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htop/linux/LinuxProcessList.c

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/*
htop - LinuxProcessList.c
(C) 2014 Hisham H. Muhammad
Released under the GNU GPLv2, 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>
#ifdef MAJOR_IN_MKDEV
#include <sys/mkdev.h>
#elif defined(MAJOR_IN_SYSMACROS)
#include <sys/sysmacros.h>
#endif
#ifdef HAVE_DELAYACCT
#include <netlink/attr.h>
#include <netlink/netlink.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/ctrl.h>
#include <netlink/socket.h>
#include <netlink/msg.h>
#include <linux/taskstats.h>
#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) {
const TtyDriver* a = (const TtyDriver*) va;
const TtyDriver* b = (const TtyDriver*) vb;
return (a->major == b->major) ? ((int)a->minorFrom - (int)b->minorFrom) : ((int)a->major - (int)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 = xRealloc(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 = xMalloc(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 = xStrdup(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 = xRealloc(ttyDrivers, sizeof(TtyDriver) * allocd);
}
}
free(buf);
numDrivers++;
ttyDrivers = xRealloc(ttyDrivers, sizeof(TtyDriver) * numDrivers);
ttyDrivers[numDrivers - 1].path = NULL;
qsort(ttyDrivers, numDrivers - 1, sizeof(TtyDriver), sortTtyDrivers);
this->ttyDrivers = ttyDrivers;
}
#ifdef HAVE_DELAYACCT
static void LinuxProcessList_initNetlinkSocket(LinuxProcessList* this) {
this->netlink_socket = nl_socket_alloc();
if (this->netlink_socket == NULL) {
return;
}
if (nl_connect(this->netlink_socket, NETLINK_GENERIC) < 0) {
return;
}
this->netlink_family = genl_ctrl_resolve(this->netlink_socket, TASKSTATS_GENL_NAME);
}
#endif
ProcessList* ProcessList_new(UsersTable* usersTable, Hashtable* pidMatchList, uid_t userId) {
LinuxProcessList* this = xCalloc(1, sizeof(LinuxProcessList));
ProcessList* pl = &(this->super);
ProcessList_init(pl, Class(LinuxProcess), usersTable, pidMatchList, userId);
LinuxProcessList_initTtyDrivers(this);
#ifdef HAVE_DELAYACCT
LinuxProcessList_initNetlinkSocket(this);
#endif
// Check for /proc/*/smaps_rollup availability (improves smaps parsing speed, Linux 4.14+)
FILE* file = fopen(PROCDIR "/self/smaps_rollup", "r");
if(file != NULL) {
this->haveSmapsRollup = true;
fclose(file);
} else {
this->haveSmapsRollup = false;
}
// Update CPU count:
file = fopen(PROCSTATFILE, "r");
if (file == NULL) {
CRT_fatalError("Cannot open " PROCSTATFILE);
}
int cpus = 0;
do {
char buffer[PROC_LINE_LENGTH + 1];
if (fgets(buffer, PROC_LINE_LENGTH + 1, file) == NULL) {
CRT_fatalError("No btime in " PROCSTATFILE);
} else if (String_startsWith(buffer, "cpu")) {
cpus++;
} else if (String_startsWith(buffer, "btime ")) {
if (sscanf(buffer, "btime %lld\n", &btime) != 1)
CRT_fatalError("Failed to parse btime from " PROCSTATFILE);
break;
}
} while(true);
fclose(file);
pl->cpuCount = MAXIMUM(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);
}
#ifdef HAVE_DELAYACCT
if (this->netlink_socket) {
nl_close(this->netlink_socket);
nl_socket_free(this->netlink_socket);
}
#endif
free(this);
}
static double jiffy = NAN;
static inline unsigned long long LinuxProcess_adjustTime(unsigned long long t) {
if(isnan(jiffy)) {
errno = 0;
long sc_jiffy = sysconf(_SC_CLK_TCK);
if(errno || -1 == sc_jiffy) {
