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rawlog.c
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rawlog.c
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/*
** ATOP - System & Process Monitor
**
** The program 'atop' offers the possibility to view the activity of
** the system on system-level as well as process-level.
** ==========================================================================
** Author: Gerlof Langeveld
** E-mail: gerlof.langeveld@atoptool.nl
** Date: September 2002
** Date: February 2024 (added cgroup support)
** --------------------------------------------------------------------------
** Copyright (C) 2000-2024 Gerlof Langeveld
**
** 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, or (at your option) any
** later version.
**
** This program is distributed in the hope that it will be useful, but
** WITHOUT ANY WARRANTY; without even 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
** --------------------------------------------------------------------------
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <time.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <signal.h>
#include <ctype.h>
#include <string.h>
#include <sys/utsname.h>
#include <string.h>
#include <regex.h>
#include <zlib.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include <sys/uio.h>
#include "atop.h"
#include "photoproc.h"
#include "photosyst.h"
#include "cgroups.h"
#include "showgeneric.h"
#include "rawlog.h"
#define BASEPATH "/var/log/atop"
#define BINPATH "/usr/bin/atop"
static int getrawrec (int, struct rawrecord *, int);
static int getrawsstat(int, struct sstat *, int);
static int getrawtstat(int, struct tstat *, int, int);
static int getrawcstat(int, struct cgchainer **,
unsigned long, unsigned long,
unsigned long, int, int);
static int rawwopen(void);
static int readchunk(int, void *, int);
static int lookslikedatetome(char *);
static void testcompval(int, char *);
static void try_other_version(int, int);
/*
** write a raw record to file
** (file is opened/created during the first call)
*/
char
rawwrite(time_t curtime, int numsecs,
struct devtstat *devtstat, struct sstat *sstat,
struct cgchainer *devchain, int ncgroups, int npids,
int nexit, unsigned int noverflow, char flag)
{
static int rawfd = -1;
struct rawrecord rr;
int rv;
struct stat filestat;
Byte scompbuf[sizeof(struct sstat)], *pcompbuf,
*ccompbuf = NULL, *icompbuf = NULL;
unsigned long soriglen = sizeof scompbuf, scomplen = compressBound(soriglen),
poriglen, pcomplen,
coriglen, ccomplen,
ioriglen, icomplen;
struct iovec iov[5];
int nrvectors;
/*
** first call:
** take care that the log file is opened
*/
if (rawfd == -1)
rawfd = rawwopen();
/*
** register current size of file in order to "roll back"
** writes that have been done while not *all* writes could
** succeed, e.g. when file system full
*/
(void) fstat(rawfd, &filestat);
/*
** compress system level metrics
*/
rv = compress(scompbuf, &scomplen, (Byte *)sstat, soriglen);
testcompval(rv, "compress system stats");
/*
** compress process level metrics
*/
poriglen = sizeof(struct tstat) * devtstat->ntaskall;
pcomplen = compressBound(poriglen);
pcompbuf = malloc(pcomplen);
