RP(4) Kernel Interfaces Manual RP(4)NAME
rp - RP-11/RP03 moving-head disk
DESCRIPTION
The files rp0 ... rp7 refer to sections of RP disk drive 0. The files rp8 ... rp15 refer to drive 1 etc. This allows a large disk to be
broken up into more manageable pieces.
The origin and size of the pseudo-disks on each drive are as follows:
disk start length
0 0 81000
1 0 5000
2 5000 2000
3 7000 74000
4-7 unassigned
Thus rp0 covers the whole drive, while rp1, rp2, rp3 can serve usefully as a root, swap, and mounted user file system respectively.
The rp files access the disk via the system's normal buffering mechanism and may be read and written without regard to physical disk
records. There is also a `raw' interface which provides for direct transmission between the disk and the user's read or write buffer. A
single read or write call results in exactly one I/O operation and therefore raw I/O is considerably more efficient when many words are
transmitted. The names of the raw RP files begin with rrp and end with a number which selects the same disk section as the corresponding
rp file.
In raw I/O the buffer must begin on a word boundary.
FILES
/dev/rp?, /dev/rrp?
SEE ALSO hp(4)BUGS
In raw I/O read and write(2) truncate file offsets to 512-byte block boundaries, and write scribbles on the tail of incomplete blocks.
Thus, in programs that are likely to access raw devices, read, write and lseek(2) should always deal in 512-byte multiples.
RP(4)
Check Out this Related Man Page
RK(4) Kernel Interfaces Manual RK(4)NAME
rk - RK-11/RK03 or RK05 disk
DESCRIPTION
Rk? refers to an entire disk as a single sequentially-addressed file. Its 256-word blocks are numbered 0 to 4871. Minor device numbers
are drive numbers on one controller.
The rk files discussed above access the disk via the system's normal buffering mechanism and may be read and written without regard to
physical disk records. There is also a `raw' interface which provides for direct transmission between the disk and the user's read or
write buffer. A single read or write call results in exactly one I/O operation and therefore raw I/O is considerably more efficient when
many words are transmitted. The names of the raw RK files begin with rrk and end with a number which selects the same disk as the corre-
sponding rk file.
In raw I/O the buffer must begin on a word boundary, and counts should be a multiple of 512 bytes (a disk block). Likewise seek calls
should specify a multiple of 512 bytes.
FILES
/dev/rk?, /dev/rrk?
BUGS
In raw I/O read and write(2) truncate file offsets to 512-byte block boundaries, and write scribbles on the tail of incomplete blocks.
Thus, in programs that are likely to access raw devices, read, write and lseek(2) should always deal in 512-byte multiples.
RK(4)
Hi,
is it possible to write files via write() to a socket and read it on the other side via read(), without going through buffers? Iif not via write() and read() are there other possibilities?
thanks
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Thank you,
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