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sa_common.c
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sa_common.c
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/*
* sar and sadf common routines.
* (C) 1999-2019 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 <stdint.h>
#include <time.h>
#include <errno.h>
#include <unistd.h> /* For STDOUT_FILENO, among others */
#include <dirent.h>
#include <fcntl.h>
#include <libgen.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include "version.h"
#include "sa.h"
#include "ioconf.h"
#ifdef USE_NLS
#include <locale.h>
#include <libintl.h>
#define _(string) gettext(string)
#else
#define _(string) (string)
#endif
int default_file_used = FALSE;
extern struct act_bitmap cpu_bitmap;
extern unsigned int dm_major;
unsigned int hdr_types_nr[] = {FILE_HEADER_ULL_NR, FILE_HEADER_UL_NR, FILE_HEADER_U_NR};
unsigned int act_types_nr[] = {FILE_ACTIVITY_ULL_NR, FILE_ACTIVITY_UL_NR, FILE_ACTIVITY_U_NR};
unsigned int rec_types_nr[] = {RECORD_HEADER_ULL_NR, RECORD_HEADER_UL_NR, RECORD_HEADER_U_NR};
unsigned int nr_types_nr[] = {0, 0, 1};
/*
***************************************************************************
* Look for activity in array.
*
* IN:
* @act Array of activities.
* @act_flag Activity flag to look for.
* @stop TRUE if sysstat should exit when activity is not found.
*
* RETURNS:
* Position of activity in array, or -1 if not found (this may happen when
* reading data from a system activity file created by another version of
* sysstat).
***************************************************************************
*/
int get_activity_position(struct activity *act[], unsigned int act_flag, int stop)
{
int i;
for (i = 0; i < NR_ACT; i++) {
if (act[i]->id == act_flag)
return i;
}
if (stop) {
PANIC((int) act_flag);
}
return -1;
}
/*
***************************************************************************
* Count number of activities with given option.
*
* IN:
* @act Array of activities.
* @option Option that activities should have to be counted
* (eg. AO_COLLECTED...)
* @count_outputs TRUE if each output should be counted for activities with
* multiple outputs.
*
* RETURNS:
* Number of selected activities
***************************************************************************
*/
int get_activity_nr(struct activity *act[], unsigned int option, int count_outputs)
{
int i, n = 0;
unsigned int msk;
for (i = 0; i < NR_ACT; i++) {
if ((act[i]->options & option) == option) {
if (HAS_MULTIPLE_OUTPUTS(act[i]->options) && count_outputs) {
for (msk = 1; msk < 0x100; msk <<= 1) {
if ((act[i]->opt_flags & 0xff) & msk) {
n++;
}
}
}
else {
n++;
}
}
}
return n;
}
/*
***************************************************************************
* Look for the most recent of saDD and saYYYYMMDD to decide which one to
* use. If neither exists then use saDD by default.
*
* IN:
* @sa_dir Directory where standard daily data files are saved.
* @rectime Structure containing the current date.
*
* OUT:
* @sa_name 0 to use saDD data files,
* 1 to use saYYYYMMDD data files.
***************************************************************************
*/
void guess_sa_name(char *sa_dir, struct tm *rectime, int *sa_name)
{
char filename[MAX_FILE_LEN];
struct stat sb;
time_t sa_mtime;
/* Use saDD by default */
*sa_name = 0;
/* Look for saYYYYMMDD */
snprintf(filename, MAX_FILE_LEN,
"%s/sa%04d%02d%02d", sa_dir,
rectime->tm_year + 1900,
rectime->tm_mon + 1,
rectime->tm_mday);
filename[MAX_FILE_LEN - 1] = '\0';
if (stat(filename, &sb) < 0)
/* Cannot find or access saYYYYMMDD, so use saDD */
return;
sa_mtime = sb.st_mtime;
/* Look for saDD */
snprintf(filename, MAX_FILE_LEN,
"%s/sa%02d", sa_dir,
rectime->tm_mday);
filename[MAX_FILE_LEN - 1] = '\0';
if (stat(filename, &sb) < 0) {
/* Cannot find or access saDD, so use saYYYYMMDD */
*sa_name = 1;
return;
}
if (sa_mtime > sb.st_mtime) {
/* saYYYYMMDD is more recent than saDD, so use it */
*sa_name = 1;
}
}
/*
***************************************************************************
* Set current daily data file name.
