git.sur5r.net Git - i3/i3status/blob - wmiistatus.c

   1 /*
   2  * Generates a status line for use with wmii or other minimal window managers
   3  *
   4  *
   5  * Copyright (c) 2008 Michael Stapelberg and contributors
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without modification,
   9  * are permitted provided that the following conditions are met:
  10  *
  11  * * Redistributions of source code must retain the above copyright notice, this
  12  *   list of conditions and the following disclaimer.
  13  *
  14  * * Redistributions in binary form must reproduce the above copyright notice, this
  15  *   list of conditions and the following disclaimer in the documentation and/or other
  16  *   materials provided with the distribution.
  17  *
  18  * * Neither the name of Michael Stapelberg nor the names of contributors
  19  *   may be used to endorse or promote products derived from this software without
  20  *   specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  23  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  25  * SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  27  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  28  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  30  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  31  * DAMAGE.
  32  *
  33  */
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36 #include <fcntl.h>
  37 #include <string.h>
  38 #include <stdio.h>
  39 #include <time.h>
  40 #include <stdbool.h>
  41 #include <stdarg.h>
  42 #include <unistd.h>
  43 #include <stdlib.h>
  44 #include <ctype.h>
  45 #include <net/if.h>
  46 #include <sys/ioctl.h>
  47 #include <sys/socket.h>
  48 #include <netinet/in.h>
  49 #include <arpa/inet.h>
  50 #include <glob.h>
  51 #include <dirent.h>
  52
  53 #include "wmiistatus.h"
  54 #include "config.h"
  55
  56 static void cleanup_rbar_dir() {
  57         struct dirent *ent;
  58         DIR *dir;
  59         char pathbuf[strlen(wmii_path)+256+1];
  60
  61         if ((dir = opendir(wmii_path)) == NULL)
  62                 exit(-3);
  63
  64         while ((ent = readdir(dir)) != NULL) {
  65                 if (ent->d_type == DT_REG) {
  66                         sprintf(pathbuf, "%s%s", wmii_path, ent->d_name);
  67                         unlink(pathbuf);
  68                 }
  69         }
  70
  71         closedir(dir);
  72 }
  73
  74 static void create_file(const char *name) {
  75         char pathbuf[strlen(wmii_path)+256+1];
  76
  77         sprintf(pathbuf, "%s%s", wmii_path, name);
  78         int fd = creat(pathbuf, S_IRUSR | S_IWUSR);
  79         if (fd < 0)
  80                 exit(-4);
  81         close(fd);
  82 }
  83
  84 static void write_to_statusbar(const char *name, const char *message) {
  85         char pathbuf[strlen(wmii_path)+256+1];
  86
  87         sprintf(pathbuf, "%s%s", wmii_path, name);
  88         int fd = open(pathbuf, O_RDWR);
  89         if (fd == -1)
  90                 exit(-2);
  91         write(fd, message, strlen(message));
  92         close(fd);
  93 }
  94
  95 static void write_error_to_statusbar(const char *message) {
  96         cleanup_rbar_dir();
  97         write_to_statusbar("error", message);
  98 }
  99
 100 /*
 101  * Write errormessage to statusbar and exit
 102  *
 103  */
 104 static void die(const char *fmt, ...) {
 105         char buffer[512];
 106         va_list ap;
 107         va_start(ap, fmt);
 108         vsprintf(buffer, fmt, ap);
 109         va_end(ap);
 110
 111         write_error_to_statusbar(buffer);
 112         exit(-1);
 113 }
 114
 115 static char *skip_character(char *input, char character, int amount) {
 116         char *walk;
 117         int len = strlen(input),
 118             blanks = 0;
 119
 120         for (walk = input; ((walk - input) < len) && (blanks < amount); walk++)
 121                 if (*walk == character)
 122                         blanks++;
 123
 124         return (walk == input ? walk : walk-1);
 125 }
 126
 127 /*
 128  * Get battery information from /sys. Note that it uses the design capacity to calculate the percentage,
 129  * not the full capacity.
