as with
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.Fn cam_open_spec_device
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and
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.Fn cam_open_btl ,
|
2017-03-12 05:07:33 +00:00
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should be
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.Dv NULL
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if the user wants the CAM library to allocate space for the
|
1998-10-14 06:20:36 +00:00
|
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.Va cam_device
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structure.
|
2020-07-06 09:53:00 +00:00
|
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.Pp
|
1998-10-14 06:20:36 +00:00
|
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.Fn cam_close_device
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frees the
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.Va cam_device
|
2020-07-06 09:53:00 +00:00
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structure allocated by one of the above
|
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|
.Xr open 2
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|
calls, and closes the file
|
2004-07-02 23:52:20 +00:00
|
|
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descriptor to the passthrough device.
|
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|
This routine should not be called if
|
1998-10-14 06:20:36 +00:00
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the user allocated space for the
|
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.Va cam_device
|
2004-07-02 23:52:20 +00:00
|
|
|
structure.
|
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|
Instead, the user should call
|
1998-10-14 06:20:36 +00:00
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.Fn cam_close_spec_device .
|
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.Pp
|
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.Fn cam_close_spec_device
|
2020-07-06 09:53:00 +00:00
|
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|
merely closes the file descriptor opened in one of the
|
|
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|
.Xr open 2
|
|
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|
routines
|
2004-07-02 23:52:20 +00:00
|
|
|
described above.
|
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|
This function should be called when the
|
1998-10-14 06:20:36 +00:00
|
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.Va cam_device
|
|
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|
structure was allocated by the caller, rather than the CAM library.
|
|
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.Pp
|
|
|
|
.Fn cam_getccb
|
2020-12-29 14:25:46 +00:00
|
|
|
allocates a prezeroed CCB
|
1998-10-14 06:20:36 +00:00
|
|
|
using
|
2020-12-29 14:25:46 +00:00
|
|
|
.Xr calloc 3
|
1998-10-14 06:20:36 +00:00
|
|
|
and sets fields in the CCB header using values from the
|
|
|
|
.Va cam_device
|
|
|
|
structure.
|
|
|
|
.Pp
|
|
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|
.Fn cam_send_ccb
|
|
|
|
sends the given
|
|
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|
.Va ccb
|
|
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|
to the
|
|
|
|
.Fa device
|
|
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|
described in the
|
|
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|
.Va cam_device
|
|
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|
structure.
|
|
|
|
.Pp
|
|
|
|
.Fn cam_freeccb
|
|
|
|
frees CCBs allocated by
|
|
|
|
.Fn cam_getccb .
|
2017-03-13 02:12:33 +00:00
|
|
|
If
|
|
|
|
.Va ccb
|
|
|
|
is
|
|
|
|
.Dv NULL ,
|
|
|
|
no action is taken.
|
1998-10-14 06:20:36 +00:00
|
|
|
.Pp
|
|
|
|
.Fn cam_path_string
|
|
|
|
takes as arguments a
|
|
|
|
.Va cam_device
|
|
|
|
structure, and a string with length
|
|
|
|
.Fa len .
|
|
|
|
It creates a colon-terminated printing prefix string similar to the ones
|
2004-07-02 23:52:20 +00:00
|
|
|
used by the kernel.
|
2004-07-03 22:30:10 +00:00
|
|
|
e.g.: "(cd0:ahc1:0:4:0): ".
|
1998-10-14 06:20:36 +00:00
|
|
|
.Fn cam_path_string
|
|
|
|
will place at most
|
|
|
|
.Fa len Ns \-1
|
|
|
|
characters into
|
|
|
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.Ar str .
|
|
|
|
The
|
|
|
|
.Ar len Ns 'th
|
|
|
|
character will be the terminating
|
|
|
|
.Ql \e0 .
|
|
|
|
.Pp
|
|
|
|
.Fn cam_device_dup
|
|
|
|
operates in a fashion similar to
|
|
|
|
.Xr strdup 3 .
|
|
|
|
It allocates space for a
|
|
|
|
.Va cam_device
|
|
|
|
structure and copies the contents of the passed-in
|
|
|
|
.Fa device
|
|
|
|
structure to the newly allocated structure.
|
|
|
|
.Pp
|
|
|
|
.Fn cam_device_copy
|
|
|
|
copies the
|
|
|
|
.Fa src
|
|
|
|
structure to
|
|
|
|
.Fa dst .
|
|
|
|
.Pp
|
|
|
|
.Fn cam_get_device
|
|
|
|
takes a
|
|
|
|
.Fa path
|
|
|
|
argument containing a string with a device name followed by a unit number.
|
|
|
|
It then breaks the string down into a device name and unit number, and
|
|
|
|
passes them back in
|
|
|
|
.Fa dev_name
|
|
|
|
and
|
|
|
|
.Fa unit ,
|
|
|
|
respectively.
