1 files changed, 88 insertions, 0 deletions
diff --git a/components/cpu.c b/components/cpu.c
new file mode 100644
index 0000000..11e2e98
--- /dev/null
+++ b/components/cpu.c
@@ -0,0 +1,88 @@
+/* See LICENSE file for copyright and license details. */
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#if defined(__OpenBSD__)
+#include <sys/sysctl.h>
+#endif
+
+#include "../util.h"
+
+#if defined(__linux__)
+const char *
+cpu_freq(void)
+{
+	int freq;
+
+	return (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq",
+	               "%i", &freq) == 1) ?
+	       bprintf("%d", (freq + 500) / 1000) : NULL;
+}
+
+const char *
+cpu_perc(void)
+{
+	int perc;
+	static long double a[7];
+	static int valid;
+	long double b[7];
+
+	memcpy(b, a, sizeof(b));
+	if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
+	           &a[3], &a[4], &a[5], &a[6]) != 7) {
+		return NULL;
+	}
+	if (!valid) {
+		valid = 1;
+		return NULL;
+	}
+
+	perc = 100 * ((b[0]+b[1]+b[2]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[5]+a[6])) /
+	       ((b[0]+b[1]+b[2]+b[3]+b[4]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[3]+a[4]+a[5]+a[6]));
+
+	return bprintf("%d", perc);
+}
+
+const char *
+cpu_iowait(void)
+{
+	int perc;
+	static int valid;
+	static long double a[7];
+	long double b[7];
+
+	memcpy(b, a, sizeof(b));
+	if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
+	           &a[3], &a[4], &a[5], &a[6]) != 7) {
+		return NULL;
+	}
+	if (!valid) {
+		valid = 1;
+		return NULL;
+	}
+
+	perc = 100 * ((b[4]) - (a[4])) /
+	       ((b[0]+b[1]+b[2]+b[3]+b[4]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[3]+a[4]+a[5]+a[6]));
+
+	return bprintf("%d", perc);
+}
+#elif defined(__OpenBSD__)
+const char *
+cpu_freq(void)
+{
+	int freq, mib[2];
+	size_t size;
+
+	mib[0] = CTL_HW;
+	mib[1] = HW_CPUSPEED;
+
+	size = sizeof(freq);
+
+	if (sysctl(mib, 2, &freq, &size, NULL, 0) == -1) {
+		fprintf(stderr, "sysctl 'HW_CPUSPEED': %s\n", strerror(errno));
+		return NULL;
+	}
+
+	return bprintf("%d", freq);
+}
+#endif