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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019-2020 WireGuard LLC. All Rights Reserved.
*/
package ringlogger
import (
"log"
"path/filepath"
"unsafe"
"golang.zx2c4.com/wireguard/windows/conf"
)
var Global *Ringlogger
func InitGlobalLogger(tag string) error {
if Global != nil {
return nil
}
root, err := conf.RootDirectory(true)
if err != nil {
return err
}
Global, err = NewRinglogger(filepath.Join(root, "log.bin"), tag)
if err != nil {
return err
}
log.SetOutput(Global)
log.SetFlags(0)
overrideWrite = globalWrite
return nil
}
//go:linkname overrideWrite runtime.overrideWrite
var overrideWrite func(fd uintptr, p unsafe.Pointer, n int32) int32
var globalBuffer [maxLogLineLength - 1 - maxTagLength - 3]byte
var globalBufferLocation int
//go:nosplit
func globalWrite(fd uintptr, p unsafe.Pointer, n int32) int32 {
b := (*[1 << 30]byte)(p)[:n]
for len(b) > 0 {
amountAvailable := len(globalBuffer) - globalBufferLocation
amountToCopy := len(b)
if amountToCopy > amountAvailable {
amountToCopy = amountAvailable
}
copy(globalBuffer[globalBufferLocation:], b[:amountToCopy])
b = b[amountToCopy:]
globalBufferLocation += amountToCopy
foundNl := false
for i := globalBufferLocation - amountToCopy; i < globalBufferLocation; i++ {
if globalBuffer[i] == '\n' {
foundNl = true
break
}
}
if foundNl || len(b) > 0 {
Global.Write(globalBuffer[:globalBufferLocation])
globalBufferLocation = 0
}
}
return n
}
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