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various.c
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various.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.
**
** This source-file contains various functions to a.o. format the
** time-of-day, the cpu-time consumption and the memory-occupation.
** ==========================================================================
** Author: Gerlof Langeveld
** E-mail: gerlof.langeveld@atoptool.nl
** Date: November 1996
** LINUX-port: June 2000
** --------------------------------------------------------------------------
** Copyright (C) 2000-2022 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/stat.h>
#include <sys/times.h>
#include <signal.h>
#include <time.h>
#include <math.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <errno.h>
#include <stdarg.h>
#include <string.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <unistd.h>
#include <pwd.h>
#include <grp.h>
#include "atop.h"
#include "acctproc.h"
int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
static unsigned long long getbootlinux(long);
/*
** Function convtime() converts a value (number of seconds since
** 1-1-1970) to an ascii-string in the format hh:mm:ss, stored in
** chartim (9 bytes long).
*/
char *
convtime(time_t utime, char *chartim)
{
struct tm *tt;
tt = localtime(&utime);
snprintf(chartim, 9, "%02d:%02d:%02d", tt->tm_hour, tt->tm_min, tt->tm_sec);
return chartim;
}
/*
** Function convdate() converts a value (number of seconds since
** 1-1-1970) to an ascii-string in the format yyyy/mm/dd, stored in
** chardat (11 bytes long).
*/
char *
convdate(time_t utime, char *chardat)
{
struct tm *tt;
tt = localtime(&utime);
snprintf(chardat, 11, "%04u/%02u/%02u",
(tt->tm_year+1900)%10000, (tt->tm_mon+1)%100, tt->tm_mday%100);
return chardat;
}
/*
** Convert a string in format [YYYYMMDD]hh[:]mm[:][ss] into an epoch time value or
** when only the value hh[:]mm was given, take this time from midnight.
**
** Arguments: String with date-time in format [YYYYMMDD]hh[:]mm[:][ss]
** or hh[:]mm[:][ss].
**
** Pointer to time_t containing 0 or current epoch time.
**
** Return-value: 0 - Wrong input-format
** 1 - Success
*/
int
getbranchtime(char *itim, time_t *newtime)
{
register int ilen = strlen(itim);
int hours, minutes, seconds;
time_t epoch;
struct tm tm;
memset(&tm, 0, sizeof tm);
/*
** verify length of input string
*/
if (ilen != 4 && ilen != 5 && // hhmm or hh:mm
ilen != 6 && ilen != 8 && // hhmmss or hh:mm:ss
ilen != 12 && ilen != 13 && // YYYYMMDDhhmm or YYYYMMDDhh:mm
ilen != 14 && ilen != 16) // YYYYMMDDhhmmss or YYYYMMDDhh:mm:ss
return 0; // wrong date-time format
/*
** check string syntax for absolute time specified as
** YYYYMMDDhh:mm:ss or YYYYMMDDhhmmss
*/
if ( sscanf(itim, "%4d%2d%2d%2d:%2d:%2d", &tm.tm_year, &tm.tm_mon,
&tm.tm_mday, &tm.tm_hour, &tm.tm_min, &tm.tm_sec) == 6 ||
sscanf(itim, "%4d%2d%2d%2d%2d%2d", &tm.tm_year, &tm.tm_mon,
&tm.tm_mday, &tm.tm_hour, &tm.tm_min, &tm.tm_sec) == 6 )
{
tm.tm_year -= 1900;
tm.tm_mon -= 1;
if (tm.tm_year < 100 || tm.tm_mon < 0 || tm.tm_mon > 11 ||