jiffy = NAN;
return t; // Assume 100Hz clock
}
jiffy = sc_jiffy;
}
double jiffytime = 1.0 / jiffy;
return t * jiffytime * 100;
}
static bool LinuxProcessList_readStatFile(Process *process, const char* dirname, const char* name, char* command, int* commLen) {
LinuxProcess* lp = (LinuxProcess*) process;
const int commLenIn = *commLen;
*commLen = 0;
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 = MINIMUM(end - location, commLenIn - 1);
// deepcode ignore BufferOverflow: commsize is bounded by the allocated length passed in by commLen, saved into commLenIn
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;
location = strchr(location, ' ')+1;
lp->starttime = strtoll(location, &location, 10);
location += 1;
for (int i=0; i<15; 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) {
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;
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 = NAN;
process->io_rate_write_bps = NAN;
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[4] == '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, sizeof(filename), "%s/%s/statm", dirname, name);
FILE* statmfile = fopen(filename, "r");
if (!statmfile)
return false;
int r = fscanf(statmfile, "%ld %ld %ld %ld %ld %ld %ld",
&process->super.m_size,
&process->super.m_resident,
&process->m_share,
&process->m_trs,
&process->m_lrs,
&process->m_drs,
&process->m_dt);
fclose(statmfile);
return r == 7;
}
static bool LinuxProcessList_readSmapsFile(LinuxProcess* process, const char* dirname, const char* name, bool haveSmapsRollup) {
//http://elixir.free-electrons.com/linux/v4.10/source/fs/proc/task_mmu.c#L719
//kernel will return data in chunks of size PAGE_SIZE or less.
char buffer[PAGE_SIZE];// 4k
char *start,*end;
ssize_t nread=0;
int tmp=0;
if(haveSmapsRollup) {// only available in Linux 4.14+
snprintf(buffer, PAGE_SIZE-1, "%s/%s/smaps_rollup", dirname, name);
} else {
snprintf(buffer, PAGE_SIZE-1, "%s/%s/smaps", dirname, name);
}
int fd = open(buffer, O_RDONLY);
if (fd == -1)
return false;
process->m_pss = 0;
process->m_swap = 0;
process->m_psswp = 0;
while ( ( nread = read(fd,buffer, sizeof(buffer)) ) > 0 ){
start = (char *)&buffer;
end = start + nread;
do{//parse 4k block
if( (tmp = (end - start)) > 0 &&
(start = memmem(start,tmp,"\nPss:",5)) != NULL )
{
process->m_pss += strtol(start+5, &start, 10);
start += 3;//now we must be at the end of line "Pss: 0 kB"
}else
break; //read next 4k block
if( (tmp = (end - start)) > 0 &&
(start = memmem(start,tmp,"\nSwap:",6)) != NULL )
{
process->m_swap += strtol(start+6, &start, 10);
start += 3;
}else
break;
if( (tmp = (end - start)) > 0 &&
(start = memmem(start,tmp,"\nSwapPss:",9)) != NULL )
{
process->m_psswp += strtol(start+9, &start, 10);
start += 3;
}else
break;
}while(1);
}//while read
close(fd);
return true;
}
#ifdef HAVE_OPENVZ
static void LinuxProcessList_readOpenVZData(LinuxProcess* process, const char* dirname, const char* name) {
if ( (access(PROCDIR "/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);
}
#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) {
if (process->cgroup) {
free(process->cgroup);
process->cgroup = NULL;
}
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, "%u", &oom);
if (ok >= 1) {
process->oom = oom;
}
}
fclose(file);
}
static void LinuxProcessList_readCtxtData(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];
