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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 13:00:47 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 13:00:47 +0000
commit2cb7e0aaedad73b076ea18c6900b0e86c5760d79 (patch)
treeda68ca54bb79f4080079bf0828acda937593a4e1 /man/sd_bus_error.xml
parentInitial commit. (diff)
downloadsystemd-2cb7e0aaedad73b076ea18c6900b0e86c5760d79.tar.xz
systemd-2cb7e0aaedad73b076ea18c6900b0e86c5760d79.zip
Adding upstream version 247.3.upstream/247.3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="sd_bus_error" xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>sd_bus_error</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_bus_error</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_bus_error</refname>
+ <refname>SD_BUS_ERROR_MAKE_CONST</refname>
+ <refname>SD_BUS_ERROR_NULL</refname>
+ <refname>sd_bus_error_free</refname>
+ <refname>sd_bus_error_set</refname>
+ <refname>sd_bus_error_setf</refname>
+ <refname>sd_bus_error_set_const</refname>
+ <refname>sd_bus_error_set_errno</refname>
+ <refname>sd_bus_error_set_errnof</refname>
+ <refname>sd_bus_error_set_errnofv</refname>
+ <refname>sd_bus_error_get_errno</refname>
+ <refname>sd_bus_error_copy</refname>
+ <refname>sd_bus_error_move</refname>
+ <refname>sd_bus_error_is_set</refname>
+ <refname>sd_bus_error_has_name</refname>
+ <refname>sd_bus_error_has_names_sentinel</refname>
+ <refname>sd_bus_error_has_names</refname>
+
+ <refpurpose>sd-bus error handling</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+
+ <funcsynopsisinfo>typedef struct {
+ const char *name;
+ const char *message;
+ …
+} sd_bus_error;</funcsynopsisinfo>
+
+ <para>
+ <constant>SD_BUS_ERROR_MAKE_CONST(<replaceable>name</replaceable>, <replaceable>message</replaceable>)</constant>
+ </para>
+ <para>
+ <constant>SD_BUS_ERROR_NULL</constant>
+ </para>
+
+ <funcprototype>
+ <funcdef>void <function>sd_bus_error_free</function></funcdef>
+ <paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_error_set</function></funcdef>
+ <paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
+ <paramdef>const char *<parameter>name</parameter></paramdef>
+ <paramdef>const char *<parameter>message</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_error_setf</function></funcdef>
+ <paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
+ <paramdef>const char *<parameter>name</parameter></paramdef>
+ <paramdef>const char *<parameter>format</parameter></paramdef>
+ <paramdef>…</paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_error_set_const</function></funcdef>
+ <paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
+ <paramdef>const char *<parameter>name</parameter></paramdef>
+ <paramdef>const char *<parameter>message</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_error_set_errno</function></funcdef>
+ <paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
+ <paramdef>int <parameter>error</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_error_set_errnof</function></funcdef>
+ <paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
+ <paramdef>int <parameter>error</parameter></paramdef>
+ <paramdef>const char *<parameter>format</parameter></paramdef>
+ <paramdef>…</paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_error_set_errnofv</function></funcdef>
+ <paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
+ <paramdef>int <parameter>error</parameter></paramdef>
+ <paramdef>const char *<parameter>format</parameter></paramdef>
+ <paramdef>va_list <parameter>ap</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_error_get_errno</function></funcdef>
+ <paramdef>const sd_bus_error *<parameter>e</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_error_copy</function></funcdef>
+ <paramdef>sd_bus_error *<parameter>dst</parameter></paramdef>
+ <paramdef>const sd_bus_error *<parameter>e</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_error_move</function></funcdef>
+ <paramdef>sd_bus_error *<parameter>dst</parameter></paramdef>
+ <paramdef>sd_bus_error *<parameter>e</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_error_is_set</function></funcdef>
+ <paramdef>const sd_bus_error *<parameter>e</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_error_has_name</function></funcdef>
+ <paramdef>const sd_bus_error *<parameter>e</parameter></paramdef>
+ <paramdef>const char *<parameter>name</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_error_has_names_sentinel</function></funcdef>
+ <paramdef>const sd_bus_error *<parameter>e</parameter></paramdef>
+ <paramdef>...</paramdef>
+ </funcprototype>
+
+ <para>
+ &#35;define sd_bus_error_has_names(e, ...) sd_bus_error_has_names_sentinel(e, ..., NULL)
+ </para>
+ </funcsynopsis>
+
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para>The <structname>sd_bus_error</structname> structure carries
+ information about a D-Bus error condition. The functions described
+ below may be used to set and query fields in this structure. The
+ <structfield>name</structfield> field contains a short identifier
+ of an error. It should follow the rules for error names described
+ in the D-Bus specification, subsection <ulink
+ url="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names">Valid
+ Names</ulink>. A number of common, standardized error names are
+ described in
+ <citerefentry><refentrytitle>sd-bus-errors</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ but additional domain-specific errors may be defined by
+ applications. The <structfield>message</structfield> field usually
+ contains a human-readable string describing the details, but might
