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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 "String.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"
#ifndef PROCDIR
#define PROCDIR "/proc"
#endif
#ifndef PROCSTATFILE
#define PROCSTATFILE PROCDIR "/stat"
#endif
#ifndef PROCMEMINFOFILE
#define PROCMEMINFOFILE PROCDIR "/meminfo"
#endif
}*/
ProcessList* ProcessList_new(UsersTable* usersTable, Hashtable* pidWhiteList) {
ProcessList* this = calloc(1, sizeof(ProcessList));
ProcessList_init(this, usersTable, pidWhiteList);
// Update CPU count:
FILE* file = fopen(PROCSTATFILE, "r");
if (file == NULL) {
CRT_fatalError("Cannot open " PROCSTATFILE);
}
char buffer[256];
int cpus = -1;
do {
cpus++;
fgets(buffer, 255, file);
} while (String_startsWith(buffer, "cpu"));
fclose(file);
this->cpuCount = MAX(cpus - 1, 1);
this->cpus = calloc(cpus, sizeof(CPUData));
for (int i = 0; i < cpus; i++) {
this->cpus[i].totalTime = 1;
this->cpus[i].totalPeriod = 1;
}
#ifdef HAVE_OPENVZ
this->flags |= PROCESS_FLAG_OPENVZ;
#endif
return this;
}
void ProcessList_delete(ProcessList* this) {
ProcessList_done(this);
free(this);
}
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 bool LinuxProcessList_readStatFile(Process *process, const char* dirname, const char* name, char* command) {
char filename[MAX_NAME+1];
snprintf(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';
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;
process->cminflt = strtoull(location, &location, 10);
location += 1;
process->majflt = strtoull(location, &location, 10);
location += 1;
process->cmajflt = strtoull(location, &location, 10);
location += 1;
process->utime = strtoull(location, &location, 10);
location += 1;
process->stime = strtoull(location, &location, 10);
location += 1;
process->cutime = strtoull(location, &location, 10);
location += 1;
process->cstime = 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);
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';
snprintf(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(Process* process, const char* dirname, char* name, unsigned long long now) {
char filename[MAX_NAME+1];
filename[MAX_NAME] = '\0';
snprintf(filename, MAX_NAME, "%s/%s/io", dirname, name);
int fd = open(filename, O_RDONLY);
if (fd == -1)
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)
sscanf(line, "syscw: %32llu", &process->io_syscw);
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(Process* process, const char* dirname, const char* name) {
char filename[MAX_NAME+1];
snprintf(filename, MAX_NAME, "%s/%s/statm", dirname, name);
int fd = open(filename, O_RDONLY);
if (fd == -1)
return false;
char buf[256];
ssize_t rres = xread(fd, buf, 255);
close(fd);
if (rres < 1) return false;
char *p = buf;
errno = 0;
process->m_size = strtol(p, &p, 10); if (*p == ' ') p++;
process->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(ProcessList* this, Process* process, const char* dirname, const char* name) {
if ( (!(this->flags & PROCESS_FLAG_OPENVZ)) || (access("/proc/vz", R_OK) != 0)) {
process->vpid = process->pid;
process->ctid = 0;
this->flags |= ~PROCESS_FLAG_OPENVZ;
return;
}
char filename[MAX_NAME+1];
snprintf(filename, MAX_NAME, "%s/%s/stat", dirname, name);
FILE* file = fopen(filename, "r");
if (!file)
return;
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);
}
#endif
#ifdef HAVE_CGROUP
static void LinuxProcessList_readCGroupFile(Process* process, const char* dirname, const char* name) {
char filename[MAX_NAME+1];
snprintf(filename, MAX_NAME, "%s/%s/cgroup", dirname, name);
FILE* file = fopen(filename, "r");
if (!file) {
process->cgroup = strdup("");
return;
}
char output[256];
output[0] = '\0';
char* at = output;
int left = 255;
while (!feof(file) && left > 0) {
char buffer[256];
char *ok = fgets(buffer, 255, 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 = strdup(output);
}
#endif
#ifdef HAVE_VSERVER
static void LinuxProcessList_readVServerData(Process* process, const char* dirname, const char* name) {
char filename[MAX_NAME+1];
snprintf(filename, MAX_NAME, "%s/%s/status", dirname, name);
FILE* file = fopen(filename, "r");
if (!file)
return;
char buffer[256];
process->vxid = 0;
while (fgets(buffer, 255, 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
#ifdef HAVE_OOM
static void LinuxProcessList_readOomData(Process* process, const char* dirname, const char* name) {
