+++ /dev/null
-#include <errno.h>
-#include <fcntl.h>
-#include <math.h>
-#include <inttypes.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/time.h>
-#include <time.h>
-#include <unistd.h>
-
-
-void sleep_nanos(long nanos) {
- struct timespec rqtp;
- rqtp.tv_sec = 0;
- rqtp.tv_nsec = nanos;
- nanosleep(&rqtp, NULL);
-}
-
-long get_time_nanos() {
- struct timeval t;
- gettimeofday(&t, NULL);
- return t.tv_sec * 1000000000L + t.tv_usec * 1000;
-}
-
-char* read_file(char* filename) {
- static char buf[32768];
-
- size_t pos = 0;
- int fd = open(filename, 0);
-
- if (fd < 0) {
- return NULL;
- }
-
- for (;;) {
- ssize_t result = read(fd, buf+pos, sizeof(buf)-pos);
- if (result < 0) {
- return NULL;
- }
- if (result == 0) {
- return buf;
- }
- pos += result;
- if (pos >= sizeof(buf)) {
- fprintf(stderr, "Failed reading file, too much data: %s\n", filename);
- return buf;
- }
- }
-}
-
-long parse_int(char* s) {
- if (s == NULL) {
- return -1;
- }
-
- errno = 0;
- long value = strtol(s, NULL, 10);
- if (errno != 0) {
- fprintf(stderr, "Failed to parse string: %s -- %s\n", strerror(errno), s);
- return -1;
- }
-
- return value;
-}
-
-char* read_next_line(char** s) {
- char* end = index(*s, '\n');
- if (end == NULL) {
- return NULL;
- }
-
- char* line = *s;
- *s = end+1;
- *end = '\0';
- return line;
-}
-
-int read_cpu_idle_jiffys() {
- char* procstat = read_file("/proc/stat");
- if (procstat == NULL) {
- fprintf(stderr, "Failed reading file /proc/stat: %s\n", strerror(errno));
- return -1;
- }
-
- char* line = read_next_line(&procstat);
- if (line == NULL) {
- return -1;
- }
-
- char* result = NULL;
- for (int i = 0; i <= 4; ++i, line=NULL) {
- result = strtok(line, " ");
- }
- return parse_int(result);
-}
-
-int count_cpus() {
- char* procstat = read_file("/proc/stat");
- if (procstat == NULL) {
- fprintf(stderr, "Failed reading file /proc/stat: %s\n", strerror(errno));
- return -1;
- }
-
- int count = -1;
- while (*procstat) {
- char* line = read_next_line(&procstat);
- if (line == NULL) {
- break;
- }
- if (strncmp("cpu", line, 3) == 0) {
- ++count;
- }
- }
- return count;
-}
-
-int read_cpu_percent() {
- int num_cpus = count_cpus();
-
- long tstart = get_time_nanos();
- int idle_jiffy1 = read_cpu_idle_jiffys();
- sleep_nanos(100000000L);
- int idle_jiffy2 = read_cpu_idle_jiffys();
- long tend = get_time_nanos();
-
- double duration_sec = ((double)tend - (double)tstart) / 1000000000.0;
- double idle_jiffys_per_second = (idle_jiffy2 - idle_jiffy1) / duration_sec;
-
- double idle_jiffys_per_cpu_second = idle_jiffys_per_second / num_cpus;
-
- // One jiffy is 10ms, so we can get the percentage very easily!
- return 100 - (int)round(idle_jiffys_per_cpu_second);
-}
-
-int read_meminfo(int* mem_free_mibis, int* mem_total_mibis) {
- char* meminfo = read_file("/proc/meminfo");
- if (meminfo == NULL) {
- fprintf(stderr, "Failed reading file /proc/meminfo: %s\n", strerror(errno));
- return -1;
- }
-
- *mem_free_mibis = -1;
- *mem_total_mibis = -1;
-
- while (*meminfo) {
- char* line = read_next_line(&meminfo);
- if (line == NULL) {
- break;
- }
-
- char* key = strtok(line, ": ");
- char* value_str = strtok(NULL, ": ");
-
- if (key == NULL || value_str == NULL) {
- fprintf(stderr, "Failed to parse key/value token in /proc/meminfo\n");
- return -1;
- }
-
- if (strcmp(key, "MemAvailable") == 0) {
- int mem_available = parse_int(value_str);
- *mem_free_mibis = (int)round((double)mem_available / 1024);
- }
-
- if (strcmp(key, "MemTotal") == 0) {
- int mem_available = parse_int(value_str);
- *mem_total_mibis = (int)round((double)mem_available / 1024);
- }
- }
-
- if (*mem_free_mibis < 0 || *mem_total_mibis < 0) {
- fprintf(stderr, "Failed to find field in /proc/meminfo\n");
- return -1;
- } else {
- return 0;
- }
-}
-
-int read_zfs_arc_used_mibis() {
- char* arcstats = read_file("/proc/spl/kstat/zfs/arcstats");
- if (arcstats == NULL) {
- return -1;
- }
-
- while (*arcstats) {
- char* line = read_next_line(&arcstats);
- if (line == NULL) {
- break;
- }
-
- char* key = strtok(line, " ");
- strtok(NULL, " ");
- char* value_str = strtok(NULL, " ");
-
- if (key == NULL || value_str == NULL) {
- fprintf(stderr, "Failed to parse key/value token in /proc/spl/kstat/zfs/arcstats\n");
- return -1;
- }
-
- if (strcmp(key, "size") == 0) {
- long arc_used = parse_int(value_str);
- return (int)round((double)arc_used / 1024 / 1024);
- }
- }
-
- fprintf(stderr, "Failed to find 'c' in /proc/spl/kstat/zfs/arcstats\n");
- return -1;
-}
-
-int read_battery_percent() {
- char* percent_str = NULL;
-
- if (percent_str == NULL) {
- percent_str = read_file("/sys/class/power_supply/BAT0/capacity");
- }
-
- if (percent_str == NULL) {
- percent_str = read_file("/sys/class/power_supply/BAT1/capacity");
- }
-
- if (percent_str == NULL) {
- fprintf(stderr, "Failed reading file battery capacity file: %s\n", strerror(errno));
- return -1;
- }
-
- return parse_int(percent_str);
-}
-
-void print_red_threshold(
- char* name, char* units,
- int value,
- int red_low, int red_high
-) {
- if (value < 0) {
- return;
- }
-
- char* color = "black";
- if (value >= red_low && value <= red_high) {
- color = "red";
- }
-
- printf(
- "%s <span color='%s'>%d</span>%s\n",
- name, color, value, units
- );
-}
-
-int main(int argc, char** argv) {
- char* show_flags = "cmb";
- char* top_padding = "0";
- if (argc >= 2) {
- show_flags = argv[1];
- }
- if (argc >= 3) {
- top_padding = argv[2];
- }
-
- printf("<txt><span size=\"%s\">\n</span>", top_padding);
-
- if (strchr(show_flags, 'c')) {
- print_red_threshold(
- "cpu", "%",
- read_cpu_percent(),
- 50, 100
- );
- }
-
- if (strchr(show_flags, 'm')) {
- int mem_free_mibis, mem_total_mibis;
- read_meminfo(&mem_free_mibis, &mem_total_mibis);
- print_red_threshold(
- "mem", " MiB",
- mem_free_mibis + read_zfs_arc_used_mibis(),
- 0, mem_total_mibis / 10
- );
- }
-
- if (strchr(show_flags, 'b')) {
- print_red_threshold(
- "batt", "%",
- read_battery_percent(),
- 0, 25
- );
- }
-
- printf("</txt>");
-
- return 0;
-}