ptrverify(pcompbuf, "Malloc failed for process compression buffer\n");
rv = compress(pcompbuf, &pcomplen, (Byte *)devtstat->taskall, poriglen);
testcompval(rv, "compress processes");
/*
** compress cgroup level metrics
*/
if (supportflags & CGROUPV2)
{
/*
** calculate the size of all contiguous cstat structs
** and compress
*/
coriglen = (char *)(devchain+ncgroups-1)->cstat -
(char *) devchain->cstat +
(devchain+ncgroups-1)->cstat->gen.structlen;
ccomplen = compressBound(coriglen);
ccompbuf = malloc(ccomplen);
ptrverify(ccompbuf, "Malloc failed for cgroup compression buffer\n");
rv = compress(ccompbuf, &ccomplen, (Byte *)devchain->cstat, coriglen);
testcompval(rv, "compress cgroups");
/*
** calculate the size of the cgroups pidlist
** and compress
*/
ioriglen = npids * sizeof(pid_t);
icomplen = compressBound(ioriglen);
icompbuf = malloc(icomplen);
ptrverify(icompbuf, "Malloc failed for cgroup compression pidlist\n");
rv = compress(icompbuf, &icomplen, (Byte *)devchain->proclist, ioriglen);
nrvectors = 5;
}
else
{
coriglen = ccomplen = 0;
ioriglen = icomplen = 0;
nrvectors = 3;
}
/*
** fill record header and write to file
*/
memset(&rr, 0, sizeof rr);
rr.curtime = curtime;
rr.interval = numsecs;
rr.flags = 0;
rr.ndeviat = devtstat->ntaskall;
rr.nactproc = devtstat->nprocactive;
rr.ntask = devtstat->ntaskall;
rr.nexit = nexit;
rr.noverflow = noverflow;
rr.totproc = devtstat->nprocall;
rr.totrun = devtstat->totrun;
rr.totslpi = devtstat->totslpi;
rr.totslpu = devtstat->totslpu;
rr.totidle = devtstat->totidle;
rr.totzomb = devtstat->totzombie;
rr.ncgroups = ncgroups;
rr.ncgpids = npids;
rr.scomplen = scomplen;
rr.pcomplen = pcomplen;
rr.ccomplen = ccomplen;
rr.coriglen = coriglen;
rr.icomplen = icomplen;
if (flag&RRBOOT)
rr.flags |= RRBOOT;
if (supportflags & ACCTACTIVE)
rr.flags |= RRACCTACTIVE;
if (supportflags & IOSTAT)
rr.flags |= RRIOSTAT;
if (supportflags & NETATOP)
rr.flags |= RRNETATOP;
if (supportflags & NETATOPD)
rr.flags |= RRNETATOPD;
if (supportflags & CGROUPV2)
rr.flags |= RRCGRSTAT;
if (supportflags & CONTAINERSTAT)
rr.flags |= RRCONTAINERSTAT;
if (supportflags & GPUSTAT)
rr.flags |= RRGPUSTAT;
/*
** use writev to make record operation atomic
** to avoid write uncompleted record data.
*/
iov[0].iov_base = &rr;
iov[0].iov_len = sizeof(rr);
iov[1].iov_base = scompbuf;
iov[1].iov_len = scomplen;
iov[2].iov_base = pcompbuf;
iov[2].iov_len = pcomplen;
iov[3].iov_base = ccompbuf;
iov[3].iov_len = ccomplen;
iov[4].iov_base = icompbuf;
iov[4].iov_len = icomplen;
if ( writev(rawfd, iov, nrvectors) == -1)
{
fprintf(stderr, "%s - ", orawname);
if ( ftruncate(rawfd, filestat.st_size) == -1)
mcleanstop(8,
"failed to write raw/status/process record to %s\n",
orawname);
mcleanstop(7,
"failed to write raw/status/process record to %s\n",
orawname);
}
free(pcompbuf);
if (supportflags & CGROUPV2)
{
free(ccompbuf);
free(icompbuf);
}
return '\0';
}
/*
** open a raw file for writing
**
** if the raw file exists already:
** - read and validate the header record (be sure it is an atop-file)
** - seek to the end of the file
**
** if the raw file does not yet exist:
** - create the raw file
** - write a header record
**
** return the filedescriptor of the raw file
*/
static int
rawwopen()
{
struct rawheader rh;
