Adding upstream version 3.2.2.upstream/3.2.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1033 insertions, 0 deletions

diff --git a/linux/Platform.c b/linux/Platform.c
new file mode 100644
index 0000000..64f25c4
--- /dev/null
+++ b/linux/Platform.c
@@ -0,0 +1,1033 @@
+/*
+htop - linux/Platform.c
+(C) 2014 Hisham H. Muhammad
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "config.h"
+
+#include "linux/Platform.h"
+
+#include <assert.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <math.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/sysmacros.h>
+
+#include "BatteryMeter.h"
+#include "ClockMeter.h"
+#include "Compat.h"
+#include "CPUMeter.h"
+#include "DateMeter.h"
+#include "DateTimeMeter.h"
+#include "DiskIOMeter.h"
+#include "HostnameMeter.h"
+#include "HugePageMeter.h"
+#include "LoadAverageMeter.h"
+#include "Macros.h"
+#include "MainPanel.h"
+#include "Meter.h"
+#include "MemoryMeter.h"
+#include "MemorySwapMeter.h"
+#include "NetworkIOMeter.h"
+#include "Object.h"
+#include "Panel.h"
+#include "PressureStallMeter.h"
+#include "ProcessList.h"
+#include "ProvideCurses.h"
+#include "linux/SELinuxMeter.h"
+#include "Settings.h"
+#include "SwapMeter.h"
+#include "SysArchMeter.h"
+#include "TasksMeter.h"
+#include "UptimeMeter.h"
+#include "XUtils.h"
+#include "linux/IOPriority.h"
+#include "linux/IOPriorityPanel.h"
+#include "linux/LinuxProcess.h"
+#include "linux/LinuxProcessList.h"
+#include "linux/SystemdMeter.h"
+#include "linux/ZramMeter.h"
+#include "linux/ZramStats.h"
+#include "zfs/ZfsArcMeter.h"
+#include "zfs/ZfsArcStats.h"
+#include "zfs/ZfsCompressedArcMeter.h"
+
+#ifdef HAVE_LIBCAP
+#include <errno.h>
+#include <sys/capability.h>
+#endif
+
+#ifdef HAVE_SENSORS_SENSORS_H
+#include "LibSensors.h"
+#endif
+
+#ifndef O_PATH
+#define O_PATH         010000000 // declare for ancient glibc versions
+#endif
+
+
+#ifdef HAVE_LIBCAP
+enum CapMode {
+   CAP_MODE_OFF,
+   CAP_MODE_BASIC,
+   CAP_MODE_STRICT
+};
+#endif
+
+bool Running_containerized = false;
+
+const ScreenDefaults Platform_defaultScreens[] = {
+   {
+      .name = "Main",
+      .columns = "PID USER PRIORITY NICE M_VIRT M_RESIDENT M_SHARE STATE PERCENT_CPU PERCENT_MEM TIME Command",
+      .sortKey = "PERCENT_CPU",
+   },
+   {
+      .name = "I/O",
+      .columns = "PID USER IO_PRIORITY IO_RATE IO_READ_RATE IO_WRITE_RATE PERCENT_SWAP_DELAY PERCENT_IO_DELAY Command",
+      .sortKey = "IO_RATE",
+   },
+};
+
+const unsigned int Platform_numberOfDefaultScreens = ARRAYSIZE(Platform_defaultScreens);
+
+const SignalItem Platform_signals[] = {
+   { .name = " 0 Cancel",    .number = 0 },
+   { .name = " 1 SIGHUP",    .number = 1 },
+   { .name = " 2 SIGINT",    .number = 2 },
+   { .name = " 3 SIGQUIT",   .number = 3 },
+   { .name = " 4 SIGILL",    .number = 4 },
+   { .name = " 5 SIGTRAP",   .number = 5 },
+   { .name = " 6 SIGABRT",   .number = 6 },
+   { .name = " 6 SIGIOT",    .number = 6 },
+   { .name = " 7 SIGBUS",    .number = 7 },
+   { .name = " 8 SIGFPE",    .number = 8 },
+   { .name = " 9 SIGKILL",   .number = 9 },
+   { .name = "10 SIGUSR1",   .number = 10 },
+   { .name = "11 SIGSEGV",   .number = 11 },
+   { .name = "12 SIGUSR2",   .number = 12 },
+   { .name = "13 SIGPIPE",   .number = 13 },
+   { .name = "14 SIGALRM",   .number = 14 },
+   { .name = "15 SIGTERM",   .number = 15 },
+   { .name = "16 SIGSTKFLT", .number = 16 },
+   { .name = "17 SIGCHLD",   .number = 17 },
+   { .name = "18 SIGCONT",   .number = 18 },
+   { .name = "19 SIGSTOP",   .number = 19 },
+   { .name = "20 SIGTSTP",   .number = 20 },
+   { .name = "21 SIGTTIN",   .number = 21 },
+   { .name = "22 SIGTTOU",   .number = 22 },