tm.tm_mday < 1 || tm.tm_mday > 31 ||
tm.tm_hour < 0 || tm.tm_hour > 23 ||
tm.tm_min < 0 || tm.tm_min > 59 ||
tm.tm_sec < 0 || tm.tm_sec > 59 )
{
return 0; // wrong date-time format
}
tm.tm_isdst = -1;
if ((epoch = mktime(&tm)) == -1)
return 0; // wrong date-time format
// correct date-time format
*newtime = epoch;
return 1;
}
/*
** check string syntax for absolute time specified as
** YYYYMMDDhh:mm or YYYYMMDDhhmm
*/
if ( sscanf(itim, "%4d%2d%2d%2d:%2d", &tm.tm_year, &tm.tm_mon,
&tm.tm_mday, &tm.tm_hour, &tm.tm_min) == 5 ||
sscanf(itim, "%4d%2d%2d%2d%2d", &tm.tm_year, &tm.tm_mon,
&tm.tm_mday, &tm.tm_hour, &tm.tm_min) == 5 )
{
tm.tm_year -= 1900;
tm.tm_mon -= 1;
if (tm.tm_year < 100 || tm.tm_mon < 0 || tm.tm_mon > 11 ||
tm.tm_mday < 1 || tm.tm_mday > 31 ||
tm.tm_hour < 0 || tm.tm_hour > 23 ||
tm.tm_min < 0 || tm.tm_min > 59 )
{
return 0; // wrong date-time format
}
tm.tm_isdst = -1;
if ((epoch = mktime(&tm)) == -1)
return 0; // wrong date-time format
// correct date-time format
*newtime = epoch;
return 1;
}
/*
** check string syntax for relative time specified as
** hh:mm:ss or hhmmss
*/
if ( sscanf(itim, "%2d:%2d:%2d", &hours, &minutes, &seconds) == 3 ||
sscanf(itim, "%2d%2d%2d", &hours, &minutes, &seconds) == 3 )
{
if ( hours < 0 || hours > 23 ||
minutes < 0 || minutes > 59 ||
seconds < 0 || seconds > 59 )
return 0; // wrong date-time format
/*
** when the new time is already filled with an epoch time,
** the relative time will be on the same day as indicated by
** that epoch time
** when the new time is the time within a day or 0, the new
** time will be stored again as the time within a day.
*/
if (*newtime <= SECONDSINDAY) // time within the day?
{
*newtime = (hours * 3600) + (minutes * 60) + seconds;
if (*newtime >= SECONDSINDAY)
*newtime = SECONDSINDAY-1;
return 1;
}
else
{
*newtime = normalize_epoch(*newtime,
(hours*3600) + (minutes*60) + seconds);
return 1;
}
}
/*
** check string syntax for relative time specified as
** hh:mm or hhmm
*/
if ( sscanf(itim, "%2d:%2d", &hours, &minutes) == 2 ||
sscanf(itim, "%2d%2d", &hours, &minutes) == 2 )
{
if ( hours < 0 || hours > 23 || minutes < 0 || minutes > 59 )
return 0; // wrong date-time format
/*
** when the new time is already filled with an epoch time,
** the relative time will be on the same day as indicated by
** that epoch time
** when the new time is the time within a day or 0, the new
** time will be stored again as the time within a day.
*/
if (*newtime <= SECONDSINDAY) // time within the day?
{
*newtime = (hours * 3600) + (minutes * 60);
if (*newtime >= SECONDSINDAY)
*newtime = SECONDSINDAY-1;
return 1;
}
else
{
*newtime = normalize_epoch(*newtime,
(hours*3600) + (minutes*60));
return 1;
}
}
return 0; // wrong date-time format
}
/*
** Normalize an epoch time with the number of seconds within a day
** Return-value: Normalized epoch
*/
time_t
normalize_epoch(time_t epoch, long secondsinday)
{
struct tm tm;
localtime_r(&epoch, &tm); // convert epoch to tm
tm.tm_hour = 0;
tm.tm_min = 0;
tm.tm_sec = secondsinday;
tm.tm_isdst = -1;
