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htop/linux/LinuxProcessList.c

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/*
htop - LinuxProcessList.c
(C) 2014 Hisham H. Muhammad
Released under the GNU GPL, see the COPYING file
in the source distribution for its full text.
*/
#include "LinuxProcessList.h"
#include "LinuxProcess.h"
#include "CRT.h"
#include "StringUtils.h"
#include <errno.h>
#include <sys/time.h>
#include <sys/utsname.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <stdbool.h>
#include <stdarg.h>
#include <math.h>
#include <string.h>
#include <time.h>
#include <assert.h>
#include <sys/types.h>
#include <fcntl.h>
/*{
#include "ProcessList.h"
typedef struct CPUData_ {
unsigned long long int totalTime;
unsigned long long int userTime;
unsigned long long int systemTime;
unsigned long long int systemAllTime;
unsigned long long int idleAllTime;
unsigned long long int idleTime;
unsigned long long int niceTime;
unsigned long long int ioWaitTime;
unsigned long long int irqTime;
unsigned long long int softIrqTime;
unsigned long long int stealTime;
unsigned long long int guestTime;
unsigned long long int totalPeriod;
unsigned long long int userPeriod;
unsigned long long int systemPeriod;
unsigned long long int systemAllPeriod;
unsigned long long int idleAllPeriod;
unsigned long long int idlePeriod;
unsigned long long int nicePeriod;
unsigned long long int ioWaitPeriod;
unsigned long long int irqPeriod;
unsigned long long int softIrqPeriod;
unsigned long long int stealPeriod;
unsigned long long int guestPeriod;
} CPUData;
typedef struct TtyDriver_ {
char* path;
unsigned int major;
unsigned int minorFrom;
unsigned int minorTo;
} TtyDriver;
typedef struct LinuxProcessList_ {
ProcessList super;
CPUData* cpus;
TtyDriver* ttyDrivers;
} LinuxProcessList;
#ifndef PROCDIR
#define PROCDIR "/proc"
#endif
#ifndef PROCSTATFILE
#define PROCSTATFILE PROCDIR "/stat"
#endif
#ifndef PROCMEMINFOFILE
#define PROCMEMINFOFILE PROCDIR "/meminfo"
#endif
#ifndef PROCTTYDRIVERSFILE
#define PROCTTYDRIVERSFILE PROCDIR "/tty/drivers"
#endif
#ifndef PROC_LINE_LENGTH
#define PROC_LINE_LENGTH 512
#endif
}*/
#ifndef CLAMP
#define CLAMP(x,low,high) (((x)>(high))?(high):(((x)<(low))?(low):(x)))
#endif
static 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 && errno == EINTR) continue;
if (res > 0) {
buf = ((char*)buf)+res;
count -= res;
alreadyRead += res;
}
if (res == -1) return -1;
if (count == 0 || res == 0) return alreadyRead;
}
}
static int sortTtyDrivers(const void* va, const void* vb) {
TtyDriver* a = (TtyDriver*) va;
TtyDriver* b = (TtyDriver*) vb;
return (a->major == b->major) ? (a->minorFrom - b->minorFrom) : (a->major - b->major);
}
static void LinuxProcessList_initTtyDrivers(LinuxProcessList* this) {
TtyDriver* ttyDrivers;
int fd = open(PROCTTYDRIVERSFILE, O_RDONLY);
if (fd == -1)
return;
char* buf = NULL;
int bufSize = MAX_READ;
int bufLen = 0;
for(;;) {
buf = realloc(buf, bufSize);
int size = xread(fd, buf + bufLen, MAX_READ);
if (size <= 0) {
buf[bufLen] = '\0';
close(fd);
break;
}
bufLen += size;
bufSize += MAX_READ;
}
if (bufLen == 0) {
free(buf);
return;
}
int numDrivers = 0;
int allocd = 10;
ttyDrivers = malloc(sizeof(TtyDriver) * allocd);
char* at = buf;
while (*at != '\0') {