+   { .name = "23 SIGURG",    .number = 23 },
+   { .name = "24 SIGXCPU",   .number = 24 },
+   { .name = "25 SIGXFSZ",   .number = 25 },
+   { .name = "26 SIGVTALRM", .number = 26 },
+   { .name = "27 SIGPROF",   .number = 27 },
+   { .name = "28 SIGWINCH",  .number = 28 },
+   { .name = "29 SIGIO",     .number = 29 },
+   { .name = "29 SIGPOLL",   .number = 29 },
+   { .name = "30 SIGPWR",    .number = 30 },
+   { .name = "31 SIGSYS",    .number = 31 },
+};
+
+const unsigned int Platform_numberOfSignals = ARRAYSIZE(Platform_signals);
+
+static enum { BAT_PROC, BAT_SYS, BAT_ERR } Platform_Battery_method = BAT_PROC;
+static time_t Platform_Battery_cacheTime;
+static double Platform_Battery_cachePercent = NAN;
+static ACPresence Platform_Battery_cacheIsOnAC;
+
+#ifdef HAVE_LIBCAP
+static enum CapMode Platform_capabilitiesMode = CAP_MODE_BASIC;
+#endif
+
+static Htop_Reaction Platform_actionSetIOPriority(State* st) {
+   if (Settings_isReadonly())
+      return HTOP_OK;
+
+   const LinuxProcess* p = (const LinuxProcess*) Panel_getSelected((Panel*)st->mainPanel);
+   if (!p)
+      return HTOP_OK;
+
+   IOPriority ioprio1 = p->ioPriority;
+   Panel* ioprioPanel = IOPriorityPanel_new(ioprio1);
+   const void* set = Action_pickFromVector(st, ioprioPanel, 20, true);
+   if (set) {
+      IOPriority ioprio2 = IOPriorityPanel_getIOPriority(ioprioPanel);
+      bool ok = MainPanel_foreachProcess(st->mainPanel, LinuxProcess_setIOPriority, (Arg) { .i = ioprio2 }, NULL);
+      if (!ok) {
+         beep();
+      }
+   }
+   Panel_delete((Object*)ioprioPanel);
+   return HTOP_REFRESH | HTOP_REDRAW_BAR | HTOP_UPDATE_PANELHDR;
+}
+
+static bool Platform_changeAutogroupPriority(MainPanel* panel, int delta) {
+   if (LinuxProcess_isAutogroupEnabled() == false) {
+      beep();
+      return false;
+   }
+   bool anyTagged;
+   bool ok = MainPanel_foreachProcess(panel, LinuxProcess_changeAutogroupPriorityBy, (Arg) { .i = delta }, &anyTagged);
+   if (!ok)
+      beep();
+   return anyTagged;
+}
+
+static Htop_Reaction Platform_actionHigherAutogroupPriority(State* st) {
+   if (Settings_isReadonly())
+      return HTOP_OK;
+
+   bool changed = Platform_changeAutogroupPriority(st->mainPanel, -1);
+   return changed ? HTOP_REFRESH : HTOP_OK;
+}
+
+static Htop_Reaction Platform_actionLowerAutogroupPriority(State* st) {
+   if (Settings_isReadonly())
+      return HTOP_OK;
+
+   bool changed = Platform_changeAutogroupPriority(st->mainPanel, 1);
+   return changed ? HTOP_REFRESH : HTOP_OK;
+}
+
+void Platform_setBindings(Htop_Action* keys) {
+   keys['i'] = Platform_actionSetIOPriority;
+   keys['{'] = Platform_actionLowerAutogroupPriority;
+   keys['}'] = Platform_actionHigherAutogroupPriority;
+   keys[KEY_F(19)] = Platform_actionLowerAutogroupPriority;  // Shift-F7
+   keys[KEY_F(20)] = Platform_actionHigherAutogroupPriority; // Shift-F8
+}
+
+const MeterClass* const Platform_meterTypes[] = {
+   &CPUMeter_class,
+   &ClockMeter_class,
+   &DateMeter_class,
+   &DateTimeMeter_class,
+   &LoadAverageMeter_class,
+   &LoadMeter_class,
+   &MemoryMeter_class,
+   &SwapMeter_class,
+   &MemorySwapMeter_class,
+   &SysArchMeter_class,
+   &HugePageMeter_class,
+   &TasksMeter_class,
+   &UptimeMeter_class,
+   &BatteryMeter_class,
+   &HostnameMeter_class,
+   &AllCPUsMeter_class,
+   &AllCPUs2Meter_class,
+   &AllCPUs4Meter_class,
+   &AllCPUs8Meter_class,
+   &LeftCPUsMeter_class,
+   &RightCPUsMeter_class,
+   &LeftCPUs2Meter_class,
+   &RightCPUs2Meter_class,
+   &LeftCPUs4Meter_class,
+   &RightCPUs4Meter_class,
+   &LeftCPUs8Meter_class,
+   &RightCPUs8Meter_class,
+   &BlankMeter_class,
+   &PressureStallCPUSomeMeter_class,
