mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-12-24 21:34:08 +03:00
538 lines
24 KiB
XML
538 lines
24 KiB
XML
<?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">
|
|
|
|
<!--
|
|
SPDX-License-Identifier: LGPL-2.1+
|
|
-->
|
|
|
|
<refentry id="sd_bus_creds_get_pid" xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
|
|
<refentryinfo>
|
|
<title>sd_bus_creds_get_pid</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>sd_bus_creds_get_pid</refentrytitle>
|
|
<manvolnum>3</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>sd_bus_creds_get_pid</refname>
|
|
<refname>sd_bus_creds_get_ppid</refname>
|
|
<refname>sd_bus_creds_get_tid</refname>
|
|
<refname>sd_bus_creds_get_uid</refname>
|
|
<refname>sd_bus_creds_get_euid</refname>
|
|
<refname>sd_bus_creds_get_suid</refname>
|
|
<refname>sd_bus_creds_get_fsuid</refname>
|
|
<refname>sd_bus_creds_get_gid</refname>
|
|
<refname>sd_bus_creds_get_egid</refname>
|
|
<refname>sd_bus_creds_get_sgid</refname>
|
|
<refname>sd_bus_creds_get_fsgid</refname>
|
|
<refname>sd_bus_creds_get_supplementary_gids</refname>
|
|
<refname>sd_bus_creds_get_comm</refname>
|
|
<refname>sd_bus_creds_get_tid_comm</refname>
|
|
<refname>sd_bus_creds_get_exe</refname>
|
|
<refname>sd_bus_creds_get_cmdline</refname>
|
|
<refname>sd_bus_creds_get_cgroup</refname>
|
|
<refname>sd_bus_creds_get_unit</refname>
|
|
<refname>sd_bus_creds_get_slice</refname>
|
|
<refname>sd_bus_creds_get_user_unit</refname>
|
|
<refname>sd_bus_creds_get_user_slice</refname>
|
|
<refname>sd_bus_creds_get_session</refname>
|
|
<refname>sd_bus_creds_get_owner_uid</refname>
|
|
<refname>sd_bus_creds_has_effective_cap</refname>
|
|
<refname>sd_bus_creds_has_permitted_cap</refname>
|
|
<refname>sd_bus_creds_has_inheritable_cap</refname>
|
|
<refname>sd_bus_creds_has_bounding_cap</refname>
|
|
<refname>sd_bus_creds_get_selinux_context</refname>
|
|
<refname>sd_bus_creds_get_audit_session_id</refname>
|
|
<refname>sd_bus_creds_get_audit_login_uid</refname>
|
|
<refname>sd_bus_creds_get_tty</refname>
|
|
<refname>sd_bus_creds_get_unique_name</refname>
|
|
<refname>sd_bus_creds_get_well_known_names</refname>
|
|
<refname>sd_bus_creds_get_description</refname>
|
|
|
|
<refpurpose>Retrieve fields from a credentials object</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<funcsynopsis>
|
|
<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_pid</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>pid_t *<parameter>pid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_ppid</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>pid_t *<parameter>ppid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_tid</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>pid_t *<parameter>tid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_uid</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>uid_t *<parameter>uid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_euid</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>uid_t *<parameter>uid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_suid</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>uid_t *<parameter>uid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_fsuid</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>uid_t *<parameter>uid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_gid</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>gid_t *<parameter>gid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_egid</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>gid_t *<parameter>gid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_sgid</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>gid_t *<parameter>gid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_fsgid</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>gid_t *<parameter>gid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_supplementary_gids</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const gid_t **<parameter>gids</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_comm</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const char **<parameter>comm</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_tid_comm</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const char **<parameter>comm</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_exe</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const char **<parameter>exe</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_cmdline</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>char ***<parameter>cmdline</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_cgroup</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const char **<parameter>cgroup</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_unit</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const char **<parameter>unit</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_slice</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const char **<parameter>slice</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_user_unit</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const