/
pidstat.c
2879 lines (2493 loc) · 74.3 KB
/
pidstat.c
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/*
* pidstat: Report statistics for Linux tasks
* (C) 2007-2024 by Sebastien GODARD (sysstat <at> orange.fr)
*
***************************************************************************
* This program is free software; you can redistribute it and/or modify it *
* under the terms of the GNU General Public License as published by the *
* Free Software Foundation; either version 2 of the License, or (at your *
* option) any later version. *
* *
* This program is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without the implied warranty of MERCHANTABILITY *
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
* for more details. *
* *
* You should have received a copy of the GNU General Public License along *
* with this program; if not, write to the Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA *
***************************************************************************
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <dirent.h>
#include <ctype.h>
#include <sys/types.h>
#include <pwd.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <regex.h>
#ifdef HAVE_LINUX_SCHED_H
#include <linux/sched.h>
#endif
#include "version.h"
#include "pidstat.h"
#include "rd_stats.h"
#include "count.h"
#ifdef USE_NLS
#include <locale.h>
#include <libintl.h>
#define _(string) gettext(string)
#else
#define _(string) (string)
#endif
#ifdef USE_SCCSID
#define SCCSID "@(#)sysstat-" VERSION ": " __FILE__ " compiled " __DATE__ " " __TIME__
char *sccsid(void) { return (SCCSID); }
#endif
#ifdef TEST
extern int __env;
#endif
unsigned long long tot_jiffies[3] = {0, 0, 0};
unsigned long long uptime_cs[3] = {0, 0, 0};
struct st_pid *pid_list = NULL;
struct tm ps_tstamp[3];
char commstr[MAX_COMM_LEN];
char userstr[MAX_USER_LEN];
char procstr[MAX_COMM_LEN];
int cpu_nr = 0; /* Nb of processors on the machine */
unsigned long tlmkb; /* Total memory in kB */
long interval = -1;
long count = 0;
unsigned int pidflag = 0; /* General flags */
unsigned int tskflag = 0; /* TASK/CHILD stats */
unsigned int actflag = 0; /* Activity flag */
struct sigaction alrm_act, int_act, chld_act;
int signal_caught = 0;
int status = 0;
int dplaces_nr = -1; /* Number of decimal places */
/*
***************************************************************************
* Print usage and exit.
*
* IN:
* @progname Name of sysstat command
***************************************************************************
*/
void usage(char *progname)
{
fprintf(stderr, _("Usage: %s [ options ] [ <interval> [ <count> ] ] [ -e <program> <args> ]\n"),
progname);
fprintf(stderr, _("Options are:\n"
"[ -d ] [ -H ] [ -h ] [ -I ] [ -l ] [ -R ] [ -r ] [ -s ] [ -t ] [ -U [ <username> ] ]\n"
"[ -u ] [ -V ] [ -v ] [ -w ] [ -C <command> ] [ -G <process_name> ]\n"
"[ -p { <pid> [,...] | SELF | ALL } ] [ -T { TASK | CHILD | ALL } ]\n"
"[ --dec={ 0 | 1 | 2 } ] [ --human ]\n"));
exit(1);
}
/*
***************************************************************************
* SIGALRM signal handler. No need to reset the handler here.
*
* IN:
* @sig Signal number.
***************************************************************************
*/
void alarm_handler(int sig)
{
alarm(interval);
}
/*
***************************************************************************
* SIGINT and SIGCHLD signals handler.
*
* IN:
* @sig Signal number.
***************************************************************************
*/
void int_handler(int sig)
{
int status_code;
signal_caught = TRUE;
if (sig == SIGCHLD) {
/*
* SIGCHLD tells the parent process that it can now
* get the exit status of the child via wait().
*/
wait(&status_code);
status = WEXITSTATUS(status_code);
}
}
/*
***************************************************************************
* Free unused PID structures.
*
* IN
* @plist Pointer address on the start of the linked list.
* @force Set to TRUE if all PID structures shall be freed.
***************************************************************************
*/
void sfree_pid(struct st_pid **plist, int force)
{
int i;
struct st_pid *p;
while (*plist != NULL) {
p = *plist;
if (!p->exist || force) {
*plist = p->next;
for (i = 0; i < 3; i++) {
if (p->pstats[i]) {
free(p->pstats[i]);
}
}
free(p);
}
else {
plist = &(p->next);
}
}
}
/*
***************************************************************************
* Set every PID in list to nonexistent status.