+   &PressureStallIOSomeMeter_class,
+   &PressureStallIOFullMeter_class,
+   &PressureStallMemorySomeMeter_class,
+   &PressureStallMemoryFullMeter_class,
+   &ZfsArcMeter_class,
+   &ZfsCompressedArcMeter_class,
+   &ZramMeter_class,
+   &DiskIOMeter_class,
+   &NetworkIOMeter_class,
+   &SELinuxMeter_class,
+   &SystemdMeter_class,
+   NULL
+};
+
+int Platform_getUptime(void) {
+   double uptime = 0;
+   FILE* fd = fopen(PROCDIR "/uptime", "r");
+   if (fd) {
+      int n = fscanf(fd, "%64lf", &uptime);
+      fclose(fd);
+      if (n <= 0) {
+         return 0;
+      }
+   }
+   return floor(uptime);
+}
+
+void Platform_getLoadAverage(double* one, double* five, double* fifteen) {
+   FILE* fd = fopen(PROCDIR "/loadavg", "r");
+   if (!fd)
+      goto err;
+
+   double scanOne, scanFive, scanFifteen;
+   int r = fscanf(fd, "%lf %lf %lf", &scanOne, &scanFive, &scanFifteen);
+   fclose(fd);
+   if (r != 3)
+      goto err;
+
+   *one = scanOne;
+   *five = scanFive;
+   *fifteen = scanFifteen;
+   return;
+
+err:
+   *one = NAN;
+   *five = NAN;
+   *fifteen = NAN;
+}
+
+int Platform_getMaxPid(void) {
+   FILE* file = fopen(PROCDIR "/sys/kernel/pid_max", "r");
+   if (!file)
+      return -1;
+
+   int maxPid = 4194303;
+   int match = fscanf(file, "%32d", &maxPid);
+   (void) match;
+   fclose(file);
+   return maxPid;
+}
+
+double Platform_setCPUValues(Meter* this, unsigned int cpu) {
+   const LinuxProcessList* pl = (const LinuxProcessList*) this->pl;
+   const CPUData* cpuData = &(pl->cpuData[cpu]);
+   double total = (double) ( cpuData->totalPeriod == 0 ? 1 : cpuData->totalPeriod);
+   double percent;
+   double* v = this->values;
+
+   if (!cpuData->online) {
+      this->curItems = 0;
+      return NAN;
+   }
+
+   v[CPU_METER_NICE] = cpuData->nicePeriod / total * 100.0;
+   v[CPU_METER_NORMAL] = cpuData->userPeriod / total * 100.0;
+   if (this->pl->settings->detailedCPUTime) {
+      v[CPU_METER_KERNEL]  = cpuData->systemPeriod / total * 100.0;
+      v[CPU_METER_IRQ]     = cpuData->irqPeriod / total * 100.0;
+      v[CPU_METER_SOFTIRQ] = cpuData->softIrqPeriod / total * 100.0;
+      v[CPU_METER_STEAL]   = cpuData->stealPeriod / total * 100.0;
+      v[CPU_METER_GUEST]   = cpuData->guestPeriod / total * 100.0;
+      v[CPU_METER_IOWAIT]  = cpuData->ioWaitPeriod / total * 100.0;
+      this->curItems = 8;
+      if (this->pl->settings->accountGuestInCPUMeter) {
+         percent = v[0] + v[1] + v[2] + v[3] + v[4] + v[5] + v[6];
+      } else {
+         percent = v[0] + v[1] + v[2] + v[3] + v[4];
+      }
+   } else {
+      v[2] = cpuData->systemAllPeriod / total * 100.0;
+      v[3] = (cpuData->stealPeriod + cpuData->guestPeriod) / total * 100.0;
+      this->curItems = 4;
+      percent = v[0] + v[1] + v[2] + v[3];
+   }
+   percent = CLAMP(percent, 0.0, 100.0);
+   if (isnan(percent)) {
+      percent = 0.0;
+   }
+
+   v[CPU_METER_FREQUENCY] = cpuData->frequency;
+
+#ifdef HAVE_SENSORS_SENSORS_H
+   v[CPU_METER_TEMPERATURE] = cpuData->temperature;
+#else
+   v[CPU_METER_TEMPERATURE] = NAN;
+#endif
+
+   return percent;
+}
+
+void Platform_setMemoryValues(Meter* this) {
+   const ProcessList* pl = this->pl;
+   const LinuxProcessList* lpl = (const LinuxProcessList*) pl;
+
+   this->total     = pl->totalMem;
+   this->values[MEMORY_METER_USED] = pl->usedMem;
+   this->values[MEMORY_METER_BUFFERS] = pl->buffersMem;
+   this->values[MEMORY_METER_SHARED] = pl->sharedMem;
+   this->values[MEMORY_METER_CACHE] = pl->cachedMem;
+   this->values[MEMORY_METER_AVAILABLE] = pl->availableMem;
+
+   if (lpl->zfs.enabled != 0 && !Running_containerized) {
+      // ZFS does not shrink below the value of zfs_arc_min.
