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htop/linux/Platform.c

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/*
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 "Platform.h"
#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <fcntl.h>
#include <inttypes.h>
#include <limits.h>
#include <math.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.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 "IOPriority.h"
#include "IOPriorityPanel.h"
#include "LinuxProcess.h"
#include "LinuxProcessList.h"
#include "LoadAverageMeter.h"
#include "Macros.h"
#include "MainPanel.h"
#include "Meter.h"
#include "MemoryMeter.h"
#include "NetworkIOMeter.h"
#include "Object.h"
#include "Panel.h"
#include "PressureStallMeter.h"
#include "ProcessList.h"
#include "ProvideCurses.h"
#include "SELinuxMeter.h"
#include "Settings.h"
#include "SwapMeter.h"
#include "SystemdMeter.h"
#include "TasksMeter.h"
#include "UptimeMeter.h"
#include "XUtils.h"
#include "ZramMeter.h"
#include "zfs/ZfsArcMeter.h"
#include "zfs/ZfsArcStats.h"
#include "zfs/ZfsCompressedArcMeter.h"
#ifdef HAVE_LIBSENSORS
#include <sensors/sensors.h>
#endif
ProcessField Platform_defaultFields[] = { PID, USER, PRIORITY, NICE, M_SIZE, M_RESIDENT, (int)M_SHARE, STATE, PERCENT_CPU, PERCENT_MEM, TIME, COMM, 0 };
int Platform_numberOfFields = LAST_PROCESSFIELD;
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_cacheLevel = NAN;
static ACPresence Platform_Battery_cacheIsOnAC;
void Platform_init(void) {
if (access(PROCDIR, R_OK) != 0) {
fprintf(stderr, "Error: could not read procfs (compiled to look in %s).\n", PROCDIR);
exit(1);
}
#ifdef HAVE_LIBSENSORS
sensors_init(NULL);
#endif
}
void Platform_done(void) {
#ifdef HAVE_LIBSENSORS
sensors_cleanup();
#endif
}
static Htop_Reaction Platform_actionSetIOPriority(State* st) {
Panel* panel = st->panel;
LinuxProcess* p = (LinuxProcess*) Panel_getSelected(panel);
if (!p)
return HTOP_OK;
IOPriority ioprio1 = p->ioPriority;
Panel* ioprioPanel = IOPriorityPanel_new(ioprio1);
void* set = Action_pickFromVector(st, ioprioPanel, 21, true);
if (set) {
IOPriority ioprio2 = IOPriorityPanel_getIOPriority(ioprioPanel);
bool ok = MainPanel_foreachProcess((MainPanel*)panel, LinuxProcess_setIOPriority, (Arg) { .i = ioprio2 }, NULL);
if (!ok) {
beep();
}
}
Panel_delete((Object*)ioprioPanel);
return HTOP_REFRESH | HTOP_REDRAW_BAR | HTOP_UPDATE_PANELHDR;
}
void Platform_setBindings(Htop_Action* keys) {
keys['i'] = Platform_actionSetIOPriority;
}
const MeterClass* const Platform_meterTypes[] = {
&CPUMeter_class,
&ClockMeter_class,
&DateMeter_class,
&DateTimeMeter_class,
&LoadAverageMeter_class,
&LoadMeter_class,
&MemoryMeter_class,
&SwapMeter_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() {
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) {
int activeProcs, totalProcs, lastProc;
*one = 0;
*five = 0;
*fifteen = 0;
FILE* fd = fopen(PROCDIR "/loadavg", "r");
if (fd) {
int total = fscanf(fd, "%32lf %32lf %32lf %32d/%32d %32d", one, five, fifteen,
