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5aded36978
It is annoying when we have dead links on fd.o. Add project='man-pages|die-net|archlinux' to <citerefentry>-ies. In generated html, add external links to http://man7.org/linux/man-pages/man, http://linux.die.net/man/, https://www.archlinux.org/. By default, pages in sections 2 and 4 go to man7, since Michael Kerrisk is the autorative source on kernel related stuff. The rest of links goes to linux.die.net, because they have the manpages. Except for the pacman stuff, since it seems to be only available from archlinux.org. Poor gummiboot gets no link, because gummitboot(8) ain't to be found on the net. According to common wisdom, that would mean that it does not exist. But I have seen Kay using it, so I know it does, and deserves to be found. Can somebody be nice and put it up somewhere?
454 lines
19 KiB
XML
454 lines
19 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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<!--
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This file is part of systemd.
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Copyright 2014 Zbigniew Jędrzejewski-Szmek
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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_bus_creds_get_pid" conditional="ENABLE_KDBUS">
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<refentryinfo>
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<title>sd_bus_creds_get_pid</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>A monkey with a typewriter</contrib>
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<firstname>Zbigniew</firstname>
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<surname>Jędrzejewski-Szmek</surname>
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<email>zbyszek@in.waw.pl</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_bus_creds_get_pid</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_bus_creds_get_pid</refname>
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<refname>sd_bus_creds_get_pid_starttime</refname>
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<refname>sd_bus_creds_get_tid</refname>
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<refname>sd_bus_creds_get_uid</refname>
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<refname>sd_bus_creds_get_gid</refname>
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<refname>sd_bus_creds_get_comm</refname>
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<refname>sd_bus_creds_get_tid_comm</refname>
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<refname>sd_bus_creds_get_exe</refname>
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<refname>sd_bus_creds_get_cmdline</refname>
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<refname>sd_bus_creds_get_cgroup</refname>
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<refname>sd_bus_creds_get_unit</refname>
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<refname>sd_bus_creds_get_user_unit</refname>
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<refname>sd_bus_creds_get_slice</refname>
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<refname>sd_bus_creds_get_session</refname>
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<refname>sd_bus_creds_get_owner_uid</refname>
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<refname>sd_bus_creds_has_effective_cap</refname>
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<refname>sd_bus_creds_has_permitted_cap</refname>
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<refname>sd_bus_creds_has_inheritable_cap</refname>
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<refname>sd_bus_creds_has_bounding_cap</refname>
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<refname>sd_bus_creds_get_selinux_context</refname>
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<refname>sd_bus_creds_get_audit_session_id</refname>
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<refname>sd_bus_creds_get_audit_login_uid</refname>
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<refname>sd_bus_creds_get_unique_name</refname>
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<refname>sd_bus_creds_get_well_known_names</refname>
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<refpurpose>Retrieve fields from a credentials object</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_pid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>pid_t *<parameter>pid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_pid_starttime</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>uint64_t *<parameter>usec</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_tid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>pid_t *<parameter>tid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_pid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</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_bus_creds_get_gid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>gid_t *<parameter>gid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_comm</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>const char **<parameter>comm</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_tid_comm</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>const char **<parameter>comm</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_exe</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>const char **<parameter>exe</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_cmdline</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>char ***<parameter>cmdline</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_cgroup</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>const char **<parameter>cgroup</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_unit</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>const char **<parameter>unit</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_user_unit</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>const char **<parameter>unit</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_slice</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>const char **<parameter>slice</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_session</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>const char **<parameter>slice</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_owner_uid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</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_bus_creds_has_effective_cap</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>int <parameter>capability</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_has_permitted_cap</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>int <parameter>capability</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_has_inheritable_cap</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>int <parameter>capability</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_has_bounding_cap</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>int <parameter>capability</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_selinux_context</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>const char **<parameter>context</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_audit_session_id</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>uint32_t *<parameter>sessionid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_audit_login_uid</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>uid_t *<parameter>loginuid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_unique_name</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>const char **<parameter>name</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_creds_get_well_known_names</function></funcdef>
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<paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
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<paramdef>char ***<parameter>name</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>These functions return information from an
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<parameter>sd_bus_creds</parameter> object. It may be created with
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<citerefentry><refentrytitle>sd_bus_creds_new_from_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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in which case it will describe the specified process, or it may be
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created by
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<citerefentry><refentrytitle>sd_bus_get_peer_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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in which case it will describe the process at the other endpoint
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of a connection.
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</para>
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<para><function>sd_bus_creds_get_pid</function> will retrieve the
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PID (process identifier).</para>
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<para><function>sd_bus_creds_get_pid_starttime</function> will
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retrieve the time since the start of the epoch in microseconds
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since the process was started.</para>
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<para><function>sd_bus_creds_get_tid</function> will retrieve the
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TID (thread identifier).</para>
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<para><function>sd_bus_creds_get_uid</function> will retrieve the
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numeric UID (user identifier).</para>
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<para><function>sd_bus_creds_get_gid</function> will retrieve the
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numeric GID (group identifier).</para>
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<para><function>sd_bus_creds_get_comm</function> will retrieve the
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comm field (truncated name of the executable, as stored in
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<filename>/proc/<replaceable>pid</replaceable>/comm</filename>).
