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fork - spawn new process
Fork is the only way new processes are created. The new process's core image is a copy of
that of the caller of fork. The only distinction is the fact that the value returned in
the old (parent) process contains the process ID of the new (child) process, while the
value returned in the child is 0. Process ID's range from 1 to 30,000. This process ID
is used by wait(2).
Files open before the fork are shared, and have a common read-write pointer. In particu-
lar, this is the way that standard input and output files are passed and also how pipes
are set up.
Returns -1 and fails to create a process if: there is inadequate swap space, the user is
not super-user and has too many processes, or the system's process table is full. Only
the super-user can take the last process-table slot.
(fork = 2.)
(new process return)
(old process return, new process ID in r0)
The return locations in the old and new process differ by one word. The C-bit is set in
the old process if a new process could not be created.
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