return mktime(&tm); // convert tm to epoch
}
/*
** Function val2valstr() converts a positive value to an ascii-string of a
** fixed number of positions; if the value does not fit, it will be formatted
** to exponent-notation (as short as possible, so not via the standard printf-
** formatters %f or %e). The offered buffer should have a length of width+1.
** The value might even be printed as an average for the interval-time.
*/
char *
val2valstr(count_t value, char *strvalue, int width, int avg, int nsecs)
{
count_t maxval, remain = 0;
unsigned short exp = 0;
char *suffix = "";
int strsize = width+1;
if (avg && nsecs)
{
value = (value + (nsecs/2)) / nsecs; /* rounded value */
width = width - 2; /* subtract two positions for '/s' */
suffix = "/s";
}
if (value < 0) // no negative value expected
{
snprintf(strvalue, strsize, "%*s%s", width, "?", suffix);
return strvalue;
}
maxval = pow(10.0, width) - 1;
if (value < maxval)
{
snprintf(strvalue, strsize, "%*lld%s", width, value, suffix);
}
else
{
if (width < 3)
{
/*
** cannot avoid ignoring width
*/
snprintf(strvalue, strsize, "%lld%s", value, suffix);
}
else
{
/*
** calculate new maximum value for the string,
** calculating space for 'e' (exponent) + one digit
*/
width -= 2;
maxval = pow(10.0, width) - 1;
while (value > maxval)
{
exp++;
remain = value % 10;
value /= 10;
}
if (remain >= 5 && value < maxval)
value++;
snprintf(strvalue, strsize, "%*llde%hd%s",
width%100, value, exp%100, suffix);
}
}
return strvalue;
}
#define DAYSECS (24*60*60)
#define HOURSECS (60*60)
#define MINSECS (60)
/*
** Function val2elapstr() converts a value (number of seconds)
** to an ascii-string of up to max 13 positions in NNNdNNhNNmNNs
** stored in strvalue (at least 14 positions).
** returnvalue: number of bytes stored
*/
int
val2elapstr(int value, char *strvalue)
{
char *p = strvalue;
int rv, n = 14;
if (value >= DAYSECS)
{
rv = snprintf(p, n, "%dd", value/DAYSECS);
p += rv;
n -= rv;
}
if (value >= HOURSECS)
{
rv = snprintf(p, n, "%dh", (value%DAYSECS)/HOURSECS);
p += rv;
n -= rv;
}
if (value >= MINSECS)
{
rv = snprintf(p, n, "%dm", (value%HOURSECS)/MINSECS);
p += rv;
n -= rv;
}
rv = snprintf(p, n, "%ds", (value%MINSECS));
p += rv;
n -= rv;
return p - strvalue;
}
/*
** Function val2cpustr() converts a value (number of milliseconds)
** to an ascii-string of 6 positions in milliseconds or minute-seconds or
** hours-minutes, stored in strvalue (at least 7 positions).
*/
#define MAXMSEC (count_t)100000
#define MAXSEC (count_t)6000
#define MAXMIN (count_t)6000
char *
val2cpustr(count_t value, char *strvalue)
{
if (value < MAXMSEC)
{
snprintf(strvalue, 7, "%2llu.%02llus",
(value/1000)%100, value%1000/10);
}
else
{
/*
** millisecs irrelevant; round to seconds
*/
value = (value + 500) / 1000;
if (value < MAXSEC)
{
snprintf(strvalue, 7, "%2llum%02llus",
(value/60)%100, value%60);
}
else
{
/*
** seconds irrelevant; round to minutes
*/
value = (value + 30) / 60;
if (value < MAXMIN)
{
snprintf(strvalue, 7, "%2lluh%02llum",
(value/60)%100, value%60);
}
else
{
/*
** minutes irrelevant; round to hours
*/
value = (value + 30) / 60;
snprintf(strvalue, 7, "%2llud%02lluh",
(value/24)%100, value%24);
}
}
}
return strvalue;
}
/*
** Function val2Hzstr() converts a value (in MHz)
** to an ascii-string.
** The result-string is placed in the area pointed to strvalue,
** which should be able to contain 7 positions plus null byte.
*/
char *
val2Hzstr(count_t value, char *strvalue)
{
char *fformat;
if (value < 1000)
{
snprintf(strvalue, 8, "%4lluMHz", value%10000);
}
else
{
double fval=value/1000.0; // fval is double in GHz
char prefix='G';
if (fval >= 1000.0) // prepare for the future
{
prefix='T';
fval /= 1000.0;
}
if (fval < 10.0)
{
fformat = "%4.2f%cHz";
}
else
{
if (fval < 100.0)
fformat = "%4.1f%cHz";
else
fformat = "%4.0f%cHz";
}
snprintf(strvalue, 8, fformat, fval, prefix);
}
return strvalue;
