systemd/man/sd_bus_creds_new_from_pid.xml
Lennart Poettering 3280236156 sd-bus: get rid of PID starttime concept
As kdbus no longer exports this, remove all traces from sd-bus too
2014-12-09 18:16:54 +01:00

273 lines
12 KiB
XML
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
This file is part of systemd.
Copyright 2014 Zbigniew Jędrzejewski-Szmek
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
<refentry id="sd_bus_creds_new_from_pid" conditional="ENABLE_KDBUS">
<refentryinfo>
<title>sd_bus_creds_new_from_pid</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>A monkey with a typewriter</contrib>
<firstname>Zbigniew</firstname>
<surname>Jędrzejewski-Szmek</surname>
<email>zbyszek@in.waw.pl</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>sd_bus_creds_new_from_pid</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>sd_bus_creds_new_from_pid</refname>
<refname>sd_bus_creds_get_mask</refname>
<refname>sd_bus_creds_ref</refname>
<refname>sd_bus_creds_unref</refname>
<refpurpose>Retrieve credentials object for the specified PID</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
<funcprototype>
<funcdef>int <function>sd_bus_creds_new_from_pid</function></funcdef>
<paramdef>pid_t <parameter>pid</parameter></paramdef>
<paramdef>uint64_t <parameter>creds_mask</parameter></paramdef>
<paramdef>sd_bus_creds **<parameter>ret</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>uint64_t <function>sd_bus_creds_get_mask</function></funcdef>
<paramdef>const sd_bus_creds *<parameter>c</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>sd_bus_creds *<function>sd_bus_creds_ref</function></funcdef>
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>sd_bus_creds *<function>sd_bus_creds_unref</function></funcdef>
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
</funcprototype>
</funcsynopsis>
<para>
<constant>SD_BUS_CREDS_PID</constant>,
<constant>SD_BUS_CREDS_TID</constant>,
<constant>SD_BUS_CREDS_UID</constant>,
<constant>SD_BUS_CREDS_GID</constant>,
<constant>SD_BUS_CREDS_COMM</constant>,
<constant>SD_BUS_CREDS_TID_COMM</constant>,
<constant>SD_BUS_CREDS_EXE</constant>,
<constant>SD_BUS_CREDS_CMDLINE</constant>,
<constant>SD_BUS_CREDS_CGROUP</constant>,
<constant>SD_BUS_CREDS_UNIT</constant>,
<constant>SD_BUS_CREDS_USER_UNIT</constant>,
<constant>SD_BUS_CREDS_SLICE</constant>,
<constant>SD_BUS_CREDS_SESSION</constant>,
<constant>SD_BUS_CREDS_OWNER_UID</constant>,
<constant>SD_BUS_CREDS_EFFECTIVE_CAPS</constant>,
<constant>SD_BUS_CREDS_PERMITTED_CAPS</constant>,
<constant>SD_BUS_CREDS_INHERITABLE_CAPS</constant>,
<constant>SD_BUS_CREDS_BOUNDING_CAPS</constant>,
<constant>SD_BUS_CREDS_SELINUX_CONTEXT</constant>,
<constant>SD_BUS_CREDS_AUDIT_SESSION_ID</constant>,
<constant>SD_BUS_CREDS_AUDIT_LOGIN_UID</constant>,
<constant>SD_BUS_CREDS_UNIQUE_NAME</constant>,
<constant>SD_BUS_CREDS_WELL_KNOWN_NAMES</constant>,
<constant>_SD_BUS_CREDS_ALL</constant>
</para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><function>sd_bus_creds_new_from_pid()</function> creates a new
credentials object and fills it with information about the process
<parameter>pid</parameter>. This pointer to this object will
be stored in <parameter>ret</parameter> pointer.</para>
<para>The information that will be stored is determined by
<parameter>creds_mask</parameter>. It may contain a subset of ORed
constants <constant>SD_BUS_CREDS_PID</constant>,
<constant>SD_BUS_CREDS_TID</constant>,
<constant>SD_BUS_CREDS_UID</constant>,
<constant>SD_BUS_CREDS_GID</constant>,
<constant>SD_BUS_CREDS_COMM</constant>,
<constant>SD_BUS_CREDS_TID_COMM</constant>,
<constant>SD_BUS_CREDS_EXE</constant>,
<constant>SD_BUS_CREDS_CMDLINE</constant>,
<constant>SD_BUS_CREDS_CGROUP</constant>,
<constant>SD_BUS_CREDS_UNIT</constant>,
<constant>SD_BUS_CREDS_USER_UNIT</constant>,
<constant>SD_BUS_CREDS_SLICE</constant>,
<constant>SD_BUS_CREDS_SESSION</constant>,
<constant>SD_BUS_CREDS_OWNER_UID</constant>,
<constant>SD_BUS_CREDS_EFFECTIVE_CAPS</constant>,
<constant>SD_BUS_CREDS_PERMITTED_CAPS</constant>,
<constant>SD_BUS_CREDS_INHERITABLE_CAPS</constant>,
<constant>SD_BUS_CREDS_BOUNDING_CAPS</constant>,
<constant>SD_BUS_CREDS_SELINUX_CONTEXT</constant>,
<constant>SD_BUS_CREDS_AUDIT_SESSION_ID</constant>,
<constant>SD_BUS_CREDS_AUDIT_LOGIN_UID</constant>,
<constant>SD_BUS_CREDS_UNIQUE_NAME</constant>,
<constant>SD_BUS_CREDS_WELL_KNOWN_NAMES</constant>,
or <constant>_SD_BUS_CREDS_ALL</constant> to indicate
all known fields.</para>
<para>Fields can be retrieved from the credentials object using
<citerefentry><refentrytitle>sd_bus_creds_get_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>
and other functions which correspond directly to the constants
listed above.</para>
<para>A mask of fields which were actually successfully set
(acquired from <filename>/proc</filename>, etc.) can be retrieved
with <function>sd_bus_creds_get_mask()</function>. If the
credentials object was created with
<function>sd_bus_creds_new_from_pid()</function>, this will be a
subset of fields requested in <parameter>creds_mask</parameter>.
</para>
<para><function>sd_bus_creds_ref</function> creates a new
reference to the credentials object <parameter>c</parameter>. This
object will not be destroyed until
<function>sd_bus_creds_unref</function> has been called as many
times plus once more. Once the reference count has dropped to zero,
<parameter>c</parameter> cannot be used anymore, so further
calls to <function>sd_bus_creds_ref(c)</function> or
<function>sd_bus_creds_unref(c)</function> are illegal.</para>
<para><function>sd_bus_creds_unref</function> destroys a reference
to <parameter>c</parameter>.</para>
</refsect1>
<refsect1>
<title>Return Value</title>
<para>On success, <function>sd_bus_creds_new_from_pid()</function>
returns 0 or a positive integer. On failure, it returns a negative
errno-style error code.</para>
<para><function>sd_bus_creds_get_mask()</function> returns the
mask of successfully acquired fields.</para>
<para><function>sd_bus_creds_ref</function> always returns the
argument.</para>
<para><function>sd_bus_creds_unref</function> always returns
<constant>NULL</constant>.</para>
</refsect1>
<refsect1>
<title>Reference ownership</title>
<para>Function <function>sd_bus_creds_new_from_pid()</function>
creates a new object and the caller owns the sole reference. When
not needed anymore, this reference should be destroyed with
<citerefentry><refentrytitle>sd_bus_creds_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
</para>
</refsect1>
<refsect1>
<title>Errors</title>
<para>Returned errors may indicate the following problems:</para>
<variablelist>
<varlistentry>
<term><constant>-ESRCH</constant></term>
<listitem><para>Specified <parameter>pid</parameter> could not
be found.</para></listitem>
</varlistentry>
<varlistentry>
<term><constant>-EINVAL</constant></term>
<listitem><para>Specified parameter is invalid
(<constant>NULL</constant> in case of output
parameters).</para></listitem>
</varlistentry>
<varlistentry>
<term><constant>-ENOMEM</constant></term>
<listitem><para>Memory allocation failed.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Notes</title>
<para><function>sd_bus_creds_new_from_pid()</function> is
available as a shared library, which can be compiled and linked to
with the
<constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
file.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_ref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_tid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_uid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_gid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_comm</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_tid_comm</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_exe</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_cmdline</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_cgroup</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_unit</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_user_unit</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_slice</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_session</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_owner_uid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_has_effective_cap</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_has_permitted_cap</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_has_inheritable_cap</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_has_bounding_cap</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_selinux_context</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_audit_session_id</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_audit_login_uid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_unique_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_creds_get_well_known_names</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>