*
* IN:
* @datafile If not an empty string then this is the alternate directory
* location where daily data files will be saved.
* @d_off Day offset (number of days to go back in the past).
* @sa_name 0 for saDD data files,
* 1 for saYYYYMMDD data files,
* -1 if unknown. In this case, will look for the most recent
* of saDD and saYYYYMMDD and use it.
*
* OUT:
* @datafile Name of daily data file.
*
* RETURNS:
* 1 if an output error has been encountered or if datafile name has been
* truncated, or 0 otherwise.
***************************************************************************
*/
int set_default_file(char *datafile, int d_off, int sa_name)
{
char sa_dir[MAX_FILE_LEN];
struct tm rectime = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL};
int err = 0;
/* Set directory where daily data files will be saved */
if (datafile[0]) {
strncpy(sa_dir, datafile, MAX_FILE_LEN);
}
else {
strncpy(sa_dir, SA_DIR, MAX_FILE_LEN);
}
sa_dir[MAX_FILE_LEN - 1] = '\0';
get_time(&rectime, d_off);
if (sa_name < 0) {
/*
* Look for the most recent of saDD and saYYYYMMDD
* and use it. If neither exists then use saDD.
* sa_name is set accordingly.
*/
guess_sa_name(sa_dir, &rectime, &sa_name);
}
if (sa_name) {
/* Using saYYYYMMDD data files */
err = snprintf(datafile, MAX_FILE_LEN,
"%s/sa%04d%02d%02d", sa_dir,
rectime.tm_year + 1900,
rectime.tm_mon + 1,
rectime.tm_mday);
}
else {
/* Using saDD data files */
err = snprintf(datafile, MAX_FILE_LEN,
"%s/sa%02d", sa_dir,
rectime.tm_mday);
}
datafile[MAX_FILE_LEN - 1] = '\0';
default_file_used = TRUE;
return ((err < 0) || (err >= MAX_FILE_LEN));
}
/*
***************************************************************************
* Check data file type. If it is a directory then this is the alternate
* location where daily data files will be saved.
*
* IN:
* @datafile Name of the daily data file. May be a directory.
* @d_off Day offset (number of days to go back in the past).
* @sa_name 0 for saDD data files,
* 1 for saYYYYMMDD data files,
* -1 if unknown. In this case, will look for the most recent
* of saDD and saYYYYMMDD and use it.
*
*
* OUT:
* @datafile Name of the daily data file. This is now a plain file, not
* a directory.
*
* RETURNS:
* 1 if @datafile was a directory, and 0 otherwise.
***************************************************************************
*/
int check_alt_sa_dir(char *datafile, int d_off, int sa_name)
{
struct stat sb;
if (stat(datafile, &sb) == 0) {
if (S_ISDIR(sb.st_mode)) {
/*
* This is a directory: So append
* the default file name to it.
*/
set_default_file(datafile, d_off, sa_name);
return 1;
}
}
return 0;
}
/*
***************************************************************************
* Display sysstat version used to create system activity data file.
*
* IN:
* @st Output stream (stderr or stdout).
* @file_magic File magic header.
***************************************************************************
*/
void display_sa_file_version(FILE *st, struct file_magic *file_magic)
{
fprintf(st, _("File created by sar/sadc from sysstat version %d.%d.%d"),
file_magic->sysstat_version,
file_magic->sysstat_patchlevel,
file_magic->sysstat_sublevel);
if (file_magic->sysstat_extraversion) {
fprintf(st, ".%d", file_magic->sysstat_extraversion);
}
fprintf(st, "\n");
}
/*
***************************************************************************
* An invalid system activity file has been opened for reading.
