Implement statx.

We don't have the plumbing for btime yet, so that field is left off. The
returned mask indicates that btime is absent.

Fixes #343

PiperOrigin-RevId: 254575752

2 files changed, 66 insertions, 0 deletions

diff --git a/pkg/abi/linux/file.go b/pkg/abi/linux/file.go
index c3301f7c5..426003eb7 100644
--- a/pkg/abi/linux/file.go
+++ b/pkg/abi/linux/file.go
@@ -181,6 +181,57 @@ type Stat struct {
 // SizeOfStat is the size of a Stat struct.
 var SizeOfStat = binary.Size(Stat{})
 
+// Flags for statx.
+const (
+	AT_STATX_SYNC_TYPE    = 0x6000
+	AT_STATX_SYNC_AS_STAT = 0x0000
+	AT_STATX_FORCE_SYNC   = 0x2000
+	AT_STATX_DONT_SYNC    = 0x4000
+)
+
+// Mask values for statx.
+const (
+	STATX_TYPE        = 0x00000001
+	STATX_MODE        = 0x00000002
+	STATX_NLINK       = 0x00000004
+	STATX_UID         = 0x00000008
+	STATX_GID         = 0x00000010
+	STATX_ATIME       = 0x00000020
+	STATX_MTIME       = 0x00000040
+	STATX_CTIME       = 0x00000080
+	STATX_INO         = 0x00000100
+	STATX_SIZE        = 0x00000200
+	STATX_BLOCKS      = 0x00000400
+	STATX_BASIC_STATS = 0x000007ff
+	STATX_BTIME       = 0x00000800
+	STATX_ALL         = 0x00000fff
+	STATX__RESERVED   = 0x80000000
+)
+
+// Statx represents struct statx.
+type Statx struct {
+	Mask           uint32
+	Blksize        uint32
+	Attributes     uint64
+	Nlink          uint32
+	UID            uint32
+	GID            uint32
+	Mode           uint16
+	_              uint16
+	Ino            uint64
+	Size           uint64
+	Blocks         uint64
+	AttributesMask uint64
+	Atime          StatxTimestamp
+	Btime          StatxTimestamp
+	Ctime          StatxTimestamp
+	Mtime          StatxTimestamp
+	RdevMajor      uint32
+	RdevMinor      uint32
+	DevMajor       uint32
+	DevMinor       uint32
+}
+
 // FileMode represents a mode_t.
 type FileMode uint
 
diff --git a/pkg/abi/linux/time.go b/pkg/abi/linux/time.go
index fa9ee27e1..e727066d7 100644
--- a/pkg/abi/linux/time.go
+++ b/pkg/abi/linux/time.go
@@ -226,3 +226,18 @@ type Tms struct {
 // TimerID represents type timer_t, which identifies a POSIX per-process
 // interval timer.
 type TimerID int32
+
+// StatxTimestamp represents struct statx_timestamp.
+type StatxTimestamp struct {
+	Sec  int64
+	Nsec uint32
+	_    int32
+}
+
+// NsecToStatxTimestamp translates nanoseconds to StatxTimestamp.
+func NsecToStatxTimestamp(nsec int64) (ts StatxTimestamp) {
+	return StatxTimestamp{
+		Sec:  nsec / 1e9,
+		Nsec: uint32(nsec % 1e9),
+	}
+}