diff options
author | Sven Eden <yamakuzure@gmx.net> | 2017-12-12 07:54:16 +0100 |
---|---|---|
committer | Sven Eden <yamakuzure@gmx.net> | 2017-12-12 07:54:16 +0100 |
commit | 20710c92ba65584a6fba036f9a2c3624a6bc2565 (patch) | |
tree | 1b8936dc3b5f9fd605a5dc8a820baa95dbcc4203 /man | |
parent | 5fc9b845038323a4281383b00221852cfdd37a8d (diff) |
Prep 229.9: Make all supportable API functions visible.
The process of cleaning up elogind, meaning to mask all bits that are
unneeded by elogind, has been finished a while ago.
It is therefore time to re-enable all previously masked API functions
that elogind can support. This will make it easier for future
developers to integrate elogind into their software where they
already support systemd-login.
Diffstat (limited to 'man')
-rw-r--r-- | man/glib-event-glue.c | 68 | ||||
-rw-r--r-- | man/sd_bus_message_append_string_memfd.xml | 153 | ||||
-rw-r--r-- | man/sd_bus_message_get_cookie.xml | 146 | ||||
-rw-r--r-- | man/sd_bus_message_get_monotonic_usec.xml | 181 | ||||
-rw-r--r-- | man/sd_bus_path_encode.xml | 188 | ||||
-rw-r--r-- | man/sd_event_get_fd.xml | 140 |
6 files changed, 876 insertions, 0 deletions
diff --git a/man/glib-event-glue.c b/man/glib-event-glue.c new file mode 100644 index 000000000..8f3168d0e --- /dev/null +++ b/man/glib-event-glue.c @@ -0,0 +1,68 @@ +/*** + Copyright 2014 Tom Gundersen + + Permission is hereby granted, free of charge, to any person + obtaining a copy of this software and associated documentation files + (the "Software"), to deal in the Software without restriction, + including without limitation the rights to use, copy, modify, merge, + publish, distribute, sublicense, and/or sell copies of the Software, + and to permit persons to whom the Software is furnished to do so, + subject to the following conditions: + + The above copyright notice and this permission notice shall be + included in all copies or substantial portions of the Software. + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + SOFTWARE. +***/ + +#include <stdlib.h> + +typedef struct SDEventSource { + GSource source; + GPollFD pollfd; + sd_event *event; +} SDEventSource; + +static gboolean event_prepare(GSource *source, gint *timeout_) { + return sd_event_prepare(((SDEventSource *)source)->event) > 0; +} + +static gboolean event_check(GSource *source) { + return sd_event_wait(((SDEventSource *)source)->event, 0) > 0; +} + +static gboolean event_dispatch(GSource *source, GSourceFunc callback, gpointer user_data) { + return sd_event_dispatch(((SDEventSource *)source)->event) > 0; +} + +static void event_finalize(GSource *source) { + sd_event_unref(((SDEventSource *)source)->event); +} + +static GSourceFuncs event_funcs = { + .prepare = event_prepare, + .check = event_check, + .dispatch = event_dispatch, + .finalize = event_finalize, +}; + +GSource *g_sd_event_create_source(sd_event *event) { + SDEventSource *source; + + source = (SDEventSource *)g_source_new(&event_funcs, sizeof(SDEventSource)); + + source->event = sd_event_ref(event); + source->pollfd.fd = sd_event_get_fd(event); + source->pollfd.events = G_IO_IN | G_IO_HUP | G_IO_ERR; + + g_source_add_poll((GSource *)source, &source->pollfd); + + return (GSource *)source; +} diff --git a/man/sd_bus_message_append_string_memfd.xml b/man/sd_bus_message_append_string_memfd.xml new file mode 100644 index 000000000..08f1fd001 --- /dev/null +++ b/man/sd_bus_message_append_string_memfd.xml @@ -0,0 +1,153 @@ +<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" +"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + This file is part of elogind. + + Copyright 2014 Zbigniew Jędrzejewski-Szmek + + elogind is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + elogind is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with elogind; If not, see <http://www.gnu.org/licenses/>. +--> + +<refentry id="sd_bus_message_append_string_memfd" + xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>sd_bus_message_append_string_memfd</title> + <productname>elogind</productname> + + <authorgroup> + <author> + <contrib>A monkey with a typewriter</contrib> + <firstname>Zbigniew</firstname> + <surname>Jędrzejewski-Szmek</surname> + <email>zbyszek@in.waw.pl</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>sd_bus_message_append_string_memfd</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_bus_message_append_string_memfd</refname> + <refname>sd_bus_message_append_string_iovec</refname> + <refname>sd_bus_message_append_string_space</refname> + + <refpurpose>Attach a string to a message</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <elogind/sd-bus.