V3/usr/man/man2/seek.2

Find at most related files.
including files from this version of Unix. 
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.he 'SEEK (II)'3/15/72'SEEK (II)'
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NAME		seek  --  move read/write pointer
.sp
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SYNOPSIS	(file descriptor in r0)
.br
sys seek; offset; ptrname  / seek = 19.
.a
.sp
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DESCRIPTION	The file
descriptor refers to a file open for reading or writing.
The read (resp. write) pointer for the file is set as follows:
.in +3
.sp
if ptrname_______ is 0, the pointer is set to offset______.
.sp
if ptrname_______
is 1, the pointer is set to its current location plus offset______.
.sp
if ptrname_______ is 2, the pointer is set to the size of the
file plus offset______.
.sp
.in -3
.sp
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SEE ALSO	--
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DIAGNOSTICS	The error bit
(c-bit) is set for an undefined file descriptor.
.sp
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BUGS		A file
can conceptually be as large
as 2**20 bytes.
Clearly only 2**16 bytes can be addressed by
seek____.
The problem is most acute on the
large special files.