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681eb9cf2b
In particular, use /lib/systemd instead of /usr/lib/systemd in distributions like Debian which still have not adopted a /usr merge setup. Use XML entities from man/custom-entities.ent to replace configured paths while doing XSLT processing of the original XML files. There was precedent of some files (such as systemd.generator.xml) which were already using this approach. This addresses most of the (manual) fixes from this patch: http://anonscm.debian.org/cgit/pkg-systemd/systemd.git/tree/debian/patches/Fix-paths-in-man-pages.patch?h=experimental-220 The idea of using generic XML entities was presented here: http://lists.freedesktop.org/archives/systemd-devel/2015-May/032240.html This patch solves almost all the issues, with the exception of: - Path to /bin/mount and /bin/umount. - Generic statements about preference of /lib over /etc. These will be handled separately by follow up patches. Tested: - With default configure settings, ran "make install" to two separate directories and compared the output to confirm they matched exactly. - Used a set of configure flags including $CONFFLAGS from Debian: http://anonscm.debian.org/cgit/pkg-systemd/systemd.git/tree/debian/rules Installed the tree and confirmed the paths use /lib/systemd instead of /usr/lib/systemd and that no other unexpected differences exist. - Confirmed that `make distcheck` still passes.
300 lines
12 KiB
XML
300 lines
12 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
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<!ENTITY % entities SYSTEM "custom-entities.ent" >
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%entities;
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]>
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sd_pid_get_session" conditional='HAVE_PAM'>
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<refentryinfo>
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<title>sd_pid_get_session</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_pid_get_session</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_pid_get_session</refname>
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<refname>sd_pid_get_unit</refname>
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<refname>sd_pid_get_user_unit</refname>
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<refname>sd_pid_get_owner_uid</refname>
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<refname>sd_pid_get_machine_name</refname>
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<refname>sd_pid_get_slice</refname>
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<refname>sd_peer_get_session</refname>
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<refname>sd_peer_get_unit</refname>
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<refname>sd_peer_get_user_unit</refname>
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<refname>sd_peer_get_owner_uid</refname>
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<refname>sd_peer_get_machine_name</refname>
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<refname>sd_peer_get_slice</refname>
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<refpurpose>Determine session, service, owner of a
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session, container/VM or slice of a specific
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PID or socket peer</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_pid_get_session</function></funcdef>
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<paramdef>pid_t <parameter>pid</parameter></paramdef>
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<paramdef>char **<parameter>session</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_pid_get_unit</function></funcdef>
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<paramdef>pid_t <parameter>pid</parameter></paramdef>
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<paramdef>char **<parameter>unit</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_pid_get_user_unit</function></funcdef>
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<paramdef>pid_t <parameter>pid</parameter></paramdef>
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<paramdef>char **<parameter>unit</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_pid_get_owner_uid</function></funcdef>
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<paramdef>pid_t <parameter>pid</parameter></paramdef>
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<paramdef>uid_t *<parameter>uid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_pid_get_machine_name</function></funcdef>
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<paramdef>pid_t <parameter>pid</parameter></paramdef>
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<paramdef>char **<parameter>name</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_pid_get_slice</function></funcdef>
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<paramdef>pid_t <parameter>pid</parameter></paramdef>
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<paramdef>char **<parameter>slice</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_peer_get_session</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>char **<parameter>session</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_peer_get_unit</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>char **<parameter>unit</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_peer_get_user_unit</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>char **<parameter>unit</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_peer_get_owner_uid</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>uid_t *<parameter>uid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_peer_get_machine_name</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>char **<parameter>name</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_peer_get_slice</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>char **<parameter>slice</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_pid_get_session()</function> may be used to
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determine the login session identifier of a process identified by
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the specified process identifier. The session identifier is a
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short string, suitable for usage in file system paths. Note that
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not all processes are part of a login session (e.g. system service
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processes, user processes that are shared between multiple
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sessions of the same user, or kernel threads). For processes not
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being part of a login session this function will fail with
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-ENXIO. The returned string needs to be freed with the libc
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<citerefentry
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project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use.</para>
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<para><function>sd_pid_get_unit()</function> may be used to
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determine the systemd system unit (i.e. system service) identifier
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of a process identified by the specified PID. The unit name is a
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short string, suitable for usage in file system paths. Note that
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not all processes are part of a system unit/service (e.g. user
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processes, or kernel threads). For processes not being part of a
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systemd system unit this function will fail with -ENXIO (More
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specifically: this call will not work for processes that are part