int fd;
struct stat filestats;
/*
** check if the file exists already
*/
if ( (fd = open(orawname, O_RDWR)) >= 0 )
{
/*
** check if the file already contains a file header (and records)
*/
if (fstat(fd, &filestats) == 0 && filestats.st_size > 0)
{
/*
** read and verify raw file header
*/
if ( read(fd, &rh, sizeof rh) < sizeof rh)
mcleanstop(7, "%s - cannot read header\n", orawname);
if (rh.magic != MYMAGIC)
mcleanstop(7, "file %s exists but does not contain raw "
"atop output (wrong magic number)\n", orawname);
if ( rh.sstatlen != sizeof(struct sstat) ||
rh.tstatlen != sizeof(struct tstat) ||
rh.cstatlen != sizeof(struct cstat) ||
rh.rawheadlen != sizeof(struct rawheader) ||
rh.rawreclen != sizeof(struct rawrecord) )
{
fprintf(stderr,
"existing file %s has incompatible header\n",
orawname);
if (rh.aversion & 0x8000 &&
(rh.aversion & 0x7fff) != getnumvers())
{
fprintf(stderr,
"(created by version %d.%d - "
"current version %d.%d)\n",
(rh.aversion >> 8) & 0x7f,
rh.aversion & 0xff,
getnumvers() >> 8,
getnumvers() & 0x7f);
}
cleanstop(7);
}
/*
** jump to end of file, being prepared to extend with more records
*/
(void) lseek(fd, (off_t) 0, SEEK_END);
return fd;
}
}
else
{
/*
** file does not exist (or can not be opened)
*/
if ( (fd = creat(orawname, 0666)) == -1)
{
fprintf(stderr, "%s - ", orawname);
perror("create raw file");
cleanstop(7);
}
}
/*
** empty file is opened now
** write a raw file header
*/
memset(&rh, 0, sizeof rh);
rh.magic = MYMAGIC;
rh.aversion = getnumvers() | 0x8000;
rh.sstatlen = sizeof(struct sstat);
rh.tstatlen = sizeof(struct tstat);
rh.cstatlen = sizeof(struct cstat);
rh.rawheadlen = sizeof(struct rawheader);
rh.rawreclen = sizeof(struct rawrecord);
rh.supportflags = supportflags | RAWLOGNG;
rh.osrel = osrel;
rh.osvers = osvers;
rh.ossub = ossub;
rh.hertz = hertz;
rh.pagesize = pagesize;
rh.pidwidth = getpidwidth();
memcpy(&rh.utsname, &utsname, sizeof rh.utsname);
if ( write(fd, &rh, sizeof rh) == -1)
{
fprintf(stderr, "%s - ", orawname);
perror("write raw header");
cleanstop(7);
}
return fd;
}
/*
** read the contents of a raw file
*/
#define OFFCHUNK 256
int
rawread(void)
{
static struct devtstat devtstat;
int i, j, v, rawfd, len, isregular = 1;
char *py;
struct rawheader rh;
struct rawrecord rr;
struct sstat sstat;
struct cgchainer *devchain = NULL;
struct stat filestat;
/*
** variables to maintain the offsets of the raw records
** to be able to see previous samples again
*/
off_t *offlist = NULL;
unsigned int offsize = 0;
unsigned int offcur = 0;
char lastcmd = 'X', flags;
time_t timenow;
struct tm *tp;
switch ( len = strlen(irawname) )
{
/*
** if no filename is specified, assemble the name of the raw file
*/
case 0:
timenow = time(0);
tp = localtime(&timenow);
snprintf(irawname, RAWNAMESZ, "%s/atop_%04d%02d%02d",
BASEPATH,
tp->tm_year+1900,
tp->tm_mon+1,
tp->tm_mday);
break;
/*
** if date specified as filename in format YYYYMMDD, assemble
** the full pathname of the raw file
*/
case 8:
if ( access(irawname, F_OK) == 0)
break; /* existing file */
if (lookslikedatetome(irawname))
{
char savedname[16];
strcpy(savedname, irawname); // no overflow (len=8)
snprintf(irawname, RAWNAMESZ, "%s/atop_%s",
BASEPATH,
savedname);
break;
