Init

19 files changed, 2331 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
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--- /dev/null
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+build/
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,196 @@
+# Contributing to wlclock
+This file explains how you can contribute to wlclock.
+
+For larger contributions, especially for radical changes, I highly recommend you
+to ask me whether I will include your commit *before* you start investing time
+into it. Also please respect the coding style, even if you do not like it.
+
+
+## Communication
+You can ask questions and start discussions on the [mailing list](mailto:~leon_plickat/public-inbox@lists.sr.ht)
+or if you find me on IRC (my nick is "leon-p" and you can often find me on
+`#sway@freenode.net`).
+
+
+## Sending Patches
+You can send your patches via email to the mailing list. See
+[this](https://git-send-email.io/) helpful link to learn how to correctly send
+emails with git. Alternatively you can also manually attach a git patch file to
+a mail, but beware that this is more work for both you and me.
+
+All code review will happen on the mailing list as well.
+
+Write good commit messages!
+
+If you found this project on [GitHub](https://github.com/Leon-Plickat/wlclock),
+you can use that platforms contribution workflow and bug tracking system, but
+beware that I may be slow to respond to anything but email and that development
+officially takes place over at [sourcehut](https://sr.ht/~leon_plickat/wlclock/),
+the main hosting platform for this project.
+
+
+## Licensing and Copyright
+wlclock is licensed under the GPLv3, which applies to any contributions as
+well. I will not accept contributions under a different license, even if you
+create new files. The one single exception to this are Wayland protocol
+extensions.
+
+You are strongly invited to add your name to the copyright header of the files
+you changed and if you made an important contribution also to the authors
+sections in the man page and README. A Free Software project is proud of every
+contributor.
+
+
+## Style
+This section describes the coding style of wlclock. Try to follow it closely.
+
+Yes, it is not K&R. Cry me a river.
+
+Indent with tabs exclusively (looking at you, Emacs users).
+
+Lines should not exceed 80 characters. It is perfectly fine if a few lines are a
+few characters longer, but generally you should break up long lines.
+
+Braces go on the next line with struct declarations being the only exception.
+If only a single operation follows a conditional or loop, braces should not be
+used.
+
+    static void function (void)
+    {
+        struct Some_struct some_struct = {
+            .element_1 = 1,
+            .element_2 = 2
+        };
+
+        if ( val == 1 )
+        {
+            function_2();
+            function_3();
+        }
+        else
+            function_4();
+    }
+
+For switches, indent the case labels once and the following code twice.
+
+    switch (variable)
+    {
+        case 1:
+            /* do stuff... */
+            break;
+    }
+
+Conditionals are only separated by a space from their surrounding parenthesis
+if they contain more than just a single variable.
+
+    if (condition)
+    {
+        /* do stuff... */
+    }
+    else if ( variable == value )
+    {
+        /* do stuff... */
+    }
+
+An exception to this are `for` loops, where a space is only but always inserted
+after each semicolon.
+
+    for (int a = 0; a < 10; a--)
+    {
+        /* do stuff... */
+    }
+
+Logical operators in in-line conditionals or variable declarations / changes do
+not necessarily require parenthesis.
+
+    bool variable        = a == b;
+    int another_variable = a > b ? 4 : 5;
+
+Use `/* comment */` for permanent comments and `// comment` for temporary
+comments.
+
+Sometimes it makes sense to align variable declarations. But only sometimes.
+
+    type       name_3      = value;
+    type_1     name_acs    = value;
+    type_scsdc name_23     = value;
+    type_abc   name_advdfv = value;
+
+You can combine multiple declarations and calculations with commas. Just be
+careful that the code is still readable.
+
+    int a, b;
+    a = 1 + 2, b = a * 3;
+
+Name your bloody variables! With very, very few exceptions, a variable name
+should at least be three characters long. When someone sees your variable, they
+should pretty much immediately know what information is stored in it without
+needing to read the entire function. Variable names should generally be lower
+case, but exceptions are perfectly fine if justified.
+
+    DoNotUseCamelCase. Underscores_are_more_readable.
+
+If the data stored in your variable is complex / does complex things /
+influences complex things, document that.
+
+Variables usually should have a lower case name, although exceptions are fine if
+justified. The very first letter of a struct type or enum type name must be
+capitalised. Members of an enum must be fully caps.
+
+    enum My_fancy_enum
+    {
+        FANCY_1,
+        FANCY_2,
+        FANCY_3
+    }
+
+    struct Fancy_struct
+    {
+        int variable;
+    }
+
+    int another_variable;
+    struct Fancy_struct fs;
+
+`switch`, `while` and `for` may be in-lined after an `if` or `else` to
+reduce indentation complexity, but only if readability is not compromised and
+80 characters are not excessively exceeded. Under the same conditions, `case`
+blocks may be in-lined, if they only contains a single operation.
+
+    if (condition) switch (mode)
+    {
+        case MODE_1: do_stuff_1(); break;
+        case MODE_2: do_stuff_2(); break;
+        case MODE_3: do_stuff_3(); returned;
+    }
+    else while (stuff)
+    {
+        /* Do things... */
+    }
+
+`if` may be in-lined after `while`, `for` and `else` to reduce indentation
+complexity, but only if readability is not compromised and 80 characters are not
+excessively exceeded.
+
+    while (variable) if (condition)
+    {
+        /* Do stuff... */
+    }
+
+    for (int a = b; a > c; a += b) if (condition)
+    {
+        /* Do stuff... */
+    }
+
+    if (condition)
+    {
+        /* Do stuff... */
+    }
+    else if (condition)
+    {
+        /* Do stuff... */
+    }
+
+Never in-line variable declaration or changes, function calls or `return`,
+`goto`, `break` and friends.
+
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+ Everyone is permitted to copy and distribute verbatim copies
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+
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+  11. Patents.
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+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
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+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
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+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
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+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
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+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
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+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
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+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
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+to choose that version for the Program.
+
+  Later license versions may give you additional or different
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+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
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+  16. Limitation of Liability.
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+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..84a3bcd
--- /dev/null
+++ b/README.md
@@ -0,0 +1,42 @@
+# wlclock
+
+wlclock is a digital analog clock for Wayland desktops.
+
+
+## Building
+
+wlclock depends on Wayland, Wayland protocols and Cairo.
+
+To build this program you will need a C compiler, the meson & ninja build system
+and `scdoc` to generate the manpage.
+
+    git clone https://git.sr.ht/~leon_plickat/wlclock
+    cd wlclock
+    meson build
+    ninja -C build
+    sudo ninja -C build install
+
+
+## Contributing
+**Contributions are welcome!** Read `CONTRIBUTING.md` to find out how you can
+contribute. Do not be afraid, it is really not that complicated.
+
+If you found this project on [GitHub](https://github.com/Leon-Plickat/wlclock),
+you can use that platforms contribution workflow and bug tracking system, but
+beware that I may be slow to respond to anything but email and that development
+officially takes place over at [sourcehut](https://sr.ht/~leon_plickat/wlclock/),
+the main hosting platform for this project.
+
+
+## Licensing
+
+wlclock is licensed under the GPLv3.
+
+The contents of the `protocol` directory are licensed differently. Please see
+the header of the files for more information.