char filename[MAX_NAME+1];
snprintf(filename, MAX_NAME, "%s/%s/oom_score", dirname, name);
FILE* file = fopen(filename, "r");
if (!file)
return;
char buffer[256];
if (fgets(buffer, 255, file)) {
unsigned int oom;
int ok = sscanf(buffer, "%32u", &oom);
if (ok >= 1) {
process->oom = oom;
}
}
fclose(file);
}
#endif
static bool LinuxProcessList_readCmdlineFile(Process* process, const char* dirname, const char* name) {
if (Process_isKernelThread(process))
return true;
char filename[MAX_NAME+1];
snprintf(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;
if (amtRead > 0) {
for (int i = 0; i < amtRead; i++)
if (command[i] == '\0' || command[i] == '\n') {
if (tokenEnd == 0) {
tokenEnd = i;
}
command[i] = ' ';
}
}
if (tokenEnd == 0) {
tokenEnd = amtRead;
}
command[amtRead] = '\0';
free(process->comm);
process->comm = strdup(command);
process->basenameOffset = tokenEnd;
return true;
}
static bool LinuxProcessList_processEntries(ProcessList* this, const char* dirname, Process* parent, double period, struct timeval tv) {
DIR* dir;
struct dirent* entry;
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 = this->cpuCount;
bool hideKernelThreads = this->hideKernelThreads;
bool hideUserlandThreads = this->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 ((!this->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;
Process* process = NULL;
Process* existingProcess = (Process*) Hashtable_get(this->processTable, pid);
if (existingProcess) {
assert(Vector_indexOf(this->processes, existingProcess, Process_pidCompare) != -1);
process = existingProcess;
assert(process->pid == pid);
} else {
process = (Process*) LinuxProcess_new(this);
assert(process->comm == NULL);
process->pid = pid;
process->tgid = parent ? parent->pid : pid;
}
char subdirname[MAX_NAME+1];
snprintf(subdirname, MAX_NAME, "%s/%s/task", dirname, name);
LinuxProcessList_processEntries(this, subdirname, process, period, tv);
#ifdef HAVE_TASKSTATS
if (this->flags & PROCESS_FLAG_IO)
LinuxProcessList_readIoFile(process, dirname, name, now);
#endif
if (! LinuxProcessList_readStatmFile(process, dirname, name))
goto errorReadingProcess;
process->show = ! ((hideKernelThreads && Process_isKernelThread(process)) || (hideUserlandThreads && Process_isUserlandThread(process)));
char command[MAX_NAME+1];
unsigned long long int lasttimes = (process->utime + process->stime);
if (! LinuxProcessList_readStatFile(process, dirname, name, command))
goto errorReadingProcess;
if (this->flags & PROCESS_FLAG_IOPRIO)
LinuxProcess_updateIOPriority((LinuxProcess*)process);
float percent_cpu = (process->utime + process->stime - lasttimes) / period * 100.0;
process->percent_cpu = MAX(MIN(percent_cpu, cpus*100.0), 0.0);
if (isnan(process->percent_cpu)) process->percent_cpu = 0.0;
process->percent_mem = (process->m_resident * PAGE_SIZE_KB) / (double)(this->totalMem) * 100.0;
if(!existingProcess) {
if (! LinuxProcessList_statProcessDir(process, dirname, name, curTime))
goto errorReadingProcess;
process->user = UsersTable_getRef(this->usersTable, process->st_uid);
#ifdef HAVE_OPENVZ
LinuxProcessList_readOpenVZData(this, process, dirname, name);
#endif
#ifdef HAVE_VSERVER
if (this->flags & PROCESS_FLAG_VSERVER)
LinuxProcessList_readVServerData(process, dirname, name);
#endif
if (! LinuxProcessList_readCmdlineFile(process, dirname, name))
goto errorReadingProcess;
ProcessList_add(this, process);
} else {
if (this->updateProcessNames) {
if (! LinuxProcessList_readCmdlineFile(process, dirname, name))
goto errorReadingProcess;
}
}
#ifdef HAVE_CGROUP
if (this->flags & PROCESS_FLAG_CGROUP)
LinuxProcessList_readCGroupFile(process, dirname, name);
#endif
#ifdef HAVE_OOM
LinuxProcessList_readOomData(process, dirname, name);
#endif
if (process->state == 'Z') {
free(process->comm);
process->basenameOffset = -1;
process->comm = strdup(command);
} else if (Process_isThread(process)) {
if (this->showThreadNames || Process_isKernelThread(process) || process->state == 'Z') {
free(process->comm);
process->basenameOffset = -1;
process->comm = strdup(command);
} else if (this->showingThreadNames) {
if (! LinuxProcessList_readCmdlineFile(process, dirname, name))
goto errorReadingProcess;
}
if (Process_isKernelThread(process)) {
this->kernelThreads++;
} else {
this->userlandThreads++;
}
}
this->totalTasks++;
if (process->state == 'R')
this->runningTasks++;
process->updated = true;
continue;
// Exception handler.