at = strchr(at, ' '); // skip first token
while (*at == ' ') at++; // skip spaces
char* token = at; // mark beginning of path
at = strchr(at, ' '); // find end of path
*at = '\0'; at++; // clear and skip
ttyDrivers[numDrivers].path = strdup(token); // save
while (*at == ' ') at++; // skip spaces
token = at; // mark beginning of major
at = strchr(at, ' '); // find end of major
*at = '\0'; at++; // clear and skip
ttyDrivers[numDrivers].major = atoi(token); // save
while (*at == ' ') at++; // skip spaces
token = at; // mark beginning of minorFrom
while (*at >= '0' && *at <= '9') at++; //find end of minorFrom
if (*at == '-') { // if has range
*at = '\0'; at++; // clear and skip
ttyDrivers[numDrivers].minorFrom = atoi(token); // save
token = at; // mark beginning of minorTo
at = strchr(at, ' '); // find end of minorTo
*at = '\0'; at++; // clear and skip
ttyDrivers[numDrivers].minorTo = atoi(token); // save
} else { // no range
*at = '\0'; at++; // clear and skip
ttyDrivers[numDrivers].minorFrom = atoi(token); // save
ttyDrivers[numDrivers].minorTo = atoi(token); // save
}
at = strchr(at, '\n'); // go to end of line
at++; // skip
numDrivers++;
if (numDrivers == allocd) {
allocd += 10;
ttyDrivers = realloc(ttyDrivers, sizeof(TtyDriver) * allocd);
}
}
free(buf);
numDrivers++;
ttyDrivers = realloc(ttyDrivers, sizeof(TtyDriver) * numDrivers);
ttyDrivers[numDrivers - 1].path = NULL;
qsort(ttyDrivers, numDrivers - 1, sizeof(TtyDriver), sortTtyDrivers);
this->ttyDrivers = ttyDrivers;
}
ProcessList* ProcessList_new(UsersTable* usersTable, Hashtable* pidWhiteList, uid_t userId) {
LinuxProcessList* this = xCalloc(1, sizeof(LinuxProcessList));
ProcessList* pl = &(this->super);
ProcessList_init(pl, Class(LinuxProcess), usersTable, pidWhiteList, userId);
LinuxProcessList_initTtyDrivers(this);
// Update CPU count:
FILE* file = fopen(PROCSTATFILE, "r");
if (file == NULL) {
CRT_fatalError("Cannot open " PROCSTATFILE);
}
char buffer[PROC_LINE_LENGTH + 1];
int cpus = -1;
do {
cpus++;
char * s = fgets(buffer, PROC_LINE_LENGTH, file);
(void) s;
} while (String_startsWith(buffer, "cpu"));
fclose(file);
pl->cpuCount = MAX(cpus - 1, 1);
this->cpus = xCalloc(cpus, sizeof(CPUData));
for (int i = 0; i < cpus; i++) {
this->cpus[i].totalTime = 1;
this->cpus[i].totalPeriod = 1;
}
return pl;
}
void ProcessList_delete(ProcessList* pl) {
LinuxProcessList* this = (LinuxProcessList*) pl;
ProcessList_done(pl);
free(this->cpus);
if (this->ttyDrivers) {
for(int i = 0; this->ttyDrivers[i].path; i++) {
free(this->ttyDrivers[i].path);
}
free(this->ttyDrivers);
}
free(this);
}
static double jiffy = 0.0;
static inline unsigned long long LinuxProcess_adjustTime(unsigned long long t) {
if(jiffy == 0.0) jiffy = sysconf(_SC_CLK_TCK);
double jiffytime = 1.0 / jiffy;
return (unsigned long long) t * jiffytime * 100;
}
static bool LinuxProcessList_readStatFile(Process *process, const char* dirname, const char* name, char* command, int* commLen) {
LinuxProcess* lp = (LinuxProcess*) process;
char filename[MAX_NAME+1];
xSnprintf(filename, MAX_NAME, "%s/%s/stat", dirname, name);
int fd = open(filename, O_RDONLY);
if (fd == -1)
return false;
static char buf[MAX_READ+1];
int size = xread(fd, buf, MAX_READ);
close(fd);
if (size <= 0) return false;
buf[size] = '\0';