+
+
+## Authors
+
+Leon Plickat <leonhenrik.plickat@stud.uni-goettingen.de>
+
diff --git a/doc/wlclock.1.scd b/doc/wlclock.1.scd
new file mode 100644
index 0000000..4c0a6f6
--- /dev/null
+++ b/doc/wlclock.1.scd
@@ -0,0 +1,11 @@
+wlclock(1) ["Version 0.1.0" ["Version 0.1.0"]]
+
+# NAME
+wlclock - A digital analog clock for Wayland
+
+
+# DESCRIPTION
+
+
+# AUTHORS
+Leon Henrik Plickat <leonhenrik.plickat@stud.uni-goettingen.de>
diff --git a/meson.build b/meson.build
new file mode 100644
index 0000000..31a32e1
--- /dev/null
+++ b/meson.build
@@ -0,0 +1,95 @@
+project(
+  'wlclock',
+  'c',
+  version: '0.1.0',
+  license: 'GPLv3',
+  default_options: [
+    'c_std=c11',
+    'warning_level=3',
+    'werror=true',
+  ]
+)
+
+cc = meson.get_compiler('c')
+
+add_project_arguments(cc.get_supported_arguments([
+  '-D_POSIX_C_SOURCE=200809L',
+  '-DVERSION="0.1.0"',
+  '-fsigned-char',
+  '-Wno-unused-parameter',
+  '-Wpointer-arith',
+  '-Wformat-security',
+  '-Wunreachable-code',
+  '-Wformat',
+]), language: 'c')
+
+if get_option('handle-signals').enabled()
+  add_project_arguments(cc.get_supported_arguments([ '-DHANDLE_SIGNALS' ]), language: 'c')
+endif
+
+wayland_protocols = dependency('wayland-protocols')
+wayland_client    = dependency('wayland-client', include_type: 'system')
+wayland_cursor    = dependency('wayland-cursor', include_type: 'system')
+cairo             = dependency('cairo')
+realtime          = cc.find_library('rt')
+
+if ['dragonfly', 'freebsd', 'netbsd', 'openbsd'].contains(host_machine.system())
+  libepoll        = dependency('epoll-shim', required: get_option('handle-signals'))
+else
+  libepoll        = []
+endif
+
+subdir('protocol')
+
+executable(
+  'wlclock',
+  files(
+    'src/buffer.c',
+    'src/misc.c',
+    'src/output.c',
+    'src/surface.c',
+    'src/wlclock.c',
+  ),
+  dependencies: [
+    wayland_client,
+    wayland_protocols,
+    wayland_cursor,
+    cairo,
+    wl_protocols,
+    realtime,
+    libepoll,
+  ],
+  include_directories: include_directories('src'),
+  install: true,
+)
+
+scdoc = dependency(
+  'scdoc',
+  version: '>=1.9.2',
+  native: true,
+  required: get_option('man-pages'),
+)
+if scdoc.found()
+  scdoc_prog = find_program(scdoc.get_pkgconfig_variable('scdoc'), native: true)
+  sh = find_program('sh', native: true)
+  mandir = get_option('mandir')
+  man_files = [
+    'doc/wlclock.1.scd'
+  ]
+  foreach filename : man_files
+    topic = filename.split('.')[-3].split('/')[-1]
+    section = filename.split('.')[-2]
+    output = '@0@.@1@'.format(topic, section)
+
+    custom_target(
+      output,
+      input: filename,
+      output: output,
+      command: [
+        sh, '-c', '@0@ < @INPUT@ > @1@'.format(scdoc_prog.path(), output)
+      ],
+      install: true,
+      install_dir: '@0@/man@1@'.format(mandir, section)
+    )
+  endforeach
+endif
diff --git a/meson_options.txt b/meson_options.txt
new file mode 100644
index 0000000..020b255
--- /dev/null
+++ b/meson_options.txt
@@ -0,0 +1,2 @@
+option('man-pages', type: 'feature', value: 'auto', description: 'Generate and install man pages')
+option('handle-signals', type: 'feature', value: 'enabled', description: 'Handle signals')
diff --git a/protocol/meson.build b/protocol/meson.build
new file mode 100644
index 0000000..d5d972a
--- /dev/null
+++ b/protocol/meson.build
@@ -0,0 +1,42 @@
+wp_dir = wayland_protocols.get_pkgconfig_variable('pkgdatadir')
+
+wayland_scanner_dep = dependency('wayland-scanner', native: true)
+wayland_scanner = find_program(
+  wayland_scanner_dep.get_pkgconfig_variable('wayland_scanner'),
+  native: true,
+)
+
+protocols = [
+  [ wp_dir, 'stable/xdg-shell/xdg-shell.xml' ],
+  [ wp_dir, 'unstable/xdg-output/xdg-output-unstable-v1.xml' ],
+  [ 'wlr-layer-shell-unstable-v1.xml' ],
+]
+
+wl_protocols_src     = []
+wl_protocols_headers = []
+foreach p : protocols
+  xml = join_paths(p)
+  wl_protocols_src += custom_target(
+    xml.underscorify() + '_server_c',
+    input: xml,
+    output: '@BASENAME@-protocol.c',
+    command: [ wayland_scanner, 'private-code', '@INPUT@', '@OUTPUT@' ],
+  )
+  wl_protocols_headers += custom_target(
+    xml.underscorify() + '_client_h',
+    input: xml,
+    output: '@BASENAME@-protocol.h',
+    command: [ wayland_scanner, 'client-header', '@INPUT@', '@OUTPUT@' ],
+  )
+endforeach
+
+wl_protocols_lib = static_library(
+  'wlclock_protocols',
+  wl_protocols_src + wl_protocols_headers,
+  dependencies: [ wayland_client ],
+)
+
+wl_protocols = declare_dependency(
+  link_with: wl_protocols_lib,
+  sources: wl_protocols_headers,
+)
diff --git a/protocol/wlr-layer-shell-unstable-v1.xml b/protocol/wlr-layer-shell-unstable-v1.xml
new file mode 100644
index 0000000..6a5d5d3
--- /dev/null
+++ b/protocol/wlr-layer-shell-unstable-v1.xml
@@ -0,0 +1,285 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="wlr_layer_shell_unstable_v1">
+  <copyright>
+    Copyright © 2017 Drew DeVault
+
+    Permission to use, copy, modify, distribute, and sell this
+    software and its documentation for any purpose is hereby granted
+    without fee, provided that the above copyright notice appear in
+    all copies and that both that copyright notice and this permission
+    notice appear in supporting documentation, and that the name of
+    the copyright holders not be used in advertising or publicity
+    pertaining to distribution of the software without specific,
+    written prior permission.  The copyright holders make no
+    representations about the suitability of this software for any
+    purpose.  It is provided "as is" without express or implied
+    warranty.
+
+    THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+    SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+    FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+    SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+    AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+    ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+    THIS SOFTWARE.
+  </copyright>
+
+  <interface name="zwlr_layer_shell_v1" version="1">
+    <description summary="create surfaces that are layers of the desktop">
+      Clients can use this interface to assign the surface_layer role to
+      wl_surfaces. Such surfaces are assigned to a "layer" of the output and
+      rendered with a defined z-depth respective to each other. They may also be
+      anchored to the edges and corners of a screen and specify input handling
+      semantics. This interface should be suitable for the implementation of
+      many desktop shell components, and a broad number of other applications
+      that interact with the desktop.
