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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
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<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
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
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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
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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>.

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SCANNER := wayland-scanner
PREFIX=/usr/local
BINDIR=$(PREFIX)/bin
DATADIR=$(PREFIX)/share
MANDIR=$(DATADIR)/man
CFLAGS=-g -Wall -Werror -Wextra -Wpedantic -Wno-unused-parameter $\
-Wno-overlength-strings -Wconversion -Wformat-security -Wformat $\
-Wsign-conversion -Wfloat-conversion -Wunused-result $\
$(shell pkg-config --cflags wayland-client) $\
$(shell guile-config compile)
LIBS=-lrt $\
$(shell pkg-config --libs wayland-client) $\
$(shell guile-config link)
OBJ=riverguile.o river-layout-v3.o
GEN=river-layout-v3.c river-layout-v3.h
all: riverguile
riverguile: $(OBJ)
$(CC) $(LDFLAGS) -g -o $@ $(OBJ) $(LIBS)
$(OBJ): $(GEN)
%.c: %.xml
$(SCANNER) private-code < $< > $@
%.h: %.xml
$(SCANNER) client-header < $< > $@
install: riverguile
install -D riverguile $(DESTDIR)$(BINDIR)/riverguile
install -m 644 -D riverguile.1 $(DESTDIR)$(MANDIR)/man1/riverguile.1
uninstall:
$(RM) $(DESTDIR)$(BINDIR)/riverguile
$(RM) $(DESTDIR)$(MANDIR)/man1/riverguile.1
clean:
$(RM) riverguile
$(RM) $(GEN)
$(RM) $(OBJ)
$(RM) $(IMG)
.PHONY: clean install uninstall all

196
river-layout-v3.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<protocol name="river_layout_v3">
<copyright>
Copyright 2020-2021 The River Developers
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, 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>
<description summary="let clients propose view positions and dimensions">
This protocol specifies a way for clients to propose arbitrary positions
and dimensions for a set of views on a specific output of a compositor
through the river_layout_v3 object.
Layouts are a strictly linear list of views, the position and dimensions
of which are supplied by the client. Any complex underlying data structure
a client may use when generating the layout is lost in transmission. This
is an intentional limitation.
Additionally, this protocol allows the compositor to deliver arbitrary
user-provided commands associated with a layout to clients. A client
may use these commands to implement runtime configuration/control, or
may ignore them entirely. How the user provides these commands to the
compositor is not specified by this protocol and left to compositor policy.
Warning! The protocol described in this file is currently in the
testing phase. Backward compatible changes may be added together with
the corresponding interface version bump. Backward incompatible changes
can only be done by creating a new major version of the extension.
</description>
<interface name="river_layout_manager_v3" version="2">
<description summary="manage river layout objects">
A global factory for river_layout_v3 objects.
</description>
<request name="destroy" type="destructor">
<description summary="destroy the river_layout_manager object">
This request indicates that the client will not use the
river_layout_manager object any more. Objects that have been created
through this instance are not affected.
</description>
</request>
<request name="get_layout">
<description summary="create a river_layout_v3 object">
This creates a new river_layout_v3 object for the given wl_output.
All layout related communication is done through this interface.
The namespace is used by the compositor to decide which river_layout_v3
object will receive layout demands for the output.
The namespace is required to be be unique per-output. Furthermore,
two separate clients may not share a namespace on separate outputs. If
these conditions are not upheld, the the namespace_in_use event will
be sent directly after creation of the river_layout_v3 object.
</description>
<arg name="id" type="new_id" interface="river_layout_v3"/>
<arg name="output" type="object" interface="wl_output"/>
<arg name="namespace" type="string" summary="namespace of the layout object"/>
</request>
</interface>
<interface name="river_layout_v3" version="2">
<description summary="receive and respond to layout demands">
This interface allows clients to receive layout demands from the
compositor for a specific output and subsequently propose positions and
dimensions of individual views.
</description>
<enum name="error">
<entry name="count_mismatch" value="0" summary="number of
proposed dimensions does not match number of views in layout"/>
<entry name="already_committed" value="1" summary="the layout demand with
the provided serial was already committed"/>
</enum>
<request name="destroy" type="destructor">
<description summary="destroy the river_layout_v3 object">
This request indicates that the client will not use the river_layout_v3
object any more.
</description>
</request>
<event name="namespace_in_use">
<description summary="the requested namespace is already in use">
After this event is sent, all requests aside from the destroy event
will be ignored by the server. If the client wishes to try again with
a different namespace they must create a new river_layout_v3 object.
</description>
</event>
<event name="layout_demand">
<description summary="the compositor requires a layout">
The compositor sends this event to inform the client that it requires a
layout for a set of views.
The usable width and height indicate the space in which the client
can safely position views without interfering with desktop widgets
such as panels.
The serial of this event is used to identify subsequent requests as
belonging to this layout demand. Beware that the client might need
to handle multiple layout demands at the same time.
The server will ignore responses to all but the most recent layout
demand. Thus, clients are only required to respond to the most recent
layout_demand received. If a newer layout_demand is received before
the client has finished responding to an old demand, the client should
abort work on the old demand as any further work would be wasted.
