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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <time.h>
#include <stdbool.h>
#include <unistd.h>
#include <stdlib.h>
#include <ctype.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
const char *wlan_interface = "wlan0";
const char *eth_interface = "eth0";
// TODO: run-watches, z.B.
// "/var/run/dhcp*.pid" --> checkt ob's das file gibt, ob der prozess läuft und zeigt dann yes/no an
// "/var/run/vpnc*.pid"
char output[512];
bool first_push = true;
static char *skip_character(char *input, char character, int amount) {
char *walk;
int len = strlen(input),
blanks = 0;
for (walk = input; ((walk - input) < len) && (blanks < amount); walk++)
if (*walk == character)
blanks++;
return (walk == input ? walk : walk-1);
}
static void push_part(const char *input, const int n) {
if (first_push)
first_push = false;
else
strncpy(output+strlen(output), " | ", strlen(" | "));
strncpy(output+strlen(output), input, n);
}
/*
* Get battery information from /sys. Note that it uses the design capacity to calculate the percentage,
* not the full capacity.
*
*/
static char *get_battery_info() {
char buf[1024];
static char output[512];
char *walk, *last = buf;
int fd = open("/sys/class/power_supply/BAT0/uevent", O_RDONLY);
int full_design = -1,
remaining = -1,
present_rate = -1;
bool charging = false;
memset(output, '\0', sizeof(output));
read(fd, buf, sizeof(buf));
for (walk = buf; (walk-buf) < 1024; walk++)
if (*walk == '=') {
if (strncmp(last, "POWER_SUPPLY_ENERGY_FULL_DESIGN", strlen("POWER_SUPPLY_ENERGY_FULL_DESIGN")) == 0)
full_design = atoi(walk+1);
else if (strncmp(last, "POWER_SUPPLY_ENERGY_NOW", strlen("POWER_SUPPLY_ENERGY_NOW")) == 0)
remaining = atoi(walk+1);
else if (strncmp(last, "POWER_SUPPLY_CURRENT_NOW", strlen("POWER_SUPPLY_CURRENT_NOW")) == 0)
present_rate = atoi(walk+1);
else if (strncmp(last, "POWER_SUPPLY_STATUS=Charging", strlen("POWER_SUPPLY_STATUS=Charging")) == 0)
charging = true;
} else if (*walk == '\n')
last = walk+1;
close(fd);
if ((full_design != -1) && (remaining != -1) && (present_rate != -1)) {
float time, perc;
if (charging)
time = ((float)full_design - (float)remaining) / (float)present_rate;
else time = ((float)remaining / (float)present_rate);
perc = ((float)remaining / (float)full_design);
int seconds = (int)(time * 3600.0);
int hours = seconds / 3600;
seconds -= (hours * 3600);
int minutes = seconds / 60;
seconds -= (minutes * 60);
sprintf(output, "%s %.02f%% %02d:%02d:%02d", (charging ? "CHR" : "BAT"), (perc * 100), hours, minutes, seconds);
}
return output;
}
/*
* Just parses /proc/net/wireless
*
*/
static char *get_wireless_info() {
char buf[1024];
static char output[512];
char *interfaces;
memset(buf, '\0', sizeof(buf));
memset(output, '\0', sizeof(output));
int fd = open("/proc/net/wireless", O_RDONLY);
read(fd, buf, sizeof(buf));
close(fd);
interfaces = skip_character(buf, '\n', 2) + 1;
while (interfaces < buf+strlen(buf)) {
while (isspace((int)*interfaces))
interfaces++;
if (strncmp(interfaces, wlan_interface, strlen(wlan_interface)) == 0) {
/* Skip status field (0000) */
interfaces += strlen(wlan_interface) + 2;
interfaces = skip_character(interfaces, ' ', 1);
while (isspace((int)*interfaces))
interfaces++;
int quality = atoi(interfaces);
/* For some reason, I get 255 sometimes */
if (quality == 255)
quality = 0;
snprintf(output, sizeof(output), "W: (%02d%%) ", quality);
return output;
}
interfaces = skip_character(interfaces, '\n', 1) + 1;
}
return output;
}
static char *get_eth_info() {
static char output[512];
struct ifreq ifr;
memset(output, '\0', sizeof(output));
int fd = socket(AF_INET, SOCK_DGRAM, 0);
strcpy(ifr.ifr_name, eth_interface);
if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
printf("böses fehler\n");
/* TODO: errorhandling */
}
if (!(ifr.ifr_flags & IFF_UP) ||
!(ifr.ifr_flags & IFF_RUNNING)) {
sprintf(output, "E: down");
close(fd);
return output;
}
strcpy(ifr.ifr_name, eth_interface);
ifr.ifr_addr.sa_family = AF_INET;
if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
struct sockaddr_in addr;
memcpy(&addr, &ifr.ifr_addr, sizeof(struct sockaddr_in));
inet_ntop(AF_INET, &addr.sin_addr.s_addr, output+3, sizeof(struct sockaddr_in));
strncpy(output, "E: ", strlen("E: "));
if (strlen(output) == 0)
sprintf(output, "E: no IP");
}
close(fd);
return output;
}
int main() {
char part[512],
*end;
while (1) {
memset(output, '\0', sizeof(output));
first_push = true;
char *wireless_info = get_wireless_info();
push_part(wireless_info, strlen(wireless_info));
char *eth_info = get_eth_info();
push_part(eth_info, strlen(eth_info));
char *battery_info = get_battery_info();
push_part(battery_info, strlen(battery_info));
/* Get load */
int load_avg = open("/proc/loadavg", O_RDONLY);
read(load_avg, part, sizeof(part));
close(load_avg);
end = skip_character(part, ' ', 3);
push_part(part, (end-part));
/* Get date & time */
time_t current_time = time(NULL);
struct tm *current_tm = localtime(¤t_time);
strftime(part, sizeof(part), "%d.%m.%Y %H:%M:%S", current_tm);
push_part(part, strlen(part));
printf("output = %s\n", output);
int fd = open("/mnt/wmii/rbar/status", O_RDWR);
write(fd, output, strlen(output));
close(fd);
sleep(1);
}
}
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