&activeProcs, &totalProcs, &lastProc);
(void) total;
assert(total == 6);
fclose(fd);
}
}
int Platform_getMaxPid() {
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, int cpu) {
const LinuxProcessList* pl = (const LinuxProcessList*) this->pl;
const CPUData* cpuData = &(pl->cpus[cpu]);
double total = (double) ( cpuData->totalPeriod == 0 ? 1 : cpuData->totalPeriod);
double percent;
double* v = this->values;
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_LIBSENSORS
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;
long int usedMem = pl->usedMem;
long int buffersMem = pl->buffersMem;
long int cachedMem = pl->cachedMem;
usedMem -= buffersMem + cachedMem;
this->total = pl->totalMem;
this->values[0] = usedMem;
this->values[1] = buffersMem;
this->values[2] = cachedMem;
if (lpl->zfs.enabled != 0) {
this->values[0] -= lpl->zfs.size;
this->values[2] += lpl->zfs.size;
}
}
void Platform_setSwapValues(Meter* this) {
const ProcessList* pl = this->pl;
this->total = pl->totalSwap;
this->values[0] = pl->usedSwap;
}
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;
}
/*
* Return the absolute path of a file given its pid&inode number
*
* Based on implementation of lslocks from util-linux:
* https://sources.debian.org/src/util-linux/2.36-3/misc-utils/lslocks.c/#L162
*/
char* Platform_getInodeFilename(pid_t pid, ino_t inode) {
struct stat sb;
struct dirent *de;
DIR *dirp;
size_t len;
int fd;
char path[PATH_MAX];
char sym[PATH_MAX];
char* ret = NULL;
memset(path, 0, sizeof(path));
memset(sym, 0, sizeof(sym));
xSnprintf(path, sizeof(path), "%s/%d/fd/", PROCDIR, pid);
if (strlen(path) >= (sizeof(path) - 2))
return NULL;
if (!(dirp = opendir(path)))
return NULL;
if ((fd = dirfd(dirp)) < 0 )
goto out;
while ((de = readdir(dirp))) {
if (String_eq(de->d_name, ".") || String_eq(de->d_name, ".."))
continue;
/* care only for numerical descriptors */
if (!strtoull(de->d_name, (char **) NULL, 10))
continue;
if (!Compat_fstatat(fd, path, de->d_name, &sb, 0) && inode != sb.st_ino)
continue;
if ((len = Compat_readlinkat(fd, path, de->d_name, sym, sizeof(sym) - 1)) < 1)
goto out;
sym[len] = '\0';
ret = xStrdup(sym);
break;
}
out:
closedir(dirp);
return ret;
}
FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid) {
FileLocks_ProcessData* pdata = xCalloc(1, sizeof(FileLocks_ProcessData));
FILE* f = fopen(PROCDIR "/locks", "r");
if (!f) {
pdata->error = true;
return pdata;
}
char buffer[1024];
FileLocks_LockData** data_ref = &pdata->locks;
while(fgets(buffer, sizeof(buffer), f)) {
if (!strchr(buffer, '\n'))
continue;
int lock_id;
char lock_type[16];
char lock_excl[16];
char lock_rw[16];
pid_t lock_pid;
unsigned int lock_dev[2];
uint64_t lock_inode;
char lock_start[25];
char lock_end[25];
if (10 != sscanf(buffer, "%d: %15s %15s %15s %d %x:%x:%"PRIu64" %24s %24s",
&lock_id, lock_type, lock_excl, lock_rw, &lock_pid,
&lock_dev[0], &lock_dev[1], &lock_inode,
lock_start, lock_end))
continue;
if (pid != lock_pid)
continue;