char **<parameter>unit</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_user_slice</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const char **<parameter>slice</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_session</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const char **<parameter>slice</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_owner_uid</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>uid_t *<parameter>uid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_has_effective_cap</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>int <parameter>capability</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_has_permitted_cap</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>int <parameter>capability</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_has_inheritable_cap</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>int <parameter>capability</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_has_bounding_cap</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>int <parameter>capability</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_selinux_context</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const char **<parameter>context</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_audit_session_id</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>uint32_t *<parameter>sessionid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_audit_login_uid</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>uid_t *<parameter>loginuid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_tty</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const char **<parameter>tty</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_unique_name</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const char **<parameter>name</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_well_known_names</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>char ***<parameter>name</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_bus_creds_get_description</function></funcdef>
|
|
<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
|
|
<paramdef>const char **<parameter>name</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>These functions return credential information from an
|
|
<parameter>sd_bus_creds</parameter> object. Credential objects may
|
|
be created with
|
|
<citerefentry><refentrytitle>sd_bus_creds_new_from_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
in which case they describe the credentials of the process
|
|
identified by the specified PID, with
|
|
<citerefentry><refentrytitle>sd_bus_get_name_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
in which case they describe the credentials of a bus peer
|
|
identified by the specified bus name, with
|
|
<citerefentry><refentrytitle>sd_bus_get_owner_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
in which case they describe the credentials of the creator of a
|
|
bus, or with
|
|
<citerefentry><refentrytitle>sd_bus_message_get_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
in which case they describe the credentials of the sender of the
|
|
message.</para>
|
|
|
|
<para>Not all credential fields are part of every
|
|
<literal>sd_bus_creds</literal> object. Use
|
|
<citerefentry><refentrytitle>sd_bus_creds_get_mask</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
to determine the mask of fields available.</para>
|
|
|
|
<para><function>sd_bus_creds_get_pid()</function> will retrieve
|
|
the PID (process identifier). Similarly,
|
|
<function>sd_bus_creds_get_ppid()</function> will retrieve the
|
|
parent PID. Note that PID 1 has no parent process, in which case
|
|
-ENXIO is returned.</para>
|
|
|
|
<para><function>sd_bus_creds_get_tid()</function> will retrieve the
|
|
TID (thread identifier).</para>
|
|
|
|
<para><function>sd_bus_creds_get_uid()</function> will retrieve
|
|
the numeric UID (user identifier). Similarly,
|
|
<function>sd_bus_creds_get_euid()</function> returns the effective
|
|
UID, <function>sd_bus_creds_get_suid()</function> the saved UID
|
|
and <function>sd_bus_creds_get_fsuid()</function> the file system
|
|
UID.</para>
|
|
|
|
<para><function>sd_bus_creds_get_gid()</function> will retrieve the
|
|
numeric GID (group identifier). Similarly,
|
|
<function>sd_bus_creds_get_egid()</function> returns the effective
|
|
GID, <function>sd_bus_creds_get_sgid()</function> the saved GID
|
|
and <function>sd_bus_creds_get_fsgid()</function> the file system
|
|
GID.</para>
|
|
|
|
<para><function>sd_bus_creds_get_supplementary_gids()</function>
|
|
will retrieve the supplementary GIDs list.</para>
|
|
|
|
<para><function>sd_bus_creds_get_comm()</function> will retrieve the
|
|
comm field (truncated name of the executable, as stored in
|
|
<filename>/proc/<replaceable>pid</replaceable>/comm</filename>).
|
|
</para>
|
|
|
|
<para><function>sd_bus_creds_get_tid_comm()</function> will retrieve
|
|
the comm field of the thread (as stored in
|
|
<filename>/proc/<replaceable>pid</replaceable>/task/<replaceable>tid</replaceable>/comm</filename>).