+    </description>
+
+    <request name="get_layer_surface">
+      <description summary="create a layer_surface from a surface">
+        Create a layer surface for an existing surface. This assigns the role of
+        layer_surface, or raises a protocol error if another role is already
+        assigned.
+
+        Creating a layer surface from a wl_surface which has a buffer attached
+        or committed is a client error, and any attempts by a client to attach
+        or manipulate a buffer prior to the first layer_surface.configure call
+        must also be treated as errors.
+
+        You may pass NULL for output to allow the compositor to decide which
+        output to use. Generally this will be the one that the user most
+        recently interacted with.
+
+        Clients can specify a namespace that defines the purpose of the layer
+        surface.
+      </description>
+      <arg name="id" type="new_id" interface="zwlr_layer_surface_v1"/>
+      <arg name="surface" type="object" interface="wl_surface"/>
+      <arg name="output" type="object" interface="wl_output" allow-null="true"/>
+      <arg name="layer" type="uint" enum="layer" summary="layer to add this surface to"/>
+      <arg name="namespace" type="string" summary="namespace for the layer surface"/>
+    </request>
+
+    <enum name="error">
+      <entry name="role" value="0" summary="wl_surface has another role"/>
+      <entry name="invalid_layer" value="1" summary="layer value is invalid"/>
+      <entry name="already_constructed" value="2" summary="wl_surface has a buffer attached or committed"/>
+    </enum>
+
+    <enum name="layer">
+      <description summary="available layers for surfaces">
+        These values indicate which layers a surface can be rendered in. They
+        are ordered by z depth, bottom-most first. Traditional shell surfaces
+        will typically be rendered between the bottom and top layers.
+        Fullscreen shell surfaces are typically rendered at the top layer.
+        Multiple surfaces can share a single layer, and ordering within a
+        single layer is undefined.
+      </description>
+
+      <entry name="background" value="0"/>
+      <entry name="bottom" value="1"/>
+      <entry name="top" value="2"/>
+      <entry name="overlay" value="3"/>
+    </enum>
+  </interface>
+
+  <interface name="zwlr_layer_surface_v1" version="1">
+    <description summary="layer metadata interface">
+      An interface that may be implemented by a wl_surface, for surfaces that
+      are designed to be rendered as a layer of a stacked desktop-like
+      environment.
+
+      Layer surface state (size, anchor, exclusive zone, margin, interactivity)
+      is double-buffered, and will be applied at the time wl_surface.commit of
+      the corresponding wl_surface is called.
+    </description>
+
+    <request name="set_size">
+      <description summary="sets the size of the surface">
+        Sets the size of the surface in surface-local coordinates. The
+        compositor will display the surface centered with respect to its
+        anchors.
+
+        If you pass 0 for either value, the compositor will assign it and
+        inform you of the assignment in the configure event. You must set your
+        anchor to opposite edges in the dimensions you omit; not doing so is a
+        protocol error. Both values are 0 by default.
+
+        Size is double-buffered, see wl_surface.commit.
+      </description>
+      <arg name="width" type="uint"/>
+      <arg name="height" type="uint"/>
+    </request>
+
+    <request name="set_anchor">
+      <description summary="configures the anchor point of the surface">
+        Requests that the compositor anchor the surface to the specified edges
+        and corners. If two orthoginal edges are specified (e.g. 'top' and
+        'left'), then the anchor point will be the intersection of the edges
+        (e.g. the top left corner of the output); otherwise the anchor point
+        will be centered on that edge, or in the center if none is specified.
+
+        Anchor is double-buffered, see wl_surface.commit.
+      </description>
+      <arg name="anchor" type="uint" enum="anchor"/>
+    </request>
+
+    <request name="set_exclusive_zone">
+      <description summary="configures the exclusive geometry of this surface">
+        Requests that the compositor avoids occluding an area of the surface
+        with other surfaces. The compositor's use of this information is
+        implementation-dependent - do not assume that this region will not
+        actually be occluded.
+
+        A positive value is only meaningful if the surface is anchored to an
+        edge, rather than a corner. The zone is the number of surface-local
+        coordinates from the edge that are considered exclusive.
+
+        Surfaces that do not wish to have an exclusive zone may instead specify
+        how they should interact with surfaces that do. If set to zero, the
+        surface indicates that it would like to be moved to avoid occluding
+        surfaces with a positive excluzive zone. If set to -1, the surface
+        indicates that it would not like to be moved to accomodate for other
+        surfaces, and the compositor should extend it all the way to the edges
+        it is anchored to.
+
+        For example, a panel might set its exclusive zone to 10, so that
+        maximized shell surfaces are not shown on top of it. A notification
+        might set its exclusive zone to 0, so that it is moved to avoid
+        occluding the panel, but shell surfaces are shown underneath it. A
+        wallpaper or lock screen might set their exclusive zone to -1, so that
+        they stretch below or over the panel.
+
+        The default value is 0.
+
+        Exclusive zone is double-buffered, see wl_surface.commit.
+      </description>
+      <arg name="zone" type="int"/>
+    </request>
+
+    <request name="set_margin">
+      <description summary="sets a margin from the anchor point">
+        Requests that the surface be placed some distance away from the anchor
+        point on the output, in surface-local coordinates. Setting this value
+        for edges you are not anchored to has no effect.
+
+        The exclusive zone includes the margin.
+
+        Margin is double-buffered, see wl_surface.commit.
+      </description>
+      <arg name="top" type="int"/>
+      <arg name="right" type="int"/>
+      <arg name="bottom" type="int"/>
+      <arg name="left" type="int"/>
+    </request>
+
+    <request name="set_keyboard_interactivity">
+      <description summary="requests keyboard events">
+        Set to 1 to request that the seat send keyboard events to this layer
+        surface. For layers below the shell surface layer, the seat will use
+        normal focus semantics. For layers above the shell surface layers, the
+        seat will always give exclusive keyboard focus to the top-most layer
+        which has keyboard interactivity set to true.
+
+        Layer surfaces receive pointer, touch, and tablet events normally. If
+        you do not want to receive them, set the input region on your surface
+        to an empty region.
+
+        Events is double-buffered, see wl_surface.commit.
+      </description>
+      <arg name="keyboard_interactivity" type="uint"/>
+    </request>
+
+    <request name="get_popup">
+      <description summary="assign this layer_surface as an xdg_popup parent">
+        This assigns an xdg_popup's parent to this layer_surface.  This popup
+        should have been created via xdg_surface::get_popup with the parent set
+        to NULL, and this request must be invoked before committing the popup's
+        initial state.
+
+        See the documentation of xdg_popup for more details about what an
+        xdg_popup is and how it is used.
+      </description>
+      <arg name="popup" type="object" interface="xdg_popup"/>
+    </request>
+
+    <request name="ack_configure">
+      <description summary="ack a configure event">
+        When a configure event is received, if a client commits the
+        surface in response to the configure event, then the client
+        must make an ack_configure request sometime before the commit
+        request, passing along the serial of the configure event.
+
+        If the client receives multiple configure events before it
+        can respond to one, it only has to ack the last configure event.
+
+        A client is not required to commit immediately after sending
+        an ack_configure request - it may even ack_configure several times
+        before its next surface commit.
+
+        A client may send multiple ack_configure requests before committing, but
+        only the last request sent before a commit indicates which configure
+        event the client really is responding to.
