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  Linux HOWTOs -> The Linux SCSI Generic (sg) HOWTO              
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The Linux SCSI Generic (sg) HOWTO
Table of Contents
1. Introduction
2. What the sg driver does
3. Identifying the version of the SG driver
4. Interface
5. Theory of operation
6. The sg_io_hdr_t structure in detail
6.1. interface_id
6.2. dxfer_direction
6.3. cmd_len
6.4. mx_sb_len
6.5. iovec_count
6.6. dxfer_len
6.7. dxferp
6.8. cmdp
6.9. sbp
6.10. timeout
6.11. flags
6.12. pack_id
6.13. usr_ptr
6.14. status
6.15. masked_status
6.16. msg_status
6.17. sb_len_wr
6.18. host_status
6.19. driver_status
6.20. resid
6.21. duration
6.22. info
7. System calls
7.1. open()
7.2. write()
7.3. read()
7.4. poll()
7.5. close()
7.6. mmap()
7.7. fcntl(sg_fd, F_SETFL, oflags | FASYNC)
7.8. Errors reported in errno
8. Ioctl()s
8.1. SG_IO
8.2. SG_GET_ACCESS_COUNT
8.3. SG_SET_COMMAND_Q (and _GET_)
8.4. SG_SET_DEBUG
8.5. SG_EMULATED_HOST
8.6. SG_SET_KEEP_ORPHAN (and _GET_)
8.7. SG_SET_FORCE_LOW_DMA
8.8. SG_GET_LOW_DMA
8.9. SG_NEXT_CMD_LEN
8.10. SG_GET_NUM_WAITING
8.11. SG_SET_FORCE_PACK_ID
8.12. SG_GET_PACK_ID
8.13. SG_GET_REQUEST_TABLE
8.14. SG_SET_RESERVED_SIZE (and _GET_ )
8.15. SG_SCSI_RESET
8.16. SG_GET_SCSI_ID
8.17. SG_GET_SG_TABLESIZE
8.18. SG_GET_TIMEOUT
8.19. SG_SET_TIMEOUT
8.20. SG_SET_TRANSFORM
8.21. SG_GET_TRANSFORM
8.22. Sg ioctls removed in version 3
8.23. SCSI_IOCTL_GET_IDLUN
8.24. SCSI_IOCTL_GET_PCI
8.25. SCSI_IOCTL_PROBE_HOST
8.26. SCSI_IOCTL_SEND_COMMAND
9. Direct and Mmap-ed IO
9.1. Direct IO
9.2. Mmap-ed IO
10. Driver and module initialization
11. Sg and the "proc" file system
11.1. /proc/scsi/sg/debug
12. Asynchronous usage of sg
A. Sg3_utils package
B. sg_header, the original sg control structure
C. Programming example
D. Debugging
E. Other references
Copyright © 2004-2005 DeniX Solutions SRL
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