assert(process->pid == atoi(buf));
char *location = strchr(buf, ' ');
if (!location) return false;
location += 2;
char *end = strrchr(location, ')');
if (!end) return false;
int commsize = end - location;
memcpy(command, location, commsize);
command[commsize] = '\0';
*commLen = commsize;
location = end + 2;
process->state = location[0];
location += 2;
process->ppid = strtol(location, &location, 10);
location += 1;
process->pgrp = strtoul(location, &location, 10);
location += 1;
process->session = strtoul(location, &location, 10);
location += 1;
process->tty_nr = strtoul(location, &location, 10);
location += 1;
process->tpgid = strtol(location, &location, 10);
location += 1;
process->flags = strtoul(location, &location, 10);
location += 1;
process->minflt = strtoull(location, &location, 10);
location += 1;
lp->cminflt = strtoull(location, &location, 10);
location += 1;
process->majflt = strtoull(location, &location, 10);
location += 1;
lp->cmajflt = strtoull(location, &location, 10);
location += 1;
lp->utime = LinuxProcess_adjustTime(strtoull(location, &location, 10));
location += 1;
lp->stime = LinuxProcess_adjustTime(strtoull(location, &location, 10));
location += 1;
lp->cutime = LinuxProcess_adjustTime(strtoull(location, &location, 10));
location += 1;
lp->cstime = LinuxProcess_adjustTime(strtoull(location, &location, 10));
location += 1;
process->priority = strtol(location, &location, 10);
location += 1;
process->nice = strtol(location, &location, 10);
location += 1;
process->nlwp = strtol(location, &location, 10);
location += 1;
for (int i=0; i<17; i++) location = strchr(location, ' ')+1;
process->exit_signal = strtol(location, &location, 10);
location += 1;
assert(location != NULL);
process->processor = strtol(location, &location, 10);
process->time = lp->utime + lp->stime;
return true;
}
static bool LinuxProcessList_statProcessDir(Process* process, const char* dirname, char* name, time_t curTime) {
char filename[MAX_NAME+1];
filename[MAX_NAME] = '\0';
xSnprintf(filename, MAX_NAME, "%s/%s", dirname, name);
struct stat sstat;
int statok = stat(filename, &sstat);
if (statok == -1)
return false;
process->st_uid = sstat.st_uid;
struct tm date;
time_t ctime = sstat.st_ctime;
process->starttime_ctime = ctime;
(void) localtime_r((time_t*) &ctime, &date);
strftime(process->starttime_show, 7, ((ctime > curTime - 86400) ? "%R " : "%b%d "), &date);
return true;
}
#ifdef HAVE_TASKSTATS
static void LinuxProcessList_readIoFile(LinuxProcess* process, const char* dirname, char* name, unsigned long long now) {
char filename[MAX_NAME+1];
filename[MAX_NAME] = '\0';
xSnprintf(filename, MAX_NAME, "%s/%s/io", dirname, name);
int fd = open(filename, O_RDONLY);
if (fd == -1) {
process->io_rate_read_bps = -1;
process->io_rate_write_bps = -1;
process->io_rchar = -1LL;
process->io_wchar = -1LL;
process->io_syscr = -1LL;
process->io_syscw = -1LL;
process->io_read_bytes = -1LL;
process->io_write_bytes = -1LL;
process->io_cancelled_write_bytes = -1LL;
process->io_rate_read_time = -1LL;
process->io_rate_write_time = -1LL;
return;
}
char buffer[1024];
ssize_t buflen = xread(fd, buffer, 1023);
close(fd);
if (buflen < 1) return;
buffer[buflen] = '\0';
unsigned long long last_read = process->io_read_bytes;
unsigned long long last_write = process->io_write_bytes;
