diff options
Diffstat (limited to 'pkg/abi/linux/linux_amd64_abi_autogen_unsafe.go')
-rwxr-xr-x | pkg/abi/linux/linux_amd64_abi_autogen_unsafe.go | 36 |
1 files changed, 34 insertions, 2 deletions
diff --git a/pkg/abi/linux/linux_amd64_abi_autogen_unsafe.go b/pkg/abi/linux/linux_amd64_abi_autogen_unsafe.go index 1fdf61fa0..226b5db1c 100755 --- a/pkg/abi/linux/linux_amd64_abi_autogen_unsafe.go +++ b/pkg/abi/linux/linux_amd64_abi_autogen_unsafe.go @@ -8,6 +8,7 @@ import ( "gvisor.dev/gvisor/pkg/safecopy" "gvisor.dev/gvisor/pkg/usermem" "gvisor.dev/gvisor/tools/go_marshal/marshal" + "io" "reflect" "runtime" "unsafe" @@ -95,7 +96,7 @@ func (s *Stat) UnmarshalBytes(src []byte) { // Packed implements marshal.Marshallable.Packed. func (s *Stat) Packed() bool { - return s.ATime.Packed() && s.MTime.Packed() && s.CTime.Packed() + return s.MTime.Packed() && s.CTime.Packed() && s.ATime.Packed() } // MarshalUnsafe implements marshal.Marshallable.MarshalUnsafe. @@ -118,7 +119,7 @@ func (s *Stat) UnmarshalUnsafe(src []byte) { // CopyOut implements marshal.Marshallable.CopyOut. func (s *Stat) CopyOut(task marshal.Task, addr usermem.Addr) (int, error) { - if !s.ATime.Packed() && s.MTime.Packed() && s.CTime.Packed() { + if !s.CTime.Packed() && s.ATime.Packed() && s.MTime.Packed() { // Type Stat doesn't have a packed layout in memory, fall back to MarshalBytes. buf := task.CopyScratchBuffer(s.SizeBytes()) s.MarshalBytes(buf) @@ -180,3 +181,34 @@ func (s *Stat) CopyIn(task marshal.Task, addr usermem.Addr) (int, error) { return len, err } +// WriteTo implements io.WriterTo.WriteTo. +func (s *Stat) WriteTo(w io.Writer) (int64, error) { + if !s.ATime.Packed() && s.MTime.Packed() && s.CTime.Packed() { + // Type Stat doesn't have a packed layout in memory, fall back to MarshalBytes. + buf := make([]byte, s.SizeBytes()) + s.MarshalBytes(buf) + n, err := w.Write(buf) + return int64(n), err + } + + // Bypass escape analysis on s. The no-op arithmetic operation on the + // pointer makes the compiler think val doesn't depend on s. + // See src/runtime/stubs.go:noescape() in the golang toolchain. + ptr := unsafe.Pointer(s) + val := uintptr(ptr) + val = val^0 + + // Construct a slice backed by s's underlying memory. + var buf []byte + hdr := (*reflect.SliceHeader)(unsafe.Pointer(&buf)) + hdr.Data = val + hdr.Len = s.SizeBytes() + hdr.Cap = s.SizeBytes() + + len, err := w.Write(buf) + // Since we bypassed the compiler's escape analysis, indicate that s + // must live until after the Write. + runtime.KeepAlive(s) + return int64(len), err +} + |