 130  *
 131  */
 132 static char *get_battery_info() {
 133         char buf[1024];
 134         static char part[512];
 135         char *walk, *last = buf;
 136         int fd = open(battery, O_RDONLY);
 137         if (fd == -1)
 138                 die("Could not open %s", battery);
 139         int full_design = -1,
 140             remaining = -1,
 141             present_rate = -1;
 142         charging_status_t status = CS_DISCHARGING;
 143         memset(part, '\0', sizeof(part));
 144         read(fd, buf, sizeof(buf));
 145         for (walk = buf; (walk-buf) < 1024; walk++)
 146                 if (*walk == '=') {
 147                         if (BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_FULL_DESIGN"))
 148                                 full_design = atoi(walk+1);
 149                         else if (BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_NOW"))
 150                                 remaining = atoi(walk+1);
 151                         else if (BEGINS_WITH(last, "POWER_SUPPLY_CURRENT_NOW"))
 152                                 present_rate = atoi(walk+1);
 153                         else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Charging"))
 154                                 status = CS_CHARGING;
 155                         else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Full"))
 156                                 status = CS_FULL;
 157                 } else if (*walk == '\n')
 158                         last = walk+1;
 159         close(fd);
 160
 161         if ((full_design != -1) && (remaining != -1) && (present_rate != -1)) {
 162                 float remaining_time, perc;
 163                 if (status == CS_CHARGING)
 164                         remaining_time = ((float)full_design - (float)remaining) / (float)present_rate;
 165                 else if (status == CS_DISCHARGING)
 166                         remaining_time = ((float)remaining / (float)present_rate);
 167                 else {
 168                         snprintf(part, sizeof(part), "FULL");
 169                         return part;
 170                 }
 171                 perc = ((float)remaining / (float)full_design);
 172
 173                 int seconds = (int)(remaining_time * 3600.0);
 174                 int hours = seconds / 3600;
 175                 seconds -= (hours * 3600);
 176                 int minutes = seconds / 60;
 177                 seconds -= (minutes * 60);
 178
 179                 sprintf(part, "%s %.02f%% %02d:%02d:%02d", (status == CS_CHARGING? "CHR" : "BAT"),
 180                         (perc * 100), hours, minutes, seconds);
 181         }
 182         return part;
 183 }
 184
 185 /*
 186  * Just parses /proc/net/wireless
 187  *
 188  */
 189 static char *get_wireless_info() {
 190         char buf[1024];
 191         static char part[512];
 192         char *interfaces;
 193         memset(buf, '\0', sizeof(buf));
 194         memset(part, '\0', sizeof(part));
 195
 196         int fd = open("/proc/net/wireless", O_RDONLY);
 197         if (fd == -1)
 198                 die("Could not open /proc/net/wireless");
 199         read(fd, buf, sizeof(buf));
 200         close(fd);
 201
 202         interfaces = skip_character(buf, '\n', 2) + 1;
 203         while (interfaces < buf+strlen(buf)) {
 204                 while (isspace((int)*interfaces))
 205                         interfaces++;
 206                 if (strncmp(interfaces, wlan_interface, strlen(wlan_interface)) == 0) {
 207                         /* Skip status field (0000) */
 208                         interfaces += strlen(wlan_interface) + 2;
 209                         interfaces = skip_character(interfaces, ' ', 1);
 210                         while (isspace((int)*interfaces))
 211                                 interfaces++;
 212                         int quality = atoi(interfaces);
 213                         /* For some reason, I get 255 sometimes */
 214                         if ((quality == 255) || (quality == 0))
 215                                 snprintf(part, sizeof(part), "W: down");
 216                         else {
 217                                 snprintf(part, sizeof(part), "W: (%02d%%) ", quality);
 218                                 char *ip_address = get_ip_address(wlan_interface);
 219                                 strcpy(part+strlen(part), ip_address);
 220                         }
 221
 222                         return part;
 223                 }
 224                 interfaces = skip_character(interfaces, '\n', 1) + 1;
 225         }
 226
 227         return part;
 228 }
 229
 230 static char *get_ip_address(const char *interface) {
