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Merge pull request #497 from newrelic/develop
Release v3.16.0
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,35 @@ | ||
// Copyright 2020 New Relic Corporation. All rights reserved. | ||
// SPDX-License-Identifier: Apache-2.0 | ||
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package sysinfo | ||
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import ( | ||
"syscall" | ||
"unsafe" | ||
) | ||
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// PhysicalMemoryBytes returns the total amount of host memory. | ||
func PhysicalMemoryBytes() (uint64, error) { | ||
mib := []int32{6 /* CTL_HW */, 19 /* HW_PHYSMEM64 */} | ||
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buf := make([]byte, 8) | ||
bufLen := uintptr(8) | ||
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_, _, e1 := syscall.Syscall6(syscall.SYS___SYSCTL, | ||
uintptr(unsafe.Pointer(&mib[0])), uintptr(len(mib)), | ||
uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&bufLen)), | ||
uintptr(0), uintptr(0)) | ||
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if e1 != 0 { | ||
return 0, e1 | ||
} | ||
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switch bufLen { | ||
case 4: | ||
return uint64(*(*uint32)(unsafe.Pointer(&buf[0]))), nil | ||
case 8: | ||
return *(*uint64)(unsafe.Pointer(&buf[0])), nil | ||
default: | ||
return 0, syscall.EIO | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,49 @@ | ||
// Copyright 2020 New Relic Corporation. All rights reserved. | ||
// SPDX-License-Identifier: Apache-2.0 | ||
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package sysinfo | ||
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import ( | ||
"errors" | ||
"os/exec" | ||
"regexp" | ||
"strconv" | ||
"testing" | ||
) | ||
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var re = regexp.MustCompile(`hw\.physmem=(\d+)`) | ||
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func openbsdSysctlMemoryBytes() (uint64, error) { | ||
out, err := exec.Command("/sbin/sysctl", "hw.physmem").Output() | ||
if err != nil { | ||
return 0, err | ||
} | ||
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match := re.FindSubmatch(out) | ||
if match == nil { | ||
return 0, errors.New("memory size not found in sysctl output") | ||
} | ||
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bts, err := strconv.ParseUint(string(match[1]), 10, 64) | ||
if err != nil { | ||
return 0, err | ||
} | ||
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return bts, nil | ||
} | ||
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func TestPhysicalMemoryBytes(t *testing.T) { | ||
mem, err := PhysicalMemoryBytes() | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
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mem2, err := openbsdSysctlMemoryBytes() | ||
if nil != err { | ||
t.Fatal(err) | ||
} | ||
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if mem != mem2 { | ||
t.Errorf("Expected %d, got %d\n", mem2, mem) | ||
} | ||
} |
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