wlopm/wlopm.c

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/*
* wlopm - Wayland output power manager
*
* Copyright (C) 2021 Leon Henrik Plickat
*
* 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/>.
*/
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <wayland-client.h>
#include "xdg-output-unstable-v1.h"
#include "wlr-output-power-management-unstable-v1.h"
#define VERSION "0.0.1"
const char usage[] =
"Usage:\n"
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"\twlopm List outputs and their power modes.\n"
"\twlopm on <output-name> Set output power mode to on.\n"
"\twlopm off <output-name> Set output power mode to off.\n"
"\twlopm toggle <output-name> Toggle output power mode.\n"
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"\n";
enum Action
{
LIST,
ON,
OFF,
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TOGGLE,
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};
enum Action action = LIST;
char *name = NULL;
struct Output
{
struct wl_list link;
struct wl_output *wl_output;
struct zxdg_output_v1 *xdg_output;
struct zwlr_output_power_v1 *wlr_output_power;
enum zwlr_output_power_v1_mode mode;
char *name;
uint32_t global_name;
};
struct wl_display *wl_display = NULL;
struct wl_registry *wl_registry = NULL;
struct wl_callback *sync_callback = NULL;
struct wl_list outputs;
struct zxdg_output_manager_v1 *xdg_output_manager = NULL;
struct zwlr_output_power_manager_v1 *wlr_output_power_manager = NULL;
int ret = EXIT_SUCCESS;
bool loop = true;
static void noop () {}
static void wlr_output_power_handle_mode (void *data, struct zwlr_output_power_v1 *wlr_output_power,
enum zwlr_output_power_v1_mode mode)
{
struct Output *output = (struct Output *)data;
output->mode = mode;
}
static void wlr_output_power_handle_failed (void *data, struct zwlr_output_power_v1 *wlr_output_power)
{
struct Output *output = (struct Output *)data;
fprintf(stderr, "ERROR: Setting mode for output \"%s\" failed.\n", output->name);
loop = false;
ret = EXIT_FAILURE;
}
static const struct zwlr_output_power_v1_listener wlr_output_power_listener = {
.mode = wlr_output_power_handle_mode,
.failed = wlr_output_power_handle_failed,
};
static void xdg_output_handle_name (void *data, struct zxdg_output_v1 *xdg_output,
const char *name)
{
struct Output *output = (struct Output *)data;
if ( output->name != NULL )
free(output->name);
output->name = strdup(name);
}
static const struct zxdg_output_v1_listener xdg_output_listener = {
.logical_size = noop,
.name = xdg_output_handle_name,
.logical_position = noop,
.description = noop,
.done = noop, /* Deprecated since version 3. */
};
static void registry_handle_global (void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version)
{
if ( strcmp(interface, wl_output_interface.name) == 0 )
{
struct Output *output = calloc(1, sizeof(struct Output));
if ( output == NULL )
{
fputs("ERROR: Failed to allocate.\n", stderr);
return;
}
output->wl_output = wl_registry_bind(registry, name,
&wl_output_interface, version);
output->xdg_output = NULL;
output->wlr_output_power = NULL;
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output->name = NULL;
output->global_name = name;
wl_list_insert(&outputs, &output->link);
}
else if ( strcmp(interface, zxdg_output_manager_v1_interface.name) == 0 )
xdg_output_manager = wl_registry_bind(registry, name,
&zxdg_output_manager_v1_interface, version);
else if ( strcmp(interface, zwlr_output_power_manager_v1_interface.name) == 0 )
wlr_output_power_manager = wl_registry_bind(registry, name,
&zwlr_output_power_manager_v1_interface, version);
}
static const struct wl_registry_listener registry_listener = {
.global = registry_handle_global,
.global_remove = noop, /* We don't run long enough to care. */
};
static void sync_handle_done (void *data, struct wl_callback *wl_callback, uint32_t other_data);
static const struct wl_callback_listener sync_callback_listener = {
.done = sync_handle_done,
};
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static struct Output *output_from_name (const char *str)
{
struct Output *output;
wl_list_for_each(output, &outputs, link)
if ( strcmp(output->name, name) == 0 )