+      </description>
+      <arg name="serial" type="uint" summary="the serial from the configure event"/>
+    </request>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy the layer_surface">
+        This request destroys the layer surface.
+      </description>
+    </request>
+
+    <event name="configure">
+      <description summary="suggest a surface change">
+        The configure event asks the client to resize its surface.
+
+        Clients should arrange their surface for the new states, and then send
+        an ack_configure request with the serial sent in this configure event at
+        some point before committing the new surface.
+
+        The client is free to dismiss all but the last configure event it
+        received.
+
+        The width and height arguments specify the size of the window in
+        surface-local coordinates.
+
+        The size is a hint, in the sense that the client is free to ignore it if
+        it doesn't resize, pick a smaller size (to satisfy aspect ratio or
+        resize in steps of NxM pixels). If the client picks a smaller size and
+        is anchored to two opposite anchors (e.g. 'top' and 'bottom'), the
+        surface will be centered on this axis.
+
+        If the width or height arguments are zero, it means the client should
+        decide its own window dimension.
+      </description>
+      <arg name="serial" type="uint"/>
+      <arg name="width" type="uint"/>
+      <arg name="height" type="uint"/>
+    </event>
+
+    <event name="closed">
+      <description summary="surface should be closed">
+        The closed event is sent by the compositor when the surface will no
+        longer be shown. The output may have been destroyed or the user may
+        have asked for it to be removed. Further changes to the surface will be
+        ignored. The client should destroy the resource after receiving this
+        event, and create a new surface if they so choose.
+      </description>
+    </event>
+
+    <enum name="error">
+      <entry name="invalid_surface_state" value="0" summary="provided surface state is invalid"/>
+      <entry name="invalid_size" value="1" summary="size is invalid"/>
+      <entry name="invalid_anchor" value="2" summary="anchor bitfield is invalid"/>
+    </enum>
+
+    <enum name="anchor" bitfield="true">
+      <entry name="top" value="1" summary="the top edge of the anchor rectangle"/>
+      <entry name="bottom" value="2" summary="the bottom edge of the anchor rectangle"/>
+      <entry name="left" value="4" summary="the left edge of the anchor rectangle"/>
+      <entry name="right" value="8" summary="the right edge of the anchor rectangle"/>
+    </enum>
+  </interface>
+</protocol>
diff --git a/src/buffer.c b/src/buffer.c
new file mode 100644
index 0000000..83f48ad
--- /dev/null
+++ b/src/buffer.c
@@ -0,0 +1,184 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <time.h>
+#include <sys/mman.h>
+#include <cairo/cairo.h>
+
+#include"buffer.h"
+#include"misc.h"
+
+static void randomize_string (char *str, size_t len)
+{
+	struct timespec ts;
+	clock_gettime(CLOCK_REALTIME, &ts);
+	long r = ts.tv_nsec;
+
+	for (size_t i = 0; i < len; i++, str++)
+	{
+		/* Use two byte from the current nano-second to pseudo-randomly
+		 * increase the ASCII character 'A' into another character,
+		 * which will then subsitute the character at *str.
+		 */
+		*str = (char)('A' + (r&15) + (r&16));
+		r >>= 5;
+	}
+}
+
+/* Tries to create a shared memory object and returns its file descriptor if
+ * successful.
+ */
+static bool get_shm_fd (int *fd, size_t size)
+{
+	char name[] = "/wlclock-RANDOM";
+	char *rp    = name + 9; /* Pointer to random part. */
+	size_t rl   = 6;        /* Length of random part. */
+
+	/* Try a few times to get a unique name. */
+	for (int tries = 100; tries > 0; tries--)
+	{
+		/* Make the name pseudo-random to not conflict with other
+		 * running instances of Wlclock.
+		 */
+		randomize_string(rp, rl);
+
+		/* Try to create a shared memory object. Returns -1 if the
+		 * memory object already exists.
+		 */
+		errno = 0;
+		*fd   = shm_open(name, O_RDWR | O_CREAT | O_EXCL, 0600);
+
+		/* If a shared memory object was created, set its size and
+		 * return its file descriptor.
+		 */
+		if ( *fd >= 0 )
+		{
+			shm_unlink(name);
+			if ( ftruncate(*fd, (off_t)size) < 0 )
+			{
+				close(*fd);
+				return false;
+			}
+			return true;
+		}
+
+		/* The EEXIST error means that the name is not unique and we
+		 * must try again.
+		 */
+		if ( errno != EEXIST )
+		{
+			clocklog(NULL, 0, "ERROR: shm_open: %s\n", strerror(errno));
+			return false;
+		}
+	}
+
+	return false;
+}
+
+static void buffer_handle_release (void *data, struct wl_buffer *wl_buffer)
+{
+	struct Wlclock_buffer *buffer = (struct Wlclock_buffer *)data;
+	buffer->busy                  = false;
+}
+
+static const struct wl_buffer_listener buffer_listener = {
+	.release = buffer_handle_release,
+};
+
+static bool create_buffer (struct wl_shm *shm, struct Wlclock_buffer *buffer,
+		uint32_t _w, uint32_t _h)
+{
+	int32_t w = (int32_t)_w, h = (int32_t)_h;
+
+	const enum wl_shm_format wl_fmt    = WL_SHM_FORMAT_ARGB8888;
+	const cairo_format_t     cairo_fmt = CAIRO_FORMAT_ARGB32;
+
+	int32_t stride = cairo_format_stride_for_width(cairo_fmt, w);
+	size_t   size  = (size_t)(stride * h);
+
+	buffer->w    = _w;
+	buffer->h    = _h;
+	buffer->size = size;
+
+	if ( size == 0 )
+	{
+		buffer->memory_object = NULL;
+		buffer->surface       = NULL;
+		buffer->cairo         = NULL;
+		return true;
+	}
+
+	int fd;
+	if (! get_shm_fd(&fd, size))
+		return false;
+
+	errno = 0;
+	if ( MAP_FAILED == (buffer->memory_object = mmap(NULL, size,
+					PROT_READ | PROT_WRITE, MAP_SHARED,
+					fd, 0)) )
+	{
+		close(fd);
+		clocklog(NULL, 0, "ERROR: mmap: %s\n", strerror(errno));
+		return false;
+	}
+
+	struct wl_shm_pool *pool = wl_shm_create_pool(shm, fd, (int32_t)size);
+	buffer->buffer = wl_shm_pool_create_buffer(pool, 0, w, h, stride,
+			wl_fmt);
+	wl_buffer_add_listener(buffer->buffer, &buffer_listener, buffer);
+	wl_shm_pool_destroy(pool);
+
+	close(fd);
+
+	buffer->surface = cairo_image_surface_create_for_data(
+		buffer->memory_object, cairo_fmt, w, h, stride);
+	buffer->cairo = cairo_create(buffer->surface);
+
+	return true;
+}
+
+void finish_buffer (struct Wlclock_buffer *buffer)
+{
+	if (buffer->buffer)
+		wl_buffer_destroy(buffer->buffer);
+	if (buffer->cairo)
+		cairo_destroy(buffer->cairo);
+	if (buffer->surface)
+		cairo_surface_destroy(buffer->surface);
+	if (buffer->memory_object)
+		munmap(buffer->memory_object, buffer->size);
+	memset(buffer, 0, sizeof(struct Wlclock_buffer));
+}
+
+bool next_buffer (struct Wlclock_buffer **buffer, struct wl_shm *shm,
+		struct Wlclock_buffer buffers[static 2], uint32_t w, uint32_t h)
+{
+	/* Check if buffers are busy and use first non-busy one, if it exists.