*
* IN:
* @plist Pointer on the start of the linked list.
***************************************************************************
*/
void set_pid_nonexistent(struct st_pid *plist)
{
while (plist != NULL) {
plist->exist = FALSE;
plist = plist->next;
}
}
/*
***************************************************************************
* Check flags and set default values.
***************************************************************************
*/
void check_flags(void)
{
unsigned int act = 0;
/* Display CPU usage for active tasks by default */
if (!actflag) {
actflag |= P_A_CPU;
}
if (!DISPLAY_PID(pidflag)) {
/*
* If no PIDs nor -p ALL entered on the command line then
* only active PIDs will be displayed.
*/
pidflag |= P_D_ACTIVE_PID + P_D_ALL_PID;
}
if (!tskflag) {
tskflag |= P_TASK;
}
/* Check that requested activities are available */
if (DISPLAY_TASK_STATS(tskflag)) {
act |= P_A_CPU + P_A_MEM + P_A_IO + P_A_CTXSW
+ P_A_STACK + P_A_KTAB + P_A_RT;
}
if (DISPLAY_CHILD_STATS(tskflag)) {
act |= P_A_CPU + P_A_MEM;
}
actflag &= act;
if (!actflag) {
fprintf(stderr, _("Requested activities not available\n"));
exit(1);
}
}
/*
***************************************************************************
* Look for the PID in the list and store it if necessary.
* PID -> PID -> TGID -> TID -> TID -> TID -> PID -> NULL
* Eg.: 1234 -> 1289 -> 1356 -> 1356 -> 1361 -> 4678 -> 1376 -> NULL
*
* IN:
* @plist Pointer address on the start of the linked list.
* @pid PID number.
* @tgid If PID is a TID then @tgid is its TGID number. 0 otherwise.
*
* RETURNS:
* Pointer on the st_pid structure in the list where the PID is located
* (whether it was already in the list or if it has been added).
* NULL if the PID is 0 or it is a TID and its TGID has not been found in
* list.
***************************************************************************
*/
struct st_pid *add_list_pid(struct st_pid **plist, pid_t pid, pid_t tgid)
{
struct st_pid *p, *ps, *tgid_p = NULL;
int i;
if (!pid)
return NULL;
if (!tgid) {
/*
* Add a true PID to the list.
* Add it in ascending order, not taking into account
* other TIDs.
*/
while (*plist != NULL) {
p = *plist;
if (!p->tgid && (p->pid == pid))
/* PID found in list */
return p;
if (!p->tgid && (p->pid > pid))
/* Stop now to insert PID in list */
break;
plist = &(p->next);
}
}
else {
int tgid_found = FALSE;
/*
* PID is a TID.
* It will be inserted in ascending order immediately
* following its TGID.
*/
while (*plist != NULL) {
p = *plist;
if (p->pid == tgid) {
/* TGID found in list */
tgid_found = TRUE;
tgid_p = p;
break;
}
plist = &(p->next);
}
if (!tgid_found)
/* TGID not found: Stop now */
return NULL;
plist = &(p->next);
while (*plist != NULL) {
p = *plist;
if ((p->tgid == tgid_p) && (p->pid == pid))
/* TID found in list */
return p;
if ((p->tgid == tgid_p) && (p->pid > pid))
/* Stop now to insert TID in list */
break;
if (p->tgid != tgid_p)
/* End of TID list: insert TID here */
break;
plist = &(p->next);
}
}
/* PID not found */
ps = *plist;
/* Add PID to the list */
if ((*plist = (struct st_pid *) malloc(sizeof(struct st_pid))) == NULL) {
perror("malloc");
exit(4);
}
memset(*plist, 0, sizeof(struct st_pid));
p = *plist;
for (i = 0; i < 3; i++) {
if ((p->pstats[i] = (struct pid_stats *) malloc(sizeof(struct pid_stats))) == NULL) {
perror("malloc");
exit(4);
}
memset(p->pstats[i], 0, PID_STATS_SIZE);
}
p->pid = pid;
p->next = ps;
if (tgid_p) {
p->tgid = tgid_p;
}
return p;
}
/*
***************************************************************************
* Get pointer on task's command string.
* If this is a thread then return the short command name so that threads
* can still be identified.
*
* IN:
* @plist Pointer address on the start of the linked list.