+      unsigned long long int shrinkableSize = 0;
+      if (lpl->zfs.size > lpl->zfs.min)
+         shrinkableSize = lpl->zfs.size - lpl->zfs.min;
+      this->values[MEMORY_METER_USED] -= shrinkableSize;
+      this->values[MEMORY_METER_CACHE] += shrinkableSize;
+      this->values[MEMORY_METER_AVAILABLE] += shrinkableSize;
+   }
+}
+
+void Platform_setSwapValues(Meter* this) {
+   const ProcessList* pl = this->pl;
+   this->total = pl->totalSwap;
+   this->values[0] = pl->usedSwap;
+   this->values[1] = pl->cachedSwap;
+}
+
+void Platform_setZramValues(Meter* this) {
+   const LinuxProcessList* lpl = (const LinuxProcessList*) this->pl;
+   this->total = lpl->zram.totalZram;
+   this->values[0] = lpl->zram.usedZramComp;
+   this->values[1] = lpl->zram.usedZramOrig;
+}
+
+void Platform_setZfsArcValues(Meter* this) {
+   const LinuxProcessList* lpl = (const LinuxProcessList*) this->pl;
+
+   ZfsArcMeter_readStats(this, &(lpl->zfs));
+}
+
+void Platform_setZfsCompressedArcValues(Meter* this) {
+   const LinuxProcessList* lpl = (const LinuxProcessList*) this->pl;
+
+   ZfsCompressedArcMeter_readStats(this, &(lpl->zfs));
+}
+
+char* Platform_getProcessEnv(pid_t pid) {
+   char procname[128];
+   xSnprintf(procname, sizeof(procname), PROCDIR "/%d/environ", pid);
+   FILE* fd = fopen(procname, "r");
+   if (!fd)
+      return NULL;
+
+   char* env = NULL;
+
+   size_t capacity = 0;
+   size_t size = 0;
+   ssize_t bytes = 0;
+
+   do {
+      size += bytes;
+      capacity += 4096;
+      env = xRealloc(env, capacity);
+   } while ((bytes = fread(env + size, 1, capacity - size, fd)) > 0);
+
+   fclose(fd);
+
+   if (bytes < 0) {
+      free(env);
+      return NULL;
+   }
+
+   size += bytes;
+
+   env = xRealloc(env, size + 2);
+
+   env[size] = '\0';
+   env[size + 1] = '\0';
+
+   return env;
+}
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid) {
+   FileLocks_ProcessData* pdata = xCalloc(1, sizeof(FileLocks_ProcessData));
+   DIR* dirp;
+   int dfd;
+
+   char path[PATH_MAX];
+   xSnprintf(path, sizeof(path), PROCDIR "/%d/fdinfo/", pid);
+   if (strlen(path) >= (sizeof(path) - 2))
+      goto err;
+
+   if (!(dirp = opendir(path)))
+      goto err;
+
+   if ((dfd = dirfd(dirp)) == -1) {
+      closedir(dirp);
+      goto err;
+   }
+
+   FileLocks_LockData** data_ref = &pdata->locks;
+   for (struct dirent* de; (de = readdir(dirp)); ) {
+      if (String_eq(de->d_name, ".") || String_eq(de->d_name, ".."))
+         continue;
+
+      errno = 0;
+      char *end = de->d_name;
+      int file = strtoull(de->d_name, &end, 10);
+      if (errno || *end)
+         continue;
+
+      int fd = openat(dfd, de->d_name, O_RDONLY | O_CLOEXEC);
+      if(fd == -1)
+         continue;
+      FILE *f = fdopen(fd, "r");
+      if(!f) {
+         close(fd);
+         continue;
+      }
+
+      for (char buffer[1024]; fgets(buffer, sizeof(buffer), f); ) {
+         if (!strchr(buffer, '\n'))
+            continue;
+
+         if (strncmp(buffer, "lock:\t", strlen("lock:\t")))
+            continue;
+
+         FileLocks_Data data = {.fd = file};
+         int _;
+         unsigned int maj, min;
+         char lock_end[25], locktype[32], exclusive[32], readwrite[32];
+         if (10 != sscanf(buffer + strlen("lock:\t"), "%d: %31s %31s %31s %d %x:%x:%"PRIu64" %"PRIu64" %24s",
+            &_, locktype, exclusive, readwrite, &_,
+            &maj, &min, &data.inode,
+            &data.start, lock_end))
+            continue;
+
+         data.locktype = xStrdup(locktype);
+         data.exclusive = xStrdup(exclusive);
+         data.readwrite = xStrdup(readwrite);
+         data.dev = makedev(maj, min);
+
+         if (String_eq(lock_end, "EOF"))
+            data.end = ULLONG_MAX;
+         else
+            data.end = strtoull(lock_end, NULL, 10);