FileLocks_LockData* ldata = xCalloc(1, sizeof(FileLocks_LockData));
FileLocks_Data* data = &ldata->data;
data->id = lock_id;
data->locktype = xStrdup(lock_type);
data->exclusive = xStrdup(lock_excl);
data->readwrite = xStrdup(lock_rw);
data->filename = Platform_getInodeFilename(lock_pid, lock_inode);
data->dev[0] = lock_dev[0];
data->dev[1] = lock_dev[1];
data->inode = lock_inode;
data->start = strtoull(lock_start, NULL, 10);
if (!String_eq(lock_end, "EOF")) {
data->end = strtoull(lock_end, NULL, 10);
} else {
data->end = ULLONG_MAX;
}
*data_ref = ldata;
data_ref = &ldata->next;
}
fclose(f);
return pdata;
}
void Platform_getPressureStall(const char* file, bool some, double* ten, double* sixty, double* threehundred) {
*ten = *sixty = *threehundred = 0;
char procname[128 + 1];
xSnprintf(procname, 128, 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;
unsigned 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 int read_tmp, write_tmp, timeSpend_tmp;
if (sscanf(lineBuffer, "%*d %*d %31s %*u %*u %lu %*u %*u %*u %lu %*u %*u %lu", diskname, &read_tmp, &write_tmp, &timeSpend_tmp) == 4) {
if (String_startsWith(diskname, "dm-"))
continue;
/* only count root disks, e.g. do not count IO from sda and sda1 twice */
if ((diskname[0] == 's' || diskname[0] == 'h')
&& diskname[1] == 'd'
&& isalpha((unsigned char)diskname[2])
&& isdigit((unsigned char)diskname[3]))
continue;
/* only count root disks, e.g. do not count IO from mmcblk0 and mmcblk0p1 twice */
if (diskname[0] == 'm'
&& diskname[1] == 'm'
&& diskname[2] == 'c'
&& diskname[3] == 'b'
&& diskname[4] == 'l'
&& diskname[5] == 'k'
&& isdigit((unsigned char)diskname[6])
&& diskname[7] == 'p')
continue;
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(unsigned long int* bytesReceived,
unsigned long int* packetsReceived,
unsigned long int* bytesTransmitted,
unsigned long int* packetsTransmitted) {
FILE* fd = fopen(PROCDIR "/net/dev", "r");
if (!fd)
return false;
unsigned long int bytesReceivedSum = 0, packetsReceivedSum = 0, bytesTransmittedSum = 0, packetsTransmittedSum = 0;
char lineBuffer[512];
while (fgets(lineBuffer, sizeof(lineBuffer), fd)) {
char interfaceName[32];
unsigned long int bytesReceivedParsed, packetsReceivedParsed, bytesTransmittedParsed, packetsTransmittedParsed;
if (sscanf(lineBuffer, "%31s %lu %lu %*u %*u %*u %*u %*u %*u %lu %lu",
interfaceName,
&bytesReceivedParsed,
&packetsReceivedParsed,
&bytesTransmittedParsed,
&packetsTransmittedParsed) != 5)
continue;
if (String_eq(interfaceName, "lo:"))
continue;
bytesReceivedSum += bytesReceivedParsed;
packetsReceivedSum += packetsReceivedParsed;
bytesTransmittedSum += bytesTransmittedParsed;
packetsTransmittedSum += packetsTransmittedParsed;
}
fclose(fd);
*bytesReceived = bytesReceivedSum;
*packetsReceived = packetsReceivedSum;
*bytesTransmitted = bytesTransmittedSum;
*packetsTransmitted = packetsTransmittedSum;
return true;
}
// Linux battery reading by Ian P. Hands (iphands@gmail.com, ihands@redhat.com).