}
/*
** if one or more 'y' (yesterday) characters are used and that
** string is not known as an existing file, the standard logfile
** is shown from N days ago (N is determined by the number
** of y's).
*/
default:
if ( access(irawname, F_OK) == 0)
break; /* existing file */
/*
** make a string existing of y's to compare with
*/
py = malloc(len+1);
ptrverify(py, "Malloc failed for 'yes' sequence\n");
memset(py, 'y', len);
*(py+len) = '\0';
if ( strcmp(irawname, py) == 0 )
{
timenow = time(0);
timenow -= len*3600*24;
tp = localtime(&timenow);
snprintf(irawname, RAWNAMESZ, "%s/atop_%04d%02d%02d",
BASEPATH,
tp->tm_year+1900,
tp->tm_mon+1,
tp->tm_mday);
}
free(py);
}
/*
** make sure the file is a regular file (seekable) or
** a pipe (not seekable)
*/
if (stat(irawname, &filestat) == -1)
{
fprintf(stderr, "%s - ", irawname);
perror("stat raw file");
cleanstop(7);
}
if (!S_ISREG(filestat.st_mode) && !S_ISFIFO(filestat.st_mode))
{
fprintf(stderr, "raw file must be a regular file or pipe\n");
cleanstop(7);
}
isregular = S_ISREG(filestat.st_mode);
/*
** open raw file
*/
if ( (rawfd = open(irawname, O_RDONLY)) == -1)
{
char command[512], tmpname1[200], tmpname2[200];
/*
** check if a compressed raw file is present
*/
snprintf(tmpname1, sizeof tmpname1, "%s.gz", irawname);
if ( access(tmpname1, F_OK|R_OK) == -1)
{
fprintf(stderr, "%s - ", irawname);
perror("open raw file");
cleanstop(7);
}
/*
** compressed raw file to be decompressed via gunzip
*/
fprintf(stderr, "Decompressing logfile ....\n");
snprintf(tmpname2, sizeof tmpname2, "/tmp/atopwrkXXXXXX");
rawfd = mkstemp(tmpname2);
if (rawfd == -1)
{
fprintf(stderr, "%s - ", irawname);
perror("creating decompression temp file");
cleanstop(7);
}
snprintf(command, sizeof command, "gunzip -c %s > %s",
tmpname1, tmpname2);
const int system_res = system (command);
unlink(tmpname2);
if (system_res)
{
fprintf(stderr, "%s - gunzip failed", irawname);
cleanstop(7);
}
}
/* make the kernel readahead more effective, */
if (isregular)
posix_fadvise(rawfd, 0, 0, POSIX_FADV_SEQUENTIAL);
/*
** read the raw header and verify the magic
*/
if ( readchunk(rawfd, &rh, sizeof rh) < sizeof rh)
{
fprintf(stderr, "can not read raw file header\n");
cleanstop(7);
}
if (rh.magic != MYMAGIC)
{
fprintf(stderr, "file %s does not contain raw atop/atopsar "
"output (wrong magic number)\n", irawname);
cleanstop(7);
}
/*
** magic okay, but file-layout might have been modified
*/
if (rh.sstatlen != sizeof(struct sstat) ||
rh.tstatlen != sizeof(struct tstat) ||
rh.cstatlen != sizeof(struct cstat) ||
rh.rawheadlen != sizeof(struct rawheader) ||
rh.rawreclen != sizeof(struct rawrecord) )
{
fprintf(stderr, "sstatlen: %d/%lu\n", rh.sstatlen, sizeof(struct sstat));
fprintf(stderr, "cstatlen: %d/%lu\n", rh.cstatlen, sizeof(struct cstat));
fprintf(stderr, "tstatlen: %d/%lu\n", rh.tstatlen, sizeof(struct tstat));
fprintf(stderr, "headlen: %d/%lu\n", rh.rawheadlen, sizeof(struct rawheader));
fprintf(stderr, "reclen: %d/%lu\n", rh.rawreclen, sizeof(struct rawrecord));
fprintf(stderr,
"\nraw file %s has incompatible format\n", irawname);
if (rh.aversion & 0x8000 &&
(rh.aversion & 0x7fff) != getnumvers())
{
fprintf(stderr,
"(created by version %d.%d - "
"current version %d.%d)\n",
(rh.aversion >> 8) & 0x7f,
rh.aversion & 0xff,
getnumvers() >> 8,
getnumvers() & 0x7f);
}
else
{
fprintf(stderr,
"(files from other system architectures might"
" be binary incompatible)\n");
}
close(rawfd);