+
+         xSnprintf(path, sizeof(path), PROCDIR "/%d/fd/%s", pid, de->d_name);
+         char link[PATH_MAX];
+         ssize_t link_len;
+         if (strlen(path) < (sizeof(path) - 2) && (link_len = readlink(path, link, sizeof(link))) != -1)
+            data.filename = xStrndup(link, link_len);
+
+         *data_ref = xCalloc(1, sizeof(FileLocks_LockData));
+         (*data_ref)->data = data;
+         data_ref = &(*data_ref)->next;
+      }
+
+      fclose(f);
+   }
+
+   closedir(dirp);
+   return pdata;
+
+err:
+   pdata->error = true;
+   return pdata;
+}
+
+void Platform_getPressureStall(const char* file, bool some, double* ten, double* sixty, double* threehundred) {
+   *ten = *sixty = *threehundred = 0;
+   char procname[128];
+   xSnprintf(procname, sizeof(procname), PROCDIR "/pressure/%s", file);
+   FILE* fd = fopen(procname, "r");
+   if (!fd) {
+      *ten = *sixty = *threehundred = NAN;
+      return;
+   }
+   int total = fscanf(fd, "some avg10=%32lf avg60=%32lf avg300=%32lf total=%*f ", ten, sixty, threehundred);
+   if (!some) {
+      total = fscanf(fd, "full avg10=%32lf avg60=%32lf avg300=%32lf total=%*f ", ten, sixty, threehundred);
+   }
+   (void) total;
+   assert(total == 3);
+   fclose(fd);
+}
+
+bool Platform_getDiskIO(DiskIOData* data) {
+   FILE* fd = fopen(PROCDIR "/diskstats", "r");
+   if (!fd)
+      return false;
+
+   char lastTopDisk[32] = { '\0' };
+
+   unsigned long long int read_sum = 0, write_sum = 0, timeSpend_sum = 0;
+   char lineBuffer[256];
+   while (fgets(lineBuffer, sizeof(lineBuffer), fd)) {
+      char diskname[32];
+      unsigned long long int read_tmp, write_tmp, timeSpend_tmp;
+      if (sscanf(lineBuffer, "%*d %*d %31s %*u %*u %llu %*u %*u %*u %llu %*u %*u %llu", diskname, &read_tmp, &write_tmp, &timeSpend_tmp) == 4) {
+         if (String_startsWith(diskname, "dm-"))
+            continue;
+
+         if (String_startsWith(diskname, "zram"))
+            continue;
+
+         /* only count root disks, e.g. do not count IO from sda and sda1 twice */
+         if (lastTopDisk[0] && String_startsWith(diskname, lastTopDisk))
+            continue;
+
+         /* This assumes disks are listed directly before any of their partitions */
+         String_safeStrncpy(lastTopDisk, diskname, sizeof(lastTopDisk));
+
+         read_sum += read_tmp;
+         write_sum += write_tmp;
+         timeSpend_sum += timeSpend_tmp;
+      }
+   }
+   fclose(fd);
+   /* multiply with sector size */
+   data->totalBytesRead = 512 * read_sum;
+   data->totalBytesWritten = 512 * write_sum;
+   data->totalMsTimeSpend = timeSpend_sum;
+   return true;
+}
+
+bool Platform_getNetworkIO(NetworkIOData* data) {
+   FILE* fd = fopen(PROCDIR "/net/dev", "r");
+   if (!fd)
+      return false;
+
+   memset(data, 0, sizeof(NetworkIOData));
+   char lineBuffer[512];
+   while (fgets(lineBuffer, sizeof(lineBuffer), fd)) {
+      char interfaceName[32];
+      unsigned long long int bytesReceived, packetsReceived, bytesTransmitted, packetsTransmitted;
+      if (sscanf(lineBuffer, "%31s %llu %llu %*u %*u %*u %*u %*u %*u %llu %llu",
+                             interfaceName,
+                             &bytesReceived,
+                             &packetsReceived,
+                             &bytesTransmitted,
+                             &packetsTransmitted) != 5)
+         continue;
+
+      if (String_eq(interfaceName, "lo:"))
+         continue;
+
+      data->bytesReceived += bytesReceived;
+      data->packetsReceived += packetsReceived;
+      data->bytesTransmitted += bytesTransmitted;
+      data->packetsTransmitted += packetsTransmitted;
+   }
+
+   fclose(fd);
+
+   return true;
+}
+
+// Linux battery reading by Ian P. Hands (iphands@gmail.com, ihands@redhat.com).
