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12b42c7667
This did not really work out as we had hoped. Trying to do this upstream introduced several problems that probably makes it better suited as a downstream patch after all. At any rate, it is not releaseable in the current state, so we at least need to revert this before the release. * by adjusting the path to binaries, but not do the same thing to the search path we end up with inconsistent man-pages. Adjusting the search path too would be quite messy, and it is not at all obvious that this is worth the effort, but at any rate it would have to be done before we could ship this. * this means that distributed man-pages does not make sense as they depend on config options, and for better or worse we are still distributing man pages, so that is something that definitely needs sorting out before we could ship with this patch. * we have long held that split-usr is only minimally supported in order to boot, and something we hope will eventually go away. So before we start adding even more magic/effort in order to make this work nicely, we should probably question if it makes sense at all.
416 lines
16 KiB
XML
416 lines
16 KiB
XML
<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
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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_error">
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<refentryinfo>
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<title>sd_bus_error</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_error</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_error</refname>
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<refname>sd_bus_error_free</refname>
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<refname>sd_bus_error_set</refname>
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<refname>sd_bus_error_set_const</refname>
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<refname>sd_bus_error_set_errno</refname>
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<refname>sd_bus_error_set_errnof</refname>
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<refname>sd_bus_error_get_errno</refname>
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<refname>sd_bus_error_copy</refname>
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<refname>sd_bus_error_is_set</refname>
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<refname>sd_bus_error_has_name</refname>
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<refpurpose>sd-bus error handling</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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<funcsynopsisinfo>typedef struct {
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const char *name;
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const char *message;
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...
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} sd_bus_error;</funcsynopsisinfo>
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<para>
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<constant>SD_BUS_ERROR_MAKE_CONST(<replaceable>name</replaceable>, <replaceable>message</replaceable>)</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_NULL</constant>
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</para>
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<funcprototype>
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<funcdef>int <function>sd_bus_error_free</function></funcdef>
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<paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_error_set</function></funcdef>
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<paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
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<paramdef>const char *<parameter>name</parameter></paramdef>
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<paramdef>const char *<parameter>message</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_error_setf</function></funcdef>
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<paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
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<paramdef>const char *<parameter>name</parameter></paramdef>
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<paramdef>const char *<parameter>format</parameter></paramdef>
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<paramdef>...</paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_error_set_const</function></funcdef>
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<paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
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<paramdef>const char *<parameter>name</parameter></paramdef>
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<paramdef>const char *<parameter>message</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_error_set_errno</function></funcdef>
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<paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
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<paramdef>int <parameter>error</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_error_set_errnof</function></funcdef>
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<paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
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<paramdef>int <parameter>error</parameter></paramdef>
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<paramdef>const char *<parameter>format</parameter></paramdef>
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<paramdef>...</paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_error_get_errno</function></funcdef>
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<paramdef>const sd_bus_error *<parameter>e</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_error_copy</function></funcdef>
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<paramdef>sd_bus_error *<parameter>dst</parameter></paramdef>
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<paramdef>const sd_bus_error *<parameter>e</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_error_is_set</function></funcdef>
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<paramdef>const sd_bus_error *<parameter>e</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_error_has_name</function></funcdef>
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<paramdef>const sd_bus_error *<parameter>e</parameter></paramdef>
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<paramdef>const char *<parameter>name</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<para>
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<constant>SD_BUS_ERROR_FAILED</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_NO_MEMORY</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_SERVICE_UNKNOWN</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_NAME_HAS_NO_OWNER</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_NO_REPLY</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_IO_ERROR</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_BAD_ADDRESS</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_NOT_SUPPORTED</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_LIMITS_EXCEEDED</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_ACCESS_DENIED</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_AUTH_FAILED</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_NO_SERVER</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_TIMEOUT</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_NO_NETWORK</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_ADDRESS_IN_USE</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_DISCONNECTED</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_INVALID_ARGS</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_FILE_NOT_FOUND</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_FILE_EXISTS</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_UNKNOWN_METHOD</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_UNKNOWN_OBJECT</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_UNKNOWN_INTERFACE</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_UNKNOWN_PROPERTY</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_PROPERTY_READ_ONLY</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_INVALID_SIGNATURE</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_INCONSISTENT_MESSAGE</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_MATCH_RULE_NOT_FOUND</constant>
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</para>
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<para>
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<constant>SD_BUS_ERROR_MATCH_RULE_INVALID</constant>
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</para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>The <structname>sd_bus_error</structname> structure carries
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information for a <filename>sd-bus</filename> error. The
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functions described below can be used to set and query fields in
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this structure. The <structfield>name</structfield> field contains a
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short identifier of an error. It should follow the rules for error
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names described in the D-Bus specification, subsection <ulink
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url="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names">Valid
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Names</ulink>. The <structfield>message</structfield> is a human
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readable string describing the details. When no longer necessary,
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resources held by this structure should be destroyed with
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<function>sd_bus_error_free</function>.</para>
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<para><function>sd_bus_error_set</function> will return an
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errno-like negative value returned based on parameter
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<parameter>name</parameter> (see
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<citerefentry project='man-pages'><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>).
