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#include "cpu.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <inttypes.h>
#include <tgmath.h>
#define VALUE_SIZE 32
#define FILE_STAT_PATH "/proc/stat"
struct cpu_stat {
unsigned long usage;
unsigned long total;
};
struct cpu {
char value[VALUE_SIZE];
struct cpu_stat last;
FILE * statfd;
};
static void
parse_cpu_stat(struct cpu * c, struct cpu_stat * stat)
{
char line[1024];
char * tok = line + 5;
stat->usage = 0;
stat->total = 0;
rewind(c->statfd);
fflush(c->statfd);
fgets(line, 1024, c->statfd);
stat->usage += strtoul(tok, &tok, 10);
stat->usage += strtoul(tok, &tok, 10);
stat->usage += strtoul(tok, &tok, 10);
stat->total += stat->usage + strtoul(tok, &tok, 10);
}
struct cpu *
cpu_new()
{
struct cpu * c = malloc(sizeof(struct cpu));
memset(c->value, '\0', VALUE_SIZE);
c->statfd = fopen(FILE_STAT_PATH, "r");
parse_cpu_stat(c, &c->last);
return c;
}
void
cpu_free(struct cpu * c)
{
fclose(c->statfd);
free(c);
}
void
cpu_update(struct cpu * c)
{
struct cpu_stat stat;
unsigned long usage_diff, total_diff;
unsigned short percent;
parse_cpu_stat(c, &stat);
usage_diff = stat.usage - c->last.usage;
total_diff = stat.total - c->last.total;
c->last = stat;
percent = round((100.0f / total_diff) * usage_diff);
snprintf(c->value, VALUE_SIZE, "\uf2db% 4d%%", percent);
}
const char *
cpu_get_val(struct cpu * c)
{
return c->value;
}
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