MAP_PRIVATE                     = 0x1 // changes are private
	MAP_SHARED                      = 0x2 // changes are shared
	MAP_FIXED                       = 0x4 // place exactly
	__MAP_MEGA                      = 0x8
	__MAP_64                        = 0x10
	MAP_ANON                        = 0x20
	MAP_ANONYMOUS                   = 0x20
	MS_SYNC                         = 0x1 // msync - synchronous writes

		case runtime.GOOS == "dragonfly":
			t.Skip("see golang.org/issue/11990")
		case runtime.GOOS == "linux" && runtime.GOARCH == "arm":
			t.Skip("too slow for arm builders")
		case runtime.GOOS == "linux" && (runtime.GOARCH == "mips64" || runtime.GOARCH == "mips64le"):
			t.Skip("too slow for mips64x builders")
		}
	}
	if testenv.Builder() == "darwin-amd64-10_14" {
		// TODO(#23011): When the 10.14 builders are gone, remove this skip.

				// instruction).
				deferreturn = uint32(r.Off())
				switch target.Arch.Family {
				case sys.AMD64, sys.I386:
					deferreturn--
				case sys.ARM, sys.ARM64, sys.Loong64, sys.MIPS, sys.MIPS64, sys.PPC64, sys.RISCV64:
					// no change
				case sys.S390X:
					deferreturn -= 2
				default:
					panic(fmt.Sprint("Unhandled architecture:", target.Arch.Family))
				}
			}
			break // only need one

//go:cgo_import_dynamic libc_umount umount "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_getrlimit getrlimit "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_lseek lseek "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_mmap64 mmap64 "libc.a/shr_64.o"

//go:linkname libc_utimes libc_utimes
//go:linkname libc_utimensat libc_utimensat
//go:linkname libc_getcwd libc_getcwd
//go:linkname libc_accept libc_accept