|
|
</para>
|
|
|
|
<para><function>sd_bus_creds_get_exe()</function> will retrieve
|
|
the path to the program executable (as stored in the
|
|
<filename>/proc/<replaceable>pid</replaceable>/exe</filename>
|
|
link, but with the <literal> (deleted)</literal> suffix removed). Note
|
|
that kernel threads do not have an executable path, in which case
|
|
-ENXIO is returned.</para>
|
|
|
|
<para><function>sd_bus_creds_get_cmdline()</function> will
|
|
retrieve an array of command line arguments (as stored in
|
|
<filename>/proc/<replaceable>pid</replaceable>/cmdline</filename>). Note
|
|
that kernel threads do not have a command line, in which case
|
|
-ENXIO is returned.</para>
|
|
|
|
<para><function>sd_bus_creds_get_cgroup()</function> will retrieve
|
|
the control group path. See <ulink
|
|
url="https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt">cgroups.txt</ulink>.
|
|
</para>
|
|
|
|
<para><function>sd_bus_creds_get_unit()</function> will retrieve
|
|
the systemd unit name (in the system instance of systemd) that the
|
|
process is a part of. See
|
|
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>. For
|
|
processes that are not part of a unit, returns -ENXIO.
|
|
</para>
|
|
|
|
<para><function>sd_bus_creds_get_user_unit()</function> will
|
|
retrieve the systemd unit name (in the user instance of systemd)
|
|
that the process is a part of. See
|
|
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>. For
|
|
processes that are not part of a user unit, returns -ENXIO.
|
|
</para>
|
|
|
|
<para><function>sd_bus_creds_get_slice()</function> will retrieve
|
|
the systemd slice (a unit in the system instance of systemd) that
|
|
the process is a part of. See
|
|
<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>. Similarly,
|
|
<function>sd_bus_creds_get_user_slice()</function> retrieves the
|
|
systemd slice of the process, in the user instance of systemd.
|
|
</para>
|
|
|
|
<para><function>sd_bus_creds_get_session()</function> will
|
|
retrieve the identifier of the login session that the process is
|
|
a part of. Please note the login session may be limited to a stub
|
|
process or two. User processes may instead be started from their
|
|
systemd user manager, e.g. GUI applications started using DBus
|
|
activation, as well as service processes which are shared between
|
|
multiple logins of the same user. For processes that are not part
|
|
of a session, returns -ENXIO.</para>
|
|
|
|
<para><function>sd_bus_creds_get_owner_uid()</function> will
|
|
retrieve the numeric UID (user identifier) of the user who owns
|
|
the user unit or login session that the process is a part of. See
|
|
<citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
|
|
For processes that are not part of a user unit or session, returns
|
|
-ENXIO.
|
|
</para>
|
|
|
|
<para><function>sd_bus_creds_has_effective_cap()</function> will check whether the capability specified by
|
|
<parameter>capability</parameter> was set in the effective capabilities mask. A positive return value means that it
|
|
was set, zero means that it was not set, and a negative return value indicates an error. See <citerefentry
|
|
project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry> and the
|
|
<varname>AmbientCapabilities=</varname> and <varname>CapabilityBoundingSet=</varname> settings in
|
|
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
|
|
</para>
|
|
|
|
<para><function>sd_bus_creds_has_permitted_cap()</function> is
|
|
similar to <function>sd_bus_creds_has_effective_cap()</function>,
|
|
but will check the permitted capabilities mask.</para>
|
|
|
|
<para><function>sd_bus_creds_has_inheritable_cap()</function> is
|
|
similar to <function>sd_bus_creds_has_effective_cap()</function>,
|
|
but will check the inheritable capabilities mask.</para>
|
|
|
|
<para><function>sd_bus_creds_has_bounding_cap()</function> is
|
|
similar to <function>sd_bus_creds_has_effective_cap()</function>,
|
|
but will check the bounding capabilities mask.</para>
|
|
|
|
<para><function>sd_bus_creds_get_selinux_context()</function> will
|
|
retrieve the SELinux security context (label) of the process.</para>
|
|
|
|
<para><function>sd_bus_creds_get_audit_session_id()</function>
|
|
will retrieve the audit session identifier of the process. Returns
|
|
-ENXIO for processes that are not part of an audit session.</para>
|
|
|
|
<para><function>sd_bus_creds_get_audit_login_uid()</function> will
|
|
retrieve the audit user login identifier (the identifier of the
