init

.config/i3blocks/cpu_usage2/.gitignore

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+cpu_usage2

.config/i3blocks/cpu_usage2/Makefile

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+P=cpu_usage2
+OBJECTS=
+CFLAGS=-g -Wall -Werror -O2 -std=gnu11
+LDLIBS=
+
+$(P): $(OBJECTS)

.config/i3blocks/cpu_usage2/README.md

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+# cpu_usage2
+
+Show CPU usage.
+This is a C version of the cpu_usage blocklet.
+
+![](cpu_usage2.png)
+
+# Config
+
+```
+[cpu_usage2]
+command=$SCRIPT_DIR/cpu_usage2
+markup=pango
+interval=persist
+#min_width=CPU 100.00%
+#REFRESH_TIME=1
+#LABEL=CPU 
+#WARN_PERCENT=50
+#CRIT_PERCENT=80
+#DECIMALS=2
+```

.config/i3blocks/cpu_usage2/cpu_usage2.c

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+// Licensed under the terms of the GNU GPL v3, or any later version.
+//
+// Copyright 2019 Nolan Leake <nolan@sigbus.net>
+//
+// Loosely based on bandwidth2 (originally by Guillaume Coré <fridim@onfi.re>)
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <unistd.h>
+#include <getopt.h>
+
+#define RED "#FF7373"
+#define ORANGE "#FFA500"
+
+typedef unsigned long long int ulli;
+
+void usage(char *argv[])
+{
+  printf("Usage: %s "
+         "[-t seconds] [-w %%age] [-c %%age] [-d decimals] [-l label] [-h]\n",
+         argv[0]);
+  printf("\n");
+  printf("-t seconds\trefresh time (default is 1)\n");
+  printf("-w %%\tSet warning (color orange) for cpu usage. (default: none)\n");
+  printf("-c %%\tSet critical (color red) for cpu usage. (default: none)\n");
+  printf("-d number\tNumber of decimal places for percentage (default: 2)\n");
+  printf("-l label\tLabel to print before the cpu usage (default: CPU)\n");
+  printf("-h \t\tthis help\n");
+  printf("\n");
+}
+
+void display(const char *label, double used,
+             int const warning, int const critical, int const decimals)
+{
+  if (critical != 0 && used > critical) {
+    printf("%s<span color='%s'>", label, RED);
+  } else if (warning != 0 && used > warning) {
+    printf("%s<span color='%s'>", label, ORANGE);
+  } else {
+    printf("%s<span>", label);
+  }
+
+  printf("%*.*lf%%</span>\n", decimals + 3 + 1, decimals, used);
+}
+
+ulli get_usage(ulli *used_jiffies)
+{
+  FILE *fd = fopen("/proc/stat", "r");
+  ulli user, nice, sys, idle, iowait, irq, sirq, steal, guest, nguest;
+
+  if (!fd) {
+    perror("Couldn't open /proc/stat\n");
+    exit(EXIT_FAILURE);
+  }
+  if (fscanf(fd, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu",
+             &user, &nice, &sys, &idle, &iowait, &irq, &sirq,
+             &steal, &guest, &nguest) != 10) {
+    perror("Couldn't read jiffies from /proc/stat\n");
+    exit(EXIT_FAILURE);
+  }
+  fclose(fd);
+
+  *used_jiffies = user + nice + sys + irq + sirq + steal + guest + nguest;
+  return *used_jiffies + idle + iowait;
+}
+
+int main(int argc, char *argv[])
+{
+  int warning = 50, critical = 80, t = 1, decimals = 2;
+  char *label = "CPU ";
+  int c;
+  char *envvar = NULL;
+
+  envvar = getenv("REFRESH_TIME");
+  if (envvar)
+    t = atoi(envvar);
+  envvar = getenv("WARN_PERCENT");
+  if (envvar)
+    warning = atoi(envvar);
+  envvar = getenv("CRIT_PERCENT");
+  if (envvar)
+    critical = atoi(envvar);
+  envvar = getenv("DECIMALS");
+  if (envvar)
+    decimals = atoi(envvar);
+  envvar = getenv("LABEL");
+  if (envvar)
+    label = envvar;
+
+  while (c = getopt(argc, argv, "ht:w:c:d:l:"), c != -1) {
+    switch (c) {
+    case 't':
+      t = atoi(optarg);
+      break;
+    case 'w':
+      warning = atoi(optarg);
+      break;
+    case 'c':
+      critical = atoi(optarg);
+      break;
+    case 'd':
+      decimals = atoi(optarg);
+      break;
+    case 'l':
+      label = optarg;
+      break;
+    case 'h':
+      usage(argv);
+      return EXIT_SUCCESS;
+    }
+  }
+
+  ulli old_total;
+  ulli old_used;
+
+  old_total = get_usage(&old_used);
+
+  while (1) {
+    ulli used;
+    ulli total;
+
+    sleep(t);
+    total = get_usage(&used);
+
+    display(label, 100.0D * (used - old_used) / (total - old_total),
+            warning, critical, decimals);
+    fflush(stdout);
+    old_total = total;
+    old_used = used;
+  }
+
+  return EXIT_SUCCESS;
+}

.config/i3blocks/cpu_usage2/i3blocks.conf

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+[cpu_usage2]
+command=$SCRIPT_DIR/cpu_usage2
+markup=pango
+interval=persist
+#min_width=CPU 100.00%
+#REFRESH_TIME=1
+#LABEL=CPU 
+#WARN_PERCENT=50
+#CRIT_PERCENT=80
+#DECIMALS=2