if (((rh.aversion >> 8) & 0x7f) != (getnumvers() >> 8) ||
(rh.aversion & 0xff) != (getnumvers() & 0x7f) )
{
try_other_version((rh.aversion >> 8) & 0x7f,
rh.aversion & 0xff);
}
cleanstop(7);
}
memcpy(&utsname, &rh.utsname, sizeof utsname);
utsnodenamelen = strlen(utsname.nodename);
supportflags = rh.supportflags;
osrel = rh.osrel;
osvers = rh.osvers;
ossub = rh.ossub;
interval = 0;
if (rh.hertz)
hertz = rh.hertz;
if (rh.pagesize)
pagesize = rh.pagesize;
if (rh.pidwidth)
pidwidth = rh.pidwidth;
else
pidwidth = 5;
/*
** allocate a list for backtracking of rawrecord-offsets
*/
if (isregular)
{
offlist = malloc(sizeof(off_t) * OFFCHUNK);
ptrverify(offlist, "Malloc failed for backtrack list\n");
offsize = OFFCHUNK;
*offlist = lseek(rawfd, 0, SEEK_CUR);
offcur = 1;
}
/*
** read a raw record header until end-of-file
*/
sampcnt = 0;
while (lastcmd && lastcmd != 'q')
{
while ( getrawrec(rawfd, &rr, rh.rawreclen) == rh.rawreclen)
{
unsigned int k, l;
cursortime = rr.curtime; // maintain current
/*
** normalize the begintime and endtime if the
** format hh:mm has been used instead of an
** absolute date-time string
** (only happens for the first record)
*/
if (begintime <= SECONDSINDAY)
begintime = normalize_epoch(cursortime, begintime);
if (endtime && endtime <= SECONDSINDAY)
endtime = normalize_epoch(cursortime, endtime);
/*
** store the offset of the raw record in the offset list
** in case of offset list overflow, extend the list
*/
if (isregular)
{
*(offlist+offcur) = lseek(rawfd, 0, SEEK_CUR) - rh.rawreclen;
if ( ++offcur >= offsize )
{
offlist = realloc(offlist,
(offsize+OFFCHUNK)*sizeof(off_t));
ptrverify(offlist,
"Realloc failed for backtrack list\n");
offsize+= OFFCHUNK;
}
}
/*
** check if this sample is within the time-range
** specified with the -b and -e flags (if any)
*/
if ( (begintime > cursortime) )
{
lastcmd = 1;
if (isregular)
{
static off_t curr_pos = -1;
off_t next_pos;
lastcmd = 1;
next_pos = lseek(rawfd, rr.scomplen+rr.pcomplen+rr.ccomplen+rr.icomplen, SEEK_CUR);
if ((curr_pos >> READAHEADOFF) != (next_pos >> READAHEADOFF))
{
int liResult;
/* just read READAHEADSIZE bytes into page cache */
char *buf = malloc(READAHEADSIZE);
ptrverify(buf, "Malloc failed for readahead");
liResult = pread(rawfd, buf, READAHEADSIZE, next_pos & ~(READAHEADSIZE - 1));
if(liResult == -1)
{
char lcMessage[64];
snprintf(lcMessage, sizeof(lcMessage) - 1,
"%s:%d - Error %d in readahead\n",
__FILE__, __LINE__, errno);
fprintf(stderr, "%s", lcMessage);
}
free(buf);
}
curr_pos = next_pos;
continue;
}
else // named pipe not seekable
{
char *dummybuf = malloc(rr.scomplen+rr.pcomplen+rr.ccomplen+rr.icomplen);
ptrverify(dummybuf, "Malloc rawlog pipe buffer failed\n");
readchunk(rawfd, dummybuf, rr.scomplen+rr.pcomplen+rr.ccomplen+rr.icomplen);
free(dummybuf);
}
continue;
}
begintime = 0; // allow earlier times from now on
if ( (endtime && endtime < cursortime) )
{
if (isregular)
free(offlist);
close(rawfd);
return isregular;
}
/*
** allocate space, read compressed system-level
** metrics and decompress
*/
if ( !getrawsstat(rawfd, &sstat, rr.scomplen) )
cleanstop(7);
/*
** allocate space, read compressed process-level
** metrics and decompress
*/
devtstat.taskall = malloc(sizeof(struct tstat) * rr.ndeviat);
if (rr.totproc < rr.nactproc) // compat old raw files
devtstat.procall = malloc(sizeof(struct tstat *)
* rr.nactproc);
else
devtstat.procall = malloc(sizeof(struct tstat *)
* rr.totproc);