|
|
|
|
.Fn cam_get_device
|
|
|
|
can handle strings of the following forms, at least:
|
|
|
|
.Pp
|
|
|
|
.Bl -tag -width 1234 -compact
|
2010-10-11 09:27:37 +00:00
|
|
|
.It /dev/foo1
|
1998-10-14 06:20:36 +00:00
|
|
|
.It foo0
|
2010-10-11 09:27:37 +00:00
|
|
|
.It nsa2
|
1998-10-14 06:20:36 +00:00
|
|
|
.El
|
|
|
|
.Pp
|
|
|
|
.Fn cam_get_device
|
|
|
|
is provided as a convenience function for applications that need to provide
|
|
|
|
functionality similar to
|
|
|
|
.Fn cam_open_device .
|
|
|
|
.Sh RETURN VALUES
|
|
|
|
.Fn cam_open_device ,
|
|
|
|
.Fn cam_open_spec_device ,
|
|
|
|
.Fn cam_open_btl ,
|
|
|
|
and
|
|
|
|
.Fn cam_open_pass
|
|
|
|
return a pointer to a
|
|
|
|
.Va cam_device
|
2017-03-12 05:07:33 +00:00
|
|
|
structure, or
|
|
|
|
.Dv NULL
|
|
|
|
if there was an error.
|
1998-10-14 06:20:36 +00:00
|
|
|
.Pp
|
|
|
|
.Fn cam_getccb
|
2017-03-12 05:07:33 +00:00
|
|
|
returns an allocated and partially initialized CCB, or
|
|
|
|
.Dv NULL
|
|
|
|
if allocation of the CCB failed.
|
1998-10-14 06:20:36 +00:00
|
|
|
.Pp
|
|
|
|
.Fn cam_send_ccb
|
2010-08-06 14:33:42 +00:00
|
|
|
returns a value of -1 if an error occurred, and
|
1998-10-14 06:20:36 +00:00
|
|
|
.Va errno
|
|
|
|
is set to indicate the error.
|
|
|
|
.Pp
|
|
|
|
.Fn cam_path_string
|
2004-07-02 23:52:20 +00:00
|
|
|
returns a filled printing prefix string as a convenience.
|
|
|
|
This is the same
|
1998-10-14 06:20:36 +00:00
|
|
|
.Fa str
|
|
|
|
that is passed into
|
|
|
|
.Fn cam_path_string .
|
|
|
|
.Pp
|
|
|
|
.Fn cam_device_dup
|
|
|
|
returns a copy of the
|
|
|
|
.Va device
|
2017-03-12 05:07:33 +00:00
|
|
|
passed in, or
|
|
|
|
.Dv NULL
|
|
|
|
if an error occurred.
|
1998-10-14 06:20:36 +00:00
|
|
|
.Pp
|
|
|
|
.Fn cam_get_device
|
|
|
|
returns 0 for success, and -1 to indicate failure.
|
|
|
|
.Pp
|
|
|
|
If an error is returned from one of the base CAM library functions
|
|
|
|
described here, the reason for the error is generally printed in the global
|
|
|
|
string
|
|
|
|
.Va cam_errbuf
|
|
|
|
which is
|
|
|
|
.Dv CAM_ERRBUF_SIZE
|
|
|
|
characters long.
|
|
|
|
.Sh SEE ALSO
|
|
|
|
.Xr cam_cdbparse 3 ,
|
|
|
|
.Xr pass 4 ,
|
1999-08-15 09:51:25 +00:00
|
|
|
.Xr camcontrol 8
|
1998-10-14 06:20:36 +00:00
|
|
|
.Sh HISTORY
|
|
|
|
The CAM library first appeared in
|
|
|
|
.Fx 3.0 .
|
|
|
|
.Sh AUTHORS
|
2014-06-23 08:23:05 +00:00
|
|
|
.An Kenneth Merry Aq Mt ken@FreeBSD.org
|
1998-10-14 06:20:36 +00:00
|
|
|
.Sh BUGS
|
|
|
|
.Fn cam_open_device
|
2005-02-13 22:25:33 +00:00
|
|
|
does not check to see if the
|
1998-10-14 06:20:36 +00:00
|
|
|
.Fa path
|
2004-07-02 23:52:20 +00:00
|
|
|
passed in is a symlink to something.
|
2005-02-13 22:25:33 +00:00
|
|
|
It also does not check to see if the
|
1998-10-14 06:20:36 +00:00
|
|
|
.Fa path
|
|
|
|
passed in is an actual
|
|
|
|
.Xr pass 4
|
2004-07-02 23:52:20 +00:00
|
|
|
device.
|
|
|
|
The former would be rather easy to implement, but the latter would
|
1998-10-14 06:20:36 +00:00
|
|
|
require a definitive way to identify a device node as a
|
|
|
|
.Xr pass 4
|
|
|
|
device.
|
|
|
|
.Pp
|
2017-03-12 05:20:49 +00:00
|
|
|
Some of the functions are possibly misnamed or poorly named.
|