15d42eb26b
Currently, the fdinfo file contains the Pid field which shows the pid a given pidfd refers to in the pid namespace of the procfs instance. If pid namespaces are configured, also show an NSpid field for easy retrieval of the pid in all descendant pid namespaces. If the pid namespace of the process is not a descendant of the pid namespace of the procfs instance 0 will be shown as its first NSpid entry and no other entries will be shown. Add a block comment to pidfd_show_fdinfo with a detailed explanation of Pid and NSpid fields. Co-developed-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Christian Kellner <christian@kellner.me> Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com> Link: https://lore.kernel.org/r/20191014162034.2185-1-ckellner@redhat.com Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.