</description>
<arg name="view_count" type="uint" summary="number of views in the layout"/>
<arg name="usable_width" type="uint" summary="width of the usable area"/>
<arg name="usable_height" type="uint" summary="height of the usable area"/>
<arg name="tags" type="uint" summary="tags of the output, 32-bit bitfield"/>
<arg name="serial" type="uint" summary="serial of the layout demand"/>
</event>
<request name="push_view_dimensions">
<description summary="propose dimensions of the next view">
This request proposes a size and position for a view in the layout demand
with matching serial.
A client must send this request for every view that is part of the
layout demand. The number of views in the layout is given by the
view_count argument of the layout_demand event. Pushing too many or
too few view dimensions is a protocol error.
The x and y coordinates are relative to the usable area of the output,
with (0,0) as the top left corner.
</description>
<arg name="x" type="int" summary="x coordinate of view"/>
<arg name="y" type="int" summary="y coordinate of view"/>
<arg name="width" type="uint" summary="width of view"/>
<arg name="height" type="uint" summary="height of view"/>
<arg name="serial" type="uint" summary="serial of layout demand"/>
</request>
<request name="commit">
<description summary="commit a layout">
This request indicates that the client is done pushing dimensions
and the compositor may apply the layout. This completes the layout
demand with matching serial, any other requests sent with the serial
are a protocol error.
The layout_name argument is a user-facing name or short description
of the layout that is being committed. The compositor may for example
display this on a status bar, though what exactly is done with it is
left to the compositor's discretion.
The compositor is free to use this proposed layout however it chooses,
including ignoring it.
</description>
<arg name="layout_name" type="string" summary="name of committed layout"/>
<arg name="serial" type="uint" summary="serial of layout demand"/>
</request>
<event name="user_command">
<description summary="a command sent by the user">
This event informs the client of a command sent to it by the user.
The semantic meaning of the command is left for the client to
decide. It is also free to ignore it entirely if it so chooses.
A layout_demand will be sent after this event if the compositor is
currently using this layout object to arrange the output.
If version 2 or higher of the river_layout_v3 object is bound, the
user_command_tags event is guaranteed to be sent directly before the
user_command event.
</description>
<arg name="command" type="string"/>
</event>
<event name="user_command_tags" since="2">
<description summary="a command sent by the user">
If version 2 or higher of the river_layout_v3 object is bound, this
event will be sent directly before every user_command event. This allows
layout generators to be aware of the active tags when a user command is
sent. This is necessary for generators wanting to keep settings on a
per-tag basis.
</description>
<arg name="tags" type="uint" summary="tags of the output, 32-bit bitfield"/>
</event>
</interface>
</protocol>

286
riverguile.c Normal file
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#include <ctype.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <setjmp.h>
#include <wayland-client.h>
#ifdef __linux__
#include <features.h>
#include <linux/landlock.h>
#include <sys/syscall.h>
#ifdef __GLIBC__
#include<execinfo.h>
#endif
#endif
#include "river-layout-v3.h"
bool loop = true;
int ret = EXIT_SUCCESS;
jmp_buf skip_main_loop;
struct wl_display *wl_display = NULL;
struct wl_registry *wl_registry = NULL;
struct wl_callback *sync_callback = NULL;
struct river_layout_manager_v3 *layout_manager = NULL;
struct wl_list outputs;
struct Output
{
struct wl_list link;
struct wl_output *wl_output;
struct river_layout_v3 *layout;
uint32_t name;
bool configured;
};
static void layout_handle_layout_demand (void *data, struct river_layout_v3 *river_layout_v3,
uint32_t view_count, uint32_t width, uint32_t height, uint32_t tags, uint32_t serial)
{
struct Output *output = (struct Output *)data;
for (size_t i = 0; i < view_count; i++)
{
river_layout_v3_push_view_dimensions(
output->layout, 0, 0,
width, height, serial
);
}
river_layout_v3_commit(output->layout, "()", serial);
}
static void layout_handle_namespace_in_use (void *data, struct river_layout_v3 *river_layout_v3)
{
fputs("ERROR: Namespace already in use.\n", stderr);
ret = EXIT_FAILURE;
loop = false;
}
static void layout_handle_user_command (void *data,
struct river_layout_v3 *river_layout_manager_v3,
const char *command)
{
}
static const struct river_layout_v3_listener layout_listener = {
.namespace_in_use = layout_handle_namespace_in_use,
.layout_demand = layout_handle_layout_demand,
.user_command = layout_handle_user_command,
};
static void output_configure (struct Output *output)
{
if ( layout_manager == NULL )
return;
if (output->configured)
return;