return output;
return NULL;
}
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static void sync_handle_done (void *data, struct wl_callback *wl_callback, uint32_t other_data)
{
wl_callback_destroy(wl_callback);
sync_callback = NULL;
static int sync = 0;
if ( sync == 0 )
{
if ( wlr_output_power_manager == NULL )
{
fputs("ERROR: Wayland server does not support wlr-output-power-management-v1.\n", stderr);
loop = false;
ret = EXIT_FAILURE;
return;
}
if ( xdg_output_manager == NULL )
{
fputs("ERROR: Wayland server does not support xdg-output.\n", stderr);
loop = false;
ret = EXIT_FAILURE;
return;
}
struct Output *output;
wl_list_for_each(output, &outputs, link)
{
output->xdg_output = zxdg_output_manager_v1_get_xdg_output(
xdg_output_manager, output->wl_output);
zxdg_output_v1_add_listener(output->xdg_output,
&xdg_output_listener, output);
output->wlr_output_power = zwlr_output_power_manager_v1_get_output_power(
wlr_output_power_manager, output->wl_output);
zwlr_output_power_v1_add_listener(output->wlr_output_power,
&wlr_output_power_listener, output);
}
sync_callback = wl_display_sync(wl_display);
wl_callback_add_listener(sync_callback, &sync_callback_listener, NULL);
}
else if ( sync == 1 )
{
if ( action == LIST )
{
struct Output *output;
wl_list_for_each(output, &outputs, link)
fprintf(stdout, "%s %s\n", output->name,
output->mode == ZWLR_OUTPUT_POWER_V1_MODE_ON ? "on" : "off");
loop = false;
}
else
{
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const struct Output *output = output_from_name(name);
if ( output == NULL )
{
fprintf(stdout, "ERROR: No output with name \"%s\".\n", name);
ret = EXIT_FAILURE;
loop = false;
return;
}
enum zwlr_output_power_v1_mode new_mode;
switch (action)
{
case ON:
new_mode = ZWLR_OUTPUT_POWER_V1_MODE_ON;
break;
case OFF:
new_mode = ZWLR_OUTPUT_POWER_V1_MODE_OFF;
break;
case TOGGLE:
if ( output->mode == ZWLR_OUTPUT_POWER_V1_MODE_ON )
new_mode = ZWLR_OUTPUT_POWER_V1_MODE_OFF;
else
new_mode = ZWLR_OUTPUT_POWER_V1_MODE_ON;
break;
case LIST:
/* unreachable */
break;
}
zwlr_output_power_v1_set_mode(output->wlr_output_power, new_mode);
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/* We need to sync yet another time because setting the
* power mode might fail.
*/
sync_callback = wl_display_sync(wl_display);
wl_callback_add_listener(sync_callback, &sync_callback_listener, NULL);
}
}
else
loop = false;
sync++;
}
int main(int argc, char *argv[])
{
if ( argc == 3 )
{
if ( strcmp(argv[1], "on") == 0 )
action = ON;
else if ( strcmp(argv[1], "off") == 0 )
action = OFF;
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else if ( strcmp(argv[1], "toggle") == 0 )
action = TOGGLE;
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else
{
fputs(usage, stderr);
return EXIT_FAILURE;
}
name = strdup(argv[2]);
}
else if ( argc != 1 )
{
fputs(usage, stderr);
return EXIT_FAILURE;
}
/* 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);
if ( name != NULL )
free(name);
return EXIT_FAILURE;
}
wl_display = wl_display_connect(display_name);
if ( wl_display == NULL )
{
fputs("ERROR: Can not connect to wayland display.\n", stderr);
if ( name != NULL )
free(name);
return EXIT_FAILURE;
}
wl_list_init(&outputs);
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);
while ( loop && wl_display_dispatch(wl_display) > 0 );
struct Output *output, *tmp;
wl_list_for_each_safe(output, tmp, &outputs, link)
{
if ( output->wlr_output_power != NULL )
zwlr_output_power_v1_destroy(output->wlr_output_power);
if ( output->xdg_output != NULL )
zxdg_output_v1_destroy(output->xdg_output);
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wl_output_destroy(output->wl_output);
wl_list_remove(&output->link);
free(output->name);
free(output);
}
if ( name != NULL )
free(name);
if ( sync_callback != NULL )
wl_callback_destroy(sync_callback);
if ( wlr_output_power_manager != NULL )
zwlr_output_power_manager_v1_destroy(wlr_output_power_manager);
if ( xdg_output_manager != NULL )
zxdg_output_manager_v1_destroy(xdg_output_manager);
if ( wl_registry != NULL )
wl_registry_destroy(wl_registry);
wl_display_disconnect(wl_display);
return ret;
}