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</para>
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<para><function>sd_bus_creds_get_tid_comm</function> will retrieve
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the comm field of the thread (as stored in
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<filename>/proc/<replaceable>pid</replaceable>/task/<replaceable>tid</replaceable>/comm</filename>).
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</para>
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<para><function>sd_bus_creds_get_exe</function> will retrieve the
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path to the program (as stored in the
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<filename>/proc/<replaceable>pid</replaceable>/exe</filename>
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link, but with <literal> (deleted)</literal> suffix removed).
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</para>
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<para><function>sd_bus_creds_get_cmdline</function> will retrieve
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an array of command-line arguments (as stored in
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<filename>/proc/<replaceable>pid</replaceable>/cmdline</filename>).
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</para>
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<para><function>sd_bus_creds_get_cgroup</function> will retrieve
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the cgroup path. See <ulink
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url="https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt">cgroups.txt</ulink>.
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</para>
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<para><function>sd_bus_creds_get_unit</function> will retrieve the
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systemd unit name (in the system instance of systemd) that the
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process is part of. See
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<para><function>sd_bus_creds_get_user_unit</function> will
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retrieve the systemd unit name (in the user instance of systemd)
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that the process is part of. See
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<para><function>sd_bus_creds_get_slice</function> will retrieve
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the systemd slice (a unit in the system instance of systemd) that
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the process is part of. See
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<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<para><function>sd_bus_creds_get_session</function> will retrieve
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the logind session that the process is part of. See
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<citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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</para>
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<para><function>sd_bus_creds_get_owner_uid</function> will retrieve
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the numeric UID (user identifier) of the user who owns the slice
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that the process is part of. See
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<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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<!-- and
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<citerefentry><refentrytitle>systemd-user-sessions.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> -->.
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</para>
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<para><function>sd_bus_creds_has_effective_cap</function> will
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check whether the capability specified by
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<parameter>capability</parameter> was set in the effective
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capabilities mask. A positive return value means that is was
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set, zero means that it was not set, and a negative return
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value signifies an error. See
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<citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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and <varname>Capabilities=</varname> and
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<varname>CapabilityBoundingSet=</varname> settings in
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<para><function>sd_bus_creds_has_permitted_cap</function> is
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similar to <function>sd_bus_creds_has_effective_cap</function>,
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but will check the permitted capabilities mask.</para>
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<para><function>sd_bus_creds_has_inheritable_cap</function> is
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similar to <function>sd_bus_creds_has_effective_cap</function>,
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but will check the inheritable capabilities mask.</para>
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<para><function>sd_bus_creds_has_bounding_cap</function> is
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similar to <function>sd_bus_creds_has_effective_cap</function>,
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but will check the bounding capabilities mask.</para>
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<para><function>sd_bus_creds_get_selinux_context</function> will
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retrieve the SELinux security context (label) of the process.</para>
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<para><function>sd_bus_creds_get_audit_session_id</function> will
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retrieve the audit session identifier of the process.</para>
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<para><function>sd_bus_creds_get_audit_login_uid</function> will
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retrieve the audit user login identifier (the identifier of the
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user who is "responsible" for the session).</para>
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<para><function>sd_bus_creds_get_unique_name</function> will
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retrieve the D-Bus unique name. See <ulink
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url="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus">The
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D-Bus specification</ulink>.</para>
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<para><function>sd_bus_creds_get_well_known_names</function> will
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retrieve the set of D-Bus well-known names. See <ulink
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url="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus">The
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D-Bus specification</ulink>.</para>
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<para>All functions that take a <parameter>const
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char**</parameter> parameter will store the answer there as an
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address of a NUL-terminated string. It will be valid as long as
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<parameter>c</parameter> remains valid, and should not be freed or
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modified by the caller.</para>
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<para>All functions that take a <parameter>char***</parameter>
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parameter will store the answer there as an address of a an array
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of strings. Each invidividual string is NUL-terminated, and the
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array is NULL-terminated as a whole. It will be valid as long as
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<parameter>c</parameter> remains valid, and should not be freed or
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modified by the caller.</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 code.
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</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><varname>-ENODATA</varname></term>
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<listitem><para>Given field is not available in
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<parameter>c</parameter>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>-ENOENT</varname></term>
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<listitem><para>Given field is not specified for the sender.
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This will be returned by <function>sd_bus_get_unit</function>,
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<function>sd_bus_get_user_unit</function>,
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<function>sd_bus_get_slice</function>,
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<function>sd_bus_get_session</function>, and
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<function>sd_bus_get_owner_uid</function> if the sender is not
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part of a systemd system unit, systemd user unit, systemd
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slice, logind session, or a systemd user session.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>-ENXIO</varname></term>
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|
||
<listitem><para>An error occured in parsing cgroup paths.
|
||
<filename>libsystemd</filename> might be out of sync with
|
||
the running systemd version.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>-EINVAL</varname></term>
|
||
|
||
<listitem><para>Specified pointer parameter is <constant>NULL</constant>.
|
||
</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_open_user()</function> and other functions
|
||
described here are 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>fork</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
|
||
<citerefentry><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.journald-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>
|
||
</para>
|
||
</refsect1>
|
||
|
||
</refentry>
|