mirror of https://github.com/mkerrisk/man-pages
clone.2: Mention that CLONE_PARENT is off-limits for inits
The CLONE_PARENT flag cannot but used by init processes. Let's mention this in the manpages to prevent surprises. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -648,6 +648,13 @@ if
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.B CLONE_PARENT
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.B CLONE_PARENT
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is set, then the parent of the calling process, rather than the
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is set, then the parent of the calling process, rather than the
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calling process itself, will be signaled.
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calling process itself, will be signaled.
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.IP
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The kernel will not allow global init and init processes in pid
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namespaces to use the
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.B CLONE_PARENT
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flag. This is done to prevent the creation of multi-rooted process
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trees. It also avoids unreapable zombies in the initial pid
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namespace.
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.TP
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.TP
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.BR CLONE_PARENT_SETTID " (since Linux 2.5.49)"
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.BR CLONE_PARENT_SETTID " (since Linux 2.5.49)"
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Store the child thread ID at the location pointed to by
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Store the child thread ID at the location pointed to by
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