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Documentation: update the description of TracerPid in procfs.rst

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When the tracer of process is outside of current pid namespace, field
`TracerPid` in /proc/<pid>/status will be 0, too, just like this process
not have been traced.

This is because that function `task_pid_nr_ns` used to get the pid of
tracer will return 0 in this situation.

Co-authored-by: Yuan Haisheng <heysion@deepin.com>
Signed-off-by: Chen Linxuan <chenlinxuan@uniontech.com>
Link: https://lore.kernel.org/r/20221102081517.19770-1-chenlinxuan@uniontech.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Chen Linxuan 2022-11-02 16:15:17 +08:00 committed by Jonathan Corbet
parent 5478cf6ae5
commit df61e945e1
1 changed files with 2 additions and 1 deletions
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Documentation/filesystems/proc.rst
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@ -245,7 +245,8 @@ It's slow but very precise.
Ngid NUMA group ID (0 if none)
Pid process id
PPid process id of the parent process
TracerPid PID of process tracing this process (0 if not)
TracerPid PID of process tracing this process (0 if not, or
the tracer is outside of the current pid namespace)
Uid Real, effective, saved set, and file system UIDs
Gid Real, effective, saved set, and file system GIDs
FDSize number of file descriptor slots currently allocated