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>int sd_bus_message_append_string_memfd</funcdef> + <paramdef>sd_bus_message *<parameter>m</parameter></paramdef> + <paramdef>int <parameter>memfd</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int sd_bus_message_append_string_iovec</funcdef> + <paramdef>sd_bus_message *<parameter>m</parameter></paramdef> + <paramdef>const struct iovec *<parameter>iov</parameter></paramdef> + <paramdef>unsigned <parameter>n</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int sd_bus_message_append_string_space</funcdef> + <paramdef>sd_bus_message *<parameter>m</parameter></paramdef> + <paramdef>size_t <parameter>size</parameter></paramdef> + <paramdef>char **<parameter>s</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para>The functions + <function>sd_bus_message_append_string_memfd</function> and + <function>sd_bus_message_append_string_iovec</function> can be + used to append a single string (item of type <literal>s</literal>) + to message <parameter>m</parameter>.</para> + + <para>In case of + <function>sd_bus_message_append_string_memfd</function>, the + contents of <parameter>memfd</parameter> are the string. They must + satisfy the same constraints as described for the + <literal>s</literal> type in + <citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para> + + <para>In case of + <function>sd_bus_message_append_string_iovec</function>, the + payload of <parameter>iov</parameter> is the string. It must + satisfy the same constraints as described for the + <literal>s</literal> type in + <citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para> + + <para>The <parameter>iov</parameter> argument must point to + <parameter>n</parameter> <structname>struct iovec</structname> + structures. Each structure may have the + <structname>iov_base</structname> field set, in which case the + memory pointed to will be copied into the message, or unset, in + which case a block of spaces (ASCII 32) of length + <structname>iov_len</structname> will be inserted. The + memory pointed at by <parameter>iov</parameter> may be changed + after this call.</para> + + <para>The + <function>sd_bus_message_append_string_space</function> function appends + space for a string to message <parameter>m</parameter>. It behaves + similar to <function>sd_bus_message_append_basic</function> with + type <literal>s</literal>, but instead of copying a string into + the message, it returns a pointer to the destination area to + the caller in pointer <parameter>p</parameter>. Space for the string + of length <parameter>size</parameter> plus the terminating + <constant>NUL</constant> is allocated.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, those calls return 0 or a positive integer. On + failure, they returns a negative errno-style error code.</para> + </refsect1> + + <xi:include href="sd_bus_message_append_basic.xml" xpointer="errors" /> + + <refsect1> + <title>Notes</title> + + <para>The functions described here are available as a shared library, + which can be compiled and linked to with the + <constant>libelogind</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> + file.</para> + </refsect1> + + <refsect1> + <title>See Also</title> + + <para> + <citerefentry><refentrytitle>elogind</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <ulink url="http://dbus.freedesktop.org/doc/dbus-specification.html">The D-Bus specification</ulink> + </para> + </refsect1> + +</refentry> diff --git a/man/sd_bus_message_get_cookie.xml b/man/sd_bus_message_get_cookie.xml new file mode 100644 index 000000000..7994d72aa --- /dev/null +++ b/man/sd_bus_message_get_cookie.xml @@ -0,0 +1,146 @@ +<?xml version='1.0'?> <!--*-nxml-*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + This file is part of elogind. + + Copyright 2013 Lennart Poettering + + elogind is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + elogind is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with elogind; If not, see <http://www.gnu.org/licenses/>. +--> + +<refentry id="sd_bus_message_get_cookie"> + + <refentryinfo> + <title>sd_bus_message_get_cookie</title> + <productname>elogind</productname> + + <authorgroup> + <author> + <contrib>Developer</contrib> + <firstname>Lennart</firstname> + <surname>Poettering</surname> + <email>lennart@poettering.net</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>sd_bus_message_get_cookie</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_bus_message_get_cookie</refname> + <refname>sd_bus_message_get_reply_cookie</refname> + <refpurpose>Returns the transaction cookie of a message</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <elogind/sd-bus.