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/*
* Copyright 2014 The Chromium Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <ctype.h>
#include <dirent.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
/*
* This tool is essentially an extended version of ps with JSON output.
* Its output is meant consumed by scripts / tools for gathering OS/ps stats.
* Output units:
* All times are expressed in ticks.
* All memory counters are expressed in Kb.
*/
static void dump_time(void) {
float uptime_secs = 0.0F;
const long rate = sysconf(_SC_CLK_TCK);
FILE *f = fopen("/proc/uptime", "r");
if (!f)
return;
fscanf(f, "%f", &uptime_secs);
fclose(f);
const long ticks = (long) (rate * uptime_secs);
printf(" \"time\": { \"ticks\": %ld, \"rate\": %ld}", ticks, rate);
}
static void dump_cpu_stats(void) {
FILE *f = fopen("/proc/stat", "r");
if (!f)
return;
printf(" \"cpu\":\n [\n");
bool terminate_prev_line = false;
while (!feof(f)) {
char line[256];
char cpu[8];
long unsigned t_usr = 0;
long unsigned t_nice = 0;
long unsigned t_sys = 0;
long unsigned t_idle = 0;
fgets(line, sizeof(line), f);
/* Skip the total 'cpu ' line and the other irrelevant ones. */
if (strncmp(line, "cpu", 3) != 0 || line[3] == ' ')
continue;
if (sscanf(line, "%s %lu %lu %lu %lu",
cpu, &t_usr, &t_nice, &t_sys, &t_idle) != 5) {
continue;
}
if (terminate_prev_line)
printf(",\n");
terminate_prev_line = true;
printf(" {\"usr\": %lu, \"sys\": %lu, \"idle\": %lu}",
t_usr + t_nice, t_sys, t_idle);
}
fclose(f);
printf("\n ]");
}
static void dump_mem_stats(void) {
FILE *f = fopen("/proc/meminfo", "r");
if (!f)
return;
printf(" \"mem\":\n {\n");
bool terminate_prev_line = false;
while (!feof(f)) {
char line[256];
char key[32];
long value = 0;
fgets(line, sizeof(line), f);
if (sscanf(line, "%s %lu %*s", key, &value) < 2)
continue;
if (terminate_prev_line)
printf(",\n");
terminate_prev_line = true;
printf(" \"%s\": %lu", key, value);
}
fclose(f);
printf("\n }");
}
static void dump_proc_stats(void) {
struct dirent *de;
DIR *d = opendir("/proc");
if (!d)
return;
const long kb_per_page = sysconf(_SC_PAGESIZE) / 1024;
bool terminate_prev_line = false;
printf(" \"processes\":\n {\n");
while ((de = readdir(d))) {
if (!isdigit(de->d_name[0]))
continue;
const int pid = atoi(de->d_name);
/* Don't print out ourselves (how civilized). */
if (pid == getpid())
continue;
char cmdline[64];
char fpath[32];
FILE *f;
/* Read full process path / package from cmdline. */
sprintf(fpath, "/proc/%d/cmdline", pid);
f = fopen(fpath, "r");
if (!f)
continue;
cmdline[0] = '\0';
fgets(cmdline, sizeof(cmdline), f);
fclose(f);
/* Read cpu/io/mem stats. */
char proc_name[256];
long num_threads = 0;
long unsigned min_faults = 0;
long unsigned maj_faults = 0;
long unsigned utime = 0;
long unsigned ktime = 0;
long unsigned vm_rss = 0;
long long unsigned start_time = 0;
sprintf(fpath, "/proc/%d/stat", pid);
f = fopen(fpath, "r");
if (!f)
continue;
fscanf(f, "%*d %s %*c %*d %*d %*d %*d %*d %*u %lu %*u %lu %*u %lu %lu "
"%*d %*d %*d %*d %ld %*d %llu %*u %ld", proc_name, &min_faults,
&maj_faults, &utime, &ktime, &num_threads, &start_time, &vm_rss);
fclose(f);
/* Prefer the cmdline when available, since it contains the package name. */
char const * const cmd = (strlen(cmdline) > 0) ? cmdline : proc_name;
if (terminate_prev_line)
printf(",\n");
terminate_prev_line = true;
printf(" \"%d\": {"
"\"name\": \"%s\", "
"\"n_threads\": %ld, "
"\"start_time\": %llu, "
"\"user_time\": %lu, "
"\"sys_time\": %lu, "
"\"min_faults\": %lu, "
"\"maj_faults\": %lu, "
"\"vm_rss\": %lu"
"}",
pid,
cmd,
num_threads,
start_time,
utime,
ktime,
min_faults,
maj_faults,
vm_rss * kb_per_page);
}
closedir(d);
printf("\n }");
}
int main()
{
printf("{\n");
dump_time();
printf(",\n");
dump_mem_stats();
printf(",\n");
dump_cpu_stats();
printf(",\n");
dump_proc_stats();
printf("\n}\n");
return 0;
}
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