char *buf = buffer;
char *line = NULL;
while ((line = strsep(&buf, "\n")) != NULL) {
switch (line[0]) {
case 'r':
if (line[1] == 'c' && strncmp(line+2, "har: ", 5) == 0)
process->io_rchar = strtoull(line+7, NULL, 10);
else if (strncmp(line+1, "ead_bytes: ", 11) == 0) {
process->io_read_bytes = strtoull(line+12, NULL, 10);
process->io_rate_read_bps =
((double)(process->io_read_bytes - last_read))/(((double)(now - process->io_rate_read_time))/1000);
process->io_rate_read_time = now;
}
break;
case 'w':
if (line[1] == 'c' && strncmp(line+2, "har: ", 5) == 0)
process->io_wchar = strtoull(line+7, NULL, 10);
else if (strncmp(line+1, "rite_bytes: ", 12) == 0) {
process->io_write_bytes = strtoull(line+13, NULL, 10);
process->io_rate_write_bps =
((double)(process->io_write_bytes - last_write))/(((double)(now - process->io_rate_write_time))/1000);
process->io_rate_write_time = now;
}
break;
case 's':
if (line[5] == 'r' && strncmp(line+1, "yscr: ", 6) == 0) {
process->io_syscr = strtoull(line+7, NULL, 10);
} else if (strncmp(line+1, "yscw: ", 6) == 0) {
process->io_syscw = strtoull(line+7, NULL, 10);
}
break;
case 'c':
if (strncmp(line+1, "ancelled_write_bytes: ", 22) == 0) {
process->io_cancelled_write_bytes = strtoull(line+23, NULL, 10);
}
}
}
}
#endif
static bool LinuxProcessList_readStatmFile(LinuxProcess* process, const char* dirname, const char* name) {
char filename[MAX_NAME+1];
xSnprintf(filename, MAX_NAME, "%s/%s/statm", dirname, name);
int fd = open(filename, O_RDONLY);
if (fd == -1)
return false;
char buf[PROC_LINE_LENGTH + 1];
ssize_t rres = xread(fd, buf, PROC_LINE_LENGTH);
close(fd);
if (rres < 1) return false;
char *p = buf;
errno = 0;
process->super.m_size = strtol(p, &p, 10); if (*p == ' ') p++;
process->super.m_resident = strtol(p, &p, 10); if (*p == ' ') p++;
process->m_share = strtol(p, &p, 10); if (*p == ' ') p++;
process->m_trs = strtol(p, &p, 10); if (*p == ' ') p++;
process->m_lrs = strtol(p, &p, 10); if (*p == ' ') p++;
process->m_drs = strtol(p, &p, 10); if (*p == ' ') p++;
process->m_dt = strtol(p, &p, 10);
return (errno == 0);
}
#ifdef HAVE_OPENVZ
static void LinuxProcessList_readOpenVZData(LinuxProcess* process, const char* dirname, const char* name) {
if ( (access("/proc/vz", R_OK) != 0)) {
process->vpid = process->super.pid;
process->ctid = 0;
return;
}
char filename[MAX_NAME+1];
xSnprintf(filename, MAX_NAME, "%s/%s/stat", dirname, name);
FILE* file = fopen(filename, "r");
if (!file)
return;
(void) fscanf(file,
"%*32u %*32s %*1c %*32u %*32u %*32u %*32u %*32u %*32u %*32u "
"%*32u %*32u %*32u %*32u %*32u %*32u %*32u %*32u "
"%*32u %*32u %*32u %*32u %*32u %*32u %*32u %*32u "
"%*32u %*32u %*32u %*32u %*32u %*32u %*32u %*32u "
"%*32u %*32u %*32u %*32u %*32u %*32u %*32u %*32u "
"%*32u %*32u %*32u %*32u %*32u %*32u %*32u "
"%*32u %*32u %32u %32u",
&process->vpid, &process->ctid);
fclose(file);
return;
}
#endif
#ifdef HAVE_CGROUP
static void LinuxProcessList_readCGroupFile(LinuxProcess* process, const char* dirname, const char* name) {
char filename[MAX_NAME+1];
xSnprintf(filename, MAX_NAME, "%s/%s/cgroup", dirname, name);
FILE* file = fopen(filename, "r");
if (!file) {
process->cgroup = xStrdup("");
return;
}
char output[PROC_LINE_LENGTH + 1];
output[0] = '\0';
char* at = output;
