Make Nix builds work

1 files changed, 51 insertions, 0 deletions

diff --git a/vendor/golang.org/x/sys/unix/sysvshm_unix.go b/vendor/golang.org/x/sys/unix/sysvshm_unix.go
new file mode 100644
index 0000000..79a84f1
--- /dev/null
+++ b/vendor/golang.org/x/sys/unix/sysvshm_unix.go
@@ -0,0 +1,51 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (darwin && !ios) || linux
+
+package unix
+
+import "unsafe"
+
+// SysvShmAttach attaches the Sysv shared memory segment associated with the
+// shared memory identifier id.
+func SysvShmAttach(id int, addr uintptr, flag int) ([]byte, error) {
+        addr, errno := shmat(id, addr, flag)
+        if errno != nil {
+                return nil, errno
+        }
+
+        // Retrieve the size of the shared memory to enable slice creation
+        var info SysvShmDesc
+
+        _, err := SysvShmCtl(id, IPC_STAT, &info)
+        if err != nil {
+                // release the shared memory if we can't find the size
+
+                // ignoring error from shmdt as there's nothing sensible to return here
+                shmdt(addr)
+                return nil, err
+        }
+
+        // Use unsafe to convert addr into a []byte.
+        b := unsafe.Slice((*byte)(unsafe.Pointer(addr)), int(info.Segsz))
+        return b, nil
+}
+
+// SysvShmDetach unmaps the shared memory slice returned from SysvShmAttach.
+//
+// It is not safe to use the slice after calling this function.
+func SysvShmDetach(data []byte) error {
+        if len(data) == 0 {
+                return EINVAL
+        }
+
+        return shmdt(uintptr(unsafe.Pointer(&data[0])))
+}
+
+// SysvShmGet returns the Sysv shared memory identifier associated with key.
+// If the IPC_CREAT flag is specified a new segment is created.
+func SysvShmGet(key, size, flag int) (id int, err error) {
+        return shmget(key, size, flag)
+}