+	 * If all buffers are busy, exit.
+	 */
+	if (! buffers[0].busy)
+		*buffer = &buffers[0];
+	else if (! buffers[1].busy)
+		*buffer = &buffers[1];
+	else
+	{
+		clocklog(NULL, 0, "ERROR: All buffers are busy.\n");
+		*buffer = NULL;
+		return false;
+	}
+
+	/* If the buffers dimensions do not match, or if there is no wl_buffer
+	 * or if the buffer does not exist, close it and create a new one.
+	 */
+	if ( (*buffer)->w != w || (*buffer)->h != h || ! (*buffer)->buffer )
+	{
+		finish_buffer(*buffer);
+		if (! create_buffer(shm, *buffer, w, h))
+			return false;
+	}
+
+	return true;
+}
diff --git a/src/buffer.h b/src/buffer.h
new file mode 100644
index 0000000..3e82541
--- /dev/null
+++ b/src/buffer.h
@@ -0,0 +1,25 @@
+#ifndef WLCLOCK_BUFFER_H
+#define WLCLOCK_BUFFER_H
+
+#include<stdint.h>
+#include<stdbool.h>
+#include<cairo/cairo.h>
+#include<wayland-client.h>
+
+struct Wlclock_buffer
+{
+	struct wl_buffer *buffer;
+	cairo_surface_t  *surface;
+	cairo_t          *cairo;
+	uint32_t          w;
+	uint32_t          h;
+	void             *memory_object;
+	size_t            size;
+	bool              busy;
+};
+
+bool next_buffer (struct Wlclock_buffer **buffer, struct wl_shm *shm,
+		struct Wlclock_buffer buffers[static 2], uint32_t w, uint32_t h);
+void finish_buffer (struct Wlclock_buffer *buffer);
+
+#endif
diff --git a/src/misc.c b/src/misc.c
new file mode 100644
index 0000000..dd4500d
--- /dev/null
+++ b/src/misc.c
@@ -0,0 +1,30 @@
+#include<stdarg.h>
+#include<stdio.h>
+#include<stdlib.h>
+#include<string.h>
+#include<unistd.h>
+
+#include"wlclock.h"
+
+void free_if_set (void *ptr)
+{
+	if ( ptr != NULL )
+		free(ptr);
+}
+
+void set_string (char **ptr, char *arg)
+{
+	free_if_set(*ptr);
+	*ptr = strdup(arg);
+}
+
+void clocklog (struct Wlclock *clock, int level, const char *fmt, ...)
+{
+	if ( clock != NULL && level > clock->verbosity )
+		return;
+
+	va_list args;
+	va_start(args, fmt);
+	vfprintf(stderr, fmt, args);
+	va_end(args);
+}
diff --git a/src/misc.h b/src/misc.h
new file mode 100644
index 0000000..f262771
--- /dev/null
+++ b/src/misc.h
@@ -0,0 +1,10 @@
+#ifndef WLCLOCK_MISC_H
+#define WLCLOCK_MISC_H
+
+struct Wlclock;
+
+void free_if_set (void *ptr);
+void set_string (char **ptr, char *arg);
+void clocklog (struct Wlclock *clock, int level, const char *fmt, ...);
+
+#endif
diff --git a/src/output.c b/src/output.c
new file mode 100644
index 0000000..102d510
--- /dev/null
+++ b/src/output.c
@@ -0,0 +1,169 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<stdbool.h>
+#include<unistd.h>
+#include<string.h>
+#include<assert.h>
+
+#include<wayland-server.h>
+#include<wayland-client.h>
+#include<wayland-client-protocol.h>
+
+#include"xdg-output-unstable-v1-protocol.h"
+#include"xdg-shell-protocol.h"
+
+#include"wlclock.h"
+#include"misc.h"
+#include"output.h"
+#include"surface.h"
+
+/* No-Op function. */
+static void noop () {}
+
+static void output_handle_scale (void *data, struct wl_output *wl_output,
+		int32_t factor)
+{
+	struct Wlclock_output *output = (struct Wlclock_output *)data;
+	output->scale                 = (uint32_t)factor;
+	clocklog(output->clock, 1, "[output] Property update: global_name=%d scale=%d\n",
+				output->global_name, output->scale);
+}
+
+static void output_update_surface (struct Wlclock_output *output)
+{
+	if ( ! output->configured || output->name == NULL )
+		return;
+
+	struct Wlclock *clock = output->clock;
+	if ( clock->output == NULL || ! strcmp(clock->output, output->name) )
+		create_surface(output);
+}
+
+static void output_handle_done (void *data, struct wl_output *wl_output)
+{
+	/* This event is sent after all output property changes (by wl_output
+	 * and by xdg_output) have been advertised by preceding events.
+	 */
+	struct Wlclock_output *output = (struct Wlclock_output *)data;
+	clocklog(output->clock, 1, "[output] Atomic update complete: global_name=%d\n",
+				output->global_name);
+	if ( output->surface != NULL )
+		update_surface(output->surface);
+	else
+		output_update_surface(output);
+}
+
+static const struct wl_output_listener output_listener = {
+	.scale    = output_handle_scale,
+	.geometry = noop,
+	.mode     = noop,
+	.done     = output_handle_done
+};
+
+static void xdg_output_handle_name (void *data, struct zxdg_output_v1 *xdg_output,
+		const char *name)
+{
+	struct Wlclock_output *output = (struct Wlclock_output *)data;
+	set_string(&output->name, (char *)name);
+	clocklog(output->clock, 1, "[output] Property update: global_name=%d name=%s\n",
+				output->global_name, name);
+}
+
+static const struct zxdg_output_v1_listener xdg_output_listener = {
+	.name             = xdg_output_handle_name,
+	.logical_size     = noop,
+	.logical_position = noop,
+	.description      = noop,
+
+	/* Deprecated since version 3, xdg_output property changes now send wl_output.done */
+	.done             = noop
+};
+
+bool configure_output (struct Wlclock_output *output)
+{
+	struct Wlclock *clock = output->clock;
+	clocklog(clock, 1, "[output] Configuring: global_name=%d\n", output->global_name);
+
+	/* Create xdg_output and attach listeners. */
+	if ( NULL == (output->xdg_output = zxdg_output_manager_v1_get_xdg_output(
+					clock->xdg_output_manager, output->wl_output)) )
+	{
+		clocklog(NULL, 0, "ERROR: Could not get XDG output.\n");
+		return false;
+	}
+
+	zxdg_output_v1_add_listener(output->xdg_output, &xdg_output_listener, output);
+	output->configured = true;
+	return true;
+}
+
+bool create_output (struct Wlclock *clock, struct wl_registry *registry,
+		uint32_t name, const char *interface, uint32_t version)
+{
+	clocklog(clock, 1, "[output] Creating: global_name=%d\n", name);
+
+	struct wl_output *wl_output = wl_registry_bind(registry, name,
+			&wl_output_interface, 3);
+	assert(wl_output);
+
+	struct Wlclock_output *output = calloc(1, sizeof(struct Wlclock_output));
+	if ( output == NULL )
+	{
+		clocklog(NULL, 0, "ERROR: Could not allocate.\n");
+		return false;
+	}
+
+	output->clock       = clock;
+	output->global_name = name;
+	output->scale       = 1;
+	output->wl_output   = wl_output;
+	output->configured  = false;
+	output->name        = NULL;
+
+	wl_list_insert(&clock->outputs, &output->link);
+	wl_output_set_user_data(wl_output, output);
+	wl_output_add_listener(wl_output, &output_listener, output);
+
+	/* We can only use the output if we have both xdg_output_manager and
+	 * the layer_shell. If either one is not available yet, we have to
+	 * configure the output later (see init_wayland()).