int left = PROC_LINE_LENGTH;
while (!feof(file) && left > 0) {
char buffer[PROC_LINE_LENGTH + 1];
char *ok = fgets(buffer, PROC_LINE_LENGTH, file);
if (!ok) break;
char* group = strchr(buffer, ':');
if (!group) break;
if (at != output) {
*at = ';';
at++;
left--;
}
int wrote = snprintf(at, left, "%s", group);
left -= wrote;
}
fclose(file);
free(process->cgroup);
process->cgroup = xStrdup(output);
}
#endif
#ifdef HAVE_VSERVER
static void LinuxProcessList_readVServerData(LinuxProcess* process, const char* dirname, const char* name) {
char filename[MAX_NAME+1];
xSnprintf(filename, MAX_NAME, "%s/%s/status", dirname, name);
FILE* file = fopen(filename, "r");
if (!file)
return;
char buffer[PROC_LINE_LENGTH + 1];
process->vxid = 0;
while (fgets(buffer, PROC_LINE_LENGTH, file)) {
if (String_startsWith(buffer, "VxID:")) {
int vxid;
int ok = sscanf(buffer, "VxID:\t%32d", &vxid);
if (ok >= 1) {
process->vxid = vxid;
}
}
#if defined HAVE_ANCIENT_VSERVER
else if (String_startsWith(buffer, "s_context:")) {
int vxid;
int ok = sscanf(buffer, "s_context:\t%32d", &vxid);
if (ok >= 1) {
process->vxid = vxid;
}
}
#endif
}
fclose(file);
}
#endif
static void LinuxProcessList_readOomData(LinuxProcess* process, const char* dirname, const char* name) {
char filename[MAX_NAME+1];
xSnprintf(filename, MAX_NAME, "%s/%s/oom_score", dirname, name);
FILE* file = fopen(filename, "r");
if (!file) {
return;
}
char buffer[PROC_LINE_LENGTH + 1];
if (fgets(buffer, PROC_LINE_LENGTH, file)) {
unsigned int oom;
int ok = sscanf(buffer, "%32u", &oom);
if (ok >= 1) {
process->oom = oom;
}
}
fclose(file);
}
static void setCommand(Process* process, const char* command, int len) {
if (process->comm && process->commLen >= len) {
strncpy(process->comm, command, len + 1);
} else {
free(process->comm);
process->comm = xStrdup(command);
}
process->commLen = len;
}
static bool LinuxProcessList_readCmdlineFile(Process* process, const char* dirname, const char* name) {
if (Process_isKernelThread(process))
return true;
char filename[MAX_NAME+1];
xSnprintf(filename, MAX_NAME, "%s/%s/cmdline", dirname, name);
int fd = open(filename, O_RDONLY);
if (fd == -1)
return false;
char command[4096+1]; // max cmdline length on Linux
int amtRead = xread(fd, command, sizeof(command) - 1);
close(fd);
int tokenEnd = 0;
int lastChar = 0;
if (amtRead <= 0) {
return false;
}
for (int i = 0; i < amtRead; i++) {
if (command[i] == '\0' || command[i] == '\n') {
if (tokenEnd == 0) {
tokenEnd = i;
}
command[i] = ' ';
} else {
lastChar = i;
}
}
if (tokenEnd == 0) {
tokenEnd = amtRead;
}
command[lastChar + 1] = '\0';
process->basenameOffset = tokenEnd;
setCommand(process, command, lastChar);
return true;
}
static char* LinuxProcessList_updateTtyDevice(TtyDriver* ttyDrivers, unsigned int tty_nr) {
unsigned int maj = major(tty_nr);
unsigned int min = minor(tty_nr);
int i = -1;
for (;;) {
i++;
if ((!ttyDrivers[i].path) || maj < ttyDrivers[i].major) {
break;
}
if (maj > ttyDrivers[i].major) {
continue;
}
if (min < ttyDrivers[i].minorFrom) {
break;
}
if (min > ttyDrivers[i].minorTo) {
continue;
}
unsigned int idx = min - ttyDrivers[i].minorFrom;
struct stat sstat;
char* fullPath;
for(;;) {
asprintf(&fullPath, "%s/%d", ttyDrivers[i].path, idx);
int err = stat(fullPath, &sstat);