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>int <function>sd_bus_message_get_cookie</function></funcdef> + <paramdef>sd_bus_message *<parameter>message</parameter></paramdef> + <paramdef>uint64_t *<parameter>cookie</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_bus_message_get_reply_cookie</function></funcdef> + <paramdef>sd_bus_message *<parameter>message</parameter></paramdef> + <paramdef>uint64_t *<parameter>cookie</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><function>sd_bus_message_get_cookie()</function> returns the + transaction cookie of a message. The cookie uniquely identifies a + message within each bus peer, but is not globally unique. It is + assigned when a message is sent.</para> + + <para><function>sd_bus_message_get_reply_cookie()</function> + returns the transaction cookie of the message the specified + message is a response to. When a reply message is generated for a + method call message, its cookie is copied over into this field. + Note that while every message that is transferred is identified by + a cookie, only response messages carry a reply cookie + field.</para> + + <para>Both functions take a message object as first parameter and + a place to store the 64-bit cookie in.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, these calls return 0 or a positive integer. On + failure, these calls return a negative errno-style error + code.</para> + + <para>On success, the cookie/reply cookie is returned in the + specified 64-bit unsigned integer variable.</para> + </refsect1> + + <refsect1> + <title>Errors</title> + + <para>Returned errors may indicate the following problems:</para> + + <variablelist> + <varlistentry> + <term><constant>-EINVAL</constant></term> + + <listitem><para>A specified parameter + is invalid.</para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ENODATA</constant></term> + + <listitem><para>No cookie has been assigned to this message. + This either indicates that the message has not been sent yet + and hence has no cookie assigned, or that the message is not a + method response message and hence carries a reply cookie + field.</para></listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Notes</title> + + <para>The <function>sd_bus_message_get_cookie()</function> and + <function>sd_bus_message_get_reply_cookie()</function> interfaces + are available as a shared library, which can be compiled and + linked to with the + <constant>libelogind</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> + file.</para> + </refsect1> + + <refsect1> + <title>See Also</title> + + <para> + <citerefentry><refentrytitle>elogind</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_bus_new</refentrytitle><manvolnum>3</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> diff --git a/man/sd_bus_message_get_monotonic_usec.xml b/man/sd_bus_message_get_monotonic_usec.xml new file mode 100644 index 000000000..4fb50252a --- /dev/null +++ b/man/sd_bus_message_get_monotonic_usec.xml @@ -0,0 +1,181 @@ +<?xml version='1.0'?> <!--*-nxml-*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + This file is part of elogind. + + Copyright 2013 Lennart Poettering + + elogind is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + elogind is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with elogind; If not, see <http://www.gnu.org/licenses/>. +--> + +<refentry id="sd_bus_message_get_monotonic_usec"> + + <refentryinfo> + <title>sd_bus_message_get_monotonic_usec</title> + <productname>elogind</productname> + + <authorgroup> + <author> + <contrib>Developer</contrib> + <firstname>Lennart</firstname> + <surname>Poettering</surname> + <email>lennart@poettering.net</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>sd_bus_message_get_monotonic_usec</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_bus_message_get_monotonic_usec</refname> + <refname>sd_bus_message_get_realtime_usec</refname> + <refname>sd_bus_message_get_seqnum</refname> + <refpurpose>Retrieve the sender timestamps and sequence number of a message</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <elogind/sd-bus.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>int <function>sd_bus_message_get_monotonic_usec</function></funcdef> + <paramdef>sd_bus_message *<parameter>message</parameter></paramdef> + <paramdef>uint64_t *<parameter>usec</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_bus_message_get_realtime_usec</function></funcdef> + <paramdef>sd_bus_message *<parameter>message</parameter></paramdef> + <paramdef>uint64_t *<parameter>usec</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_bus_message_get_seqnum</function></funcdef> + <paramdef>sd_bus_message *<parameter>message</parameter></paramdef> + <paramdef>uint64_t *<parameter>seqnum</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><function>sd_bus_message_get_monotonic_usec()</function> + returns the monotonic timestamp of the time the message was sent. + This value is in microseconds since the + <constant>CLOCK_MONOTONIC</constant> epoch, see + <citerefentry><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry> + for details.