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-rw-r--r--internal/syscallcompat/sys_common.go23
1 files changed, 23 insertions, 0 deletions
diff --git a/internal/syscallcompat/sys_common.go b/internal/syscallcompat/sys_common.go
index 4ce0208..a1aa66d 100644
--- a/internal/syscallcompat/sys_common.go
+++ b/internal/syscallcompat/sys_common.go
@@ -84,6 +84,29 @@ func Fgetxattr(fd int, attr string) (val []byte, err error) {
return val, nil
}
+// Lgetxattr is a wrapper around unix.Lgetxattr that handles the buffer sizing.
+func Lgetxattr(path string, attr string) (val []byte, err error) {
+ // See the buffer sizing comments in Fgetxattr.
+ // TODO: smarter buffer sizing?
+ buf := make([]byte, XATTR_BUFSZ)
+ sz, err := unix.Lgetxattr(path, attr, buf)
+ if err == syscall.ERANGE {
+ // Do NOT return ERANGE - the user might retry ad inifinitum!
+ return nil, syscall.EOVERFLOW
+ }
+ if err != nil {
+ return nil, err
+ }
+ if sz >= XATTR_SIZE_MAX {
+ return nil, syscall.EOVERFLOW
+ }
+ // Copy only the actually used bytes to a new (smaller) buffer
+ // so "buf" never leaves the function and can be allocated on the stack.
+ val = make([]byte, sz)
+ copy(val, buf)
+ return val, nil
+}
+
// Flistxattr is a wrapper for unix.Flistxattr that handles buffer sizing and
// parsing the returned blob to a string slice.
func Flistxattr(fd int) (attrs []string, err error) {