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/*
htop - darwin/PlatformHelpers.c
(C) 2018 Pierre Malhaire, 2020-2021 htop dev team, 2021 Alexander Momchilov
Released under the GNU GPLv2+, see the COPYING file
in the source distribution for its full text.
*/
#include "darwin/PlatformHelpers.h"
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/sysctl.h>
#include "CRT.h"
#ifdef HAVE_MACH_MACH_TIME_H
#include <mach/mach_time.h>
#endif
void Platform_GetKernelVersion(KernelVersion* k) {
static KernelVersion cachedKernelVersion;
if (!cachedKernelVersion.major) {
// just in case it fails someday
cachedKernelVersion = (KernelVersion) { -1, -1, -1 };
char str[256] = {0};
size_t size = sizeof(str);
int ret = sysctlbyname("kern.osrelease", str, &size, NULL, 0);
if (ret == 0) {
sscanf(str, "%hd.%hd.%hd", &cachedKernelVersion.major, &cachedKernelVersion.minor, &cachedKernelVersion.patch);
}
}
memcpy(k, &cachedKernelVersion, sizeof(cachedKernelVersion));
}
int Platform_CompareKernelVersion(KernelVersion v) {
struct KernelVersion actualVersion;
Platform_GetKernelVersion(&actualVersion);
if (actualVersion.major != v.major) {
return actualVersion.major - v.major;
}
if (actualVersion.minor != v.minor) {
return actualVersion.minor - v.minor;
}
if (actualVersion.patch != v.patch) {
return actualVersion.patch - v.patch;
}
return 0;
}
bool Platform_KernelVersionIsBetween(KernelVersion lowerBound, KernelVersion upperBound) {
return 0 <= Platform_CompareKernelVersion(lowerBound)
&& Platform_CompareKernelVersion(upperBound) < 0;
}
void Platform_getCPUBrandString(char* cpuBrandString, size_t cpuBrandStringSize) {
if (sysctlbyname("machdep.cpu.brand_string", cpuBrandString, &cpuBrandStringSize, NULL, 0) == -1) {
fprintf(stderr,
"WARN: Unable to determine the CPU brand string.\n"
"errno: %i, %s\n", errno, strerror(errno));
String_safeStrncpy(cpuBrandString, "UNKNOWN!", cpuBrandStringSize);
}
}
// Adapted from https://developer.apple.com/documentation/apple-silicon/about-the-rosetta-translation-environment
bool Platform_isRunningTranslated(void) {
int ret = 0;
size_t size = sizeof(ret);
errno = 0;
if (sysctlbyname("sysctl.proc_translated", &ret, &size, NULL, 0) == -1) {
if (errno == ENOENT)
return false;
fprintf(stderr,
"WARN: Could not determine if this process was running in a translation environment like Rosetta 2.\n"
"Assuming that we're not.\n"
"errno: %i, %s\n", errno, strerror(errno));
return false;
}
return ret;
}
double Platform_calculateNanosecondsPerMachTick(void) {
// Check if we can determine the timebase used on this system.
// If the API is unavailable assume we get our timebase in nanoseconds.
#ifndef HAVE_MACH_TIMEBASE_INFO
return 1.0;
#else
mach_timebase_info_data_t info;
/* WORKAROUND for `mach_timebase_info` giving incorrect values on M1 under Rosetta 2.
* rdar://FB9546856 https://openradar.appspot.com/radar?id=5055988478509056
*
* We don't know exactly what feature/attribute of the M1 chip causes this mistake under Rosetta 2.
* Until we have more Apple ARM chips to compare against, the best we can do is special-case
* the "Apple M1" chip specifically when running under Rosetta 2.
*/
char cpuBrandString[1024] = "";
Platform_getCPUBrandString(cpuBrandString, sizeof(cpuBrandString));
bool isRunningUnderRosetta2 = Platform_isRunningTranslated();
// Kernel version 20.0.0 is macOS 11.0 (Big Sur)
bool isBuggedVersion = Platform_KernelVersionIsBetween((KernelVersion) {20, 0, 0}, (KernelVersion) {999, 999, 999});
if (isRunningUnderRosetta2 && String_eq(cpuBrandString, "Apple M1") && isBuggedVersion) {
// In this case `mach_timebase_info` provides the wrong value, so we hard-code the correct factor,
// as determined from `mach_timebase_info` when the process running natively.
info = (mach_timebase_info_data_t) { .numer = 125, .denom = 3 };
} else {
// No workarounds needed, use the OS-provided value.
mach_timebase_info(&info);
}
return (double)info.numer / (double)info.denom;
#endif
}
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