devtstat.procactive = malloc(sizeof(struct tstat *) *
rr.nactproc);
ptrverify(devtstat.taskall,
"Malloc failed for %d stored tasks\n",
rr.ndeviat);
ptrverify(devtstat.procall,
"Malloc failed for total %d processes\n",
rr.totproc);
ptrverify(devtstat.procactive,
"Malloc failed for %d active processes\n",
rr.nactproc);
if ( !getrawtstat(rawfd, devtstat.taskall,
rr.pcomplen, rr.ndeviat) )
cleanstop(7);
for (i=j=k=l=0; i < rr.ndeviat; i++)
{
if ( (devtstat.taskall+i)->gen.isproc)
{
devtstat.procall[j++] = devtstat.taskall+i;
if (! (devtstat.taskall+i)->gen.wasinactive)
devtstat.procactive[k++] = devtstat.taskall+i;
}
if (! (devtstat.taskall+i)->gen.wasinactive)
l++;
}
devtstat.ntaskall = i;
devtstat.nprocall = j;
devtstat.nprocactive = k;
devtstat.ntaskactive = l;
devtstat.totrun = rr.totrun;
devtstat.totslpi = rr.totslpi;
devtstat.totslpu = rr.totslpu;
devtstat.totidle = rr.totidle;
devtstat.totzombie = rr.totzomb;
/*
** allocate space, read compressed cgroup-level
** metrics, the pidlist and decompress
*/
if (rr.flags & RRCGRSTAT)
{
if ( !getrawcstat(rawfd, &devchain, rr.ccomplen, rr.coriglen,
rr.icomplen, rr.ncgroups, rr.ncgpids) )
cleanstop(7);
}
/*
** activate the installed print function to visualize
** the system metrics, process metrics and cgroup metrics
*/
sampcnt++;
if ( (rh.supportflags & RAWLOGNG) == RAWLOGNG)
{
if (rr.flags & RRACCTACTIVE)
supportflags |= ACCTACTIVE;
else
supportflags &= ~ACCTACTIVE;
if (rr.flags & RRIOSTAT)
supportflags |= IOSTAT;
else
supportflags &= ~IOSTAT;
}
if (rr.flags & RRNETATOP)
supportflags |= NETATOP;
else
supportflags &= ~NETATOP;
if (rr.flags & RRNETATOPD)
supportflags |= NETATOPD;
else
supportflags &= ~NETATOPD;
if (rr.flags & RRCGRSTAT)
supportflags |= CGROUPV2;
else
supportflags &= ~CGROUPV2;
if (rr.flags & RRCONTAINERSTAT)
supportflags |= CONTAINERSTAT;
else
supportflags &= ~CONTAINERSTAT;
if (rr.flags & RRGPUSTAT)
supportflags |= GPUSTAT;
else
supportflags &= ~GPUSTAT;
flags = rr.flags & RRBOOT;
nrgpus = sstat.gpu.nrgpus;
if (isregular)
{
(void) fstat(rawfd, &filestat);
if ( filestat.st_size -
lseek(rawfd, (off_t)0, SEEK_CUR)
<= rh.rawreclen)
flags |= RRLAST;
}
do
{
for (v=0; handlers[v].handle_sample; v++)
{
lastcmd = (handlers[v].handle_sample)(rr.curtime,
rr.interval, &devtstat, &sstat,
devchain, rr.ncgroups, rr.ncgpids,
rr.nexit, rr.noverflow, flags);
}
}
while (!isregular &&
( lastcmd == MSAMPPREV ||
lastcmd == MRESET ||
(lastcmd == MSAMPBRANCH &&
begintime < cursortime) ));
free(devtstat.taskall);
free(devtstat.procall);
free(devtstat.procactive);
if (rr.flags & RRCGRSTAT)
{
free(devchain->cstat);
free(devchain->proclist);
free(devchain);
}
switch (lastcmd)
{
case MSAMPPREV:
if (offcur >= 2)
offcur -= 2;
else
offcur = 0;
lseek(rawfd, *(offlist+offcur), SEEK_SET);
break;
case MRESET:
lseek(rawfd, *offlist, SEEK_SET);
offcur = 1;
break;
case MSAMPBRANCH:
if (begintime < cursortime && isregular)
{
lseek(rawfd, *offlist, SEEK_SET);
offcur = 1;
}
}
}
begintime = 0; // allow earlier times from now on
if (isregular)
{
if (offcur >= 1)
offcur--;
lseek(rawfd, *(offlist+offcur), SEEK_SET);
}
else
{
lastcmd = 'q';
}
}
if (isregular)
free(offlist);
close(rawfd);
return isregular;
}
/*
** read the next raw record from the raw logfile
*/
static int
getrawrec(int rawfd, struct rawrecord *prr, int rrlen)
{
return readchunk(rawfd, prr, rrlen);
}
/*
** read the system-level statistics from the current offset
*/
static int
getrawsstat(int rawfd, struct sstat *sp, int complen)