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windows: add accessor for duration since boot

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In order to deal with boot time race conditions, sometimes it is
useful to determine the time since boot.

Change-Id: Ibc907b49a9b072b3ef3b6c94eec7e2e6428943ba
Reviewed-on: https://go-review.googlesource.com/c/sys/+/180899
Run-TryBot: Jason Donenfeld <Jason@zx2c4.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matt Layher <mdlayher@gmail.com>
This commit is contained in:
Jason A. Donenfeld
2019-06-06 15:35:02 +02:00
committed by Matt Layher
parent 79a91cf218
commit 5da285871e
2 changed files with 13 additions and 0 deletions
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6
windows/syscall_windows.go
View File

@@ -10,6 +10,7 @@ import (
errorspkg "errors"
"sync"
"syscall"
"time"
"unicode/utf16"
"unsafe"
)
@@ -194,6 +195,7 @@ func NewCallbackCDecl(fn interface{}) uintptr {
//sys SetEnvironmentVariable(name *uint16, value *uint16) (err error) = kernel32.SetEnvironmentVariableW
//sys CreateEnvironmentBlock(block **uint16, token Token, inheritExisting bool) (err error) = userenv.CreateEnvironmentBlock
//sys DestroyEnvironmentBlock(block *uint16) (err error) = userenv.DestroyEnvironmentBlock
//sys getTickCount64() (ms uint64) = kernel32.GetTickCount64
//sys SetFileTime(handle Handle, ctime *Filetime, atime *Filetime, wtime *Filetime) (err error)
//sys GetFileAttributes(name *uint16) (attrs uint32, err error) [failretval==INVALID_FILE_ATTRIBUTES] = kernel32.GetFileAttributesW
//sys SetFileAttributes(name *uint16, attrs uint32) (err error) = kernel32.SetFileAttributesW
@@ -498,6 +500,10 @@ func ComputerName() (name string, err error) {
return string(utf16.Decode(b[0:n])), nil
}
func DurationSinceBoot() time.Duration {
return time.Duration(getTickCount64()) * time.Millisecond
}
func Ftruncate(fd Handle, length int64) (err error) {
curoffset, e := Seek(fd, 0, 1)
if e != nil {

7
windows/zsyscall_windows.go
View File

@@ -133,6 +133,7 @@ var (
procSetEnvironmentVariableW = modkernel32.NewProc("SetEnvironmentVariableW")
procCreateEnvironmentBlock = moduserenv.NewProc("CreateEnvironmentBlock")
procDestroyEnvironmentBlock = moduserenv.NewProc("DestroyEnvironmentBlock")
procGetTickCount64 = modkernel32.NewProc("GetTickCount64")
procSetFileTime = modkernel32.NewProc("SetFileTime")
procGetFileAttributesW = modkernel32.NewProc("GetFileAttributesW")
procSetFileAttributesW = modkernel32.NewProc("SetFileAttributesW")
@@ -1373,6 +1374,12 @@ func DestroyEnvironmentBlock(block *uint16) (err error) {
return
}
func getTickCount64() (ms uint64) {
r0, _, _ := syscall.Syscall(procGetTickCount64.Addr(), 0, 0, 0, 0)
ms = uint64(r0)
return
}
func SetFileTime(handle Handle, ctime *Filetime, atime *Filetime, wtime *Filetime) (err error) {
r1, _, e1 := syscall.Syscall6(procSetFileTime.Addr(), 4, uintptr(handle), uintptr(unsafe.Pointer(ctime)), uintptr(unsafe.Pointer(atime)), uintptr(unsafe.Pointer(wtime)), 0, 0)
if r1 == 0 {