errorReadingProcess: {
if (process->comm) {
free(process->comm);
process->basenameOffset = -1;
process->comm = NULL;
}
if (existingProcess)
ProcessList_remove(this, process);
else
LinuxProcess_delete((Object*)process);
}
}
closedir(dir);
return true;
}
static inline void LinuxProcessList_scanMemoryInfo(ProcessList* this) {
unsigned long long int swapFree = 0;
FILE* file = fopen(PROCMEMINFOFILE, "r");
if (file == NULL) {
CRT_fatalError("Cannot open " PROCMEMINFOFILE);
}
char buffer[128];
while (fgets(buffer, 128, file)) {
switch (buffer[0]) {
case 'M':
if (String_startsWith(buffer, "MemTotal:"))
sscanf(buffer, "MemTotal: %32llu kB", &this->totalMem);
else if (String_startsWith(buffer, "MemFree:"))
sscanf(buffer, "MemFree: %32llu kB", &this->freeMem);
else if (String_startsWith(buffer, "MemShared:"))
sscanf(buffer, "MemShared: %32llu kB", &this->sharedMem);
break;
case 'B':
if (String_startsWith(buffer, "Buffers:"))
sscanf(buffer, "Buffers: %32llu kB", &this->buffersMem);
break;
case 'C':
if (String_startsWith(buffer, "Cached:"))
sscanf(buffer, "Cached: %32llu kB", &this->cachedMem);
break;
case 'S':
if (String_startsWith(buffer, "SwapTotal:"))
sscanf(buffer, "SwapTotal: %32llu kB", &this->totalSwap);
if (String_startsWith(buffer, "SwapFree:"))
sscanf(buffer, "SwapFree: %32llu kB", &swapFree);
break;
}
}
this->usedMem = this->totalMem - this->freeMem;
this->usedSwap = this->totalSwap - swapFree;
fclose(file);
}
static inline double LinuxProcessList_scanCPUTime(ProcessList* this) {
unsigned long long int usertime, nicetime, systemtime, idletime;
FILE* file = fopen(PROCSTATFILE, "r");
if (file == NULL) {
CRT_fatalError("Cannot open " PROCSTATFILE);
}
int cpus = this->cpuCount;
assert(cpus > 0);
for (int i = 0; i <= cpus; i++) {
char buffer[256];
int cpuid;
unsigned long long int ioWait, irq, softIrq, steal, guest, guestnice;
unsigned long long int systemalltime, idlealltime, totaltime, virtalltime;
ioWait = irq = softIrq = steal = guest = guestnice = 0;
// Dependending on your kernel version,
// 5, 7, 8 or 9 of these fields will be set.
// The rest will remain at zero.
fgets(buffer, 255, file);
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 {
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...)
idlealltime = idletime + ioWait;
systemalltime = systemtime + irq + softIrq;
virtalltime = guest + guestnice;
totaltime = usertime + nicetime + systemalltime + idlealltime + steal + virtalltime;
CPUData* cpuData = &(this->cpus[i]);
assert (usertime >= cpuData->userTime);
assert (nicetime >= cpuData->niceTime);
assert (systemtime >= cpuData->systemTime);
assert (idletime >= cpuData->idleTime);
assert (totaltime >= cpuData->totalTime);
assert (systemalltime >= cpuData->systemAllTime);
assert (idlealltime >= cpuData->idleAllTime);
assert (ioWait >= cpuData->ioWaitTime);
assert (irq >= cpuData->irqTime);
assert (softIrq >= cpuData->softIrqTime);
assert (steal >= cpuData->stealTime);
assert (virtalltime >= cpuData->guestTime);
cpuData->userPeriod = usertime - cpuData->userTime;
cpuData->nicePeriod = nicetime - cpuData->niceTime;
cpuData->systemPeriod = systemtime - cpuData->systemTime;
cpuData->systemAllPeriod = systemalltime - cpuData->systemAllTime;
cpuData->idleAllPeriod = idlealltime - cpuData->idleAllTime;
cpuData->idlePeriod = idletime - cpuData->idleTime;
cpuData->ioWaitPeriod = ioWait - cpuData->ioWaitTime;
cpuData->irqPeriod = irq - cpuData->irqTime;
cpuData->softIrqPeriod = softIrq - cpuData->softIrqTime;
cpuData->stealPeriod = steal - cpuData->stealTime;
cpuData->guestPeriod = virtalltime - cpuData->guestTime;
cpuData->totalPeriod = totaltime - cpuData->totalTime;
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_scan(ProcessList* this) {
LinuxProcessList_scanMemoryInfo(this);
double period = LinuxProcessList_scanCPUTime(this);
// mark all process as "dirty"
for (int i = 0; i < Vector_size(this->processes); i++) {
Process* p = (Process*) Vector_get(this->processes, i);
p->updated = false;
}
this->totalTasks = 0;
this->userlandThreads = 0;
this->kernelThreads = 0;
this->runningTasks = 0;
struct timeval tv;
gettimeofday(&tv, NULL);
LinuxProcessList_processEntries(this, PROCDIR, NULL, period, tv);
this->showingThreadNames = this->showThreadNames;
for (int i = Vector_size(this->processes) - 1; i >= 0; i--) {
Process* p = (Process*) Vector_get(this->processes, i);
if (p->updated == false)
ProcessList_remove(this, p);
else
p->updated = false;
}
}
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