output->layout = river_layout_manager_v3_get_layout(
layout_manager, output->wl_output, "riverguile"
);
river_layout_v3_add_listener(output->layout, &layout_listener, output);
output->configured = true;
}
static struct Output *output_create (struct wl_output *wl_output)
{
struct Output *output = calloc(1, sizeof(struct Output));
if ( output == NULL )
{
fprintf(stderr, "ERROR: calloc: %s\n", strerror(errno));
return NULL;
}
output->wl_output = wl_output;
output_configure(output);
return output;
}
static void output_destroy (struct Output *output)
{
if ( output->layout != NULL )
river_layout_v3_destroy(output->layout);
assert(output->wl_output != NULL);
wl_output_destroy(output->wl_output);
free(output);
}
static void registry_handle_global (void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version)
{
if ( strcmp(interface, river_layout_manager_v3_interface.name) == 0 )
{
layout_manager = wl_registry_bind(
registry, name, &river_layout_manager_v3_interface, 1
);
}
else if ( strcmp(interface, wl_output_interface.name) == 0 )
{
struct wl_output *wl_output = wl_registry_bind(
registry, name, &wl_output_interface, 1
);
struct Output *output = output_create(wl_output);
if ( output == NULL )
{
wl_output_destroy(wl_output);
ret = EXIT_FAILURE;
loop = false;
return;
}
wl_list_insert(&outputs, &output->link);
}
}
static void registry_handle_global_remove (void *data, struct wl_registry *registry,
uint32_t name)
{
struct Output *output, *tmp;
wl_list_for_each_safe(output, tmp, &outputs, link)
{
if ( output->name != name )
continue;
wl_list_remove(&output->link);
output_destroy(output);
return;
}
}
static const struct wl_registry_listener registry_listener = {
.global = registry_handle_global,
.global_remove = registry_handle_global_remove,
};
static void sync_handle_done (void *data, struct wl_callback *wl_callback, uint32_t other_data)
{
wl_callback_destroy(wl_callback);
sync_callback = NULL;
if ( layout_manager == NULL )
{
fputs("ERROR: Wayland server does not support river-layout-v3.\n", stderr);
ret = EXIT_FAILURE;
loop = false;
return;
}
/* If outputs were registered before the river_layout_manager is
* available, they won't have a river_layout, so we need to create
* those here.
*/
struct Output *output;
wl_list_for_each(output, &outputs, link)
output_configure(output);
}
static const struct wl_callback_listener sync_callback_listener = {
.done = sync_handle_done,
};
static void handle_interrupt (int signum)
{
fputs("Killed.\n", stderr);
loop = false;
longjmp(skip_main_loop, 1);
}
/**
* Intercept error signals (like SIGSEGV and SIGFPE) so that we can try to
* print a fancy error message and a backtracke before letting the system kill us.
*/
static void handle_error (int signum)
{
const char *msg =
"\n"
"┌──────────────────────────────────────────┐\n"
"│ │\n"
"│ riverguile has crashed. │\n"
"│ │\n"
"│ This is most likely a bug, so please │\n"
"│ report this to the mailing list. │\n"
"│ │\n"
"│ ~leon_plickat/public-inbox@lists.sr.ht │\n"
"│ │\n"
"└──────────────────────────────────────────┘\n"
"\n";
fputs(msg, stderr);
/* Set up the default handlers to deal with the rest. We do this before
* attempting to get a backtrace, because sometimes that could also
* cause a SEGFAULT and we don't want a funny signal loop to happen.
*/
signal(signum, SIG_DFL);
#ifdef __linux__
#ifdef __GLIBC__
fputs("Attempting to get backtrace:\n", stderr);
void *buffer[255];
const int calls = backtrace(buffer, sizeof(buffer) / sizeof(void *));
backtrace_symbols_fd(buffer, calls, fileno(stderr));
fputs("\n", stderr);
#endif
#endif
/* Easiest way of calling the default signal handler. */
kill(getpid(), signum);
}
int main(int argc, char *argv[])
{
signal(SIGSEGV, handle_error);
signal(SIGFPE, handle_error);
signal(SIGINT, handle_interrupt);
wl_list_init(&outputs);
/* We query the display name here instead of letting wl_display_connect()
* figure it out itself, because libwayland (for legacy reasons) falls
* back to using "wayland-0" when $WAYLAND_DISPLAY is not set, which is
* generally not desirable.
*/
const char *display_name = getenv("WAYLAND_DISPLAY");
if ( display_name == NULL )
{
fputs("ERROR: WAYLAND_DISPLAY is not set.\n", stderr);
ret = EXIT_FAILURE;
goto cleanup;
}
wl_display = wl_display_connect(display_name);
if ( wl_display == NULL )
{
fputs("ERROR: Can not connect to wayland display.\n", stderr);
ret = EXIT_FAILURE;
goto cleanup;
}
wl_registry = wl_display_get_registry(wl_display);
wl_registry_add_listener(wl_registry, &registry_listener, NULL);
sync_callback = wl_display_sync(wl_display);
wl_callback_add_listener(sync_callback, &sync_callback_listener, NULL);
if ( setjmp(skip_main_loop) == 0 )
while ( loop && wl_display_dispatch(wl_display) > 0 );
struct Output *output, *tmp;
cleanup:
wl_list_for_each_safe(output, tmp, &outputs, link)
{
wl_list_remove(&output->link);
output_destroy(output);
}
if ( sync_callback != NULL )
wl_callback_destroy(sync_callback);
if ( wl_registry != NULL )
wl_registry_destroy(wl_registry);
wl_display_disconnect(wl_display);
return ret;
}