+
+#define PROC_BATTERY_DIR PROCDIR "/acpi/battery"
+#define PROC_POWERSUPPLY_DIR PROCDIR "/acpi/ac_adapter"
+#define PROC_POWERSUPPLY_ACSTATE_FILE PROC_POWERSUPPLY_DIR "/AC/state"
+#define SYS_POWERSUPPLY_DIR "/sys/class/power_supply"
+
+// ----------------------------------------
+// READ FROM /proc
+// ----------------------------------------
+
+static double Platform_Battery_getProcBatInfo(void) {
+   DIR* batteryDir = opendir(PROC_BATTERY_DIR);
+   if (!batteryDir)
+      return NAN;
+
+   uint64_t totalFull = 0;
+   uint64_t totalRemain = 0;
+
+   struct dirent* dirEntry = NULL;
+   while ((dirEntry = readdir(batteryDir))) {
+      const char* entryName = dirEntry->d_name;
+      if (!String_startsWith(entryName, "BAT"))
+         continue;
+
+      char filePath[256];
+      char bufInfo[1024] = {0};
+      xSnprintf(filePath, sizeof(filePath), "%s/%s/info", PROC_BATTERY_DIR, entryName);
+      ssize_t r = xReadfile(filePath, bufInfo, sizeof(bufInfo));
+      if (r < 0)
+         continue;
+
+      char bufState[1024] = {0};
+      xSnprintf(filePath, sizeof(filePath), "%s/%s/state", PROC_BATTERY_DIR, entryName);
+      r = xReadfile(filePath, bufState, sizeof(bufState));
+      if (r < 0)
+         continue;
+
+      const char* line;
+
+      //Getting total charge for all batteries
+      char* buf = bufInfo;
+      while ((line = strsep(&buf, "\n")) != NULL) {
+         char field[100] = {0};
+         int val = 0;
+         if (2 != sscanf(line, "%99[^:]:%d", field, &val))
+            continue;
+
+         if (String_eq(field, "last full capacity")) {
+            totalFull += val;
+            break;
+         }
+      }
+
+      //Getting remaining charge for all batteries
+      buf = bufState;
+      while ((line = strsep(&buf, "\n")) != NULL) {
+         char field[100] = {0};
+         int val = 0;
+         if (2 != sscanf(line, "%99[^:]:%d", field, &val))
+            continue;
+
+         if (String_eq(field, "remaining capacity")) {
+            totalRemain += val;
+            break;
+         }
+      }
+   }
+
+   closedir(batteryDir);
+
+   return totalFull > 0 ? ((double) totalRemain * 100.0) / (double) totalFull : NAN;
+}
+
+static ACPresence procAcpiCheck(void) {
+   char buffer[1024] = {0};
+   ssize_t r = xReadfile(PROC_POWERSUPPLY_ACSTATE_FILE, buffer, sizeof(buffer));
+   if (r < 1)
+      return AC_ERROR;
+
+   return String_eq(buffer, "on-line") ? AC_PRESENT : AC_ABSENT;
+}
+
+static void Platform_Battery_getProcData(double* percent, ACPresence* isOnAC) {
+   *isOnAC = procAcpiCheck();
+   *percent = AC_ERROR != *isOnAC ? Platform_Battery_getProcBatInfo() : NAN;
+}
+
+// ----------------------------------------
+// READ FROM /sys
+// ----------------------------------------
+
+static void Platform_Battery_getSysData(double* percent, ACPresence* isOnAC) {
+   *percent = NAN;
+   *isOnAC = AC_ERROR;
+
+   DIR* dir = opendir(SYS_POWERSUPPLY_DIR);
+   if (!dir)
+      return;
+
+   uint64_t totalFull = 0;
+   uint64_t totalRemain = 0;
+
+   const struct dirent* dirEntry;
+   while ((dirEntry = readdir(dir))) {
+      const char* entryName = dirEntry->d_name;
+
+#ifdef HAVE_OPENAT
+      int entryFd = openat(dirfd(dir), entryName, O_DIRECTORY | O_PATH);
+      if (entryFd < 0)
+         continue;
+#else
+      char entryFd[4096];
+      xSnprintf(entryFd, sizeof(entryFd), SYS_POWERSUPPLY_DIR "/%s", entryName);
+#endif
+
+      enum { AC, BAT } type;
+      if (String_startsWith(entryName, "BAT")) {
+         type = BAT;
+      } else if (String_startsWith(entryName, "AC")) {
+         type = AC;
+      } else {
+         char buffer[32];
+         ssize_t ret = xReadfileat(entryFd, "type", buffer, sizeof(buffer));
+         if (ret <= 0)
+            goto next;
+
+         /* drop optional trailing newlines */
+         for (char* buf = &buffer[(size_t)ret - 1]; *buf == '\n'; buf--)
+            *buf = '\0';
+
+         if (String_eq(buffer, "Battery"))
+            type = BAT;
+         else if (String_eq(buffer, "Mains"))
+            type = AC;
+         else
+            goto next;
+      }
+
+      if (type == BAT) {
+         char buffer[1024];
+         ssize_t r = xReadfileat(entryFd, "uevent", buffer, sizeof(buffer));
+         if (r < 0)
