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Annotation of researchv10dc/dist/man/v4/man2/fork.2, revision 1.1

1.1     ! root        1: .th FORK II 8/5/73
        !             2: .sh NAME
        !             3: fork  \*-  spawn new process
        !             4: .sh SYNOPSIS
        !             5: (fork = 2.)
        !             6: .br
        !             7: .ft B
        !             8: sys fork
        !             9: .br
        !            10: .ft R
        !            11: (new process return)
        !            12: .br
        !            13: (old process return)
        !            14: .s3
        !            15: .ft B
        !            16: fork( )
        !            17: .ft R
        !            18: .sh DESCRIPTION
        !            19: .it Fork
        !            20: is the only way new processes are created.
        !            21: The new process's core image is a copy of
        !            22: that of the caller of
        !            23: .it fork.
        !            24: The only distinction
        !            25: is the return location and the fact
        !            26: that r0 in the old (parent) process contains the process ID
        !            27: of the new (child) process.
        !            28: This process ID is used by
        !            29: .it wait.
        !            30: .s3
        !            31: From C, the returned value is 0 in the child process,
        !            32: non-zero in the parent process; however,
        !            33: a return of \*-1 indicates inability
        !            34: to create a new process.
        !            35: .sh "SEE ALSO"
        !            36: wait(II), exec(II)
        !            37: .sh DIAGNOSTICS
        !            38: The error bit
        !            39: (c-bit) is set in the old process if a new process
        !            40: could not be created because of lack of process space.
        !            41: From C, a return of \*-1 (not just negative)
        !            42: indicates an error.

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