}
/*
** Function val2memstr() converts a value (number of bytes)
** to an ascii-string in a specific format (indicated by pformat).
** The result-string is placed in the area pointed to strvalue,
** which should be able to contain at least 7 positions.
*/
#define ONEKBYTE 1024
#define ONEMBYTE 1048576
#define ONEGBYTE 1073741824L
#define ONETBYTE 1099511627776LL
#define ONEPBYTE 1125899906842624LL
#define ONEEBYTE 1152921504606846976LL
#define MAXLONGLONG 9223372036854775807LL
#define MAXBYTE 999
#define MAXKBYTE (ONEKBYTE*999L)
#define MAXKBYTE9 (ONEKBYTE*9L)
#define MAXMBYTE (ONEMBYTE*999L)
#define MAXMBYTE9 (ONEMBYTE*9L)
#define MAXGBYTE (ONEGBYTE*999LL)
#define MAXGBYTE9 (ONEGBYTE*9LL)
#define MAXTBYTE (ONETBYTE*999LL)
#define MAXTBYTE9 (ONETBYTE*9LL)
#define MAXPBYTE (ONEPBYTE*999LL)
#define MAXPBYTE9 (ONEPBYTE*9LL)
#define MAXEBYTE (ONEEBYTE*999LL)
#define MAXEBYTE8 (ONEEBYTE*7LL+(ONEEBYTE-1))
char *
val2memstr(count_t value, char *strvalue, int pformat, int avgval, int nsecs)
{
char aformat; /* advised format */
count_t verifyval;
char *suffix = "";
int basewidth = 6;
/*
** notice that the value can be negative, in which case the
** modulo-value should be evaluated and an extra position should
** be reserved for the sign
*/
if (value < 0)
verifyval = -value * 10;
else
verifyval = value;
/*
** verify if printed value is required per second (average) or total
*/
if (avgval && nsecs)
{
value = llround((double)((double)value/(double)nsecs));
verifyval = llround((double)((double)verifyval/(double)nsecs));
basewidth -= 2;
suffix = "/s";
if (verifyval <= MAXBYTE) /* bytes ? */
aformat = BFORMAT;
else
if (verifyval <= MAXKBYTE9) /* kbytes 1-9 ? */
aformat = KBFORMAT;
else
if (verifyval <= MAXKBYTE) /* kbytes ? */
aformat = KBFORMAT_INT;
else
if (verifyval <= MAXMBYTE9) /* mbytes 1-9 ? */
aformat = MBFORMAT;
else
if (verifyval <= MAXMBYTE) /* mbytes 10-999 ? */
aformat = MBFORMAT_INT;
else
if (verifyval <= MAXGBYTE9) /* gbytes 1-9 ? */
aformat = GBFORMAT;
else
if (verifyval <= MAXGBYTE) /* gbytes 10-999 ? */
aformat = GBFORMAT_INT;
else
if (verifyval <= MAXTBYTE9) /* tbytes 1-9 ? */
aformat = TBFORMAT;
else
if (verifyval <= MAXTBYTE) /* tbytes 10-999? */
aformat = TBFORMAT_INT;
else
if (verifyval <= MAXPBYTE9) /* pbytes 1-9 ? */
aformat = PBFORMAT;
else
if (verifyval <= MAXPBYTE) /* pbytes 10-999 ? */
aformat = PBFORMAT_INT;
else
if (verifyval <= MAXEBYTE8) /* ebytes 1-8 ? */
aformat = EBFORMAT;
else
aformat = OVFORMAT; /* max long long */
} else
/*
** printed value per interval (normal mode)
*/
{
/*
** determine which format will be used on bases of the value itself
*/
if (verifyval <= MAXBYTE) /* bytes ? */
aformat = BFORMAT;
else
if (verifyval <= MAXKBYTE) /* kbytes ? */
aformat = KBFORMAT;
else
if (verifyval <= MAXMBYTE) /* mbytes ? */
aformat = MBFORMAT;
else
if (verifyval <= MAXGBYTE) /* gbytes ? */
aformat = GBFORMAT;
else
if (verifyval <= MAXTBYTE) /* tbytes? */
aformat = TBFORMAT;
else
if (verifyval <= MAXPBYTE) /* pbytes? */
aformat = PBFORMAT;
else
aformat = EBFORMAT; /* ebytes! */
}
/*
** check if this is also the preferred format
*/
if (aformat <= pformat)
aformat = pformat;
switch (aformat)
{
case BFORMAT:
snprintf(strvalue, 7, "%*lldB%s",
basewidth-1, value, suffix);
break;
case KBFORMAT:
snprintf(strvalue, 7, "%*.1lfK%s",
basewidth-1, (double)((double)value/ONEKBYTE), suffix);
break;
case KBFORMAT_INT:
snprintf(strvalue, 7, "%*lldK%s",
basewidth-1, llround((double)((double)value/ONEKBYTE)), suffix);
break;
case MBFORMAT:
snprintf(strvalue, 7, "%*.1lfM%s",
basewidth-1, (double)((double)value/ONEMBYTE), suffix);
break;
case MBFORMAT_INT:
snprintf(strvalue, 7, "%*lldM%s",
basewidth-1, llround((double)((double)value/ONEMBYTE)), suffix);
break;
case GBFORMAT:
snprintf(strvalue, 7, "%*.1lfG%s",
basewidth-1, (double)((double)value/ONEGBYTE), suffix);
break;
case GBFORMAT_INT:
snprintf(strvalue, 7, "%*lldG%s",
basewidth-1, llround((double)((double)value/ONEGBYTE)), suffix);
break;
case TBFORMAT:
snprintf(strvalue, 7, "%*.1lfT%s",
basewidth-1, (double)((double)value/ONETBYTE), suffix);
break;
case TBFORMAT_INT:
snprintf(strvalue, 7, "%*lldT%s",
basewidth-1, llround((double)((double)value/ONETBYTE)), suffix);
break;
case PBFORMAT:
snprintf(strvalue, 7, "%*.1lfP%s",
basewidth-1, (double)((double)value/ONEPBYTE), suffix);
break;
case PBFORMAT_INT:
snprintf(strvalue, 7, "%*lldP%s",
basewidth-1, llround((double)((double)value/ONEPBYTE)), suffix);
break;
case EBFORMAT:
snprintf(strvalue, 7, "%*.1lfE%s",
basewidth-1, (double)((double)value/ONEEBYTE), suffix);
break;
default:
snprintf(strvalue, 7, "OVFLOW");
}
// check if overflow occurred during the formatting
// by checking the last byte of the formatted string
//
switch ( *(strvalue+5) )
{
case 's': // in case of per-second value
case 'B':
case 'K':
case 'M':
case 'G':
case 'T':
case 'P':
case 'E':
break;
default:
snprintf(strvalue, 7, "OVFLOW");
}
return strvalue;
}
/*
** Function numeric() checks if the ascii-string contains
** a numeric (positive) value.
** Returns 1 (true) if so, or 0 (false).
*/
int
numeric(char *ns)
{
register char *s = ns;
while (*s)
if (*s < '0' || *s > '9')
return(0); /* false */
else
s++;
return(1); /* true */
}
/*
** Function getboot() returns the boot-time of this system
** as number of jiffies since 1-1-1970.
*/
unsigned long long
getboot(void)
{
static unsigned long long boottime;
if (!boottime) /* do this only once */
boottime = getbootlinux(hertz);
return boottime;
}
/*
** LINUX SPECIFIC:
** Determine boot-time of this system (as number of jiffies since 1-1-1970).
*/
static unsigned long long
getbootlinux(long hertz)
{
int cpid;
char tmpbuf[1280];
FILE *fp;
unsigned long startticks;
unsigned long long bootjiffies = 0;
struct timespec ts;
/*
** dirty hack to get the boottime, since the
** Linux 2.6 kernel (2.6.5) does not return a proper
** boottime-value with the times() system call :-(
*/
if ( (cpid = fork()) == 0 )
{
/*
** child just waiting to be killed by parent
*/
pause();
}
else
{
/*
** parent determines start-time (in jiffies since boot)
** of the child and calculates the boottime in jiffies
** since 1-1-1970
*/
(void) clock_gettime(CLOCK_REALTIME, &ts); // get current
bootjiffies = 1LL * ts.tv_sec * hertz +
1LL * ts.tv_nsec * hertz / 1000000000LL;
snprintf(tmpbuf, sizeof tmpbuf, "/proc/%d/stat", cpid);
if ( (fp = fopen(tmpbuf, "r")) != NULL)
{
if ( fscanf(fp, "%*d (%*[^)]) %*c %*d %*d %*d %*d "
"%*d %*d %*d %*d %*d %*d %*d %*d "
"%*d %*d %*d %*d %*d %*d %lu",
&startticks) == 1)
{
bootjiffies -= startticks;
}
fclose(fp);
}
/*
** kill the child and get rid of the zombie
*/
kill(cpid, SIGKILL);
(void) wait((int *)0);
}
return bootjiffies;
}
/*
** generic pointer verification after malloc
*/
void
ptrverify(const void *ptr, const char *errormsg, ...)