+	 */
+	if ( clock->xdg_output_manager != NULL && clock->layer_shell != NULL )
+	{
+		if (! configure_output(output))
+			return false;
+	}
+	else
+		clocklog(clock, 2, "[output] Not yet configureable.\n");
+
+	return true;
+}
+
+struct Wlclock_output *get_output_from_global_name (struct Wlclock *clock, uint32_t name)
+{
+	struct Wlclock_output *op;
+	wl_list_for_each(op, &clock->outputs, link)
+		if ( op->global_name == name )
+			return op;
+	return NULL;
+}
+
+void destroy_output (struct Wlclock_output *output)
+{
+	if ( output == NULL )
+		return;
+	 if ( output->surface != NULL )
+		destroy_surface(output->surface);
+	wl_list_remove(&output->link);
+	wl_output_destroy(output->wl_output);
+	free(output);
+}
+
+void destroy_all_outputs (struct Wlclock *clock)
+{
+	clocklog(clock, 1, "[output] Destroying all outputs.\n");
+	struct Wlclock_output *op, *tmp;
+	wl_list_for_each_safe(op, tmp, &clock->outputs, link)
+		destroy_output(op);
+}
+
diff --git a/src/output.h b/src/output.h
new file mode 100644
index 0000000..0085bd7
--- /dev/null
+++ b/src/output.h
@@ -0,0 +1,33 @@
+#ifndef WLCLOCK_OUTPUT_H
+#define WLCLOCK_OUTPUT_H
+
+#include<wayland-server.h>
+
+struct Wlclock;
+struct Wlclock_surface;
+
+struct Wlclock_output
+{
+	struct wl_list  link;
+	struct Wlclock *clock;
+
+	struct wl_output      *wl_output;
+	struct zxdg_output_v1 *xdg_output;
+
+	char     *name;
+	uint32_t  global_name;
+	uint32_t  scale;
+
+	bool configured;
+
+	struct Wlclock_surface *surface;
+};
+
+bool create_output (struct Wlclock *clock, struct wl_registry *registry,
+		uint32_t name, const char *interface, uint32_t version);
+bool configure_output (struct Wlclock_output *output);
+struct Wlclock_output *get_output_from_global_name (struct Wlclock *clock, uint32_t name);
+void destroy_output (struct Wlclock_output *output);
+void destroy_all_outputs (struct Wlclock *clock);
+
+#endif
diff --git a/src/surface.c b/src/surface.c
new file mode 100644
index 0000000..9e6c8e2
--- /dev/null
+++ b/src/surface.c
@@ -0,0 +1,163 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<stdbool.h>
+#include<unistd.h>
+#include<string.h>
+
+#include<cairo/cairo.h>
+#include<wayland-server.h>
+#include<wayland-client.h>
+#include<wayland-client-protocol.h>
+
+#include"wlr-layer-shell-unstable-v1-protocol.h"
+#include"xdg-output-unstable-v1-protocol.h"
+#include"xdg-shell-protocol.h"
+
+#include"wlclock.h"
+#include"output.h"
+#include"misc.h"
+#include"surface.h"
+#include"buffer.h"
+
+static uint32_t min (uint32_t a, uint32_t b)
+{
+	return a > b ? b : a;
+}
+
+static void layer_surface_handle_configure (void *data,
+		struct zwlr_layer_surface_v1 *layer_surface, uint32_t serial,
+		uint32_t w, uint32_t h)
+{
+	struct Wlclock_surface *surface = (struct Wlclock_surface *)data;
+	clocklog(surface->output->clock, 1,
+			"[surface] Layer surface configure request: global_name=%d w=%d h=%d serial=%d\n",
+			surface->output->global_name, w, h, serial);
+	zwlr_layer_surface_v1_ack_configure(layer_surface, serial);
+	if ( w > 0 && h > 0 ) /* Try to fit as best as possible. */
+		surface->size = min(w, h);
+	surface->configured = true;
+	update_surface(surface);
+}
+
+static void layer_surface_handle_closed (void *data, struct zwlr_layer_surface_v1 *layer_surface)
+{
+	struct Wlclock_surface *surface = (struct Wlclock_surface *)data;
+	clocklog(surface->output->clock, 1,
+			"[surface] Layer surface has been closed: global_name=%d\n",
+			surface->output->global_name);
+	destroy_surface(surface);
+}
+
+const struct zwlr_layer_surface_v1_listener layer_surface_listener = {
+	.configure = layer_surface_handle_configure,
+	.closed    = layer_surface_handle_closed
+};
+
+static int32_t get_exclusive_zone (struct Wlclock_surface *surface)
+{
+	if ( surface->output->clock->exclusive_zone == 1 )
+		return surface->size;
+	return surface->output->clock->exclusive_zone;
+}
+
+static void configure_layer_surface (struct Wlclock_surface *surface)
+{
+	struct Wlclock *clock = surface->output->clock;
+	clocklog(clock, 1, "[surface] Configuring surface: global_name=%d\n",
+			surface->output->global_name);
+	zwlr_layer_surface_v1_set_size(surface->layer_surface,
+			surface->size, surface->size);
+	zwlr_layer_surface_v1_set_anchor(surface->layer_surface, clock->anchor);
+	zwlr_layer_surface_v1_set_margin(surface->layer_surface,
+			clock->margin_top, clock->margin_right,
+			clock->margin_bottom, clock->margin_left);
+	zwlr_layer_surface_v1_set_exclusive_zone(surface->layer_surface,
+			get_exclusive_zone(surface));
+	if (! clock->input)
+	{
+		struct wl_region *region = wl_compositor_create_region(clock->compositor);
+		wl_surface_set_input_region(surface->surface, region);
+		wl_region_destroy(region);
+	}
+}
+
+bool create_surface (struct Wlclock_output *output)
+{
+	struct Wlclock *clock = output->clock;
+	clocklog(clock, 1, "[surface] Creating surface: global_name=%d\n", output->global_name);
+
+	struct Wlclock_surface *surface = calloc(1, sizeof(struct Wlclock_surface));
+	if ( surface == NULL )
+	{
+		clocklog(NULL, 0, "ERROR: Could not allocate.\n");
+		return false;
+	}
+
+	output->surface        = surface;
+	surface->size          = clock->size;
+	surface->output        = output;
+	surface->surface       = NULL;
+	surface->layer_surface = NULL;
+	surface->configured    = false;
+
+	if ( NULL == (surface->surface = wl_compositor_create_surface(clock->compositor)) )
+	{
+		clocklog(NULL, 0, "ERROR: Compositor did not create wl_surface.\n");
+		return false;
+	}
+	if ( NULL == (surface->layer_surface = zwlr_layer_shell_v1_get_layer_surface(
+					clock->layer_shell, surface->surface,
+					output->wl_output, clock->layer,
+					clock->namespace)) )
+	{
