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namespaces.7: Note an idiosyncracy of /proc/[pid]/ns/pid_for_children 

/proc/[pid]/ns/pid_for_children has a value only after first
child is created in PID namespace. Verified by experiment.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2018-02-21 17:31:48 +01:00
parent 0813749503
commit 1a7e08e367
1 changed files with 5 additions and 0 deletions
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man7/namespaces.7
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@ -203,6 +203,11 @@ and
.BR pid_namespaces (7)),
so the file may differ from
.IR /proc/[pid]/ns/pid .
The symbolic link gains a value only after the first child process
is created in the namespace.
(Beforehand,
.BR readlink (2)
of the symbolic link will return an empty buffer.)
.TP
.IR /proc/[pid]/ns/user " (since Linux 3.8)"
.\" commit cde1975bc242f3e1072bde623ef378e547b73f91