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Various well-known D-Bus errors are converted to specific values,
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and the remaining ones to <constant>-ENXIO</constant>. Well-known
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D-Bus error names are available as constants
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<constant>SD_BUS_ERROR_FAILED</constant>, etc., listed above. If
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<parameter>name</parameter> is <constant>NULL</constant>, it is
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assumed that no error occurred, and 0 is returned. This means that
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this function may be conveniently used in a
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<function>return</function> statement.</para>
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<para>If <parameter>e</parameter> is not
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<constant>NULL</constant>, <structfield>name</structfield> and
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<structfield>message</structfield> in the
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<structname>sd_bus_error</structname> structure
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<parameter>e</parameter> points at will be filled in. As described above,
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<parameter>name</parameter> may be <constant>NULL</constant>,
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which is treated as no error. Parameter
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<parameter>message</parameter> may also be
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<constant>NULL</constant>, in which case no message is specified.
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<function>sd_bus_error_set</function> will make internal copies of
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specified strings.</para>
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<para><function>sd_bus_error_setf</function> is similar to
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<function>sd_bus_error_set</function>, but takes a
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<citerefentry project='man-pages'><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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format string and corresponding arguments to generate
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<structname>message</structname>.</para>
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<para><function>sd_bus_error_set_const</function> is similar to
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<function>sd_bus_error_set</function>, but string parameters are
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not copied internally, and must remain valid for the lifetime of
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<parameter>e</parameter>.</para>
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<para><function>sd_bus_error_set_errno</function> will set
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<structfield>name</structfield> based on an errno-like value.
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<citerefentry project='die-net'><refentrytitle>strerror</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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will be used to set <structfield>message</structfield>. Well-known
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D-Bus error names will be used for <structfield>name</structfield>
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if available, otherwise a name in the
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<literal>System.Error</literal> namespace will be generated.
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</para>
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<para><function>sd_bus_error_set_errnof</function> is similar to
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<function>sd_bus_error_set_errno</function>, but in addition to
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<parameter>name</parameter>, takes a
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<citerefentry project='man-pages'><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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format and corresponding arguments.
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<structfield>name</structfield> will be generated from
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<parameter>format</parameter> and the arguments.</para>
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<para><function>sd_bus_error_get_errno</function> will convert
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<structname>e->name</structname> to an errno-like value using the
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same rules as <function>sd_bus_error_set</function>. If
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<parameter>e</parameter> is <constant>NULL</constant>, 0 will be
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returned.</para>
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<para><function>sd_bus_error_copy</function> will initialize
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<parameter>dst</parameter> using the values in
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<parameter>e</parameter>. If the strings in
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<parameter>e</parameter> were set using
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<function>sd_bus_set_error_const</function>, they will be shared.
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Otherwise, they will be copied.</para>
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<para><function>sd_bus_error_is_set</function> will return
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<constant>true</constant> if <parameter>e</parameter> is
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non-<constant>NULL</constant> and an error has been set,
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<constant>false</constant> otherwise.</para>
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<para><function>sd_bus_error_has_name</function> will return true
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if <parameter>e</parameter> is non-<constant>NULL</constant> and
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an error with the same <parameter>name</parameter> has been set,
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<constant>false</constant> otherwise.</para>
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<para><function>sd_bus_error_free</function> will destroy resources
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held by <parameter>e</parameter>. The parameter itself will not
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be deallocated, and must be
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<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>d
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by the caller if necessary.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>Functions <function>sd_bus_error_set</function>,
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<function>sd_bus_error_setf</function>,
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<function>sd_bus_error_set_const</function>, when successful,
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return the negative errno value corresponding to the
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<parameter>name</parameter> parameter. Functions
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<function>sd_bus_error_set_errno</function> and
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<function>sd_bus_error_set_errnof</function>, when successful,
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return the value of the <parameter>errno</parameter> parameter. If
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an error occurs, one of the negative error values listed below
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will be returned.</para>
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<para><function>sd_bus_error_get_errno</function> returns
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<constant>false</constant> when <parameter>e</parameter> is
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<constant>NULL</constant>, and a positive errno value mapped from
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<parameter>e->name</parameter> otherwise.</para>
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<para><function>sd_bus_error_copy</function> returns 0 or a
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positive integer on success, and one of the negative error values
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listed below otherwise.</para>
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<para><function>sd_bus_error_is_set</function> returns
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<constant>true</constant> when <parameter>e</parameter> and
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<parameter>e->name</parameter> are non-<constant>NULL</constant>,
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<constant>false</constant> otherwise.</para>
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<para><function>sd_bus_error_has_name</function> returns
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<constant>true</constant> when <parameter>e</parameter> is
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non-<constant>NULL</constant> and <parameter>e->name</parameter>
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is equal to <parameter>name</parameter>,
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<constant>false</constant> otherwise.</para>
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</refsect1>
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<refsect1>
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<title>Reference ownership</title>
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<para><structname>sd_bus_error</structname> is not reference
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counted. Users should destroy resources held by it by calling
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<function>sd_bus_error_free</function>.</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>-EINVAL</constant></term>
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<listitem><para>Error was already set in
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<structname>sd_bus_error</structname> structure when one the
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error-setting functions was called.</para></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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||
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<para><function>sd_bus_set_error()</function> and other functions
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described here are available as a shared library, which can be
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compiled 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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</refsect1>
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||
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||
<refsect1>
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||
<title>See Also</title>
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||
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||
<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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||
<citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
||
<citerefentry project='man-pages'><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
||
<citerefentry project='die-net'><refentrytitle>strerror</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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||
</para>
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||
</refsect1>
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</refentry>
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