wlmcpugraph.c File Reference

#include "wlm_graph_shared.h"
#include <ctype.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libbase/libbase.h>

Include dependency graph for wlmcpugraph.c:

Classes
struct	cpu_times_t
struct	cpugraph_state_t

Macros
#define	LINE_BUFFER_SIZE   256

Functions
static bool	_cpu_state_arrays_alloc (cpugraph_state_t *state, const uint32_t cpu_usage_num)
static void	_state_free (void *app_state)
static wlm_graph_read_result_t	_stats_read_fn (void *app_state, wlm_graph_values_t *values)
int	main (const int argc, const char **argv)

Variables
static const char	_app_name [] = "wlmcpugraph"
static const char	_app_help []

Detailed Description

CPU usage graph dock-app for wlmaker.

Copyright

Copyright 2026 Google LLC

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Macro Definition Documentation

LINE_BUFFER_SIZE

#define LINE_BUFFER_SIZE   256

Line buffer size for /proc/stat parsing.

Function Documentation

_cpu_state_arrays_alloc()

bool _cpu_state_arrays_alloc ( cpugraph_state_t * state, const uint32_t cpu_usage_num )

static

Allocates state arrays for the given number of CPUs.

Parameters

state	CPU graph state.
cpu_usage_num	Number of CPUs.

Returns

true on success, false on allocation failure.

_state_free()

void _state_free ( void * app_state )

static

Frees all allocated state.

_stats_read_fn()

wlm_graph_read_result_t _stats_read_fn ( void * app_state, wlm_graph_values_t * values )

static

Reads CPU statistics from /proc/stat.

Uses the pre-opened file handle, counts CPUs, reallocates the buffer if needed, and fills it with per-CPU usage values.

Parameters

app_state	App state (cpugraph_state_t pointer).
values	Buffer to fill (may reallocate data/num).

Returns

WLM_GRAPH_READ_OK on success, WLM_GRAPH_READ_ERROR on error.

main()

int main	(	const int	argc,
		const char **	argv )

Main program.

Variable Documentation

_app_help

const char _app_help[]

static

Initial value:

                        =
"Displays CPU usage as a scrolling graph.\n"
"\n"
"The peak shows maximum CPU usage.\n"
"\n"
"Colors below indicate multi-core activity:\n"
"  - 1 core active (blue)\n"
"  - 1/4 cores active (cyan)\n"
"  - 1/2 cores active (green)\n"
"  - 3/4 cores active (yellow)\n"
"  - All cores active (red)"

Application help.

_app_name

const char _app_name[] = "wlmcpugraph"

static

Application name.