</para> + + <para>Similarly, + <function>sd_bus_message_get_realtime_usec()</function> returns + the realtime (wallclock) timestamp of the time the message was + sent. This value is in microseconds since Jan 1st, 1970, i.e. in + the <constant>CLOCK_REALTIME</constant> clock.</para> + + <para><function>sd_bus_message_get_seqnum()</function> returns the + kernel-assigned sequence number of the message. The kernel assigns + a global, monotonically increasing sequence number to all messages + transmitted on the local system, at the time the message was sent. + This sequence number is useful for determining message send order, + even across different buses of the local system. The sequence + number combined with the boot ID of the system (as returned by + <citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry>) + is a suitable globally unique identifier for bus messages.</para> + + <para>Note that the sending order and receiving order of messages + might differ, in particular for broadcast messages. This means + that the sequence number and the timestamps of messages a client + reads are not necessarily monotonically increasing.</para> + + <para>These timestamps and the sequence number are attached to + each message by the kernel and cannot be manipulated by the + sender.</para> + + <para>Note that these timestamps are only available on some bus + transports, and only after support for them has been negotiated + with the + <citerefentry><refentrytitle>sd_bus_negotiate_timestamp</refentrytitle><manvolnum>3</manvolnum></citerefentry> + call.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, these calls return 0 or a positive integer. On + failure, these calls return a negative errno-style error + code.</para> + + <para>On success, the timestamp or sequence number is returned in + the specified 64-bit unsigned integer variable.</para> + </refsect1> + + <refsect1> + <title>Errors</title> + + <para>Returned errors may indicate the following problems:</para> + + <variablelist> + <varlistentry> + <term><constant>-EINVAL</constant></term> + + <listitem><para>A specified parameter is + invalid.</para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ENODATA</constant></term> + + <listitem><para>No timestamp or sequence number information is + attached to the passed message. This error is returned if the + underlying transport does not support timestamping or + assigning of sequence numbers, or if this feature has not been + negotiated with + <citerefentry><refentrytitle>sd_bus_negotiate_timestamp</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Notes</title> + + <para>The + <function>sd_bus_message_get_monotonic_usec()</function>, + <function>sd_bus_message_get_realtime_usec()</function>, and + <function>sd_bus_message_get_seqnum()</function> interfaces are + available as a shared library, which can be compiled and linked to + with the + <constant>libelogind</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> + file.</para> + </refsect1> + + <refsect1> + <title>See Also</title> + + <para> + <citerefentry><refentrytitle>elogind</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_bus_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_bus_negotiate_timestamp</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> diff --git a/man/sd_bus_path_encode.xml b/man/sd_bus_path_encode.xml new file mode 100644 index 000000000..3fbb37cea --- /dev/null +++ b/man/sd_bus_path_encode.xml @@ -0,0 +1,188 @@ +<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" +"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + This file is part of elogind. + + Copyright 2014 Zbigniew Jędrzejewski-Szmek + + elogind is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + elogind is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with elogind; If not, see <http://www.gnu.org/licenses/>. +--> + +<refentry id="sd_bus_path_encode"> + + <refentryinfo> + <title>sd_bus_path_encode</title> + <productname>elogind</productname> + + <authorgroup> + <author> + <contrib>A monkey with a typewriter</contrib> + <firstname>Zbigniew</firstname> + <surname>Jędrzejewski-Szmek</surname> + <email>zbyszek@in.waw.pl</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>sd_bus_path_encode</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_bus_path_encode</refname> + <refname>sd_bus_path_encode_many</refname> + <refname>sd_bus_path_decode</refname> + <refname>sd_bus_path_decode_many</refname> + + <refpurpose>Convert an external identifier into an object path and back</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <elogind/sd-bus.