|
|
user who is "responsible" for the session). Returns -ENXIO for
|
|
processes that are not part of an audit session.</para>
|
|
|
|
<para><function>sd_bus_creds_get_tty()</function> will retrieve
|
|
the controlling TTY, without the prefixing "/dev/". Returns -ENXIO
|
|
for processes that have no controlling TTY.</para>
|
|
|
|
<para><function>sd_bus_creds_get_unique_name()</function> will
|
|
retrieve the D-Bus unique name. See <ulink
|
|
url="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus">The
|
|
D-Bus specification</ulink>.</para>
|
|
|
|
<para><function>sd_bus_creds_get_well_known_names()</function> will
|
|
retrieve the set of D-Bus well-known names. See <ulink
|
|
url="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus">The
|
|
D-Bus specification</ulink>.</para>
|
|
|
|
<para><function>sd_bus_creds_get_description()</function> will
|
|
retrieve a descriptive name of the bus connection of the
|
|
peer. This name is useful to discern multiple bus connections by
|
|
the same peer, and may be altered by the peer with the
|
|
<citerefentry><refentrytitle>sd_bus_set_description</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
call.</para>
|
|
|
|
<para>All functions that take a <parameter>const
|
|
char**</parameter> parameter will store the answer there as an
|
|
address of a NUL-terminated string. It will be valid as long as
|
|
<parameter>c</parameter> remains valid, and should not be freed or
|
|
modified by the caller.</para>
|
|
|
|
<para>All functions that take a <parameter>char***</parameter>
|
|
parameter will store the answer there as an address of an array
|
|
of strings. Each individual string is NUL-terminated, and the
|
|
array is NULL-terminated as a whole. It will be valid as long as
|
|
<parameter>c</parameter> remains valid, and should not be freed or
|
|
modified by the caller.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Return Value</title>
|
|
|
|
<para>On success, these calls return 0 or a positive integer. On
|
|
failure, these calls return a negative errno-style error code.
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Errors</title>
|
|
|
|
<para>Returned errors may indicate the following problems:</para>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><constant>-ENODATA</constant></term>
|
|
|
|
<listitem><para>The given field is not available in the
|
|
credentials object <parameter>c</parameter>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><constant>-ENXIO</constant></term>
|
|
|
|
<listitem><para>The given field is not specified for the described
|
|
process or peer. This will be returned by
|
|
<function>sd_bus_creds_get_unit()</function>,
|
|
<function>sd_bus_creds_get_slice()</function>,
|
|
<function>sd_bus_creds_get_user_unit()</function>,
|
|
<function>sd_bus_creds_get_user_slice()</function>, and
|
|
<function>sd_bus_creds_get_session()</function> if the process is
|
|
not part of a systemd system unit, systemd user unit, systemd
|
|
slice, or logind session. It will be returned by
|
|
<function>sd_bus_creds_get_owner_uid()</function> if the process is
|
|
not part of a systemd user unit or logind session. It will also be
|
|
returned by <function>sd_bus_creds_get_exe()</function> and
|
|
<function>sd_bus_creds_get_cmdline()</function> for kernel
|
|
threads (since these are not started from an executable binary,
|
|
nor have a command line), and by
|
|
<function>sd_bus_creds_get_audit_session_id()</function> and
|
|
<function>sd_bus_creds_get_audit_login_uid()</function> when
|
|
the process is not part of an audit session, and
|
|
<function>sd_bus_creds_get_tty()</function> if the process has
|
|
no controlling TTY.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><constant>-EINVAL</constant></term>
|
|
|
|
<listitem><para>Specified pointer parameter is <constant>NULL</constant>.
|
|
</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><constant>-ENOMEM</constant></term>
|
|
|
|
<listitem><para>Memory allocation failed.</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<xi:include href="libsystemd-pkgconfig.xml" />
|
|
|
|
<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_new_from_pid</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>fork</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>execve</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>credentials</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>proc</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|