if (err == 0 && major(sstat.st_rdev) == maj && minor(sstat.st_rdev) == min) return fullPath;
free(fullPath);
asprintf(&fullPath, "%s%d", ttyDrivers[i].path, idx);
err = stat(fullPath, &sstat);
if (err == 0 && major(sstat.st_rdev) == maj && minor(sstat.st_rdev) == min) return fullPath;
free(fullPath);
if (idx == min) break;
idx = min;
}
int err = stat(ttyDrivers[i].path, &sstat);
if (err == 0 && tty_nr == sstat.st_rdev) return strdup(ttyDrivers[i].path);
}
char* out;
asprintf(&out, "/dev/%u:%u", maj, min);
return out;
}
static bool LinuxProcessList_recurseProcTree(LinuxProcessList* this, const char* dirname, Process* parent, double period, struct timeval tv) {
ProcessList* pl = (ProcessList*) this;
DIR* dir;
struct dirent* entry;
Settings* settings = pl->settings;
time_t curTime = tv.tv_sec;
#ifdef HAVE_TASKSTATS
unsigned long long now = tv.tv_sec*1000LL+tv.tv_usec/1000LL;
#endif
dir = opendir(dirname);
if (!dir) return false;
int cpus = pl->cpuCount;
bool hideKernelThreads = settings->hideKernelThreads;
bool hideUserlandThreads = settings->hideUserlandThreads;
while ((entry = readdir(dir)) != NULL) {
char* name = entry->d_name;
// The RedHat kernel hides threads with a dot.
// I believe this is non-standard.
if ((!settings->hideThreads) && name[0] == '.') {
name++;
}
// Just skip all non-number directories.
if (name[0] < '0' || name[0] > '9') {
continue;
}
// filename is a number: process directory
int pid = atoi(name);
if (parent && pid == parent->pid)
continue;
if (pid <= 0)
continue;
bool preExisting = false;
Process* proc = ProcessList_getProcess(pl, pid, &preExisting, (Process_New) LinuxProcess_new);
proc->tgid = parent ? parent->pid : pid;
LinuxProcess* lp = (LinuxProcess*) proc;
char subdirname[MAX_NAME+1];
xSnprintf(subdirname, MAX_NAME, "%s/%s/task", dirname, name);
LinuxProcessList_recurseProcTree(this, subdirname, proc, period, tv);
#ifdef HAVE_TASKSTATS
if (settings->flags & PROCESS_FLAG_IO)
LinuxProcessList_readIoFile(lp, dirname, name, now);
#endif
if (! LinuxProcessList_readStatmFile(lp, dirname, name))
goto errorReadingProcess;
proc->show = ! ((hideKernelThreads && Process_isKernelThread(proc)) || (hideUserlandThreads && Process_isUserlandThread(proc)));
char command[MAX_NAME+1];
unsigned long long int lasttimes = (lp->utime + lp->stime);
int commLen = 0;
unsigned int tty_nr = proc->tty_nr;
if (! LinuxProcessList_readStatFile(proc, dirname, name, command, &commLen))
goto errorReadingProcess;
if (tty_nr != proc->tty_nr && this->ttyDrivers) {
free(lp->ttyDevice);
lp->ttyDevice = LinuxProcessList_updateTtyDevice(this->ttyDrivers, proc->tty_nr);
}
if (settings->flags & PROCESS_FLAG_LINUX_IOPRIO)
LinuxProcess_updateIOPriority(lp);
float percent_cpu = (lp->utime + lp->stime - lasttimes) / period * 100.0;
proc->percent_cpu = CLAMP(percent_cpu, 0.0, cpus * 100.0);
if (isnan(proc->percent_cpu)) proc->percent_cpu = 0.0;
proc->percent_mem = (proc->m_resident * PAGE_SIZE_KB) / (double)(pl->totalMem) * 100.0;
if(!preExisting) {
if (! LinuxProcessList_statProcessDir(proc, dirname, name, curTime))
goto errorReadingProcess;
proc->user = UsersTable_getRef(pl->usersTable, proc->st_uid);
#ifdef HAVE_OPENVZ
if (settings->flags & PROCESS_FLAG_LINUX_OPENVZ) {
LinuxProcessList_readOpenVZData(lp, dirname, name);
}
#endif
