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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>
This commit is contained in:
Christian Brauner 2019-11-20 11:45:04 +01:00 committed by Michael Kerrisk
parent a10c5a33de
commit a17b9d28c3
1 changed files with 7 additions and 0 deletions
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@ -648,6 +648,13 @@ if
.B CLONE_PARENT
is set, then the parent of the calling process, rather than the
calling process itself, will be signaled.
.IP
The kernel will not allow global init and init processes in pid
namespaces to use the
.B CLONE_PARENT
flag. This is done to prevent the creation of multi-rooted process
trees. It also avoids unreapable zombies in the initial pid
namespace.
.TP
.BR CLONE_PARENT_SETTID " (since Linux 2.5.49)"
Store the child thread ID at the location pointed to by