+ be <constant>NULL</constant>. An unset <structname>sd_bus_error</structname> structure
+ should have both fields initialized to <constant>NULL</constant>. Set an error
+ structure to <constant>SD_BUS_ERROR_NULL</constant> in order to
+ reset both fields to <constant>NULL</constant>. When no longer necessary, resources
+ held by the <structname>sd_bus_error</structname> structure should
+ be destroyed with <function>sd_bus_error_free()</function>.</para>
+
+ <para><function>sd_bus_error_set()</function> sets an error
+ structure to the specified name and message strings. The strings
+ will be copied into internal, newly allocated memory. It is
+ essential to free the error structure again when it is not
+ required anymore (see above). The function will return an
+ <varname>errno</varname>-like negative value (see <citerefentry
+ project='man-pages'><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>)
+ determined from the specified error name. Various well-known
+ D-Bus errors are converted to well-known <varname>errno</varname>
+ counterparts, and the other ones to <constant>-EIO</constant>. See
+ <citerefentry><refentrytitle>sd-bus-errors</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ for a list of well-known error names. Additional error mappings
+ may be defined with
+ <citerefentry><refentrytitle>sd_bus_error_add_map</refentrytitle><manvolnum>3</manvolnum></citerefentry>. If
+ <parameter>e</parameter> is <constant>NULL</constant>, no error structure is initialized,
+ but the error is still converted into an
+ <varname>errno</varname>-style error. If
+ <parameter>name</parameter> is <constant>NULL</constant>, it is
+ assumed that no error occurred, and 0 is returned. This means that
+ this function may be conveniently used in a
+ <function>return</function> statement. If
+ <parameter>message</parameter> is <constant>NULL</constant>, no message is set. This
+ call can fail if no memory may be allocated for the name and
+ message strings, in which case an
+ <constant>SD_BUS_ERROR_NO_MEMORY</constant> error might be set
+ instead and -ENOMEM be returned. Do not use this call on error
+ structures that are already initialized. If you intend to reuse an
+ error structure, free the old data stored in it with
+ <function>sd_bus_error_free()</function> first.</para>
+
+ <para><function>sd_bus_error_setf()</function> is similar to
+ <function>sd_bus_error_set()</function>, but takes a <citerefentry
+ project='man-pages'><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ format string and corresponding arguments to generate the
+ <structfield>message</structfield> field.</para>
+
+ <para><function>sd_bus_error_set_const()</function> is similar to
+ <function>sd_bus_error_set()</function>, but the string parameters
+ are not copied internally, and must hence remain constant and
+ valid for the lifetime of <parameter>e</parameter>. Use this call
+ to avoid memory allocations when setting error structures. Since
+ this call does not allocate memory, it will not fail with an
+ out-of-memory condition as
+ <function>sd_bus_error_set()</function> can, as described
+ above. Alternatively, the
+ <constant>SD_BUS_ERROR_MAKE_CONST()</constant> macro may be used
+ to generate a literal, constant bus error structure
+ on-the-fly.</para>
+
+ <para><function>sd_bus_error_set_errno()</function> will set
+ <structfield>name</structfield> from an
+ <varname>errno</varname>-like value that is converted to a D-Bus
+ error. <citerefentry
+ project='die-net'><refentrytitle>strerror_r</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ will be used to set <structfield>message</structfield>. Well-known
+ D-Bus error names will be used for <structfield>name</structfield>
+ if applicable, otherwise a name in the
+ <literal>System.Error.</literal> namespace will be generated. The
+ sign of the specified error number is ignored. The absolute value
+ is used implicitly. The call always returns a negative value, for
+ convenient usage in <function>return</function> statements. This
+ call might fail due to lack of memory, in which case an
+ <constant>SD_BUS_ERROR_NO_MEMORY</constant> error is set instead,
+ and -ENOMEM is returned.</para>
+
+ <para><function>sd_bus_error_set_errnof()</function> is similar to
+ <function>sd_bus_error_set_errno()</function>, but in addition to
+ <parameter>error</parameter>, takes a <citerefentry
+ project='man-pages'><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ format string and corresponding arguments. The
+ <structfield>message</structfield> field will be generated from
+ <parameter>format</parameter> and the arguments.</para>
+
+ <para><function>sd_bus_error_set_errnofv()</function> is similar to
+ <function>sd_bus_error_set_errnof()</function>, but takes the
+ format string parameters as <citerefentry
+ project='man-pages'><refentrytitle>va_arg</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ parameter list.</para>
+
+ <para><function>sd_bus_error_get_errno()</function> converts the
+ <structfield>name</structfield> field of an error structure to an
+ <varname>errno</varname>-like (positive) value using the same
+ rules as <function>sd_bus_error_set()</function>. If
+ <parameter>e</parameter> is <constant>NULL</constant>, 0 will be
+ returned.</para>
+
+ <para><function>sd_bus_error_copy()</function> will initialize
+ <parameter>dst</parameter> using the values in
+ <parameter>e</parameter>. If the strings in
+ <parameter>e</parameter> were set using
+ <function>sd_bus_error_set_const()</function>, they will be shared.
+ Otherwise, they will be copied. Returns a converted
+ <varname>errno</varname>-like, negative error code.</para>
+
+ <para><function>sd_bus_error_move()</function> is similar to <function>sd_bus_error_copy()</function>, but will
+ move any error information from <parameter>e</parameter> into <parameter>dst</parameter>, resetting the
+ former. This function cannot fail, as no new memory is allocated. Note that if <parameter>e</parameter> is not set
+ (or <constant>NULL</constant>) <parameter>dst</parameter> is initializated to
+ <constant>SD_BUS_ERROR_NULL</constant>. Moreover, if <parameter>dst</parameter> is <constant>NULL</constant> no
+ operation is executed on it and and resources held by <parameter>e</parameter> are freed and reset. Returns a
+ converted <varname>errno</varname>-like, negative error code.</para>
+
+ <para><function>sd_bus_error_is_set()</function> will return a
+ non-zero value if <parameter>e</parameter> is
+ non-<constant>NULL</constant> and an error has been set,
+ <constant>false</constant> otherwise.</para>
+
+ <para><function>sd_bus_error_has_name()</function> will return a
+ non-zero value if <parameter>e</parameter> is
+ non-<constant>NULL</constant> and an error with the same
+ <parameter>name</parameter> has been set,
+ <constant>false</constant> otherwise.</para>
+
+ <para><function>sd_bus_error_has_names_sentinel()</function> is similar to
+ <function>sd_bus_error_has_name()</function>, but takes multiple names to check against. The list must be
+ terminated with <constant>NULL</constant>. <function>sd_bus_error_has_names()</function>
+ is a macro wrapper around <function>sd_bus_error_has_names_sentinel()</function> that adds the
+ <constant>NULL</constant> sentinel automatically.</para>
+
+ <para><function>sd_bus_error_free()</function> will destroy
+ resources held by <parameter>e</parameter>. The parameter itself
+ will not be deallocated, and must be <citerefentry
+ project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>d
+ by the caller if necessary. The function may also be called safely
+ on unset errors (error structures with both fields set to <constant>NULL</constant>),
+ in which case it performs no operation. This call will reset the
+ error structure after freeing the data, so that all fields are set
+ to <constant>NULL</constant>. The structure may be reused afterwards.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>The functions <function>sd_bus_error_set()</function>,
+ <function>sd_bus_error_setf()</function>, and
+ <function>sd_bus_error_set_const()</function>, when successful,
+ return the negative errno value corresponding to the
+ <parameter>name</parameter> parameter. The functions
+ <function>sd_bus_error_set_errno()</function>,
+ <function>sd_bus_error_set_errnof()</function> and
+ <function>sd_bus_error_set_errnofv()</function>, when successful,
+ return the negative value of the <parameter>error</parameter>
+ parameter. If an error occurs, one of the negative error values
+ listed below will be returned.</para>
+
+ <para><function>sd_bus_error_get_errno()</function> returns
+ <constant>false</constant> when <parameter>e</parameter> is
+ <constant>NULL</constant>, and a positive errno value mapped from
+ <parameter>e-&gt;name</parameter> otherwise.</para>
+
+ <para><function>sd_bus_error_copy()</function> and <function>sd_bus_error_move()</function> return 0 or a positive
+ integer on success, and a negative error value converted from the error name otherwise.</para>
+
+ <para><function>sd_bus_error_is_set()</function> returns a
+ non-zero value when <parameter>e</parameter> and the
+ <structfield>name</structfield> field are
+ non-<constant>NULL</constant>, zero otherwise.</para>
+
+ <para><function>sd_bus_error_has_name()</function>, <function>sd_bus_error_has_names()</function>, and
+ <function>sd_bus_error_has_names_sentinel()</function> return a non-zero value when <parameter>e</parameter> is
+ non-<constant>NULL</constant> and the <structfield>name</structfield> field is equal to one of the given
+ names, zero otherwise.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Reference ownership</title>
+ <para><structname>sd_bus_error</structname> is not reference
+ counted. Users should destroy resources held by it by calling
+ <function>sd_bus_error_free()</function>. Usually, error structures
+ are allocated on the stack or passed in as function parameters,
+ but they may also be allocated dynamically, in which case it is
+ the duty of the caller to <citerefentry
+ project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ the memory held by the structure itself after freeing its contents
+ with <function>sd_bus_error_free()</function>.</para>
+
+ <refsect2>
+ <title>Errors</title>
+
+ <para>Returned errors may indicate the following problems:</para>
+
+ <variablelist>
+
+ <varlistentry>
+ <term><constant>-EINVAL</constant></term>
+
+ <listitem><para>Error was already set in <structname>sd_bus_error</structname> structure when one
+ the error-setting functions was called.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>-ENOMEM</constant></term>
+
+ <listitem><para>Memory allocation failed.</para></listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect2>
+ </refsect1>
+
+ <xi:include href="libsystemd-pkgconfig.xml" />
+
+ <refsect1>
+ <title>See Also</title>
+
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd-bus-errors</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_bus_error_add_map</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry project='man-pages'><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry project='die-net'><refentrytitle>strerror_r</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>