* If this file was created by an old version of sysstat, tell it to the
* user...
*
* IN:
* @fd Descriptor of the file that has been opened.
* @file_magic file_magic structure filled with file magic header data.
* May contain invalid data.
* @file Name of the file being read.
* @n Number of bytes read while reading file magic header.
* This function may also be called after failing to read file
* standard header, or if CPU activity has not been found in
* file. In this case, n is set to 0.
***************************************************************************
*/
void handle_invalid_sa_file(int fd, struct file_magic *file_magic, char *file,
int n)
{
fprintf(stderr, _("Invalid system activity file: %s\n"), file);
if (n == FILE_MAGIC_SIZE) {
if ((file_magic->sysstat_magic == SYSSTAT_MAGIC) || (file_magic->sysstat_magic == SYSSTAT_MAGIC_SWAPPED)) {
/* This is a sysstat file, but this file has an old format */
display_sa_file_version(stderr, file_magic);
fprintf(stderr,
_("Current sysstat version cannot read the format of this file (%#x)\n"),
file_magic->sysstat_magic == SYSSTAT_MAGIC ?
file_magic->format_magic : __builtin_bswap16(file_magic->format_magic));
}
}
close (fd);
exit(3);
}
/*
***************************************************************************
* Display an error message then exit.
***************************************************************************
*/
void print_collect_error(void)
{
fprintf(stderr, _("Requested activities not available\n"));
exit(1);
}
/*
***************************************************************************
* Fill system activity file magic header.
*
* IN:
* @file_magic System activity file magic header.
***************************************************************************
*/
void enum_version_nr(struct file_magic *fm)
{
char *v;
char version[16];
fm->sysstat_extraversion = 0;
strcpy(version, VERSION);
/* Get version number */
if ((v = strtok(version, ".")) == NULL)
return;
fm->sysstat_version = atoi(v) & 0xff;
/* Get patchlevel number */
if ((v = strtok(NULL, ".")) == NULL)
return;
fm->sysstat_patchlevel = atoi(v) & 0xff;
/* Get sublevel number */
if ((v = strtok(NULL, ".")) == NULL)
return;
fm->sysstat_sublevel = atoi(v) & 0xff;
/* Get extraversion number. Don't necessarily exist */
if ((v = strtok(NULL, ".")) == NULL)
return;
fm->sysstat_extraversion = atoi(v) & 0xff;
}
/*
***************************************************************************
* Write data to file. If the write() call was interrupted by a signal, try
* again so that the whole buffer can be written.
*
* IN:
* @fd Output file descriptor.
* @buf Data buffer.
* @nr_bytes Number of bytes to write.
*
* RETURNS:
* Number of bytes written to file, or -1 on error.
***************************************************************************
*/
int write_all(int fd, const void *buf, int nr_bytes)
{
int block, offset = 0;
char *buffer = (char *) buf;
while (nr_bytes > 0) {
block = write(fd, &buffer[offset], nr_bytes);
if (block < 0) {
if (errno == EINTR)
continue;
return block;
}
if (block == 0)
return offset;
offset += block;
nr_bytes -= block;
}
return offset;
}
#ifndef SOURCE_SADC
/*
***************************************************************************
* Allocate structures.
*
* IN:
* @act Array of activities.
***************************************************************************
*/
void allocate_structures(struct activity *act[])
{
int i, j;
for (i = 0; i < NR_ACT; i++) {
if (act[i]->nr_ini > 0) {
for (j = 0; j < 3; j++) {
SREALLOC(act[i]->buf[j], void,
(size_t) act[i]->msize * (size_t) act[i]->nr_ini * (size_t) act[i]->nr2);
}
act[i]->nr_allocated = act[i]->nr_ini;
}
}
}
/*
***************************************************************************
* Free structures.
