2c8b627008
Integers are for numbers, enabling arithmetic like subtractions and for loops without getting shot in the foot. Unsigneds are for bitfields. - "int" for numbers that will always be laughably smaller than four billion, and where we don't care about the serialization format. - "int32" for numbers that will always be laughably smaller than four billion, and will be serialized to four bytes. - "int64" for numbers that may approach four billion or will be serialized to eight bytes. - "uint32" and "uint64" for bitfields, depending on required number of bits and serialization format. Likewise "uint8" and "uint16", although rare in this project since they don't exist in XDR. - "int8", "int16" and plain "uint" are almost never useful.
41 lines
1.2 KiB
Go
41 lines
1.2 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This program is free software: you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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// more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program. If not, see <http://www.gnu.org/licenses/>.
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package main
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import (
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"encoding/binary"
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"syscall"
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"unsafe"
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)
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var (
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kernel32, _ = syscall.LoadLibrary("kernel32.dll")
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globalMemoryStatusEx, _ = syscall.GetProcAddress(kernel32, "GlobalMemoryStatusEx")
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)
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func memorySize() (int64, error) {
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var memoryStatusEx [64]byte
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binary.LittleEndian.PutUint32(memoryStatusEx[:], 64)
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p := uintptr(unsafe.Pointer(&memoryStatusEx[0]))
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ret, _, callErr := syscall.Syscall(uintptr(globalMemoryStatusEx), 1, p, 0, 0)
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if ret == 0 {
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return 0, callErr
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}
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return int64(binary.LittleEndian.Uint64(memoryStatusEx[8:])), nil
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}
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