+            goto next;
+
+         bool full = false;
+         bool now = false;
+
+         double fullCharge = 0;
+         double capacityLevel = NAN;
+         const char* line;
+
+         char* buf = buffer;
+         while ((line = strsep(&buf, "\n")) != NULL) {
+            char field[100] = {0};
+            int val = 0;
+            if (2 != sscanf(line, "POWER_SUPPLY_%99[^=]=%d", field, &val))
+               continue;
+
+            if (String_eq(field, "CAPACITY")) {
+               capacityLevel = val / 100.0;
+               continue;
+            }
+
+            if (String_eq(field, "ENERGY_FULL") || String_eq(field, "CHARGE_FULL")) {
+               fullCharge = val;
+               totalFull += fullCharge;
+               full = true;
+               if (now)
+                  break;
+               continue;
+            }
+
+            if (String_eq(field, "ENERGY_NOW") || String_eq(field, "CHARGE_NOW")) {
+               totalRemain += val;
+               now = true;
+               if (full)
+                  break;
+               continue;
+            }
+         }
+
+         if (!now && full && !isnan(capacityLevel))
+            totalRemain += capacityLevel * fullCharge;
+
+      } else if (type == AC) {
+         if (*isOnAC != AC_ERROR)
+            goto next;
+
+         char buffer[2];
+         ssize_t r = xReadfileat(entryFd, "online", buffer, sizeof(buffer));
+         if (r < 1) {
+            *isOnAC = AC_ERROR;
+            goto next;
+         }
+
+         if (buffer[0] == '0')
+            *isOnAC = AC_ABSENT;
+         else if (buffer[0] == '1')
+            *isOnAC = AC_PRESENT;
+      }
+
+next:
+      Compat_openatArgClose(entryFd);
+   }
+
+   closedir(dir);
+
+   *percent = totalFull > 0 ? ((double) totalRemain * 100.0) / (double) totalFull : NAN;
+}
+
+void Platform_getBattery(double* percent, ACPresence* isOnAC) {
+   time_t now = time(NULL);
+   // update battery reading is slow. Update it each 10 seconds only.
+   if (now < Platform_Battery_cacheTime + 10) {
+      *percent = Platform_Battery_cachePercent;
+      *isOnAC = Platform_Battery_cacheIsOnAC;
+      return;
+   }
+
+   if (Platform_Battery_method == BAT_PROC) {
+      Platform_Battery_getProcData(percent, isOnAC);
+      if (isnan(*percent))
+         Platform_Battery_method = BAT_SYS;
+   }
+   if (Platform_Battery_method == BAT_SYS) {
+      Platform_Battery_getSysData(percent, isOnAC);
+      if (isnan(*percent))
+         Platform_Battery_method = BAT_ERR;
+   }
+   if (Platform_Battery_method == BAT_ERR) {
+      *percent = NAN;
+      *isOnAC = AC_ERROR;
+   } else {
+      *percent = CLAMP(*percent, 0.0, 100.0);
+   }
+   Platform_Battery_cachePercent = *percent;
+   Platform_Battery_cacheIsOnAC = *isOnAC;
+   Platform_Battery_cacheTime = now;
+}
+
+void Platform_longOptionsUsage(const char* name)
+{
+#ifdef HAVE_LIBCAP
+   printf(
+"   --drop-capabilities[=off|basic|strict] Drop Linux capabilities when running as root\n"
+"                                off - do not drop any capabilities\n"
+"                                basic (default) - drop all capabilities not needed by %s\n"
+"                                strict - drop all capabilities except those needed for\n"
+"                                         core functionality\n", name);
+#else
+   (void) name;
+#endif
+}
+
+CommandLineStatus Platform_getLongOption(int opt, int argc, char** argv) {
+#ifndef HAVE_LIBCAP
+   (void) argc;
+   (void) argv;
+#endif
+
+   switch (opt) {
+#ifdef HAVE_LIBCAP
+      case 160: {
+         const char* mode = optarg;
+         if (!mode && optind < argc && argv[optind] != NULL &&
+            (argv[optind][0] != '\0' && argv[optind][0] != '-')) {
+            mode = argv[optind++];
+         }
+
+         if (!mode || String_eq(mode, "basic")) {
+            Platform_capabilitiesMode = CAP_MODE_BASIC;
+         } else if (String_eq(mode, "off")) {
+            Platform_capabilitiesMode = CAP_MODE_OFF;
+         } else if (String_eq(mode, "strict")) {
+            Platform_capabilitiesMode = CAP_MODE_STRICT;
+         } else {
+            fprintf(stderr, "Error: invalid capabilities mode \"%s\".\n", mode);
+            return STATUS_ERROR_EXIT;
+         }