*
* IN:
* @act Array of activities.
***************************************************************************
*/
void free_structures(struct activity *act[])
{
int i, j;
for (i = 0; i < NR_ACT; i++) {
if (act[i]->nr_allocated > 0) {
for (j = 0; j < 3; j++) {
if (act[i]->buf[j]) {
free(act[i]->buf[j]);
act[i]->buf[j] = NULL;
}
}
act[i]->nr_allocated = 0;
}
}
}
/*
***************************************************************************
* Reallocate all the buffers for a given activity.
*
* IN:
* @a Activity whose buffers need to be reallocated.
* @nr_min Minimum number of items that the new buffers should be able
* to receive.
***************************************************************************
*/
void reallocate_all_buffers(struct activity *a, __nr_t nr_min)
{
int j;
size_t nr_realloc;
if (nr_min <= 0) {
nr_min = 1;
}
if (!a->nr_allocated) {
nr_realloc = nr_min;
}
else {
nr_realloc = a->nr_allocated;
do {
nr_realloc = nr_realloc * 2;
}
while (nr_realloc < nr_min);
}
for (j = 0; j < 3; j++) {
SREALLOC(a->buf[j], void,
(size_t) a->msize * nr_realloc * (size_t) a->nr2);
/* Init additional space which has been allocated */
if (a->nr_allocated) {
memset(a->buf[j] + a->msize * a->nr_allocated * a->nr2, 0,
(size_t) a->msize * (size_t) (nr_realloc - a->nr_allocated) * (size_t) a->nr2);
}
}
a->nr_allocated = nr_realloc;
}
/*
***************************************************************************
* Try to get device real name from sysfs tree.
*
* IN:
* @major Major number of the device.
* @minor Minor number of the device.
*
* RETURNS:
* The name of the device, which may be the real name (as it appears in /dev)
* or NULL.
***************************************************************************
*/
char *get_devname_from_sysfs(unsigned int major, unsigned int minor)
{
static char link[32], target[PATH_MAX];
char *devname;
ssize_t r;
snprintf(link, 32, "%s/%u:%u", SYSFS_DEV_BLOCK, major, minor);
/* Get full path to device knowing its major and minor numbers */
r = readlink(link, target, PATH_MAX);
if (r <= 0 || r >= PATH_MAX) {
return (NULL);
}
target[r] = '\0';
/* Get device name */
devname = basename(target);
if (!devname || strnlen(devname, FILENAME_MAX) == 0) {
return (NULL);
}
return (devname);
}
/*
***************************************************************************
* Get device real name if possible.
* Warning: This routine may return a bad name on 2.4 kernels where
* disk activities are read from /proc/stat.
*
* IN:
* @major Major number of the device.
* @minor Minor number of the device.
* @pretty TRUE if the real name of the device (as it appears in /dev)
* should be returned.
*
* RETURNS:
* The name of the device, which may be the real name (as it appears in /dev)
* or a string with the following format devM-n.
***************************************************************************
*/
char *get_devname(unsigned int major, unsigned int minor, int pretty)
{
static char buf[32];
char *name;
snprintf(buf, 32, "dev%u-%u", major, minor);
if (!pretty)
return (buf);
name = get_devname_from_sysfs(major, minor);
if (name != NULL)
return (name);
name = ioc_name(major, minor);
if ((name != NULL) && strcmp(name, K_NODEV))
return (name);
return (buf);
}
/*
***************************************************************************
* Check if we are close enough to desired interval.
*
* IN:
* @uptime_ref Uptime used as reference. This is the system uptime for the
* first sample statistics, or the first system uptime after a
* LINUX RESTART (in 1/100th of a second).
* @uptime Current system uptime (in 1/100th of a second).
* @reset TRUE if @last_uptime should be reset with @uptime_ref.