+		clocklog(NULL, 0, "ERROR: Compositor did not create layer_surface.\n");
+		return false;
+	}
+
+	configure_layer_surface(surface);
+	zwlr_layer_surface_v1_add_listener(surface->layer_surface,
+			&layer_surface_listener, surface);
+	wl_surface_commit(surface->surface);
+
+	return true;
+}
+
+void destroy_surface (struct Wlclock_surface *surface)
+{
+	if ( surface == NULL )
+		return;
+	if ( surface->layer_surface != NULL )
+		zwlr_layer_surface_v1_destroy(surface->layer_surface);
+	if ( surface->surface != NULL )
+		wl_surface_destroy(surface->surface);
+	finish_buffer(&surface->buffers[0]);
+	finish_buffer(&surface->buffers[1]);
+	free(surface);
+}
+
+void destroy_all_surfaces (struct Wlclock *clock)
+{
+	clocklog(clock, 1, "[surface] Destroying all surfaces.\n");
+	struct Wlclock_output *op, *tmp;
+	wl_list_for_each_safe(op, tmp, &clock->outputs, link)
+		if ( op->surface != NULL )
+			destroy_surface(op->surface);
+}
+
+void update_surface (struct Wlclock_surface *surface)
+{
+	if ( surface == NULL || ! surface->configured )
+		return;
+	configure_layer_surface(surface);
+	// render_surface_frame(surface); // TODO
+	wl_surface_commit(surface->surface);
+}
+
+void update_all_surfaces (struct Wlclock *clock)
+{
+	clocklog(clock, 1, "[surface] Updating all surfaces.\n");
+	struct Wlclock_output *op, *tmp;
+	wl_list_for_each_safe(op, tmp, &clock->outputs, link)
+		if ( op->surface != NULL )
+			update_surface(op->surface);
+}
diff --git a/src/surface.h b/src/surface.h
new file mode 100644
index 0000000..8fd99bc
--- /dev/null
+++ b/src/surface.h
@@ -0,0 +1,31 @@
+#ifndef WLCLOCK_SURFACE_H
+#define WLCLOCK_SURFACE_H
+
+#include<wayland-server.h>
+
+#include"buffer.h"
+
+#include<stdint.h>
+#include<stdbool.h>
+
+struct Wlclock;
+struct Wlclock_output;
+
+struct Wlclock_surface
+{
+	struct Wlclock_output        *output;
+	struct wl_surface            *surface;
+	struct zwlr_layer_surface_v1 *layer_surface;
+
+	int32_t size;
+	struct Wlclock_buffer buffers[2];
+	bool configured;
+};
+
+bool create_surface (struct Wlclock_output *output);
+void destroy_surface (struct Wlclock_surface *surface);
+void destroy_all_surfaces (struct Wlclock *clock);
+void update_surface (struct Wlclock_surface *surface);
+void update_all_surfaces (struct Wlclock *clock);
+
+#endif
diff --git a/src/wlclock.c b/src/wlclock.c
new file mode 100644
index 0000000..a676285
--- /dev/null
+++ b/src/wlclock.c
@@ -0,0 +1,298 @@
+#include<errno.h>
+#include<getopt.h>
+#include<poll.h>
+#include<stdbool.h>
+#include<stdio.h>
+#include<stdlib.h>
+#include<string.h>
+#include<unistd.h>
+
+#if HANDLE_SIGNALS
+#include<sys/signalfd.h>
+#include<signal.h>
+#endif
+
+#include<wayland-server.h>
+#include<wayland-client.h>
+#include<wayland-client-protocol.h>
+
+#include"wlr-layer-shell-unstable-v1-protocol.h"
+#include"xdg-output-unstable-v1-protocol.h"
+#include"xdg-shell-protocol.h"
+
+#include"wlclock.h"
+#include"misc.h"
+#include"output.h"
+#include"surface.h"
+
+static void registry_handle_global (void *data, struct wl_registry *registry,
+		uint32_t name, const char *interface, uint32_t version)
+{
+	struct Wlclock *clock = (struct Wlclock *)data;
+
+	if (! strcmp(interface, wl_compositor_interface.name))
+	{
+		clocklog(clock, 2, "[main] Get wl_compositor.\n");
+		clock->compositor = wl_registry_bind(registry, name, &wl_compositor_interface, 4);
+	}
+	else if (! strcmp(interface, wl_shm_interface.name))
+	{
+		clocklog(clock, 2, "[main] Get wl_shm.\n");
+		clock->shm = wl_registry_bind(registry, name, &wl_shm_interface, 1);
+	}
+	else if (! strcmp(interface, zwlr_layer_shell_v1_interface.name))
+	{
+		clocklog(clock, 2, "[main] Get zwlr_layer_shell_v1.\n");
+		clock->layer_shell = wl_registry_bind(registry, name, &zwlr_layer_shell_v1_interface, 1);
+	}
+	else if (! strcmp(interface, zxdg_output_manager_v1_interface.name))
+	{
+		clocklog(clock, 2, "[main] Get zxdg_output_manager_v1.\n");
+		clock->xdg_output_manager = wl_registry_bind(registry, name, &zxdg_output_manager_v1_interface, 3);
+	}
+	else if (! strcmp(interface, wl_output_interface.name))
+	{
+		if (! create_output(data, registry, name, interface, version))
+			goto error;
+	}
+
+	return;
+error:
+	clock->loop = false;
+	clock->ret  = EXIT_FAILURE;
+}
+
+static void registry_handle_global_remove (void *data,
+		struct wl_registry *registry, uint32_t name)
+{
+	struct Wlclock *clock = (struct Wlclock *)data;
+	clocklog(clock, 1, "[main] Global remove.\n");
+	destroy_output(get_output_from_global_name(clock, name));
+}
+
+static const struct wl_registry_listener registry_listener = {
+	.global        = registry_handle_global,
+	.global_remove = registry_handle_global_remove
+};
+
+/* Helper function for capability support error message. */
+static bool capability_test (void *ptr, const char *name)
+{
+	if ( ptr != NULL )
+		return true;
+	clocklog(NULL, 0, "ERROR: Wayland compositor does not support %s.\n", name);
+	return false;
+}
+
+static bool init_wayland (struct Wlclock *clock)
+{
+	clocklog(clock, 1, "[main] Init Wayland.\n");
+
+	/* Connect to Wayland server. */
+	clocklog(clock, 2, "[main] Connecting to server.\n");
+	if ( NULL == (clock->display = wl_display_connect(NULL)) )
+	{
+		clocklog(NULL, 0, "ERROR: Can not connect to a Wayland server.\n");
+		return false;
+	}
+
+	/* Get registry and add listeners. */
+	clocklog(clock, 2, "[main] Get wl_registry.\n");
+	if ( NULL == (clock->registry = wl_display_get_registry(clock->display)) )
+	{
+		clocklog(NULL, 0, "ERROR: Can not get registry.\n");
+		return false;
+	}
+	wl_registry_add_listener(clock->registry, &registry_listener, clock);
+
+	/* Allow registry listeners to catch up. */
+	if ( wl_display_roundtrip(clock->display) == -1 )
+	{