+         return STATUS_OK;
+      }
+#endif
+
+      default:
+         break;
+   }
+   return STATUS_ERROR_EXIT;
+}
+
+#ifdef HAVE_LIBCAP
+static int dropCapabilities(enum CapMode mode) {
+
+   if (mode == CAP_MODE_OFF)
+      return 0;
+
+   /* capabilities we keep to operate */
+   const cap_value_t keepcapsStrict[] = {
+      CAP_DAC_READ_SEARCH,
+      CAP_SYS_PTRACE,
+   };
+   const cap_value_t keepcapsBasic[] = {
+      CAP_DAC_READ_SEARCH,   /* read non world-readable process files of other users, like /proc/[pid]/io */
+      CAP_KILL,              /* send signals to processes of other users */
+      CAP_SYS_NICE,          /* lower process nice value / change nice value for arbitrary processes */
+      CAP_SYS_PTRACE,        /* read /proc/[pid]/exe */
+#ifdef HAVE_DELAYACCT
+      CAP_NET_ADMIN,         /* communicate over netlink socket for delay accounting */
+#endif
+   };
+   const cap_value_t* const keepcaps = (mode == CAP_MODE_BASIC) ? keepcapsBasic : keepcapsStrict;
+   const size_t ncap = (mode == CAP_MODE_BASIC) ? ARRAYSIZE(keepcapsBasic) : ARRAYSIZE(keepcapsStrict);
+
+   cap_t caps = cap_init();
+   if (caps == NULL) {
+      fprintf(stderr, "Error: can not initialize capabilities: %s\n", strerror(errno));
+      return -1;
+   }
+
+   if (cap_clear(caps) < 0) {
+      fprintf(stderr, "Error: can not clear capabilities: %s\n", strerror(errno));
+      cap_free(caps);
+      return -1;
+   }
+
+   cap_t currCaps = cap_get_proc();
+   if (currCaps == NULL) {
+      fprintf(stderr, "Error: can not get current process capabilities: %s\n", strerror(errno));
+      cap_free(caps);
+      return -1;
+   }
+
+   for (size_t i = 0; i < ncap; i++) {
+      if (!CAP_IS_SUPPORTED(keepcaps[i]))
+         continue;
+
+      cap_flag_value_t current;
+      if (cap_get_flag(currCaps, keepcaps[i], CAP_PERMITTED, &current) < 0) {
+         fprintf(stderr, "Error: can not get current value of capability %d: %s\n", keepcaps[i], strerror(errno));
+         cap_free(currCaps);
+         cap_free(caps);
+         return -1;
+      }
+
+      if (current != CAP_SET)
+         continue;
+
+      if (cap_set_flag(caps, CAP_PERMITTED, 1, &keepcaps[i], CAP_SET) < 0) {
+         fprintf(stderr, "Error: can not set permitted capability %d: %s\n", keepcaps[i], strerror(errno));
+         cap_free(currCaps);
+         cap_free(caps);
+         return -1;
+      }
+
+      if (cap_set_flag(caps, CAP_EFFECTIVE, 1, &keepcaps[i], CAP_SET) < 0) {
+         fprintf(stderr, "Error: can not set effective capability %d: %s\n", keepcaps[i], strerror(errno));
+         cap_free(currCaps);
+         cap_free(caps);
+         return -1;
+      }
+   }
+
+   if (cap_set_proc(caps) < 0) {
+      fprintf(stderr, "Error: can not set process capabilities: %s\n", strerror(errno));
+      cap_free(currCaps);
+      cap_free(caps);
+      return -1;
+   }
+
+   cap_free(currCaps);
+   cap_free(caps);
+
+   return 0;
+}
+#endif
+
+bool Platform_init(void) {
+#ifdef HAVE_LIBCAP
+   if (dropCapabilities(Platform_capabilitiesMode) < 0)
+      return false;
+#endif
+
+   if (access(PROCDIR, R_OK) != 0) {
+      fprintf(stderr, "Error: could not read procfs (compiled to look in %s).\n", PROCDIR);
+      return false;
+   }
+
+#ifdef HAVE_SENSORS_SENSORS_H
+   LibSensors_init();
+#endif
+
+   char target[PATH_MAX];
+   ssize_t ret = readlink(PROCDIR "/self/ns/pid", target, sizeof(target) - 1);
+   if (ret > 0) {
+      target[ret] = '\0';
+
+      if (!String_eq("pid:[4026531836]", target)) { // magic constant PROC_PID_INIT_INO from include/linux/proc_ns.h#L46
+         Running_containerized = true;
+         return true; // early return
+      }
+   }
+
+   FILE* fd = fopen(PROCDIR "/1/mounts", "r");
+   if (fd) {
+      char lineBuffer[256];
+      while (fgets(lineBuffer, sizeof(lineBuffer), fd)) {
+         // detect lxc or overlayfs and guess that this means we are running containerized
+         if (String_startsWith(lineBuffer, "lxcfs /proc") || String_startsWith(lineBuffer, "overlay ")) {
+            Running_containerized = true;
+            break;
+         }
+      }
+      fclose(fd);
+   } // if (fd)
+
+   return true;
+}
+
+void Platform_done(void) {
+#ifdef HAVE_SENSORS_SENSORS_H
+   LibSensors_cleanup();
+#endif
+}