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>int <function>sd_bus_path_encode</function></funcdef> + <paramdef>const char *<parameter>prefix</parameter></paramdef> + <paramdef>const char *<parameter>external_id</parameter></paramdef> + <paramdef>char **<parameter>ret_path</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_bus_path_encode_many</function></funcdef> + <paramdef>char **<parameter>out</parameter></paramdef> + <paramdef>const char *<parameter>path_template</parameter></paramdef> + <paramdef>...</paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_bus_path_decode</function></funcdef> + <paramdef>const char *<parameter>path</parameter></paramdef> + <paramdef>const char *<parameter>prefix</parameter></paramdef> + <paramdef>char **<parameter>ret_external_id</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_bus_path_decode_many</function></funcdef> + <paramdef>const char *<parameter>path</parameter></paramdef> + <paramdef>const char *<parameter>path_template</parameter></paramdef> + <paramdef>...</paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><function>sd_bus_path_encode()</function> and + <function>sd_bus_path_decode()</function> convert external + identifier strings into object paths and back. These functions are + useful to map application-specific string identifiers of any kind + into bus object paths in a simple, reversible and safe way.</para> + + <para><function>sd_bus_path_encode()</function> takes a bus path + prefix and an external identifier string as arguments, plus a + place to store the returned bus path string. The bus path prefix + must be a valid bus path, starting with a slash + <literal>/</literal>, and not ending in one. The external + identifier string may be in any format, may be the empty string, + and has no restrictions on the charset — however, it must + always be <constant>NUL</constant>-terminated. The returned string + will be the concatenation of the bus path prefix plus an escaped + version of the external identifier string. This operation may be + reversed with <function>sd_bus_decode()</function>. It is + recommended to only use external identifiers that generally + require little escaping to be turned into valid bus path + identifiers (for example, by sticking to a 7-bit ASCII character + set), in order to ensure the resulting bus path is still short and + easily processed.</para> + + <para><function>sd_bus_path_decode()</function> reverses the + operation of <function>sd_bus_path_encode()</function> and thus + regenerates an external identifier string from a bus path. It + takes a bus path and a prefix string, plus a place to store the + returned external identifier string. If the bus path does not + start with the specified prefix, 0 is returned and the returned + string is set to <constant>NULL</constant>. Otherwise, the + string following the prefix is unescaped and returned in the + external identifier string.</para> + + <para>The escaping used will replace all characters which are + invalid in a bus object path by <literal>_</literal>, followed by a + hexadecimal value. As a special case, the empty string will be + replaced by a lone <literal>_</literal>.</para> + + <para><function>sd_bus_path_encode_many()</function> works like + its counterpart <function>sd_bus_path_encode()</function>, but + takes a path template as argument and encodes multiple labels + according to its embedded directives. For each + <literal>%</literal> character found in the template, the caller + must provide a string via varargs, which will be encoded and + embedded at the position of the <literal>%</literal> character. + Any other character in the template is copied verbatim into the + encoded path.</para> + + <para><function>sd_bus_path_decode_many()</function> does the + reverse of <function>sd_bus_path_encode_many()</function>. It + decodes the passed object path according to the given + path template. For each <literal>%</literal> character in the + template, the caller must provide an output storage + (<literal>char **</literal>) via varargs. The decoded label + will be stored there. Each <literal>%</literal> character will + only match the current label. It will never match across labels. + Furthermore, only a single directive is allowed per label. + If <literal>NULL</literal> is passed as output storage, the + label is verified but not returned to the caller.