***************************************************************************
*/
char *get_tcmd(struct st_pid *plist)
{
if (DISPLAY_CMDLINE(pidflag) && strlen(plist->cmdline) && !plist->tgid)
/* Option "-l" used */
return plist->cmdline;
else
return plist->comm;
}
/*
***************************************************************************
* Display process command name or command line.
*
* IN:
* @plist Pointer address on the start of the linked list.
***************************************************************************
*/
void print_comm(struct st_pid *plist)
{
char *p;
/* Get pointer on task's command string */
p = get_tcmd(plist);
if (plist->tgid) {
if (IS_PID_DISPLAYED(plist->tgid->flags)) {
cprintf_s(IS_ZERO, " |__%s\n", p);
}
else {
/* Its TGID has not been displayed */
cprintf_s(IS_STR, " (%s)", plist->tgid->comm);
cprintf_s(IS_ZERO, "__%s\n", p);
/* We can now consider this has been the case */
plist->tgid->flags |= F_PID_DISPLAYED;
}
}
else {
cprintf_s(IS_STR, " %s\n", p);
}
}
/*
***************************************************************************
* Read /proc/meminfo.
***************************************************************************
*/
void read_proc_meminfo(void)
{
struct stats_memory st_mem;
memset(&st_mem, 0, STATS_MEMORY_SIZE);
read_meminfo(&st_mem);
tlmkb = st_mem.tlmkb;
}
/*
***************************************************************************
* Read stats from /proc/#[/task/##]/stat.
*
* IN:
* @pid Process whose stats are to be read.
* @plist Pointer on the linked list where PID is saved.
* @tgid If !=0, thread whose stats are to be read.
* @curr Index in array for current sample statistics.
*
* OUT:
* @thread_nr Number of threads of the process.
*
* RETURNS:
* 0 if stats have been successfully read, and 1 otherwise.
***************************************************************************
*/
int read_proc_pid_stat(pid_t pid, struct st_pid *plist,
unsigned int *thread_nr, pid_t tgid, int curr)
{
int fd, sz, rc, commsz;
char filename[128];
static char buffer[1024 + 1];
char *start, *end;
struct pid_stats *pst = plist->pstats[curr];
if (tgid) {
sprintf(filename, TASK_STAT, tgid, pid);
}
else {
sprintf(filename, PID_STAT, pid);
}
if ((fd = open(filename, O_RDONLY)) < 0)
/* No such process */
return 1;
sz = read(fd, buffer, 1024);
close(fd);
if (sz <= 0)
return 1;
buffer[sz] = '\0';
if ((start = strchr(buffer, '(')) == NULL)
return 1;
start += 1;
if ((end = strrchr(start, ')')) == NULL)
return 1;
commsz = end - start;
if (commsz >= MAX_COMM_LEN)
return 1;
memcpy(plist->comm, start, commsz);
plist->comm[commsz] = '\0';
start = end + 2;
rc = sscanf(start,
"%*s %*d %*d %*d %*d %*d %*u %llu %llu"
" %llu %llu %llu %llu %lld %lld %*d %*d %u %*u %*d %llu %llu"
" %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u"
" %*u %u %u %u %llu %llu %lld\n",
&pst->minflt, &pst->cminflt, &pst->majflt, &pst->cmajflt,
&pst->utime, &pst->stime, &pst->cutime, &pst->cstime,
thread_nr, &pst->vsz, &pst->rss, &pst->processor,
&pst->priority, &pst->policy,
&pst->blkio_swapin_delays, &pst->gtime, &pst->cgtime);
if (rc < 15)
return 1;
if (rc < 17) {
/* gtime and cgtime fields are unavailable in file */
pst->gtime = pst->cgtime = 0;
}
/* Convert to kB */
pst->vsz >>= 10;
pst->rss = PG_TO_KB(pst->rss);
return 0;
}
/*
***************************************************************************
* Read stats from /proc/#[/task/##]/schedstat.
*
* IN:
* @pid Process whose stats are to be read.
* @plist Pointer on the linked list where PID is saved.
* @tgid If != 0, thread whose stats are to be read.
* @curr Index in array for current sample statistics.
*
* RETURNS:
* 0 if stats have been successfully read, and 1 otherwise.
