Added tmux-cpu-freq.c

tmux-cpu-freq.c

@@ -0,0 +1,130 @@
+/*
+ * tmux-cpu-freq.c - a little tmux "applet" for showing cpu frequencies
+ *
+ * by Lucas Martin-King
+ *
+ * [ Licenced under the GPLv2 ]
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+/* Set this to the number of CPU's your system */
+#define NUMBER_CPUS	6
+
+/* If your CPU can scale to more than 6 frequency levels,
+   then you should change this */
+#define MAX_CPU_LEVELS	6
+
+/* And you can add colours to this, if needed */
+#define MAX_LEVEL_COLORS 6
+static const char *level_colors[MAX_LEVEL_COLORS] = {
+	"red",
+	"yellow",
+	"green",
+	"blue",
+	"cyan",
+	"magenta",
+};
+
+#define CPU_FREQ		"/sys/devices/system/cpu/"
+#define FREQ_CUR_FORMAT		CPU_FREQ "cpu/cpu%d/cpufreq/scaling_cur_freq"
+#define FREQ_AVAILABLE_PATH	CPU_FREQ "cpu0/cpufreq/scaling_available_frequencies"
+
+static unsigned int cpu_freq(unsigned int cpu)
+{
+	#define PATH_LEN 64
+	char path[PATH_LEN];
+	FILE *f;
+	int ret = 0;
+	unsigned int freq = 0;
+
+	snprintf(path, PATH_LEN, FREQ_CUR_FORMAT, cpu);
+
+	f = fopen(path, "r");
+
+	if (f) {
+		ret = fscanf(f, "%u\n", &freq);
+		fclose(f);
+	}
+
+	if (ret == 1)
+		return freq;
+	else
+		return 0;
+}
+
+static unsigned int cpu_levels(unsigned int max_levels, unsigned int *levels)
+{
+	FILE *f;
+
+	unsigned int nr_levels = 0;
+	unsigned int freq = 0;
+
+	f = fopen(FREQ_AVAILABLE_PATH, "r");
+
+	if (f) {
+		while (fscanf(f, "%u ", &freq) == 1) {
+			if (nr_levels < max_levels) {
+				*levels = freq;
+
+				levels++;
+				nr_levels++;
+			} else {
+				break;
+			}
+
+			freq = 0;
+		}
+
+		fclose(f);
+	}
+
+	return nr_levels;
+}
+
+int main(int argc, char **argv)
+{
+	unsigned int cpu;
+	unsigned int freq;
+
+	unsigned int nr_cpus = NUMBER_CPUS;
+	unsigned int nr_levels;
+
+	unsigned int levels[MAX_CPU_LEVELS];
+	unsigned int level;
+
+	const char *colour = NULL;
+
+	if (argc > 1) {
+		int n = strtol(argv[1], (char **)NULL, 10); 
+
+		if (n > 0) {
+			nr_cpus = n;
+		}
+	}
+
+	nr_levels = cpu_levels(MAX_CPU_LEVELS, levels);
+
+	for (cpu = 0; cpu < nr_cpus; cpu++) {
+		freq = cpu_freq(cpu);	
+
+		for (level = 0; level < nr_levels; level++) {
+			if (levels[level] == freq) {
+				break;
+			}
+		}
+
+		if (level < MAX_LEVEL_COLORS) {
+			colour = level_colors[level];
+		}
+
+		printf("#[bg=%s]  ", colour);
+	}
+
+	printf("#[default]\n");
+	fflush(stdout);
+
+	return 0;
+}