#ifdef HAVE_VSERVER
if (settings->flags & PROCESS_FLAG_LINUX_VSERVER) {
LinuxProcessList_readVServerData(lp, dirname, name);
}
#endif
if (! LinuxProcessList_readCmdlineFile(proc, dirname, name)) {
goto errorReadingProcess;
}
ProcessList_add(pl, proc);
} else {
if (settings->updateProcessNames && proc->state != 'Z') {
if (! LinuxProcessList_readCmdlineFile(proc, dirname, name)) {
goto errorReadingProcess;
}
}
}
#ifdef HAVE_CGROUP
if (settings->flags & PROCESS_FLAG_LINUX_CGROUP)
LinuxProcessList_readCGroupFile(lp, dirname, name);
#endif
if (settings->flags & PROCESS_FLAG_LINUX_OOM)
LinuxProcessList_readOomData(lp, dirname, name);
if (proc->state == 'Z' && (proc->basenameOffset == 0)) {
proc->basenameOffset = -1;
setCommand(proc, command, commLen);
} else if (Process_isThread(proc)) {
if (settings->showThreadNames || Process_isKernelThread(proc) || (proc->state == 'Z' && proc->basenameOffset == 0)) {
proc->basenameOffset = -1;
setCommand(proc, command, commLen);
} else if (settings->showThreadNames) {
if (! LinuxProcessList_readCmdlineFile(proc, dirname, name))
goto errorReadingProcess;
}
if (Process_isKernelThread(proc)) {
pl->kernelThreads++;
} else {
pl->userlandThreads++;
}
}
pl->totalTasks++;
if (proc->state == 'R')
pl->runningTasks++;
proc->updated = true;
continue;
// Exception handler.
errorReadingProcess: {
if (preExisting) {
ProcessList_remove(pl, proc);
} else {
Process_delete((Object*)proc);
}
}
}
closedir(dir);
return true;
}
static inline void LinuxProcessList_scanMemoryInfo(ProcessList* this) {
unsigned long long int swapFree = 0;
unsigned long long int shmem = 0;
unsigned long long int sreclaimable = 0;
FILE* file = fopen(PROCMEMINFOFILE, "r");
if (file == NULL) {
CRT_fatalError("Cannot open " PROCMEMINFOFILE);
}
char buffer[128];
while (fgets(buffer, 128, file)) {
#define tryRead(label, variable) (String_startsWith(buffer, label) && sscanf(buffer + strlen(label), " %32llu kB", variable))
switch (buffer[0]) {
case 'M':
if (tryRead("MemTotal:", &this->totalMem)) {}
else if (tryRead("MemFree:", &this->freeMem)) {}
else if (tryRead("MemShared:", &this->sharedMem)) {}
break;
case 'B':
if (tryRead("Buffers:", &this->buffersMem)) {}
break;
case 'C':
if (tryRead("Cached:", &this->cachedMem)) {}
break;
case 'S':
switch (buffer[1]) {
case 'w':
if (tryRead("SwapTotal:", &this->totalSwap)) {}
else if (tryRead("SwapFree:", &swapFree)) {}
break;
case 'h':
if (tryRead("Shmem:", &shmem)) {}
break;
case 'R':
if (tryRead("SReclaimable:", &sreclaimable)) {}
break;
}
break;
}
#undef tryRead
}
this->usedMem = this->totalMem - this->freeMem;
this->cachedMem = this->cachedMem + sreclaimable - shmem;
this->usedSwap = this->totalSwap - swapFree;
fclose(file);
}
static inline double LinuxProcessList_scanCPUTime(LinuxProcessList* this) {
FILE* file = fopen(PROCSTATFILE, "r");
if (file == NULL) {
CRT_fatalError("Cannot open " PROCSTATFILE);
}
int cpus = this->super.cpuCount;
assert(cpus > 0);
for (int i = 0; i <= cpus; i++) {
char buffer[PROC_LINE_LENGTH + 1];
unsigned long long int usertime, nicetime, systemtime, idletime;
unsigned long long int ioWait, irq, softIrq, steal, guest, guestnice;
ioWait = irq = softIrq = steal = guest = guestnice = 0;
// Depending on your kernel version,
// 5, 7, 8 or 9 of these fields will be set.