* @interval Interval of time.
*
* RETURNS:
* 1 if we are actually close enough to desired interval, 0 otherwise.
***************************************************************************
*/
int next_slice(unsigned long long uptime_ref, unsigned long long uptime,
int reset, long interval)
{
unsigned long file_interval, entry;
static unsigned long long last_uptime = 0;
int min, max, pt1, pt2;
double f;
/* uptime is expressed in 1/100th of a second */
if (!last_uptime || reset) {
last_uptime = uptime_ref;
}
/* Interval cannot be greater than 0xffffffff here */
f = ((double) ((uptime - last_uptime) & 0xffffffff)) / 100;
file_interval = (unsigned long) f;
if ((f * 10) - (file_interval * 10) >= 5) {
file_interval++; /* Rounding to correct value */
}
last_uptime = uptime;
/*
* A few notes about the "algorithm" used here to display selected entries
* from the system activity file (option -f with -i flag):
* Let 'Iu' be the interval value given by the user on the command line,
* 'If' the interval between current and previous line in the system
* activity file,
* and 'En' the nth entry (identified by its time stamp) of the file.
* We choose In = [ En - If/2, En + If/2 [ if If is even,
* or In = [ En - If/2, En + If/2 ] if not.
* En will be displayed if
* (Pn * Iu) or (P'n * Iu) belongs to In
* with Pn = En / Iu and P'n = En / Iu + 1
*/
f = ((double) ((uptime - uptime_ref) & 0xffffffff)) / 100;
entry = (unsigned long) f;
if ((f * 10) - (entry * 10) >= 5) {
entry++;
}
min = entry - (file_interval / 2);
max = entry + (file_interval / 2) + (file_interval & 0x1);
pt1 = (entry / interval) * interval;
pt2 = ((entry / interval) + 1) * interval;
return (((pt1 >= min) && (pt1 < max)) || ((pt2 >= min) && (pt2 < max)));
}
/*
***************************************************************************
* Use time stamp to fill tstamp structure.
*
* IN:
* @timestamp Timestamp to decode (format: HH:MM:SS).
*
* OUT:
* @tse Structure containing the decoded timestamp.
*
* RETURNS:
* 0 if the timestamp has been successfully decoded, 1 otherwise.
***************************************************************************
*/
int decode_timestamp(char timestamp[], struct tstamp *tse)
{
timestamp[2] = timestamp[5] = '\0';
tse->tm_sec = atoi(×tamp[6]);
tse->tm_min = atoi(×tamp[3]);
tse->tm_hour = atoi(timestamp);
if ((tse->tm_sec < 0) || (tse->tm_sec > 59) ||
(tse->tm_min < 0) || (tse->tm_min > 59) ||
(tse->tm_hour < 0) || (tse->tm_hour > 23))
return 1;
tse->use = TRUE;
return 0;
}
/*
***************************************************************************
* Compare two timestamps.
*
* IN:
* @rectime Date and time for current sample.
* @tse Timestamp used as reference.
*
* RETURNS:
* A positive value if @rectime is greater than @tse,
* a negative one otherwise.
***************************************************************************
*/
int datecmp(struct tm *rectime, struct tstamp *tse)
{
if (rectime->tm_hour == tse->tm_hour) {
if (rectime->tm_min == tse->tm_min)
return (rectime->tm_sec - tse->tm_sec);
else
return (rectime->tm_min - tse->tm_min);
}
else
return (rectime->tm_hour - tse->tm_hour);
}
/*
***************************************************************************
* Parse a timestamp entered on the command line (hh:mm[:ss]) and decode it.
*
* IN:
* @argv Arguments list.
* @opt Index in the arguments list.
* @def_timestamp Default timestamp to use.
*
* OUT:
* @tse Structure containing the decoded timestamp.
*
* RETURNS:
* 0 if the timestamp has been successfully decoded, 1 otherwise.