{
if (!ptr)
{
va_list args;
acctswoff();
netatop_signoff();
if (vis.show_end)
(vis.show_end)();
va_start(args, errormsg);
vfprintf(stderr, errormsg, args);
va_end(args);
exit(13);
}
}
/*
** cleanup, give error message and exit
*/
void
mcleanstop(int exitcode, const char *errormsg, ...)
{
va_list args;
acctswoff();
netatop_signoff();
(vis.show_end)();
va_start(args, errormsg);
vfprintf(stderr, errormsg, args);
va_end(args);
exit(exitcode);
}
/*
** cleanup and exit
*/
void
cleanstop(int exitcode)
{
acctswoff();
netatop_signoff();
(vis.show_end)();
exit(exitcode);
}
/*
** determine if we are running with root privileges
** returns: boolean
*/
int
rootprivs(void)
{
uid_t ruid, euid, suid;
getresuid(&ruid, &euid, &suid);
return !suid;
}
/*
** drop the root privileges that might be obtained via setuid-bit
**
** this action may only fail with errno EPERM (normal situation when
** atop has not been started with setuid-root privs); when this
** action fails with EAGAIN or ENOMEM, atop should not continue
** without root privs being dropped...
*/
int
droprootprivs(void)
{
if (seteuid( getuid() ) == -1 && errno != EPERM)
return 0; /* false */
else
return 1; /* true */
}
/*
** regain the root privileges that might be dropped earlier
*/
void
regainrootprivs(void)
{
int liResult;
// this will fail for non-privileged processes
liResult = seteuid(0);
if (liResult != 0)
{
}
}
/*
** try to set the highest OOM priority
*/
void
set_oom_score_adj(void)
{
int fd;
char val[] = "-999"; /* suggested by Gerlof, always set -999 */
/*
** set OOM score adj to avoid to lost necessary log of system.
** ignored if not running under superuser privileges!
*/
fd = open("/proc/self/oom_score_adj", O_RDWR);
if ( fd < 0 ) {
return;
}
if ( write(fd, val, strlen(val)) < 0 )
;
close(fd);
}
/* hypervisor enum, move this into header if actually in use */
enum {
HYPER_NONE = 0,
HYPER_XEN,
HYPER_KVM,
HYPER_MSHV,
HYPER_VMWARE,
HYPER_IBM,
HYPER_VSERVER,
HYPER_UML,
HYPER_INNOTEK,
HYPER_HITACHI,
HYPER_PARALLELS,
HYPER_VBOX,
HYPER_OS400,
HYPER_PHYP,
HYPER_SPAR,
HYPER_WSL,
};
#if defined(__x86_64__) || defined(__i386__)
#define HYPERVISOR_INFO_LEAF 0x40000000
static inline void
x86_cpuid(unsigned int op, unsigned int *eax, unsigned int *ebx,
unsigned int *ecx, unsigned int *edx)
{
__asm__(
#if defined(__PIC__) && defined(__i386__)
"xchg %%ebx, %%esi;"
"cpuid;"
"xchg %%esi, %%ebx;"
: "=S" (*ebx),
#else
"cpuid;"
: "=b" (*ebx),
#endif
"=a" (*eax),
"=c" (*ecx),
"=d" (*edx)
: "1" (op), "c"(0));
}
static int
get_hypervisor(void)
{
unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0, hyper = HYPER_NONE;
char hyper_vendor_id[13];
memset(hyper_vendor_id, 0, sizeof(hyper_vendor_id));
x86_cpuid(HYPERVISOR_INFO_LEAF, &eax, &ebx, &ecx, &edx);
memcpy(hyper_vendor_id + 0, &ebx, 4);
memcpy(hyper_vendor_id + 4, &ecx, 4);
memcpy(hyper_vendor_id + 8, &edx, 4);
hyper_vendor_id[12] = '\0';
if (!hyper_vendor_id[0])
return hyper;