[Bug 215769] New: man 2 vfork() does not document corner case when PID == 1

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215769

            Bug ID: 215769
           Summary: man 2 vfork() does not document corner case when PID
                    == 1
           Product: Documentation
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: man-pages
          Assignee: documentation_man-pages@kernel-bugs.osdl.org
          Reporter: socketpair@gmail.com
        Regression: No

If a process has PID=1 (for example in pid namespace), calling vfork() always
returns EINVAL. (https://bugs.python.org/issue47151).

Please add this informtion in "RETURN VALUE" section or just in somewhere else
in the manpage.

Actually, it may be a bug in Linux kernel, I don't know. Possibly because the
init process must not be suspended ?

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