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Annotation of researchv10dc/dist/man/v4/man2/fork.2, revision 1.1.1.1

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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