V1/man/man2/seek.2

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        11/3/71                                                SYS SEEK (II)

NAME              seek -- move read/write pointer

SYNOPSIS          (file descriptor in r0)
                  sys      seek; offset; ptrname        / seek = 19.

DESCRIPTION       The file descriptor refers to a file open for reading or writing. The
                  read (or write) pointer for the file is set as follows:

                     if ptrname is 0, the pointer is set to offset.

                     if ptrname is 1, the pointer is set to its current location plus
                     offset.

                     if ptrname is 2, the pointer is set to the size of the file plus
                     offset.

FILES

SEE ALSO          tell

DIAGNOSTICS       The error bit (c--bit) is set for an undefined file descriptor.

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 tape files and RK and RF. Something is going to be done about
                  this.

OWNER             ken, dmr