#define MAX_BATTERIES 64
#define PROC_BATTERY_DIR PROCDIR "/acpi/battery"
#define PROC_POWERSUPPLY_DIR PROCDIR "/acpi/ac_adapter"
#define SYS_POWERSUPPLY_DIR "/sys/class/power_supply"
// ----------------------------------------
// READ FROM /proc
// ----------------------------------------
static unsigned long int parseBatInfo(const char* fileName, const unsigned short int lineNum, const unsigned short int wordNum) {
const char batteryPath[] = PROC_BATTERY_DIR;
DIR* batteryDir = opendir(batteryPath);
if (!batteryDir)
return 0;
char* batteries[MAX_BATTERIES];
unsigned int nBatteries = 0;
memset(batteries, 0, MAX_BATTERIES * sizeof(char*));
while (nBatteries < MAX_BATTERIES) {
struct dirent* dirEntry = readdir(batteryDir);
if (!dirEntry)
break;
char* entryName = dirEntry->d_name;
if (!String_startsWith(entryName, "BAT"))
continue;
batteries[nBatteries] = xStrdup(entryName);
nBatteries++;
}
closedir(batteryDir);
unsigned long int total = 0;
for (unsigned int i = 0; i < nBatteries; i++) {
char infoPath[30];
xSnprintf(infoPath, sizeof infoPath, "%s%s/%s", batteryPath, batteries[i], fileName);
FILE* file = fopen(infoPath, "r");
if (!file)
break;
char* line = NULL;
for (unsigned short int j = 0; j < lineNum; j++) {
free(line);
line = String_readLine(file);
if (!line)
break;
}
fclose(file);
if (!line)
break;
char* foundNumStr = String_getToken(line, wordNum);
const unsigned long int foundNum = atoi(foundNumStr);
free(foundNumStr);
free(line);
total += foundNum;
}
for (unsigned int i = 0; i < nBatteries; i++)
free(batteries[i]);
return total;
}
static ACPresence procAcpiCheck(void) {
ACPresence isOn = AC_ERROR;
const char* power_supplyPath = PROC_POWERSUPPLY_DIR;
DIR* dir = opendir(power_supplyPath);
if (!dir)
return AC_ERROR;
for (;;) {
struct dirent* dirEntry = readdir(dir);
if (!dirEntry)
break;
const char* entryName = dirEntry->d_name;
if (entryName[0] != 'A')
continue;
char statePath[256];
xSnprintf(statePath, sizeof(statePath), "%s/%s/state", power_supplyPath, entryName);
FILE* file = fopen(statePath, "r");
if (!file) {
isOn = AC_ERROR;
continue;
}
char* line = String_readLine(file);
fclose(file);
if (!line)
continue;
char* isOnline = String_getToken(line, 2);
free(line);
if (String_eq(isOnline, "on-line"))
isOn = AC_PRESENT;
else
isOn = AC_ABSENT;
free(isOnline);
if (isOn == AC_PRESENT)
break;
}
if (dir)
closedir(dir);
return isOn;
}
static double Platform_Battery_getProcBatInfo(void) {
const unsigned long int totalFull = parseBatInfo("info", 3, 4);
if (totalFull == 0)
return NAN;
const unsigned long int totalRemain = parseBatInfo("state", 5, 3);
if (totalRemain == 0)
return NAN;
return totalRemain * 100.0 / (double) totalFull;
}
static void Platform_Battery_getProcData(double* level, ACPresence* isOnAC) {
*isOnAC = procAcpiCheck();
*level = AC_ERROR != *isOnAC ? Platform_Battery_getProcBatInfo() : NAN;
}
// ----------------------------------------
// READ FROM /sys
// ----------------------------------------
static inline ssize_t xread(int fd, void* buf, size_t count) {
// Read some bytes. Retry on EINTR and when we don't get as many bytes as we requested.
