snapshot: sagernet/gvisor v0.0.0-20250811.0-sing-box-mod.1

Содержимое пина, зафиксированного в go.mod sing-box-lx, одним коммитом
без истории. Полная история SagerNet/gvisor — 1.45 ГБ и клонируется в
каждой CI-джобе; наша дельта — одна вставка в одну функцию, история для
неё не нужна.

Module path github.com/sagernet/gvisor сохранён намеренно: на него
опирается replace-директива суперпроекта.

Патч поверх — отдельным коммитом, чтобы дельта читалась одним git show
и переносилась на новый пин копированием.

SPECS/TASKS/048-GVISOR_HANDSHAKE_NIL_CRASH

pkg/abi/linux/sem.go

@@ -0,0 +1,82 @@
+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package linux
+
+// semctl Command Definitions. Source: include/uapi/linux/sem.h
+const (
+	GETPID  = 11
+	GETVAL  = 12
+	GETALL  = 13
+	GETNCNT = 14
+	GETZCNT = 15
+	SETVAL  = 16
+	SETALL  = 17
+)
+
+// ipcs ctl cmds. Source: include/uapi/linux/sem.h
+const (
+	SEM_STAT     = 18
+	SEM_INFO     = 19
+	SEM_STAT_ANY = 20
+)
+
+// Information about system-wide semaphore limits and parameters.
+//
+// Source: include/uapi/linux/sem.h
+const (
+	SEMMNI = 32000
+	SEMMSL = 32000
+	SEMMNS = SEMMNI * SEMMSL
+	SEMOPM = 500
+	SEMVMX = 32767
+	SEMAEM = SEMVMX
+
+	SEMUME = SEMOPM
+	SEMMNU = SEMMNS
+	SEMMAP = SEMMNS
+	SEMUSZ = 20
+)
+
+// Semaphore flags.
+const (
+	SEM_UNDO = 0x1000
+)
+
+// Sembuf is equivalent to struct sembuf.
+//
+// +marshal slice:SembufSlice
+type Sembuf struct {
+	SemNum uint16
+	SemOp  int16
+	SemFlg int16
+}
+
+// SemInfo is equivalent to struct seminfo.
+//
+// Source: include/uapi/linux/sem.h
+//
+// +marshal
+type SemInfo struct {
+	SemMap uint32
+	SemMni uint32
+	SemMns uint32
+	SemMnu uint32
+	SemMsl uint32
+	SemOpm uint32
+	SemUme uint32
+	SemUsz uint32
+	SemVmx uint32
+	SemAem uint32
+}