***************************************************************************
*/
int read_proc_pid_sched(pid_t pid, struct st_pid *plist, pid_t tgid, int curr)
{
int fd, rc = 0;
char filename[128];
static char buffer[1024 + 1];
unsigned long long wtime = 0;
struct pid_stats *pst = plist->pstats[curr];
if (tgid) {
sprintf(filename, TASK_SCHED, tgid, pid);
}
else {
sprintf(filename, PID_SCHED, pid);
}
if ((fd = open(filename, O_RDONLY)) >= 0) {
int sz;
/* schedstat file found for process */
sz = read(fd, buffer, 1024);
close(fd);
if (sz > 0) {
buffer[sz] = '\0';
rc = sscanf(buffer, "%*u %llu %*d\n", &wtime);
}
}
/* Convert ns to jiffies */
pst->wtime = wtime * HZ / 1000000000;
if (rc < 1)
return 1;
return 0;
}
/*
*****************************************************************************
* Read stats from /proc/#[/task/##]/status.
*
* IN:
* @pid Process whose stats are to be read.
* @plist Pointer on the linked list where PID is saved.
* @tgid If != 0, thread whose stats are to be read.
* @curr Index in array for current sample statistics.
*
* RETURNS:
* 0 if stats have been successfully read, and 1 otherwise.
*****************************************************************************
*/
int read_proc_pid_status(pid_t pid, struct st_pid *plist, pid_t tgid, int curr)
{
FILE *fp;
char filename[128], line[256];
struct pid_stats *pst = plist->pstats[curr];
if (tgid) {
sprintf(filename, TASK_STATUS, tgid, pid);
}
else {
sprintf(filename, PID_STATUS, pid);
}
if ((fp = fopen(filename, "r")) == NULL)
/* No such process */
return 1;
while (fgets(line, sizeof(line), fp) != NULL) {
if (!strncmp(line, "Uid:", 4)) {
sscanf(line + 5, "%u", &plist->uid);
}
else if (!strncmp(line, "Threads:", 8)) {
sscanf(line + 9, "%u", &pst->threads);
}
else if (!strncmp(line, "voluntary_ctxt_switches:", 24)) {
sscanf(line + 25, "%lu", &pst->nvcsw);
}
else if (!strncmp(line, "nonvoluntary_ctxt_switches:", 27)) {
sscanf(line + 28, "%lu", &pst->nivcsw);
}
}
fclose(fp);
return 0;
}
/*
*****************************************************************************
* Read information from /proc/#[/task/##}/smaps.
*
* @pid Process whose stats are to be read.
* @plist Pointer on the linked list where PID is saved.
* @tgid If != 0, thread whose stats are to be read.
* @curr Index in array for current sample statistics.
*
* RETURNS:
* 0 if stats have been successfully read, and 1 otherwise.
*****************************************************************************
*/
int read_proc_pid_smap(pid_t pid, struct st_pid *plist, pid_t tgid, int curr)
{
FILE *fp;
char filename[128], line[256];
int state = 0;
struct pid_stats *pst = plist->pstats[curr];
if (tgid) {
sprintf(filename, TASK_SMAP, tgid, pid);
}
else {
sprintf(filename, PID_SMAP, pid);
}
if ((fp = fopen(filename, "rt")) == NULL)
/* No such process */
return 1;
while ((state < 3) && (fgets(line, sizeof(line), fp) != NULL)) {
switch (state) {
case 0:
if (strstr(line, "[stack]")) {
state = 1;
}
break;
case 1:
if (strstr(line, "Size:")) {
sscanf(line + sizeof("Size:"), "%lu", &pst->stack_size);
state = 2;
}
break;
case 2:
if (strstr(line, "Referenced:")) {
sscanf(line + sizeof("Referenced:"), "%lu", &pst->stack_ref);
state = 3;
}
break;
}
}
fclose(fp);
return 0;
}
/*
*****************************************************************************
* Read process command line from /proc/#[/task/##]/cmdline.
*
* IN:
* @pid Process whose command line is to be read.
* @plist Pointer on the linked list where PID is saved.
* @tgid If != 0, thread whose stats are to be read.
*
* OUT:
* @pst Pointer on structure where command line has been saved.
*
* RETURNS:
* 0 if command line has been successfully read (even if the /proc/.../cmdline
* is just empty), and 1 otherwise (the process has terminated).