***************************************************************************
*/
int parse_timestamp(char *argv[], int *opt, struct tstamp *tse,
const char *def_timestamp)
{
char timestamp[9];
if (argv[++(*opt)]) {
switch (strlen(argv[*opt])) {
case 5:
strncpy(timestamp, argv[(*opt)++], 5);
timestamp[5] = '\0';
strcat(timestamp, ":00");
break;
case 8:
strncpy(timestamp, argv[(*opt)++], 8);
break;
default:
strncpy(timestamp, def_timestamp, 8);
break;
}
} else {
strncpy(timestamp, def_timestamp, 8);
}
timestamp[8] = '\0';
return decode_timestamp(timestamp, tse);
}
/*
***************************************************************************
* Set interval value.
*
* IN:
* @record_hdr_curr Record with current sample statistics.
* @record_hdr_prev Record with previous sample statistics.
*
* OUT:
* @itv Interval of time in 1/100th of a second.
***************************************************************************
*/
void get_itv_value(struct record_header *record_hdr_curr,
struct record_header *record_hdr_prev,
unsigned long long *itv)
{
/* Interval value in jiffies */
*itv = get_interval(record_hdr_prev->uptime_cs,
record_hdr_curr->uptime_cs);
}
/*
***************************************************************************
* Fill the rectime structure with the file's creation date, based on file's
* time data saved in file header.
* The resulting timestamp is expressed in the locale of the file creator or
* in the user's own locale, depending on whether option -t has been used
* or not.
*
* IN:
* @flags Flags for common options and system state.
* @file_hdr System activity file standard header.
*
* OUT:
* @rectime Date (and possibly time) from file header. Only the date,
* not the time, should be used by the caller.
***************************************************************************
*/
void get_file_timestamp_struct(unsigned int flags, struct tm *rectime,
struct file_header *file_hdr)
{
if (PRINT_TRUE_TIME(flags)) {
/* Get local time. This is just to fill fields with a default value. */
get_time(rectime, 0);
rectime->tm_mday = file_hdr->sa_day;
rectime->tm_mon = file_hdr->sa_month;
rectime->tm_year = file_hdr->sa_year;
/*
* Call mktime() to set DST (Daylight Saving Time) flag.
* Has anyone a better way to do it?
*/
rectime->tm_hour = rectime->tm_min = rectime->tm_sec = 0;
mktime(rectime);
}
else {
localtime_r((const time_t *) &file_hdr->sa_ust_time, rectime);
}
}
/*
***************************************************************************
* Print report header.
*
* IN:
* @flags Flags for common options and system state.
* @file_hdr System activity file standard header.
*
* OUT:
* @rectime Date and time from file header.
***************************************************************************
*/
void print_report_hdr(unsigned int flags, struct tm *rectime,
struct file_header *file_hdr)
{
/* Get date of file creation */
get_file_timestamp_struct(flags, rectime, file_hdr);
/*
* Display the header.
* NB: Number of CPU (value in [1, NR_CPUS + 1]).
* 1 means that there is only one proc and non SMP kernel.
* 2 means one proc and SMP kernel. Etc.
*/
print_gal_header(rectime, file_hdr->sa_sysname, file_hdr->sa_release,
file_hdr->sa_nodename, file_hdr->sa_machine,
file_hdr->sa_cpu_nr > 1 ? file_hdr->sa_cpu_nr - 1 : 1,
PLAIN_OUTPUT);
}
/*
***************************************************************************
* Network interfaces may now be registered (and unregistered) dynamically.
* This is what we try to guess here.
*
* IN:
* @a Activity structure with statistics.
* @curr Index in array for current sample statistics.
* @ref Index in array for sample statistics used as reference.
* @pos Index on current network interface.
*
* RETURNS:
* Position of current network interface in array of sample statistics used
* as reference.
* -1 if it is a new interface (it was not present in array of stats used
* as reference).
* -2 if it is a known interface but which has been unregistered then
* registered again on the interval.