// The rest will remain at zero.
char* ok = fgets(buffer, PROC_LINE_LENGTH, file);
if (!ok) buffer[0] = '\0';
if (i == 0)
sscanf(buffer, "cpu %16llu %16llu %16llu %16llu %16llu %16llu %16llu %16llu %16llu %16llu", &usertime, &nicetime, &systemtime, &idletime, &ioWait, &irq, &softIrq, &steal, &guest, &guestnice);
else {
int cpuid;
sscanf(buffer, "cpu%4d %16llu %16llu %16llu %16llu %16llu %16llu %16llu %16llu %16llu %16llu", &cpuid, &usertime, &nicetime, &systemtime, &idletime, &ioWait, &irq, &softIrq, &steal, &guest, &guestnice);
assert(cpuid == i - 1);
}
// Guest time is already accounted in usertime
usertime = usertime - guest;
nicetime = nicetime - guestnice;
// Fields existing on kernels >= 2.6
// (and RHEL's patched kernel 2.4...)
unsigned long long int idlealltime = idletime + ioWait;
unsigned long long int systemalltime = systemtime + irq + softIrq;
unsigned long long int virtalltime = guest + guestnice;
unsigned long long int totaltime = usertime + nicetime + systemalltime + idlealltime + steal + virtalltime;
CPUData* cpuData = &(this->cpus[i]);
// Since we do a subtraction (usertime - guest) and cputime64_to_clock_t()
// used in /proc/stat rounds down numbers, it can lead to a case where the
// integer overflow.
#define WRAP_SUBTRACT(a,b) (a > b) ? a - b : 0
cpuData->userPeriod = WRAP_SUBTRACT(usertime, cpuData->userTime);
cpuData->nicePeriod = WRAP_SUBTRACT(nicetime, cpuData->niceTime);
cpuData->systemPeriod = WRAP_SUBTRACT(systemtime, cpuData->systemTime);
cpuData->systemAllPeriod = WRAP_SUBTRACT(systemalltime, cpuData->systemAllTime);
cpuData->idleAllPeriod = WRAP_SUBTRACT(idlealltime, cpuData->idleAllTime);
cpuData->idlePeriod = WRAP_SUBTRACT(idletime, cpuData->idleTime);
cpuData->ioWaitPeriod = WRAP_SUBTRACT(ioWait, cpuData->ioWaitTime);
cpuData->irqPeriod = WRAP_SUBTRACT(irq, cpuData->irqTime);
cpuData->softIrqPeriod = WRAP_SUBTRACT(softIrq, cpuData->softIrqTime);
cpuData->stealPeriod = WRAP_SUBTRACT(steal, cpuData->stealTime);
cpuData->guestPeriod = WRAP_SUBTRACT(virtalltime, cpuData->guestTime);
cpuData->totalPeriod = WRAP_SUBTRACT(totaltime, cpuData->totalTime);
#undef WRAP_SUBTRACT
cpuData->userTime = usertime;
cpuData->niceTime = nicetime;
cpuData->systemTime = systemtime;
cpuData->systemAllTime = systemalltime;
cpuData->idleAllTime = idlealltime;
cpuData->idleTime = idletime;
cpuData->ioWaitTime = ioWait;
cpuData->irqTime = irq;
cpuData->softIrqTime = softIrq;
cpuData->stealTime = steal;
cpuData->guestTime = virtalltime;
cpuData->totalTime = totaltime;
}
double period = (double)this->cpus[0].totalPeriod / cpus;
fclose(file);
return period;
}
void ProcessList_goThroughEntries(ProcessList* super) {
LinuxProcessList* this = (LinuxProcessList*) super;
LinuxProcessList_scanMemoryInfo(super);
double period = LinuxProcessList_scanCPUTime(this);
struct timeval tv;
gettimeofday(&tv, NULL);
LinuxProcessList_recurseProcTree(this, PROCDIR, NULL, period, tv);
}
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