*****************************************************************************
*/
int read_proc_pid_cmdline(pid_t pid, struct st_pid *plist, pid_t tgid)
{
FILE *fp;
char filename[128], line[MAX_CMDLINE_LEN];
size_t len;
int found = FALSE;
if (tgid) {
sprintf(filename, TASK_CMDLINE, tgid, pid);
}
else {
sprintf(filename, PID_CMDLINE, pid);
}
if ((fp = fopen(filename, "r")) == NULL)
/* No such process */
return 1;
memset(line, 0, MAX_CMDLINE_LEN);
len = fread(line, 1, sizeof(line) - 1, fp);
fclose(fp);
if (len) {
int i;
for (i = len - 2; i >= 0; i--) {
if (line[i]) {
found = TRUE;
}
else if (found) {
line[i] = ' ';
}
}
strncpy(plist->cmdline, line, sizeof(plist->cmdline) - 1);
plist->cmdline[sizeof(plist->cmdline) - 1] = '\0';
}
else {
/* proc/.../cmdline was empty */
plist->cmdline[0] = '\0';
}
return 0;
}
/*
***************************************************************************
* Read stats from /proc/#[/task/##]/io.
*
* IN:
* @pid Process whose stats are to be read.
* @plist Pointer on the linked list where PID is saved.
* @tgid If != 0, thread whose stats are to be read.
* @curr Index in array for current sample statistics.
*
* RETURNS:
* 0 if stats have been successfully read.
* Also returns 0 if current process has terminated or if its io file
* doesn't exist, but in this case, set process' F_NO_PID_IO flag to
* indicate that I/O stats should no longer be read for it.
***************************************************************************
*/
int read_proc_pid_io(pid_t pid, struct st_pid *plist, pid_t tgid, int curr)
{
FILE *fp;
char filename[128], line[256];
struct pid_stats *pst = plist->pstats[curr];
if (tgid) {
sprintf(filename, TASK_IO, tgid, pid);
}
else {
sprintf(filename, PID_IO, pid);
}
if ((fp = fopen(filename, "r")) == NULL) {
/* No such process... or file non existent! */
plist->flags |= F_NO_PID_IO;
/*
* Also returns 0 since io stats file doesn't necessarily exist,
* depending on the kernel version used.
*/
return 0;
}
while (fgets(line, sizeof(line), fp) != NULL) {
if (!strncmp(line, "read_bytes:", 11)) {
sscanf(line + 12, "%llu", &pst->read_bytes);
}
else if (!strncmp(line, "write_bytes:", 12)) {
sscanf(line + 13, "%llu", &pst->write_bytes);
}
else if (!strncmp(line, "cancelled_write_bytes:", 22)) {
sscanf(line + 23, "%llu", &pst->cancelled_write_bytes);
}
}
fclose(fp);
plist->flags &= ~F_NO_PID_IO;
return 0;
}
/*
***************************************************************************
* Count number of file descriptors in /proc/#[/task/##]/fd directory.
*
* IN:
* @pid Process whose stats are to be read.
* @plist Pointer on the linked list where PID is saved.
* @tgid If != 0, thread whose stats are to be read.
* @curr Index in array for current sample statistics.
*
* RETURNS:
* 0 if stats have been successfully read.
* Also returns 0 if current process has terminated or if we cannot read its
* fd directory, but in this case, set process' F_NO_PID_FD flag to
* indicate that fd directory couldn't be read.
***************************************************************************
*/
int read_proc_pid_fd(pid_t pid, struct st_pid *plist, pid_t tgid, int curr)
{
DIR *dir;
struct dirent *drp;
char filename[128];
struct pid_stats *pst = plist->pstats[curr];
if (tgid) {
sprintf(filename, TASK_FD, tgid, pid);
}
else {
sprintf(filename, PID_FD, pid);
}
if ((dir = opendir(filename)) == NULL) {
/* Cannot read fd directory */
plist->flags |= F_NO_PID_FD;
return 0;
}
pst->fd_nr = 0;
/* Count number of entries if fd directory */
while ((drp = readdir(dir)) != NULL) {
if (isdigit(drp->d_name[0])) {
(pst->fd_nr)++;
}
}
closedir(dir);
plist->flags &= ~F_NO_PID_FD;
return 0;
}
/*
***************************************************************************
* Read various stats for given PID.
*
* IN:
* @pid Process whose stats are to be read.
* @plist Pointer on the linked list where PID is saved.
* @tgid If !=0, thread whose stats are to be read.
* @curr Index in array for current sample statistics.