***************************************************************************
*/
int check_net_dev_reg(struct activity *a, int curr, int ref, int pos)
{
struct stats_net_dev *sndc, *sndp;
int j0, j = pos;
if (!a->nr[ref])
/*
* No items found in previous iteration:
* Current interface is necessarily new.
*/
return -1;
if (j >= a->nr[ref]) {
j = a->nr[ref] - 1;
}
j0 = j;
sndc = (struct stats_net_dev *) ((char *) a->buf[curr] + pos * a->msize);
do {
sndp = (struct stats_net_dev *) ((char *) a->buf[ref] + j * a->msize);
if (!strcmp(sndc->interface, sndp->interface)) {
/*
* Network interface found.
* If a counter has decreased, then we may assume that the
* corresponding interface was unregistered, then registered again.
*/
if ((sndc->rx_packets < sndp->rx_packets) ||
(sndc->tx_packets < sndp->tx_packets) ||
(sndc->rx_bytes < sndp->rx_bytes) ||
(sndc->tx_bytes < sndp->tx_bytes) ||
(sndc->rx_compressed < sndp->rx_compressed) ||
(sndc->tx_compressed < sndp->tx_compressed) ||
(sndc->multicast < sndp->multicast)) {
/*
* Special processing for rx_bytes (_packets) and
* tx_bytes (_packets) counters: If the number of
* bytes (packets) has decreased, whereas the number of
* packets (bytes) has increased, then assume that the
* relevant counter has met an overflow condition, and that
* the interface was not unregistered, which is all the
* more plausible that the previous value for the counter
* was > ULLONG_MAX/2.
* NB: the average value displayed will be wrong in this case...
*
* If such an overflow is detected, just set the flag. There is no
* need to handle this in a special way: the difference is still
* properly calculated if the result is of the same type (i.e.
* unsigned long) as the two values.
*/
int ovfw = FALSE;
if ((sndc->rx_bytes < sndp->rx_bytes) &&
(sndc->rx_packets > sndp->rx_packets) &&
(sndp->rx_bytes > (~0ULL >> 1))) {
ovfw = TRUE;
}
if ((sndc->tx_bytes < sndp->tx_bytes) &&
(sndc->tx_packets > sndp->tx_packets) &&
(sndp->tx_bytes > (~0ULL >> 1))) {
ovfw = TRUE;
}
if ((sndc->rx_packets < sndp->rx_packets) &&
(sndc->rx_bytes > sndp->rx_bytes) &&
(sndp->rx_packets > (~0ULL >> 1))) {
ovfw = TRUE;
}
if ((sndc->tx_packets < sndp->tx_packets) &&
(sndc->tx_bytes > sndp->tx_bytes) &&
(sndp->tx_packets > (~0ULL >> 1))) {
ovfw = TRUE;
}
if (!ovfw)
/*
* OK: Assume here that the device was
* actually unregistered.
*/
return -2;
}
return j;
}
if (++j >= a->nr[ref]) {
j = 0;
}
}
while (j != j0);
/* This is a newly registered interface */
return -1;
}
/*
***************************************************************************
* Network interfaces may now be registered (and unregistered) dynamically.
* This is what we try to guess here.
*
* IN:
* @a Activity structure with statistics.
* @curr Index in array for current sample statistics.
* @ref Index in array for sample statistics used as reference.
* @pos Index on current network interface.
*
* RETURNS:
* Position of current network interface in array of sample statistics used
* as reference.
* -1 if it is a newly registered interface.
* -2 if it is a known interface but which has been unregistered then
* registered again on the interval.
***************************************************************************
*/
int check_net_edev_reg(struct activity *a, int curr, int ref, int pos)
{
struct stats_net_edev *snedc, *snedp;
int j0, j = pos;
if (!a->nr[ref])
/*
* No items found in previous iteration:
* Current interface is necessarily new.
*/
return -1;