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sys-fork(2) - Unix First Edition Manual Page
11/3/71SYS_FORK (II)

NAME fork -- spawn new process
SYNOPSIS sys fork / fork = 2.(new process return)

(old process return)
DESCRIPTION fork is the only way new processes are created. The newprocess's core image is a copy of that of the caller of

fork the only distinction is the return location and thefact that r0 in the old process contains the process ID of the new process. This process ID is used by wait.
SEE_ALSO sys wait, sys exec
DIAGNOSTICS The error bit (c--bit) is set in the old process if a newprocess could not be created because of lack of swap

BUGS See wait for a subtle bug in process destruction.
OWNER ken, dmr