size_t alreadyRead = 0;
for (;;) {
ssize_t res = read(fd, buf, count);
if (res == -1) {
if (errno == EINTR)
continue;
return -1;
}
if (res > 0) {
buf = ((char*)buf) + res;
count -= res;
alreadyRead += res;
}
if (count == 0 || res == 0)
return alreadyRead;
}
}
static void Platform_Battery_getSysData(double* level, ACPresence* isOnAC) {
*level = NAN;
*isOnAC = AC_ERROR;
DIR* dir = opendir(SYS_POWERSUPPLY_DIR);
if (!dir)
return;
unsigned long int totalFull = 0;
unsigned long int totalRemain = 0;
for (;;) {
struct dirent* dirEntry = readdir(dir);
if (!dirEntry)
break;
const char* entryName = dirEntry->d_name;
char filePath[256];
xSnprintf(filePath, sizeof filePath, SYS_POWERSUPPLY_DIR "/%s/type", entryName);
int fd1 = open(filePath, O_RDONLY);
if (fd1 == -1)
continue;
char type[8];
ssize_t typelen = xread(fd1, type, 7);
close(fd1);
if (typelen < 1)
continue;
if (type[0] == 'B' && type[1] == 'a' && type[2] == 't') {
xSnprintf(filePath, sizeof filePath, SYS_POWERSUPPLY_DIR "/%s/uevent", entryName);
int fd2 = open(filePath, O_RDONLY);
if (fd2 == -1) {
closedir(dir);
return;
}
char buffer[1024];
ssize_t buflen = xread(fd2, buffer, 1023);
close(fd2);
if (buflen < 1) {
closedir(dir);
return;
}
buffer[buflen] = '\0';
char* buf = buffer;
char* line = NULL;
bool full = false;
bool now = false;
int fullSize = 0;
double capacityLevel = NAN;
#define match(str,prefix) \
(String_startsWith(str,prefix) ? (str) + strlen(prefix) : NULL)
while ((line = strsep(&buf, "\n")) != NULL) {
const char* ps = match(line, "POWER_SUPPLY_");
if (!ps)
continue;
const char* capacity = match(ps, "CAPACITY=");
if (capacity)
capacityLevel = atoi(capacity) / 100.0;
const char* energy = match(ps, "ENERGY_");
if (!energy)
energy = match(ps, "CHARGE_");
if (!energy)
continue;
const char* value = (!full) ? match(energy, "FULL=") : NULL;
if (value) {
fullSize = atoi(value);
totalFull += fullSize;
full = true;
if (now)
break;
continue;
}
value = (!now) ? match(energy, "NOW=") : NULL;
if (value) {
totalRemain += atoi(value);
now = true;
if (full)
break;
continue;
}
}
#undef match
if (!now && full && !isnan(capacityLevel))
totalRemain += (capacityLevel * fullSize);
} else if (entryName[0] == 'A') {
if (*isOnAC != AC_ERROR)
continue;
xSnprintf(filePath, sizeof filePath, SYS_POWERSUPPLY_DIR "/%s/online", entryName);
int fd3 = open(filePath, O_RDONLY);
if (fd3 == -1) {
closedir(dir);
return;
}
char buffer[2] = "";
for (;;) {
ssize_t res = read(fd3, buffer, 1);
if (res == -1 && errno == EINTR)
continue;
break;
}
close(fd3);
if (buffer[0] == '0')
*isOnAC = AC_ABSENT;
else if (buffer[0] == '1')
*isOnAC = AC_PRESENT;
}
}
closedir(dir);
*level = totalFull > 0 ? ((double) totalRemain * 100.0) / (double) totalFull : NAN;
}
void Platform_getBattery(double* level, ACPresence* isOnAC) {
time_t now = time(NULL);
// update battery reading is slow. Update it each 10 seconds only.
if (now < Platform_Battery_cacheTime + 10) {
*level = Platform_Battery_cacheLevel;
*isOnAC = Platform_Battery_cacheIsOnAC;
return;
}
if (Platform_Battery_method == BAT_PROC) {
Platform_Battery_getProcData(level, isOnAC);
if (isnan(*level))
Platform_Battery_method = BAT_SYS;
}
if (Platform_Battery_method == BAT_SYS) {
Platform_Battery_getSysData(level, isOnAC);
if (isnan(*level))
Platform_Battery_method = BAT_ERR;
}
if (Platform_Battery_method == BAT_ERR) {
*level = NAN;
*isOnAC = AC_ERROR;
} else {
*level = CLAMP(*level, 0.0, 100.0);
}
Platform_Battery_cacheLevel = *level;
Platform_Battery_cacheIsOnAC = *isOnAC;
Platform_Battery_cacheTime = now;
}
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