+		clocklog(NULL, 0, "ERROR: Roundtrip failed.\n");
+		return false;
+	}
+
+	/* Testing compatibilities. */
+	if (! capability_test(clock->compositor, "wl_compositor"))
+		return false;
+	if (! capability_test(clock->shm, "wl_shm"))
+		return false;
+	if (! capability_test(clock->layer_shell, "zwlr_layer_shell"))
+		return false;
+	if (! capability_test(clock->xdg_output_manager, "xdg_output_manager"))
+		return false;
+
+	clocklog(clock, 2, "[main] Catching up on output configuration.\n");
+	struct Wlclock_output *op;
+	wl_list_for_each(op, &clock->outputs, link)
+		if ( ! op->configured && ! configure_output(op) )
+			return false;
+
+	return true;
+}
+
+/* Finish him! */
+static void finish_wayland (struct Wlclock *clock)
+{
+	clocklog(clock, 1, "[main] Finish Wayland.\n");
+
+	destroy_all_outputs(clock);
+
+	clocklog(clock, 2, "[main] Destroying Wayland objects.\n");
+	if ( clock->layer_shell != NULL )
+		zwlr_layer_shell_v1_destroy(clock->layer_shell);
+	if ( clock->compositor != NULL )
+		wl_compositor_destroy(clock->compositor);
+	if ( clock->shm != NULL )
+		wl_shm_destroy(clock->shm);
+	if ( clock->registry != NULL )
+		wl_registry_destroy(clock->registry);
+
+	if ( clock->display != NULL )
+	{
+		clocklog(clock, 2, "[main] Diconnecting from server.\n");
+		wl_display_disconnect(clock->display);
+	}
+}
+
+static bool handle_command_flags (struct Wlclock *clock, int argc, char *argv[])
+{
+	static struct option opts[] = {
+		{"help",     no_argument,       NULL, 'h'},
+		{"verbose",  no_argument,       NULL, 'v'},
+		{"version",  no_argument,       NULL, 'V'},
+
+		{"output",   required_argument, NULL, 100},
+		{"no-input", no_argument,       NULL, 101}
+	};
+
+	const char *usage =
+		"Usage: wlclock [options]\n"
+		"\n"
+		"  -h, --help      Show this helptext.\n"
+		"  -v, --verbose   Increase verbosity of output.\n"
+		"  -V, --version   Show the version.\n"
+		"      --output    Name of output the clock should be displayed on.\n"
+		"      --no-input  The clock surface will not catch input events.\n"
+		"\n";
+
+	int opt;
+	extern int optind;
+	extern char *optarg;
+	while ( (opt = getopt_long(argc, argv, "hvV", opts, &optind)) != -1 ) switch (opt)
+	{
+		case 'h':
+			fputs(usage, stderr);
+			clock->ret = EXIT_SUCCESS;
+			return false;
+
+		case 'v':
+			clock->verbosity++;
+			break;
+
+		case 'V':
+			fputs("wlclock version " VERSION "\n", stderr);
+			clock->ret = EXIT_SUCCESS;
+			return false;
+
+		case 100:
+			set_string(&clock->output, optarg);
+			break;
+
+		case 101:
+			clock->input = false;
+			break;
+
+		default:
+			return false;
+	}
+
+	return true;
+}
+
+static time_t get_timeout (time_t now)
+{
+	return ((now / 60 * 60 ) + 60 - now) * 1000;
+}
+
+static void clock_run (struct Wlclock *clock)
+{
+	clocklog(clock, 1, "[main] Starting loop.\n");
+
+	clock->ret = EXIT_SUCCESS;
+
+	struct pollfd fds[] = {
+		{ .fd = wl_display_get_fd(clock->display), .events = POLLIN }
+	};
+
+	while (clock->loop)
+	{
+		/* Flush Wayland events. */
+		errno = 0;
+		do {
+			if ( wl_display_flush(clock->display) == 1 && errno != EAGAIN )
+			{
+				clocklog(NULL, 0, "ERROR: wl_display_flush: %s\n",
+						strerror(errno));
+				break;
+			}
+		} while ( errno == EAGAIN );
+
+		clock->now = time(NULL);
+		errno = 0;
+		int ret = poll(fds, 1, get_timeout(clock->now));
+
+		if ( ret == 0 )
+			update_all_surfaces(clock);
+		else if ( ret > 0 )
+		{
+			if ( fds[0].revents & POLLIN && wl_display_dispatch(clock->display) == -1 )
+			{
+				clocklog(NULL, 0, "ERROR: wl_display_flush: %s\n", strerror(errno));
+				goto error;
+			}
+			if ( fds[0].revents & POLLOUT && wl_display_flush(clock->display) == -1 )
+			{
+				clocklog(NULL, 0, "ERROR: wl_display_flush: %s\n", strerror(errno));
+				goto error;
+			}
+		}
+		else
+			clocklog(NULL, 0, "ERROR: poll: %s\n", strerror(errno));
+	}
+
+	return;
+error:
+	clock->ret = EXIT_FAILURE;
+	return;
+}
+
+int main (int argc, char *argv[])
+{
+	struct Wlclock clock = { 0 };
+	clock.ret = EXIT_FAILURE;
+	clock.loop = true;
+	clock.verbosity = 0;
+	clock.size = 100;
+	clock.exclusive_zone = 1;
+	clock.input = true;
+	clock.layer = ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM;
+	clock.anchor = ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM;
+	set_string(&clock.namespace, "wlclock");
+	wl_list_init(&clock.outputs);
+
+	if (! handle_command_flags(&clock, argc, argv))
+		return clock.ret;
+
+	clocklog(&clock, 1, "[main] wlclock: version=%s\n", VERSION);
+
+	if (! init_wayland(&clock))
+		goto exit;
+
+	clock_run(&clock);
+
+exit:
+	finish_wayland(&clock);
+	return clock.ret;
+}
+
diff --git a/src/wlclock.h b/src/wlclock.h
new file mode 100644
index 0000000..684c4b3
--- /dev/null
+++ b/src/wlclock.h
@@ -0,0 +1,40 @@
+#ifndef WLCLOCK_WLCLOCK_H
+#define WLCLOCK_WLCLOCK_H
+
+#include<stdbool.h>
+#include<stdint.h>
+#include<time.h>
+#include<wayland-server.h>
+
+#include"wlr-layer-shell-unstable-v1-protocol.h"
+
+struct Wlclock
+{
+	struct wl_display             *display;
+	struct wl_registry            *registry;
+	struct wl_compositor          *compositor;
+	struct wl_shm                 *shm;
+	struct zwlr_layer_shell_v1    *layer_shell;
+	struct zxdg_output_manager_v1 *xdg_output_manager;
+
+	struct wl_list outputs;
+	char *output;
+
+	time_t now;
+
+	bool loop;
+	int  verbosity;
+	int  ret;
+
+	enum zwlr_layer_shell_v1_layer layer;
+	uint32_t size;
+	char *namespace;
+	int32_t exclusive_zone;
+	uint32_t border_top, border_right, border_bottom, border_left;
+	uint32_t margin_top, margin_right, margin_bottom, margin_left;
+	uint32_t radius_top_left, radius_top_right, radius_bottom_left, radius_bottom_right;
+	uint32_t anchor;
+	bool input;
+};
+
+#endif