*
* OUT:
* @thread_nr Number of threads of the process.
*
* RETURNS:
* 0 if stats have been successfully read, and 1 otherwise.
***************************************************************************
*/
int read_pid_stats(pid_t pid, struct st_pid *plist, unsigned int *thread_nr,
pid_t tgid, int curr)
{
if (read_proc_pid_stat(pid, plist, thread_nr, tgid, curr))
return 1;
/*
* No need to test the return code here: Not finding
* the schedstat files shouldn't make pidstat stop.
*/
read_proc_pid_sched(pid, plist, tgid, curr);
if (DISPLAY_CMDLINE(pidflag) && !plist->cmdline[0]) {
if (read_proc_pid_cmdline(pid, plist, tgid))
return 1;
}
if (read_proc_pid_status(pid, plist, tgid, curr))
return 1;
if (DISPLAY_STACK(actflag)) {
if (read_proc_pid_smap(pid, plist, tgid, curr))
return 1;
}
if (DISPLAY_KTAB(actflag)) {
if (read_proc_pid_fd(pid, plist, tgid, curr))
return 1;
}
if (DISPLAY_IO(actflag))
/* Assume that /proc/#/task/#/io exists! */
return (read_proc_pid_io(pid, plist, tgid, curr));
return 0;
}
/*
***************************************************************************
* Read stats for threads in /proc/#/task directory.
*
* IN:
* @pid Process number whose threads stats are to be read.
* @plist Pointer on the linked list where PID is saved.
* @curr Index in array for current sample statistics.
***************************************************************************
*/
void read_task_stats(pid_t pid, struct st_pid *plist, int curr)
{
DIR *dir;
pid_t tid;
struct dirent *drp;
char filename[128];
unsigned int thr_nr;
struct st_pid *tlist;
/* Open /proc/#/task directory */
sprintf(filename, PROC_TASK, pid);
if ((dir = __opendir(filename)) == NULL)
return;
while ((drp = __readdir(dir)) != NULL) {
if (!isdigit(drp->d_name[0])) {
continue;
}
tid = atoi(drp->d_name);
tlist = add_list_pid(&pid_list, tid, pid);
if (!tlist)
continue;
tlist->exist = TRUE;
if (read_pid_stats(tid, tlist, &thr_nr, pid, curr)) {
/* Thread doesn't exist */
tlist->exist = FALSE;
}
}
__closedir(dir);
}
/*
***************************************************************************
* Read various stats.
*
* IN:
* @curr Index in array for current sample statistics.
***************************************************************************
*/
void read_stats(int curr)
{
unsigned int thr_nr;
pid_t pid;
struct st_pid *plist;
struct stats_cpu *st_cpu;
/*
* Allocate two structures for CPU statistics.
* No need to init them (done by read_stat_cpu() function).
*/
if ((st_cpu = (struct stats_cpu *) malloc(STATS_CPU_SIZE * 2)) == NULL) {
perror("malloc");
exit(4);
}
/* Read statistics for CPUs "all" */
read_stat_cpu(st_cpu, 1);
/*
* Compute the total number of jiffies spent by all processors.
* NB: Don't add cpu_guest/cpu_guest_nice because cpu_user/cpu_nice
* already include them.
*/
tot_jiffies[curr] = st_cpu->cpu_user + st_cpu->cpu_nice +
st_cpu->cpu_sys + st_cpu->cpu_idle +
st_cpu->cpu_iowait + st_cpu->cpu_hardirq +
st_cpu->cpu_steal + st_cpu->cpu_softirq;
free(st_cpu);
if (DISPLAY_ALL_PID(pidflag)) {
DIR *dir;
struct dirent *drp;
/* Open /proc directory */
if ((dir = __opendir(PROC)) == NULL) {
perror("opendir");
exit(4);
}
/* Get directory entries */
while ((drp = __readdir(dir)) != NULL) {
if (!isdigit(drp->d_name[0])) {
continue;
}
pid = atoi(drp->d_name);
plist = add_list_pid(&pid_list, pid, 0);
if (!plist)
continue;
plist->exist = TRUE;
if (read_pid_stats(pid, plist, &thr_nr, 0, curr)) {
/* PID has terminated */
plist->exist = FALSE;
} else if (DISPLAY_TID(pidflag)) {
/* Read stats for threads in task subdirectory */
read_task_stats(pid, plist, curr);