unsigned long ctxt = 0;
while (fgets(buffer, PROC_LINE_LENGTH, file)) {
if (String_startsWith(buffer, "voluntary_ctxt_switches:")) {
unsigned long vctxt;
int ok = sscanf(buffer, "voluntary_ctxt_switches:\t%lu", &vctxt);
if (ok >= 1)
ctxt += vctxt;
} else if (String_startsWith(buffer, "nonvoluntary_ctxt_switches:")) {
unsigned long nvctxt;
int ok = sscanf(buffer, "nonvoluntary_ctxt_switches:\t%lu", &nvctxt);
if (ok >= 1)
ctxt += nvctxt;
}
}
fclose(file);
process->ctxt_diff = (ctxt > process->ctxt_total) ? (ctxt - process->ctxt_total) : 0;
process->ctxt_total = ctxt;
}
static void LinuxProcessList_readSecattrData(LinuxProcess* process, const char* dirname, const char* name) {
char filename[MAX_NAME+1];
xSnprintf(filename, sizeof(filename), "%s/%s/attr/current", dirname, name);
FILE* file = fopen(filename, "r");
if (!file) {
free(process->secattr);
process->secattr = NULL;
return;
}
char buffer[PROC_LINE_LENGTH + 1];
char *res = fgets(buffer, sizeof(buffer), file);
fclose(file);
if (!res) {
free(process->secattr);
process->secattr = NULL;
return;
}
char *newline = strchr(buffer, '\n');
if (newline)
*newline = '\0';
if (process->secattr && 0 == strcmp(process->secattr, buffer))
return;
free(process->secattr);
process->secattr = xStrdup(buffer);
}
#ifdef HAVE_DELAYACCT
static int handleNetlinkMsg(struct nl_msg *nlmsg, void *linuxProcess) {
struct nlmsghdr *nlhdr;
struct nlattr *nlattrs[TASKSTATS_TYPE_MAX + 1];
struct nlattr *nlattr;
struct taskstats *stats;
int rem;
unsigned long long int timeDelta;
LinuxProcess* lp = (LinuxProcess*) linuxProcess;
nlhdr = nlmsg_hdr(nlmsg);
if (genlmsg_parse(nlhdr, 0, nlattrs, TASKSTATS_TYPE_MAX, NULL) < 0) {
return NL_SKIP;
}
if ((nlattr = nlattrs[TASKSTATS_TYPE_AGGR_PID]) || (nlattr = nlattrs[TASKSTATS_TYPE_NULL])) {
stats = nla_data(nla_next(nla_data(nlattr), &rem));
assert(lp->super.pid == (pid_t)stats->ac_pid);
timeDelta = (stats->ac_etime*1000 - lp->delay_read_time);
#define BOUNDS(x) isnan(x) ? 0.0 : (x > 100) ? 100.0 : x;
#define DELTAPERC(x,y) BOUNDS((float) (x - y) / timeDelta * 100);
lp->cpu_delay_percent = DELTAPERC(stats->cpu_delay_total, lp->cpu_delay_total);
lp->blkio_delay_percent = DELTAPERC(stats->blkio_delay_total, lp->blkio_delay_total);
lp->swapin_delay_percent = DELTAPERC(stats->swapin_delay_total, lp->swapin_delay_total);
#undef DELTAPERC
#undef BOUNDS
lp->swapin_delay_total = stats->swapin_delay_total;
lp->blkio_delay_total = stats->blkio_delay_total;
lp->cpu_delay_total = stats->cpu_delay_total;
lp->delay_read_time = stats->ac_etime*1000;
}
return NL_OK;
}
static void LinuxProcessList_readDelayAcctData(LinuxProcessList* this, LinuxProcess* process) {
struct nl_msg *msg;
if (nl_socket_modify_cb(this->netlink_socket, NL_CB_VALID, NL_CB_CUSTOM, handleNetlinkMsg, process) < 0) {
return;
}
if (! (msg = nlmsg_alloc())) {
return;
}
if (! genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ, this->netlink_family, 0, NLM_F_REQUEST, TASKSTATS_CMD_GET, TASKSTATS_VERSION)) {
nlmsg_free(msg);
}
if (nla_put_u32(msg, TASKSTATS_CMD_ATTR_PID, process->super.pid) < 0) {
nlmsg_free(msg);
}
if (nl_send_sync(this->netlink_socket, msg) < 0) {
process->swapin_delay_percent = NAN;
process->blkio_delay_percent = NAN;
process->cpu_delay_percent = NAN;
return;
}
if (nl_recvmsgs_default(this->netlink_socket) < 0) {
return;
}
}
#endif
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) {
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) {
if (process->state == 'Z') {
process->basenameOffset = 0;
} else {
((LinuxProcess*)process)->isKernelThread = true;
}
return true;
} else 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 + 1);
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(;;) {
xAsprintf(&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);
xAsprintf(&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 xStrdup(ttyDrivers[i].path);
}
char* out;
xAsprintf(&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;
#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;
if ((settings->flags & PROCESS_FLAG_LINUX_SMAPS) && !Process_isKernelThread(proc)){
if (!parent){
// Read smaps file of each process only every second pass to improve performance
static int smaps_flag = 0;
if ((pid & 1) == smaps_flag){
LinuxProcessList_readSmapsFile(lp, dirname, name, this->haveSmapsRollup);
}
if (pid == 1) {
smaps_flag = !smaps_flag;
}
} else {
lp->m_pss = ((LinuxProcess*)parent)->m_pss;
}
}
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 = sizeof(command);
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))
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_DELAYACCT
LinuxProcessList_readDelayAcctData(this, lp);
#endif
#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 (settings->flags & PROCESS_FLAG_LINUX_CTXT)
LinuxProcessList_readCtxtData(lp, dirname, name);
if (settings->flags & PROCESS_FLAG_LINUX_SECATTR)
LinuxProcessList_readSecattrData(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) do { if (String_startsWith(buffer, label) && sscanf(buffer + strlen(label), " %32llu kB", variable)) { break; } } while(0)
switch (buffer[0]) {
case 'M':
tryRead("MemTotal:", &this->totalMem);
tryRead("MemFree:", &this->freeMem);
tryRead("MemShared:", &this->sharedMem);
break;
case 'B':
tryRead("Buffers:", &this->buffersMem);
break;
case 'C':
tryRead("Cached:", &this->cachedMem);
break;
case 'S':
switch (buffer[1]) {
case 'w':
tryRead("SwapTotal:", &this->totalSwap);
tryRead("SwapFree:", &swapFree);
break;
case 'h':
tryRead("Shmem:", &shmem);
break;
case 'R':
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 void LinuxProcessList_scanZfsArcstats(LinuxProcessList* lpl) {
unsigned long long int dbufSize = 0;
unsigned long long int dnodeSize = 0;
unsigned long long int bonusSize = 0;
FILE* file = fopen(PROCARCSTATSFILE, "r");
if (file == NULL) {
lpl->zfs.enabled = 0;
return;
}
char buffer[128];
while (fgets(buffer, 128, file)) {
#define tryRead(label, variable) do { if (String_startsWith(buffer, label) && sscanf(buffer + strlen(label), " %*2u %32llu", variable)) { break; } } while(0)
#define tryReadFlag(label, variable, flag) do { if (String_startsWith(buffer, label) && sscanf(buffer + strlen(label), " %*2u %32llu", variable)) { flag = 1; break; } else { flag = 0; } } while(0)
switch (buffer[0]) {
case 'c':
tryRead("c_max", &lpl->zfs.max);
tryReadFlag("compressed_size", &lpl->zfs.compressed, lpl->zfs.isCompressed);
break;
case 'u':
tryRead("uncompressed_size", &lpl->zfs.uncompressed);
break;
case 's':
tryRead("size", &lpl->zfs.size);
break;
case 'h':
tryRead("hdr_size", &lpl->zfs.header);
break;
case 'd':
tryRead("dbuf_size", &dbufSize);
tryRead("dnode_size", &dnodeSize);
break;
case 'b':
tryRead("bonus_size", &bonusSize);
break;
case 'a':
tryRead("anon_size", &lpl->zfs.anon);
break;
case 'm':
tryRead("mfu_size", &lpl->zfs.MFU);
tryRead("mru_size", &lpl->zfs.MRU);
break;
}
#undef tryRead
#undef tryReadFlag
}
fclose(file);
lpl->zfs.enabled = (lpl->zfs.size > 0 ? 1 : 0);
lpl->zfs.size /= 1024;
lpl->zfs.max /= 1024;
lpl->zfs.MFU /= 1024;
lpl->zfs.MRU /= 1024;
lpl->zfs.anon /= 1024;
lpl->zfs.header /= 1024;
lpl->zfs.other = (dbufSize + dnodeSize + bonusSize) / 1024;
if ( lpl->zfs.isCompressed ) {
lpl->zfs.compressed /= 1024;
lpl->zfs.uncompressed /= 1024;
}
}
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)
(void) 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;
(void) 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;
}
static int scanCPUFreqencyFromSysCPUFreq(LinuxProcessList* this) {
int cpus = this->super.cpuCount;
int numCPUsWithFrequency = 0;
unsigned long totalFrequency = 0;
for (int i = 0; i < cpus; ++i) {
char pathBuffer[64];
xSnprintf(pathBuffer, sizeof(pathBuffer), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_cur_freq", i);
FILE* file = fopen(pathBuffer, "r");
if (!file)
return -errno;
unsigned long frequency;
if (fscanf(file, "%lu", &frequency) == 1) {
/* convert kHz to MHz */
frequency = frequency / 1000;
this->cpus[i + 1].frequency = frequency;
numCPUsWithFrequency++;
totalFrequency += frequency;
}
fclose(file);
}
if (numCPUsWithFrequency > 0)
this->cpus[0].frequency = (double)totalFrequency / numCPUsWithFrequency;
return 0;
}
static void scanCPUFreqencyFromCPUinfo(LinuxProcessList* this) {
FILE* file = fopen(PROCCPUINFOFILE, "r");
if (file == NULL)
return;
int cpus = this->super.cpuCount;
int numCPUsWithFrequency = 0;
double totalFrequency = 0;
int cpuid = -1;
while (!feof(file)) {
double frequency;
char buffer[PROC_LINE_LENGTH];
if (fgets(buffer, PROC_LINE_LENGTH, file) == NULL)
break;
if (
(sscanf(buffer, "processor : %d", &cpuid) == 1) ||
(sscanf(buffer, "processor: %d", &cpuid) == 1)
) {
continue;
} else if (
(sscanf(buffer, "cpu MHz : %lf", &frequency) == 1) ||
(sscanf(buffer, "cpu MHz: %lf", &frequency) == 1)
) {
if (cpuid < 0 || cpuid > (cpus - 1))
continue;
CPUData* cpuData = &(this->cpus[cpuid + 1]);
/* do not override sysfs data */
if (isnan(cpuData->frequency))
cpuData->frequency = frequency;
numCPUsWithFrequency++;
totalFrequency += frequency;
} else if (buffer[0] == '\n') {
cpuid = -1;
}
}
fclose(file);
if (numCPUsWithFrequency > 0)
this->cpus[0].frequency = totalFrequency / numCPUsWithFrequency;
}
static void LinuxProcessList_scanCPUFrequency(LinuxProcessList* this) {
int cpus = this->super.cpuCount;
assert(cpus > 0);
for (int i = 0; i <= cpus; i++)
this->cpus[i].frequency = NAN;
if (scanCPUFreqencyFromSysCPUFreq(this) == 0)
return;
scanCPUFreqencyFromCPUinfo(this);
}
void ProcessList_goThroughEntries(ProcessList* super) {
LinuxProcessList* this = (LinuxProcessList*) super;
const Settings* settings = super->settings;
LinuxProcessList_scanMemoryInfo(super);
LinuxProcessList_scanZfsArcstats(this);
double period = LinuxProcessList_scanCPUTime(this);
if (settings->showCPUFrequency)
LinuxProcessList_scanCPUFrequency(this);
struct timeval tv;
gettimeofday(&tv, NULL);
LinuxProcessList_recurseProcTree(this, PROCDIR, NULL, period, tv);
}
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