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Make comments clearer for control message handling.

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PiperOrigin-RevId: 284791600
This commit is contained in:
Dean Deng
2019-12-10 10:01:06 -08:00
committed by gVisor bot
parent aadbf322c6
commit 30f7316dc4
1 changed files with 6 additions and 6 deletions
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pkg/sentry/socket/control/control.go
+6 -6
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@@ -195,15 +195,15 @@ func putCmsg(buf []byte, flags int, msgType uint32, align uint, data []int32) ([
// the available space, we must align down.
//
// align must be >= 4 and each data int32 is 4 bytes. The length of the
// header is already aligned, so if we align to the with of the data there
// header is already aligned, so if we align to the width of the data there
// are two cases:
// 1. The aligned length is less than the length of the header. The
// unaligned length was also less than the length of the header, so we
// can't write anything.
// 2. The aligned length is greater than or equal to the length of the
// header. We can write the header plus zero or more datas. We can't write
// a partial int32, so the length of the message will be
// min(aligned length, header + datas).
// header. We can write the header plus zero or more bytes of data. We can't
// write a partial int32, so the length of the message will be
// min(aligned length, header + data).
if space < linux.SizeOfControlMessageHeader {
flags |= linux.MSG_CTRUNC
return buf, flags
@@ -240,12 +240,12 @@ func putCmsgStruct(buf []byte, msgLevel, msgType uint32, align uint, data interf
buf = binary.Marshal(buf, usermem.ByteOrder, data)
// Check if we went over.
// If the control message data brought us over capacity, omit it.
if cap(buf) != cap(ob) {
return hdrBuf
}
// Fix up length.
// Update control message length to include data.
putUint64(ob, uint64(len(buf)-len(ob)))
return alignSlice(buf, align)