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, <function>sd_bus_path_encode()</function> + returns positive or 0, and a valid bus path in the return + argument. On success, <function>sd_bus_path_decode()</function> + returns a positive value if the prefixed matched, or 0 if it + did not. If the prefix matched, the external identifier is returned + in the return parameter. If it did not match, NULL is returned in + the return parameter. On failure, a negative errno-style error + number is returned by either function. The returned strings must + be + <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>'d + by the caller.</para> + </refsect1> + + <refsect1> + <title>Notes</title> + + <para><function>sd_bus_path_encode()</function> and + <function>sd_bus_path_decode()</function> are available as a + shared library, which can be compiled and linked to with the + <constant>libelogind</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> + file.</para> + </refsect1> + + <refsect1> + <title>See Also</title> + + <para> + <citerefentry><refentrytitle>elogind</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> diff --git a/man/sd_event_get_fd.xml b/man/sd_event_get_fd.xml new file mode 100644 index 000000000..88671a2b9 --- /dev/null +++ b/man/sd_event_get_fd.xml @@ -0,0 +1,140 @@ +<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" +"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + This file is part of elogind. + + Copyright 2014 Zbigniew Jędrzejewski-Szmek + + elogind is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + elogind is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with elogind; If not, see <http://www.gnu.org/licenses/>. +--> + +<refentry id="sd_event_get_fd" xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>sd_event_get_fd</title> + <productname>elogind</productname> + + <authorgroup> + <author> + <contrib>More text</contrib> + <firstname>Zbigniew</firstname> + <surname>Jędrzejewski-Szmek</surname> + <email>zbyszek@in.waw.pl</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>sd_event_get_fd</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_event_get_fd</refname> + + <refpurpose>Obtain a file descriptor to poll for event loop events</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <elogind/sd-event.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>int <function>sd_event_get_fd</function></funcdef> + <paramdef>sd_event *<parameter>event</parameter></paramdef> + </funcprototype> + + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><function>sd_event_get_fd()</function> returns the file + descriptor that an event loop object returned by the + <citerefentry><refentrytitle>sd_event_new</refentrytitle><manvolnum>3</manvolnum></citerefentry> + function uses to wait for events. This file descriptor may itself + be polled for + <constant>POLLIN</constant>/<constant>EPOLLIN</constant> + events. This makes it possible to embed an + <citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry> + event loop into another, possibly foreign, event loop.</para> + + <para>The returned file descriptor refers to an <citerefentry + project='man-pages'><refentrytitle>epoll</refentrytitle><manvolnum>7</manvolnum></citerefentry> + object. It is recommended not to alter it by invoking + <citerefentry + project='man-pages'><refentrytitle>epoll_ctl</refentrytitle><manvolnum>2</manvolnum></citerefentry> + on it, in order to avoid interference with the event loop's inner + logic and assumptions.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, <function>sd_event_get_fd()</function> returns a + non-negative file descriptor. On failure, it returns a negative + errno-style error code.</para> + </refsect1> + + <refsect1> + <title>Errors</title> + + <para>Returned errors may indicate the following problems:</para> + + <variablelist> + <varlistentry> + <term><constant>-EINVAL</constant></term> + + <listitem><para><parameter>event</parameter> is not a valid + pointer to an <structname>sd_event</structname> structure. + </para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ECHILD</constant></term> + + <listitem><para>The event loop has been created in a different process.</para></listitem> + + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Examples</title> + + <example> + <title>Integration in the GLib event loop</title> + + <programlisting><xi:include href="glib-event-glue.c" parse="text" /></programlisting> + </example> + </refsect1> + + <xi:include href="libelogind-pkgconfig.xml" /> + + <refsect1> + <title>See Also</title> + + <para> + <citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_event_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_event_wait</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry project='man-pages'><refentrytitle>epoll_ctl</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry project='man-pages'><refentrytitle>epoll</refentrytitle><manvolnum>7</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |