mirror of
https://github.com/systemd/systemd.git
synced 2024-11-28 12:53:36 +08:00
6bb648a16a
Documentation was updated to refer to either 'libsystemd' or 'sd-bus' in place of libsystemd-bus.
276 lines
12 KiB
XML
276 lines
12 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
||
<!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">
|
||
|
||
<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 <systemd/sd-bus.h></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_PID_STARTTIME</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_PID_STARTTIME</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 sucessfully 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 futher
|
||
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><varname>-ESRCH</varname></term>
|
||
|
||
<listitem><para>Specified <parameter>pid</parameter> could not
|
||
be found.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>-EINVAL</varname></term>
|
||
|
||
<listitem><para>Specified parameter is invalid
|
||
(<constant>NULL</constant> in case of output
|
||
parameters).</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>-ENOMEM</varname></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><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_pid_starttime</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>
|