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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
new file mode 100644
index 0000000..440b42f
--- /dev/null
+++ b/internal/syscallcompat/sys_common.go
@@ -0,0 +1,23 @@
+package syscallcompat
+
+import (
+ "golang.org/x/sys/unix"
+)
+
+// Readlinkat exists both in Linux and in MacOS 10.10+. We may add an
+// emulated version for users on older MacOS versions if there is
+// demand.
+// Buffer allocation is handled internally, unlike the bare unix.Readlinkat.
+func Readlinkat(dirfd int, path string) (string, error) {
+ // Allocate the buffer exponentially like os.Readlink does.
+ for bufsz := 128; ; bufsz *= 2 {
+ buf := make([]byte, bufsz)
+ n, err := unix.Readlinkat(dirfd, path, buf)
+ if err != nil {
+ return "", err
+ }
+ if n < bufsz {
+ return string(buf[0:n]), nil
+ }
+ }
+}