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authorLennart Poettering <lennart@poettering.net>2013-04-16 04:36:06 +0200
committerLennart Poettering <lennart@poettering.net>2013-04-16 04:41:21 +0200
commit7027ff61a34a12487712b382a061c654acc3a679 (patch)
tree05e9374a566d6accdd962dd4dc6d7076b9304122 /man/sd_pid_get_session.xml
parentcec4ead904978b07db2154c618eeb48d3102da66 (diff)
nspawn: introduce the new /machine/ tree in the cgroup tree and move containers there
Containers will now carry a label (normally derived from the root directory name, but configurable by the user), and the container's root cgroup is /machine/<label>. This label is called "machine name", and can cover both containers and VMs (as soon as libvirt also makes use of /machine/). libsystemd-login can be used to query the machine name from a process. This patch also includes numerous clean-ups for the cgroup code.
Diffstat (limited to 'man/sd_pid_get_session.xml')
-rw-r--r--man/sd_pid_get_session.xml28
1 files changed, 22 insertions, 6 deletions
diff --git a/man/sd_pid_get_session.xml b/man/sd_pid_get_session.xml
index d2b64195a6..543a5c0c72 100644
--- a/man/sd_pid_get_session.xml
+++ b/man/sd_pid_get_session.xml
@@ -47,7 +47,8 @@
<refname>sd_pid_get_unit</refname>
<refname>sd_pid_get_user_unit</refname>
<refname>sd_pid_get_owner_uid</refname>
- <refpurpose>Determine session, service or owner of a session of a specific PID</refpurpose>
+ <refname>sd_pid_get_machine_name</refname>
+ <refpurpose>Determine session, service, owner of a session or container/VM of a specific PID</refpurpose>
</refnamediv>
<refsynopsisdiv>
@@ -77,6 +78,12 @@
<paramdef>pid_t <parameter>pid</parameter></paramdef>
<paramdef>uid_t* <parameter>uid</parameter></paramdef>
</funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_pid_get_machine_name</function></funcdef>
+ <paramdef>pid_t <parameter>pid</parameter></paramdef>
+ <paramdef>char** <parameter>name</parameter></paramdef>
+ </funcprototype>
</funcsynopsis>
</refsynopsisdiv>
@@ -108,7 +115,7 @@
function will fail. (More specifically: this call will
not work for processes that are part of user units,
use <function>sd_pid_get_user_unit()</function> for
- that.) The returned string needs to be freed with the
+ that.) The returned string needs to be freed with the
libc
<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
call after use.</para>
@@ -131,6 +138,14 @@
and not being a shared process of a user this function
will fail.</para>
+ <para><function>sd_pid_machine_name()</function> may
+ be used to determine the name of the VM or container
+ is a member of. The machine name is a short string,
+ suitable for usage in file system paths. The returned
+ string needs to be freed with the libc
+ <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ call after use.</para>
+
<para>If the <literal>pid</literal> parameter of any
of these functions is passed as 0 the operation is
executed for the calling process.</para>
@@ -149,10 +164,11 @@
<para>The <function>sd_pid_get_session()</function>,
<function>sd_pid_get_unit()</function>,
- <function>sd_pid_get_user_unit()</function>, and
- <function>sd_pid_get_owner_uid()</function> interfaces
- are available as shared library, which can be compiled
- and linked to with the
+ <function>sd_pid_get_user_unit()</function>,
+ <function>sd_pid_get_owner_uid()</function> and
+ <function>sd_pid_get_machine_name()</function>
+ interfaces are available as shared library, which can
+ be compiled and linked to with the
<literal>libsystemd-login</literal>
<citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
file.</para>