 231         static char part[512];
 232         struct ifreq ifr;
 233         memset(part, '\0', sizeof(part));
 234
 235         int fd = socket(AF_INET, SOCK_DGRAM, 0);
 236
 237         strcpy(ifr.ifr_name, interface);
 238         if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0)
 239                 die("Could not get interface flags (SIOCGIFFLAGS)");
 240
 241         if (!(ifr.ifr_flags & IFF_UP) ||
 242             !(ifr.ifr_flags & IFF_RUNNING)) {
 243                 close(fd);
 244                 return NULL;
 245         }
 246
 247         strcpy(ifr.ifr_name, interface);
 248         ifr.ifr_addr.sa_family = AF_INET;
 249         if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
 250                 struct sockaddr_in addr;
 251                 memcpy(&addr, &ifr.ifr_addr, sizeof(struct sockaddr_in));
 252                 inet_ntop(AF_INET, &addr.sin_addr.s_addr, part, sizeof(struct sockaddr_in));
 253                 if (strlen(part) == 0)
 254                         sprintf(part, "no IP");
 255         }
 256
 257         close(fd);
 258         return part;
 259 }
 260
 261 static char *get_eth_info() {
 262         static char part[512];
 263         char *ip_address = get_ip_address(eth_interface);
 264
 265         if (ip_address == NULL)
 266                 snprintf(part, sizeof(part), "E: down");
 267         else snprintf(part, sizeof(part), "E: %s", ip_address);
 268
 269         return part;
 270 }
 271
 272 /*
 273  * Checks if the PID in path is still valid by checking if /proc/<pid> exists
 274  *
 275  */
 276 static bool process_runs(const char *path) {
 277         char pidbuf[512],
 278              procbuf[512],
 279              *walk;
 280         int n;
 281         static glob_t globbuf;
 282         struct stat statbuf;
 283
 284         if (glob(path, GLOB_NOCHECK | GLOB_TILDE, NULL, &globbuf) < 0)
 285                 die("glob() failed");
 286         const char *real_path = (globbuf.gl_pathc > 0 ? globbuf.gl_pathv[0] : path);
 287         int fd = open(real_path, O_RDONLY);
 288         globfree(&globbuf);
 289         if (fd < 0)
 290                 return false;
 291         n = read(fd, pidbuf, sizeof(pidbuf));
 292         if (n > 0)
 293                 pidbuf[n] = '\0';
 294         close(fd);
 295         for (walk = pidbuf; *walk != '\0'; walk++)
 296                 if (!isdigit((int)(*walk))) {
 297                         *walk = '\0';
 298                         break;
 299                 }
 300         sprintf(procbuf, "/proc/%s", pidbuf);
 301         return (stat(procbuf, &statbuf) >= 0);
 302 }
 303
 304 int main(void) {
 305         char part[512],
 306              pathbuf[512],
 307              *end;
 308         unsigned int i;
 309
 310         cleanup_rbar_dir();
 311         create_file(ORDER_WLAN "wlan");
 312         create_file(ORDER_ETH "eth");
 313         create_file(ORDER_BATTERY "battery");
 314         create_file(ORDER_LOAD "load");
 315         create_file(ORDER_TIME "time");
 316         for (i = 0; i < sizeof(run_watches) / sizeof(char*); i += 2) {
 317                 sprintf(pathbuf, "%s%s", ORDER_RUN, run_watches[i]);
 318                 create_file(pathbuf);
 319         }
 320
 321         while (1) {
 322                 for (i = 0; i < sizeof(run_watches) / sizeof(char*); i += 2) {
 323                         sprintf(part, "%s: %s", run_watches[i], (process_runs(run_watches[i+1]) ? "yes" : "no"));
 324                         sprintf(pathbuf, "%s%s", ORDER_RUN, run_watches[i]);
 325                         write_to_statusbar(pathbuf, part);
 326                 }
 327
 328                 write_to_statusbar(ORDER_WLAN "wlan", get_wireless_info());
 329                 write_to_statusbar(ORDER_ETH "eth", get_eth_info());
 330                 write_to_statusbar(ORDER_BATTERY "battery", get_battery_info());
 331
 332                 /* Get load */
 333                 int load_avg = open("/proc/loadavg", O_RDONLY);
 334                 if (load_avg == -1)
 335                         die("Could not open /proc/loadavg");
 336                 read(load_avg, part, sizeof(part));
 337                 close(load_avg);
 338                 end = skip_character(part, ' ', 3);
 339                 *end = '\0';
 340                 write_to_statusbar(ORDER_LOAD "load", part);
 341
 342                 /* Get date & time */
 343                 time_t current_time = time(NULL);
 344                 struct tm *current_tm = localtime(&current_time);
 345                 strftime(part, sizeof(part), time_format, current_tm);
 346                 write_to_statusbar(ORDER_TIME "time", part);
 347
 348                 sleep(1);
 349         }
 350 }