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of user units, use <function>sd_pid_get_user_unit()</function> for
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that.) The returned string needs to be freed with the libc
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<citerefentry
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project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use.</para>
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<para><function>sd_pid_get_user_unit()</function> may be used to
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determine the systemd user unit (i.e. user service) identifier of
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a process identified by the specified PID. This is similar to
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<function>sd_pid_get_unit()</function> but applies to user units
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instead of system units.</para>
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<para><function>sd_pid_get_owner_uid()</function> may be used to
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determine the Unix user identifier of the owner of the session of
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a process identified the specified PID. Note that this function
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will succeed for user processes which are shared between multiple
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login sessions of the same user, where
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<function>sd_pid_get_session()</function> will fail. For processes
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not being part of a login session and not being a shared process
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of a user this function will fail with -ENXIO.</para>
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<para><function>sd_pid_get_machine_name()</function> may be used
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to determine the name of the VM or container is a member of. The
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machine name is a short string, suitable for usage in file system
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paths. The returned string needs to be freed with the libc
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<citerefentry
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project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use. For processes not part of a VM or containers this
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function fails with -ENXIO.</para>
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<para><function>sd_pid_get_slice()</function> may be used to
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determine the slice unit the process is a member of. See
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<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details about slices. The returned string needs to be freed
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with the libc
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<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use.</para>
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<para>If the <varname>pid</varname> parameter of any of these
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functions is passed as 0, the operation is executed for the
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calling process.</para>
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<para>The <function>sd_peer_get_session()</function>,
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<function>sd_peer_get_unit()</function>,
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<function>sd_peer_get_user_unit()</function>,
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<function>sd_peer_get_owner_uid()</function>,
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<function>sd_peer_get_machine_name()</function> and
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<function>sd_peer_get_slice()</function> calls operate similar to
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their PID counterparts, but operate on a connected AF_UNIX socket
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and retrieve information about the connected peer process.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On success, these calls return 0 or a positive integer. On
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failure, these calls return a negative errno-style error
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code.</para>
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</refsect1>
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<refsect1>
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<title>Errors</title>
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<para>Returned errors may indicate the following problems:</para>
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<variablelist>
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<varlistentry>
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<term><constant>-ENXIO</constant></term>
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<listitem><para>Given field is not specified for the described
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process or peer.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ESRCH</constant></term>
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<listitem><para>The specified PID does not refer to a running
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process.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENOMEM</constant></term>
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<listitem><para>Memory allocation failed.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>The <function>sd_pid_get_session()</function>,
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<function>sd_pid_get_unit()</function>,
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<function>sd_pid_get_user_unit()</function>,
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<function>sd_pid_get_owner_uid()</function>,
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<function>sd_pid_get_machine_name()</function>,
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<function>sd_pid_get_slice()</function>,
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<function>sd_peer_get_session()</function>,
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<function>sd_peer_get_unit()</function>,
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<function>sd_peer_get_user_unit()</function>,
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<function>sd_peer_get_owner_uid()</function>,
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<function>sd_peer_get_machine_name()</function> and
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<function>sd_peer_get_slice()</function> interfaces are
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available as a shared library, which can be compiled
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and linked to with the
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<constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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file.</para>
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<para>Note that the login session identifier as
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returned by <function>sd_pid_get_session()</function>
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is completely unrelated to the process session
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identifier as returned by
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<citerefentry><refentrytitle>getsid</refentrytitle><manvolnum>2</manvolnum></citerefentry>.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_session_is_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>getsid</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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