Revert "runtime: move epoll syscalls to runtime/internal/syscall"

This reverts CL 421994.

Reason for revert: breaks runtime.TestCheckPtr2

For #53824
For #51087

Change-Id: I044ea4d6efdffe0a4b7fb0d2bb3717d9f391fc59
Reviewed-on: https://go-review.googlesource.com/c/go/+/437295
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>

41 files changed, 813 insertions, 411 deletions

diff --git a/src/runtime/defs2_linux.go b/src/runtime/defs2_linux.go
index 5d6730a7ad..41ad73576f 100644
--- a/src/runtime/defs2_linux.go
+++ b/src/runtime/defs2_linux.go
@@ -121,6 +121,17 @@ const (
 
 	O_RDONLY  = C.O_RDONLY
 	O_CLOEXEC = C.O_CLOEXEC
+
+	EPOLLIN       = C.POLLIN
+	EPOLLOUT      = C.POLLOUT
+	EPOLLERR      = C.POLLERR
+	EPOLLHUP      = C.POLLHUP
+	EPOLLRDHUP    = C.POLLRDHUP
+	EPOLLET       = C.EPOLLET
+	EPOLL_CLOEXEC = C.EPOLL_CLOEXEC
+	EPOLL_CTL_ADD = C.EPOLL_CTL_ADD
+	EPOLL_CTL_DEL = C.EPOLL_CTL_DEL
+	EPOLL_CTL_MOD = C.EPOLL_CTL_MOD
 )
 
 type Fpreg C.struct__fpreg
diff --git a/src/runtime/defs_linux.go b/src/runtime/defs_linux.go
index 296fcb4bfd..e55bb6bbbc 100644
--- a/src/runtime/defs_linux.go
+++ b/src/runtime/defs_linux.go
@@ -115,6 +115,17 @@ const (
 	CLOCK_THREAD_CPUTIME_ID = C.CLOCK_THREAD_CPUTIME_ID
 
 	SIGEV_THREAD_ID = C.SIGEV_THREAD_ID
+
+	EPOLLIN       = C.POLLIN
+	EPOLLOUT      = C.POLLOUT
+	EPOLLERR      = C.POLLERR
+	EPOLLHUP      = C.POLLHUP
+	EPOLLRDHUP    = C.POLLRDHUP
+	EPOLLET       = C.EPOLLET
+	EPOLL_CLOEXEC = C.EPOLL_CLOEXEC
+	EPOLL_CTL_ADD = C.EPOLL_CTL_ADD
+	EPOLL_CTL_DEL = C.EPOLL_CTL_DEL
+	EPOLL_CTL_MOD = C.EPOLL_CTL_MOD
 )
 
 type Sigset C.sigset_t
@@ -125,3 +136,4 @@ type Siginfo C.siginfo_t
 type Itimerspec C.struct_itimerspec
 type Itimerval C.struct_itimerval
 type Sigevent C.struct_sigevent
+type EpollEvent C.struct_epoll_event
diff --git a/src/runtime/defs_linux_386.go b/src/runtime/defs_linux_386.go
index 7027286f5c..5376bded2b 100644
--- a/src/runtime/defs_linux_386.go
+++ b/src/runtime/defs_linux_386.go
@@ -93,6 +93,17 @@ const (
 	_O_NONBLOCK = 0x800
 	_O_CLOEXEC  = 0x80000
 
+	_EPOLLIN       = 0x1
+	_EPOLLOUT      = 0x4
+	_EPOLLERR      = 0x8
+	_EPOLLHUP      = 0x10
+	_EPOLLRDHUP    = 0x2000
+	_EPOLLET       = 0x80000000
+	_EPOLL_CLOEXEC = 0x80000
+	_EPOLL_CTL_ADD = 0x1
+	_EPOLL_CTL_DEL = 0x2
+	_EPOLL_CTL_MOD = 0x3
+
 	_AF_UNIX    = 0x1
 	_SOCK_DGRAM = 0x2
 )
@@ -243,6 +254,11 @@ type sigevent struct {
 	_ [_sigev_max_size - unsafe.Sizeof(sigeventFields{})]byte
 }
 
+type epollevent struct {
+	events uint32
+	data   [8]byte // to match amd64
+}
+
 type sockaddr_un struct {
 	family uint16
 	path   [108]byte
diff --git a/src/runtime/defs_linux_amd64.go b/src/runtime/defs_linux_amd64.go
index 4ce6146177..da4d357532 100644
--- a/src/runtime/defs_linux_amd64.go
+++ b/src/runtime/defs_linux_amd64.go
@@ -89,6 +89,17 @@ const (
 
 	_SIGEV_THREAD_ID = 0x4
 
+	_EPOLLIN       = 0x1
+	_EPOLLOUT      = 0x4
+	_EPOLLERR      = 0x8
+	_EPOLLHUP      = 0x10
+	_EPOLLRDHUP    = 0x2000
+	_EPOLLET       = 0x80000000
+	_EPOLL_CLOEXEC = 0x80000
+	_EPOLL_CTL_ADD = 0x1
+	_EPOLL_CTL_DEL = 0x2
+	_EPOLL_CTL_MOD = 0x3
+
 	_AF_UNIX    = 0x1
 	_SOCK_DGRAM = 0x2
 )
@@ -160,6 +171,11 @@ type sigevent struct {
 	_ [_sigev_max_size - unsafe.Sizeof(sigeventFields{})]byte
 }
 
+type epollevent struct {
+	events uint32
+	data   [8]byte // unaligned uintptr
+}
+
 // created by cgo -cdefs and then converted to Go
 // cgo -cdefs defs_linux.go defs1_linux.go
 
diff --git a/src/runtime/defs_linux_arm.go b/src/runtime/defs_linux_arm.go
index 999c11431b..18aa0931e5 100644
--- a/src/runtime/defs_linux_arm.go
+++ b/src/runtime/defs_linux_arm.go
@@ -87,6 +87,17 @@ const (
 
 	_SIGEV_THREAD_ID = 0x4
 
+	_EPOLLIN       = 0x1
+	_EPOLLOUT      = 0x4
+	_EPOLLERR      = 0x8
+	_EPOLLHUP      = 0x10
+	_EPOLLRDHUP    = 0x2000
+	_EPOLLET       = 0x80000000
+	_EPOLL_CLOEXEC = 0x80000
+	_EPOLL_CTL_ADD = 0x1
+	_EPOLL_CTL_DEL = 0x2
+	_EPOLL_CTL_MOD = 0x3
+
 	_AF_UNIX    = 0x1
 	_SOCK_DGRAM = 0x2
 )
@@ -197,6 +208,12 @@ type sigactiont struct {
 	sa_mask     uint64
 }
 
+type epollevent struct {
+	events uint32
+	_pad   uint32
+	data   [8]byte // to match amd64
+}
+
 type sockaddr_un struct {
 	family uint16
 	path   [108]byte
diff --git a/src/runtime/defs_linux_arm64.go b/src/runtime/defs_linux_arm64.go
index 73f26a9b00..c5d7d7e3fd 100644
--- a/src/runtime/defs_linux_arm64.go
+++ b/src/runtime/defs_linux_arm64.go
@@ -89,6 +89,17 @@ const (
 
 	_SIGEV_THREAD_ID = 0x4
 
+	_EPOLLIN       = 0x1
+	_EPOLLOUT      = 0x4
+	_EPOLLERR      = 0x8
+	_EPOLLHUP      = 0x10
+	_EPOLLRDHUP    = 0x2000
+	_EPOLLET       = 0x80000000
+	_EPOLL_CLOEXEC = 0x80000
+	_EPOLL_CTL_ADD = 0x1
+	_EPOLL_CTL_DEL = 0x2
+	_EPOLL_CTL_MOD = 0x3
+
 	_AF_UNIX    = 0x1
 	_SOCK_DGRAM = 0x2
 )
@@ -160,6 +171,12 @@ type sigevent struct {
 	_ [_sigev_max_size - unsafe.Sizeof(sigeventFields{})]byte
 }
 
+type epollevent struct {
+	events uint32
+	_pad   uint32
+	data   [8]byte // to match amd64
+}
+
 // Created by cgo -cdefs and then converted to Go by hand
 // ../cmd/cgo/cgo -cdefs defs_linux.go defs1_linux.go defs2_linux.go
 
diff --git a/src/runtime/defs_linux_loong64.go b/src/runtime/defs_linux_loong64.go
index 956121d0fc..dda4009fb0 100644
--- a/src/runtime/defs_linux_loong64.go
+++ b/src/runtime/defs_linux_loong64.go
@@ -89,6 +89,17 @@ const (
 	_CLOCK_THREAD_CPUTIME_ID = 0x3
 
 	_SIGEV_THREAD_ID = 0x4
+
+	_EPOLLIN       = 0x1
+	_EPOLLOUT      = 0x4
+	_EPOLLERR      = 0x8
+	_EPOLLHUP      = 0x10
+	_EPOLLRDHUP    = 0x2000
+	_EPOLLET       = 0x80000000
+	_EPOLL_CLOEXEC = 0x80000
+	_EPOLL_CTL_ADD = 0x1
+	_EPOLL_CTL_DEL = 0x2
+	_EPOLL_CTL_MOD = 0x3
 )
 
 type timespec struct {
@@ -135,6 +146,12 @@ type sigevent struct {
 	_ [_sigev_max_size - unsafe.Sizeof(sigeventFields{})]byte
 }
 
+type epollevent struct {
+	events    uint32
+	pad_cgo_0 [4]byte
+	data      [8]byte // unaligned uintptr
+}
+
 const (
 	_O_RDONLY   = 0x0
 	_O_NONBLOCK = 0x800
diff --git a/src/runtime/defs_linux_mips64x.go b/src/runtime/defs_linux_mips64x.go
index 30157fa808..e645248131 100644
--- a/src/runtime/defs_linux_mips64x.go
+++ b/src/runtime/defs_linux_mips64x.go
@@ -90,6 +90,17 @@ const (
 	_CLOCK_THREAD_CPUTIME_ID = 0x3
 
 	_SIGEV_THREAD_ID = 0x4
+
+	_EPOLLIN       = 0x1
+	_EPOLLOUT      = 0x4
+	_EPOLLERR      = 0x8
+	_EPOLLHUP      = 0x10
+	_EPOLLRDHUP    = 0x2000
+	_EPOLLET       = 0x80000000
+	_EPOLL_CLOEXEC = 0x80000
+	_EPOLL_CTL_ADD = 0x1
+	_EPOLL_CTL_DEL = 0x2
+	_EPOLL_CTL_MOD = 0x3
 )
 
 //struct Sigset {
@@ -167,6 +178,12 @@ type sigevent struct {
 	_ [_sigev_max_size - unsafe.Sizeof(sigeventFields{})]byte
 }
 
+type epollevent struct {
+	events    uint32
+	pad_cgo_0 [4]byte
+	data      [8]byte // unaligned uintptr
+}
+
 const (
 	_O_RDONLY    = 0x0
 	_O_NONBLOCK  = 0x80
diff --git a/src/runtime/defs_linux_mipsx.go b/src/runtime/defs_linux_mipsx.go
index 5d779778c9..5afb6f423f 100644
--- a/src/runtime/defs_linux_mipsx.go
+++ b/src/runtime/defs_linux_mipsx.go
@@ -90,6 +90,17 @@ const (
 	_CLOCK_THREAD_CPUTIME_ID = 0x3
 
 	_SIGEV_THREAD_ID = 0x4
+
+	_EPOLLIN       = 0x1
+	_EPOLLOUT      = 0x4
+	_EPOLLERR      = 0x8
+	_EPOLLHUP      = 0x10
+	_EPOLLRDHUP    = 0x2000
+	_EPOLLET       = 0x80000000
+	_EPOLL_CLOEXEC = 0x80000
+	_EPOLL_CTL_ADD = 0x1
+	_EPOLL_CTL_DEL = 0x2
+	_EPOLL_CTL_MOD = 0x3
 )
 
 type timespec struct {
@@ -161,6 +172,12 @@ type sigevent struct {
 	_ [_sigev_max_size - unsafe.Sizeof(sigeventFields{})]byte
 }
 
+type epollevent struct {
+	events    uint32
+	pad_cgo_0 [4]byte
+	data      uint64
+}
+
 const (
 	_O_RDONLY    = 0x0
 	_O_NONBLOCK  = 0x80
diff --git a/src/runtime/defs_linux_ppc64.go b/src/runtime/defs_linux_ppc64.go
index 36d021a727..f3e305e34e 100644
--- a/src/runtime/defs_linux_ppc64.go
+++ b/src/runtime/defs_linux_ppc64.go
@@ -87,6 +87,17 @@ const (
 	_CLOCK_THREAD_CPUTIME_ID = 0x3
 
 	_SIGEV_THREAD_ID = 0x4
+
+	_EPOLLIN       = 0x1
+	_EPOLLOUT      = 0x4
+	_EPOLLERR      = 0x8
+	_EPOLLHUP      = 0x10
+	_EPOLLRDHUP    = 0x2000
+	_EPOLLET       = 0x80000000
+	_EPOLL_CLOEXEC = 0x80000
+	_EPOLL_CTL_ADD = 0x1
+	_EPOLL_CTL_DEL = 0x2
+	_EPOLL_CTL_MOD = 0x3
 )
 
 //struct Sigset {
@@ -161,6 +172,12 @@ type sigevent struct {
 	_ [_sigev_max_size - unsafe.Sizeof(sigeventFields{})]byte
 }
 
+type epollevent struct {
+	events    uint32
+	pad_cgo_0 [4]byte
+	data      [8]byte // unaligned uintptr
+}
+
 // created by cgo -cdefs and then converted to Go
 // cgo -cdefs defs_linux.go defs3_linux.go
 
diff --git a/src/runtime/defs_linux_ppc64le.go b/src/runtime/defs_linux_ppc64le.go
index 36d021a727..f3e305e34e 100644
--- a/src/runtime/defs_linux_ppc64le.go
+++ b/src/runtime/defs_linux_ppc64le.go
@@ -87,6 +87,17 @@ const (
 	_CLOCK_THREAD_CPUTIME_ID = 0x3
 
 	_SIGEV_THREAD_ID = 0x4
+
+	_EPOLLIN       = 0x1
+	_EPOLLOUT      = 0x4
+	_EPOLLERR      = 0x8
+	_EPOLLHUP      = 0x10
+	_EPOLLRDHUP    = 0x2000
+	_EPOLLET       = 0x80000000
+	_EPOLL_CLOEXEC = 0x80000
+	_EPOLL_CTL_ADD = 0x1
+	_EPOLL_CTL_DEL = 0x2
+	_EPOLL_CTL_MOD = 0x3
 )
 
 //struct Sigset {
@@ -161,6 +172,12 @@ type sigevent struct {
 	_ [_sigev_max_size - unsafe.Sizeof(sigeventFields{})]byte
 }
 
+type epollevent struct {
+	events    uint32
+	pad_cgo_0 [4]byte
+	data      [8]byte // unaligned uintptr
+}
+
 // created by cgo -cdefs and then converted to Go
 // cgo -cdefs defs_linux.go defs3_linux.go
 
diff --git a/src/runtime/defs_linux_riscv64.go b/src/runtime/defs_linux_riscv64.go
index 116a842e58..29496acdcb 100644
--- a/src/runtime/defs_linux_riscv64.go
+++ b/src/runtime/defs_linux_riscv64.go
@@ -89,6 +89,17 @@ const (
 	_CLOCK_THREAD_CPUTIME_ID = 0x3
 
 	_SIGEV_THREAD_ID = 0x4
+
+	_EPOLLIN       = 0x1
+	_EPOLLOUT      = 0x4
+	_EPOLLERR      = 0x8
+	_EPOLLHUP      = 0x10
+	_EPOLLRDHUP    = 0x2000
+	_EPOLLET       = 0x80000000
+	_EPOLL_CLOEXEC = 0x80000
+	_EPOLL_CTL_ADD = 0x1
+	_EPOLL_CTL_DEL = 0x2
+	_EPOLL_CTL_MOD = 0x3
 )
 
 type timespec struct {
@@ -160,6 +171,12 @@ type sigevent struct {
 	_ [_sigev_max_size - unsafe.Sizeof(sigeventFields{})]byte
 }
 
+type epollevent struct {
+	events    uint32
+	pad_cgo_0 [4]byte
+	data      [8]byte // unaligned uintptr
+}
+
 const (
 	_O_RDONLY   = 0x0
 	_O_NONBLOCK = 0x800
diff --git a/src/runtime/defs_linux_s390x.go b/src/runtime/defs_linux_s390x.go
index 79a54fe7e7..817a29ed30 100644
--- a/src/runtime/defs_linux_s390x.go
+++ b/src/runtime/defs_linux_s390x.go
@@ -88,6 +88,17 @@ const (
 	_CLOCK_THREAD_CPUTIME_ID = 0x3
 
 	_SIGEV_THREAD_ID = 0x4
+
+	_EPOLLIN       = 0x1
+	_EPOLLOUT      = 0x4
+	_EPOLLERR      = 0x8
+	_EPOLLHUP      = 0x10
+	_EPOLLRDHUP    = 0x2000
+	_EPOLLET       = 0x80000000
+	_EPOLL_CLOEXEC = 0x80000
+	_EPOLL_CTL_ADD = 0x1
+	_EPOLL_CTL_DEL = 0x2
+	_EPOLL_CTL_MOD = 0x3
 )
 
 type timespec struct {
@@ -157,6 +168,12 @@ type sigevent struct {
 	_ [_sigev_max_size - unsafe.Sizeof(sigeventFields{})]byte
 }
 
+type epollevent struct {
+	events    uint32
+	pad_cgo_0 [4]byte
+	data      [8]byte // unaligned uintptr
+}
+
 const (
 	_O_RDONLY    = 0x0
 	_O_NONBLOCK  = 0x800
diff --git a/src/runtime/export_linux_test.go b/src/runtime/export_linux_test.go
index a441c0efa2..dea94a934c 100644
--- a/src/runtime/export_linux_test.go
+++ b/src/runtime/export_linux_test.go
@@ -6,17 +6,19 @@
 
 package runtime
 
-import (
-	"runtime/internal/syscall"
-)
+import "unsafe"
 
 const SiginfoMaxSize = _si_max_size
 const SigeventMaxSize = _sigev_max_size
 
-var Closeonexec = syscall.CloseOnExec
 var NewOSProc0 = newosproc0
 var Mincore = mincore
 var Add = add
 
+type EpollEvent epollevent
 type Siginfo siginfo
 type Sigevent sigevent
+
+func Epollctl(epfd, op, fd int32, ev unsafe.Pointer) int32 {
+	return epollctl(epfd, op, fd, (*epollevent)(ev))
+}
diff --git a/src/runtime/export_unix2_test.go b/src/runtime/export_unix2_test.go
deleted file mode 100644
index 360565f272..0000000000
--- a/src/runtime/export_unix2_test.go
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright 2022 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 unix && !linux
-
-package runtime
-
-// for linux close-on-exec implemented in runtime/internal/syscall
-var Closeonexec = closeonexec
diff --git a/src/runtime/export_unix_test.go b/src/runtime/export_unix_test.go
index 0119538787..a548cf7b7a 100644
--- a/src/runtime/export_unix_test.go
+++ b/src/runtime/export_unix_test.go
@@ -9,6 +9,7 @@ package runtime
 import "unsafe"
 
 var NonblockingPipe = nonblockingPipe
+var Closeonexec = closeonexec
 
 func sigismember(mask *sigset, i int) bool {
 	clear := *mask
diff --git a/src/runtime/internal/syscall/defs_linux.go b/src/runtime/internal/syscall/defs_linux.go
deleted file mode 100644
index 71f1fa1453..0000000000
--- a/src/runtime/internal/syscall/defs_linux.go
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright 2022 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.
-
-package syscall
-
-const (
-	F_SETFD    = 2
-	FD_CLOEXEC = 1
-)
diff --git a/src/runtime/internal/syscall/defs_linux_386.go b/src/runtime/internal/syscall/defs_linux_386.go
deleted file mode 100644
index dc723a60b2..0000000000
--- a/src/runtime/internal/syscall/defs_linux_386.go
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright 2022 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.
-
-package syscall
-
-const (
-	SYS_FCNTL         = 55
-	SYS_EPOLL_CTL     = 255
-	SYS_EPOLL_PWAIT   = 319
-	SYS_EPOLL_CREATE1 = 329
-	SYS_EPOLL_PWAIT2  = 441
-
-	EPOLLIN       = 0x1
-	EPOLLOUT      = 0x4
-	EPOLLERR      = 0x8
-	EPOLLHUP      = 0x10
-	EPOLLRDHUP    = 0x2000
-	EPOLLET       = 0x80000000
-	EPOLL_CLOEXEC = 0x80000
-	EPOLL_CTL_ADD = 0x1
-	EPOLL_CTL_DEL = 0x2
-	EPOLL_CTL_MOD = 0x3
-)
-
-type EpollEvent struct {
-	Events uint32
-	Data   [8]byte // to match amd64
-}
diff --git a/src/runtime/internal/syscall/defs_linux_amd64.go b/src/runtime/internal/syscall/defs_linux_amd64.go
deleted file mode 100644
index 886eb5bda2..0000000000
--- a/src/runtime/internal/syscall/defs_linux_amd64.go
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright 2022 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.
-
-package syscall
-
-const (
-	SYS_FCNTL         = 72
-	SYS_EPOLL_CTL     = 233
-	SYS_EPOLL_PWAIT   = 281
-	SYS_EPOLL_CREATE1 = 291
-	SYS_EPOLL_PWAIT2  = 441
-
-	EPOLLIN       = 0x1
-	EPOLLOUT      = 0x4
-	EPOLLERR      = 0x8
-	EPOLLHUP      = 0x10
-	EPOLLRDHUP    = 0x2000
-	EPOLLET       = 0x80000000
-	EPOLL_CLOEXEC = 0x80000
-	EPOLL_CTL_ADD = 0x1
-	EPOLL_CTL_DEL = 0x2
-	EPOLL_CTL_MOD = 0x3
-)
-
-type EpollEvent struct {
-	Events uint32
-	Data   [8]byte // unaligned uintptr
-}
diff --git a/src/runtime/internal/syscall/defs_linux_arm.go b/src/runtime/internal/syscall/defs_linux_arm.go
deleted file mode 100644
index 8f812a2f68..0000000000
--- a/src/runtime/internal/syscall/defs_linux_arm.go
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2022 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.
-
-package syscall
-
-const (
-	SYS_FCNTL         = 55
-	SYS_EPOLL_CTL     = 251
-	SYS_EPOLL_PWAIT   = 346
-	SYS_EPOLL_CREATE1 = 357
-	SYS_EPOLL_PWAIT2  = 441
-
-	EPOLLIN       = 0x1
-	EPOLLOUT      = 0x4
-	EPOLLERR      = 0x8
-	EPOLLHUP      = 0x10
-	EPOLLRDHUP    = 0x2000
-	EPOLLET       = 0x80000000
-	EPOLL_CLOEXEC = 0x80000
-	EPOLL_CTL_ADD = 0x1
-	EPOLL_CTL_DEL = 0x2
-	EPOLL_CTL_MOD = 0x3
-)
-
-type EpollEvent struct {
-	Events uint32
-	_pad   uint32
-	Data   [8]byte // to match amd64
-}
diff --git a/src/runtime/internal/syscall/defs_linux_arm64.go b/src/runtime/internal/syscall/defs_linux_arm64.go
deleted file mode 100644
index 48e11b0c51..0000000000
--- a/src/runtime/internal/syscall/defs_linux_arm64.go
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2022 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.
-
-package syscall
-
-const (
-	SYS_EPOLL_CREATE1 = 20
-	SYS_EPOLL_CTL     = 21
-	SYS_EPOLL_PWAIT   = 22
-	SYS_FCNTL         = 25
-	SYS_EPOLL_PWAIT2  = 441
-
-	EPOLLIN       = 0x1
-	EPOLLOUT      = 0x4
-	EPOLLERR      = 0x8
-	EPOLLHUP      = 0x10
-	EPOLLRDHUP    = 0x2000
-	EPOLLET       = 0x80000000
-	EPOLL_CLOEXEC = 0x80000
-	EPOLL_CTL_ADD = 0x1
-	EPOLL_CTL_DEL = 0x2
-	EPOLL_CTL_MOD = 0x3
-)
-
-type EpollEvent struct {
-	Events uint32
-	_pad   uint32
-	Data   [8]byte // to match amd64
-}
diff --git a/src/runtime/internal/syscall/defs_linux_loong64.go b/src/runtime/internal/syscall/defs_linux_loong64.go
deleted file mode 100644
index b78ef81861..0000000000
--- a/src/runtime/internal/syscall/defs_linux_loong64.go
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2022 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.
-
-package syscall
-
-const (
-	SYS_EPOLL_CREATE1 = 20
-	SYS_EPOLL_CTL     = 21
-	SYS_EPOLL_PWAIT   = 22
-	SYS_FCNTL         = 25
-	SYS_EPOLL_PWAIT2  = 441
-
-	EPOLLIN       = 0x1
-	EPOLLOUT      = 0x4
-	EPOLLERR      = 0x8
-	EPOLLHUP      = 0x10
-	EPOLLRDHUP    = 0x2000
-	EPOLLET       = 0x80000000
-	EPOLL_CLOEXEC = 0x80000
-	EPOLL_CTL_ADD = 0x1
-	EPOLL_CTL_DEL = 0x2
-	EPOLL_CTL_MOD = 0x3
-)
-
-type EpollEvent struct {
-	Events    uint32
-	pad_cgo_0 [4]byte
-	Data      [8]byte // unaligned uintptr
-}
diff --git a/src/runtime/internal/syscall/defs_linux_mips64x.go b/src/runtime/internal/syscall/defs_linux_mips64x.go
deleted file mode 100644
index 92b49ca969..0000000000
--- a/src/runtime/internal/syscall/defs_linux_mips64x.go
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright 2022 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 linux && (mips64 || mips64le)
-
-package syscall
-
-const (
-	SYS_FCNTL         = 5070
-	SYS_EPOLL_CTL     = 5208
-	SYS_EPOLL_PWAIT   = 5272
-	SYS_EPOLL_CREATE1 = 5285
-	SYS_EPOLL_PWAIT2  = 5441
-
-	EPOLLIN       = 0x1
-	EPOLLOUT      = 0x4
-	EPOLLERR      = 0x8
-	EPOLLHUP      = 0x10
-	EPOLLRDHUP    = 0x2000
-	EPOLLET       = 0x80000000
-	EPOLL_CLOEXEC = 0x80000
-	EPOLL_CTL_ADD = 0x1
-	EPOLL_CTL_DEL = 0x2
-	EPOLL_CTL_MOD = 0x3
-)
-
-type EpollEvent struct {
-	Events    uint32
-	pad_cgo_0 [4]byte
-	Data      [8]byte // unaligned uintptr
-}
diff --git a/src/runtime/internal/syscall/defs_linux_mipsx.go b/src/runtime/internal/syscall/defs_linux_mipsx.go
deleted file mode 100644
index e28d09c7f1..0000000000
--- a/src/runtime/internal/syscall/defs_linux_mipsx.go
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright 2022 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 linux && (mips || mipsle)
-
-package syscall
-
-const (
-	SYS_FCNTL         = 4055
-	SYS_EPOLL_CTL     = 4249
-	SYS_EPOLL_PWAIT   = 4313
-	SYS_EPOLL_CREATE1 = 4326
-	SYS_EPOLL_PWAIT2  = 4441
-
-	EPOLLIN       = 0x1
-	EPOLLOUT      = 0x4
-	EPOLLERR      = 0x8
-	EPOLLHUP      = 0x10
-	EPOLLRDHUP    = 0x2000
-	EPOLLET       = 0x80000000
-	EPOLL_CLOEXEC = 0x80000
-	EPOLL_CTL_ADD = 0x1
-	EPOLL_CTL_DEL = 0x2
-	EPOLL_CTL_MOD = 0x3
-)
-
-type EpollEvent struct {
-	Events    uint32
-	pad_cgo_0 [4]byte
-	Data      uint64
-}
diff --git a/src/runtime/internal/syscall/defs_linux_ppc64x.go b/src/runtime/internal/syscall/defs_linux_ppc64x.go
deleted file mode 100644
index a74483eb6d..0000000000
--- a/src/runtime/internal/syscall/defs_linux_ppc64x.go
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright 2022 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 linux && (ppc64 || ppc64le)
-
-package syscall
-
-const (
-	SYS_FCNTL         = 55
-	SYS_EPOLL_CTL     = 237
-	SYS_EPOLL_PWAIT   = 303
-	SYS_EPOLL_CREATE1 = 315
-	SYS_EPOLL_PWAIT2  = 441
-
-	EPOLLIN       = 0x1
-	EPOLLOUT      = 0x4
-	EPOLLERR      = 0x8
-	EPOLLHUP      = 0x10
-	EPOLLRDHUP    = 0x2000
-	EPOLLET       = 0x80000000
-	EPOLL_CLOEXEC = 0x80000
-	EPOLL_CTL_ADD = 0x1
-	EPOLL_CTL_DEL = 0x2
-	EPOLL_CTL_MOD = 0x3
-)
-
-type EpollEvent struct {
-	Events    uint32
-	pad_cgo_0 [4]byte
-	Data      [8]byte // unaligned uintptr
-}
diff --git a/src/runtime/internal/syscall/defs_linux_riscv64.go b/src/runtime/internal/syscall/defs_linux_riscv64.go
deleted file mode 100644
index b78ef81861..0000000000
--- a/src/runtime/internal/syscall/defs_linux_riscv64.go
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2022 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.
-
-package syscall
-
-const (
-	SYS_EPOLL_CREATE1 = 20
-	SYS_EPOLL_CTL     = 21
-	SYS_EPOLL_PWAIT   = 22
-	SYS_FCNTL         = 25
-	SYS_EPOLL_PWAIT2  = 441
-
-	EPOLLIN       = 0x1
-	EPOLLOUT      = 0x4
-	EPOLLERR      = 0x8
-	EPOLLHUP      = 0x10
-	EPOLLRDHUP    = 0x2000
-	EPOLLET       = 0x80000000
-	EPOLL_CLOEXEC = 0x80000
-	EPOLL_CTL_ADD = 0x1
-	EPOLL_CTL_DEL = 0x2
-	EPOLL_CTL_MOD = 0x3
-)
-
-type EpollEvent struct {
-	Events    uint32
-	pad_cgo_0 [4]byte
-	Data      [8]byte // unaligned uintptr
-}
diff --git a/src/runtime/internal/syscall/defs_linux_s390x.go b/src/runtime/internal/syscall/defs_linux_s390x.go
deleted file mode 100644
index a7bb1ba66d..0000000000
--- a/src/runtime/internal/syscall/defs_linux_s390x.go
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2022 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.
-
-package syscall
-
-const (
-	SYS_FCNTL         = 55
-	SYS_EPOLL_CTL     = 250
-	SYS_EPOLL_PWAIT   = 312
-	SYS_EPOLL_CREATE1 = 327
-	SYS_EPOLL_PWAIT2  = 441
-
-	EPOLLIN       = 0x1
-	EPOLLOUT      = 0x4
-	EPOLLERR      = 0x8
-	EPOLLHUP      = 0x10
-	EPOLLRDHUP    = 0x2000
-	EPOLLET       = 0x80000000
-	EPOLL_CLOEXEC = 0x80000
-	EPOLL_CTL_ADD = 0x1
-	EPOLL_CTL_DEL = 0x2
-	EPOLL_CTL_MOD = 0x3
-)
-
-type EpollEvent struct {
-	Events    uint32
-	pad_cgo_0 [4]byte
-	Data      [8]byte // unaligned uintptr
-}
diff --git a/src/runtime/internal/syscall/syscall_linux.go b/src/runtime/internal/syscall/syscall_linux.go
index a103d318c4..7f268e8fba 100644
--- a/src/runtime/internal/syscall/syscall_linux.go
+++ b/src/runtime/internal/syscall/syscall_linux.go
@@ -6,7 +6,7 @@
 package syscall
 
 import (
-	"unsafe"
+	_ "unsafe" // for go:linkname
 )
 
 // TODO(https://go.dev/issue/51087): This package is incomplete and currently
@@ -37,30 +37,3 @@ func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)
 func syscall_RawSyscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr) {
 	return Syscall6(num, a1, a2, a3, a4, a5, a6)
 }
-
-func EpollCreate1(flags int32) (fd int32, errno uintptr) {
-	r1, _, e := Syscall6(SYS_EPOLL_CREATE1, uintptr(flags), 0, 0, 0, 0, 0)
-	return int32(r1), e
-}
-
-var _zero uintptr
-
-func EpollWait(epfd int32, events []EpollEvent, maxev, waitms int32) (n int32, errno uintptr) {
-	var ev unsafe.Pointer
-	if len(events) > 0 {
-		ev = unsafe.Pointer(&events[0])
-	} else {
-		ev = unsafe.Pointer(&_zero)
-	}
-	r1, _, e := Syscall6(SYS_EPOLL_PWAIT, uintptr(epfd), uintptr(ev), uintptr(maxev), uintptr(waitms), 0, 0)
-	return int32(r1), e
-}
-
-func EpollCtl(epfd, op, fd int32, event *EpollEvent) (errno uintptr) {
-	_, _, e := Syscall6(SYS_EPOLL_CTL, uintptr(epfd), uintptr(op), uintptr(fd), uintptr(unsafe.Pointer(event)), 0, 0)
-	return e
-}
-
-func CloseOnExec(fd int32) {
-	Syscall6(SYS_FCNTL, uintptr(fd), F_SETFD, FD_CLOEXEC, 0, 0, 0)
-}
diff --git a/src/runtime/internal/syscall/syscall_linux_test.go b/src/runtime/internal/syscall/syscall_linux_test.go
deleted file mode 100644
index 1976da5c28..0000000000
--- a/src/runtime/internal/syscall/syscall_linux_test.go
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2022 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.
-
-package syscall_test
-
-import (
-	"runtime/internal/syscall"
-	"testing"
-)
-
-func TestEpollctlErrorSign(t *testing.T) {
-	v := syscall.EpollCtl(-1, 1, -1, &syscall.EpollEvent{})
-
-	const EBADF = 0x09
-	if v != EBADF {
-		t.Errorf("epollctl = %v, want %v", v, EBADF)
-	}
-}
diff --git a/src/runtime/netpoll_epoll.go b/src/runtime/netpoll_epoll.go
index 7164a59551..09da662c92 100644
--- a/src/runtime/netpoll_epoll.go
+++ b/src/runtime/netpoll_epoll.go
@@ -8,10 +8,19 @@ package runtime
 
 import (
 	"runtime/internal/atomic"
-	"runtime/internal/syscall"
 	"unsafe"
 )
 
+func epollcreate(size int32) int32
+func epollcreate1(flags int32) int32
+
+//go:noescape
+func epollctl(epfd, op, fd int32, ev *epollevent) int32
+
+//go:noescape
+func epollwait(epfd int32, ev *epollevent, nev, timeout int32) int32
+func closeonexec(fd int32)
+
 var (
 	epfd int32 = -1 // epoll descriptor
 
@@ -21,24 +30,27 @@ var (
 )
 
 func netpollinit() {
-	var errno uintptr
-	epfd, errno = syscall.EpollCreate1(syscall.EPOLL_CLOEXEC)
-	if errno != 0 {
-		println("runtime: epollcreate failed with", errno)
-		throw("runtime: netpollinit failed")
+	epfd = epollcreate1(_EPOLL_CLOEXEC)
+	if epfd < 0 {
+		epfd = epollcreate(1024)
+		if epfd < 0 {
+			println("runtime: epollcreate failed with", -epfd)
+			throw("runtime: netpollinit failed")
+		}
+		closeonexec(epfd)
 	}
-	r, w, errpipe := nonblockingPipe()
-	if errpipe != 0 {
-		println("runtime: pipe failed with", -errpipe)
+	r, w, errno := nonblockingPipe()
+	if errno != 0 {
+		println("runtime: pipe failed with", -errno)
 		throw("runtime: pipe failed")
 	}
-	ev := syscall.EpollEvent{
-		Events: syscall.EPOLLIN,
+	ev := epollevent{
+		events: _EPOLLIN,
 	}
-	*(**uintptr)(unsafe.Pointer(&ev.Data)) = &netpollBreakRd
-	errno = syscall.EpollCtl(epfd, syscall.EPOLL_CTL_ADD, r, &ev)
+	*(**uintptr)(unsafe.Pointer(&ev.data)) = &netpollBreakRd
+	errno = epollctl(epfd, _EPOLL_CTL_ADD, r, &ev)
 	if errno != 0 {
-		println("runtime: epollctl failed with", errno)
+		println("runtime: epollctl failed with", -errno)
 		throw("runtime: epollctl failed")
 	}
 	netpollBreakRd = uintptr(r)
@@ -49,16 +61,16 @@ func netpollIsPollDescriptor(fd uintptr) bool {
 	return fd == uintptr(epfd) || fd == netpollBreakRd || fd == netpollBreakWr
 }
 
-func netpollopen(fd uintptr, pd *pollDesc) uintptr {
-	var ev syscall.EpollEvent
-	ev.Events = syscall.EPOLLIN | syscall.EPOLLOUT | syscall.EPOLLRDHUP | syscall.EPOLLET
-	*(**pollDesc)(unsafe.Pointer(&ev.Data)) = pd
-	return syscall.EpollCtl(epfd, syscall.EPOLL_CTL_ADD, int32(fd), &ev)
+func netpollopen(fd uintptr, pd *pollDesc) int32 {
+	var ev epollevent
+	ev.events = _EPOLLIN | _EPOLLOUT | _EPOLLRDHUP | _EPOLLET
+	*(**pollDesc)(unsafe.Pointer(&ev.data)) = pd
+	return -epollctl(epfd, _EPOLL_CTL_ADD, int32(fd), &ev)
 }
 
-func netpollclose(fd uintptr) uintptr {
-	var ev syscall.EpollEvent
-	return syscall.EpollCtl(epfd, syscall.EPOLL_CTL_DEL, int32(fd), &ev)
+func netpollclose(fd uintptr) int32 {
+	var ev epollevent
+	return -epollctl(epfd, _EPOLL_CTL_DEL, int32(fd), &ev)
 }
 
 func netpollarm(pd *pollDesc, mode int) {
@@ -112,12 +124,12 @@ func netpoll(delay int64) gList {
 		// 1e9 ms == ~11.5 days.
 		waitms = 1e9
 	}
-	var events [128]syscall.EpollEvent
+	var events [128]epollevent
 retry:
-	n, errno := syscall.EpollWait(epfd, events[:], int32(len(events)), waitms)
-	if errno != 0 {
-		if errno != _EINTR {
-			println("runtime: epollwait on fd", epfd, "failed with", errno)
+	n := epollwait(epfd, &events[0], int32(len(events)), waitms)
+	if n < 0 {
+		if n != -_EINTR {
+			println("runtime: epollwait on fd", epfd, "failed with", -n)
 			throw("runtime: netpoll failed")
 		}
 		// If a timed sleep was interrupted, just return to
@@ -129,14 +141,14 @@ retry:
 	}
 	var toRun gList
 	for i := int32(0); i < n; i++ {
-		ev := events[i]
-		if ev.Events == 0 {
+		ev := &events[i]
+		if ev.events == 0 {
 			continue
 		}
 
-		if *(**uintptr)(unsafe.Pointer(&ev.Data)) == &netpollBreakRd {
-			if ev.Events != syscall.EPOLLIN {
-				println("runtime: netpoll: break fd ready for", ev.Events)
+		if *(**uintptr)(unsafe.Pointer(&ev.data)) == &netpollBreakRd {
+			if ev.events != _EPOLLIN {
+				println("runtime: netpoll: break fd ready for", ev.events)
 				throw("runtime: netpoll: break fd ready for something unexpected")
 			}
 			if delay != 0 {
@@ -151,15 +163,15 @@ retry:
 		}
 
 		var mode int32
-		if ev.Events&(syscall.EPOLLIN|syscall.EPOLLRDHUP|syscall.EPOLLHUP|syscall.EPOLLERR) != 0 {
+		if ev.events&(_EPOLLIN|_EPOLLRDHUP|_EPOLLHUP|_EPOLLERR) != 0 {
 			mode += 'r'
 		}
-		if ev.Events&(syscall.EPOLLOUT|syscall.EPOLLHUP|syscall.EPOLLERR) != 0 {
+		if ev.events&(_EPOLLOUT|_EPOLLHUP|_EPOLLERR) != 0 {
 			mode += 'w'
 		}
 		if mode != 0 {
-			pd := *(**pollDesc)(unsafe.Pointer(&ev.Data))
-			pd.setEventErr(ev.Events == syscall.EPOLLERR)
+			pd := *(**pollDesc)(unsafe.Pointer(&ev.data))
+			pd.setEventErr(ev.events == _EPOLLERR)
 			netpollready(&toRun, pd, mode)
 		}
 	}
diff --git a/src/runtime/runtime_linux_test.go b/src/runtime/runtime_linux_test.go
index 6af5561e91..a753aeea58 100644
--- a/src/runtime/runtime_linux_test.go
+++ b/src/runtime/runtime_linux_test.go
@@ -53,6 +53,15 @@ func TestMincoreErrorSign(t *testing.T) {
 	}
 }
 
+func TestEpollctlErrorSign(t *testing.T) {
+	v := Epollctl(-1, 1, -1, unsafe.Pointer(&EpollEvent{}))
+
+	const EBADF = 0x09
+	if v != -EBADF {
+		t.Errorf("epollctl = %v, want %v", v, -EBADF)
+	}
+}
+
 func TestKernelStructSize(t *testing.T) {
 	// Check that the Go definitions of structures exchanged with the kernel are
 	// the same size as what the kernel defines.
diff --git a/src/runtime/sys_linux_386.s b/src/runtime/sys_linux_386.s
index 4f5b34b996..4942f21e4f 100644
--- a/src/runtime/sys_linux_386.s
+++ b/src/runtime/sys_linux_386.s
@@ -33,6 +33,7 @@
 #define SYS_access		33
 #define SYS_kill		37
 #define SYS_brk 		45
+#define SYS_fcntl		55
 #define SYS_munmap		91
 #define SYS_socketcall		102
 #define SYS_setittimer		104
@@ -51,11 +52,15 @@
 #define SYS_sched_getaffinity	242
 #define SYS_set_thread_area	243
 #define SYS_exit_group		252
+#define SYS_epoll_create	254
+#define SYS_epoll_ctl		255
+#define SYS_epoll_wait		256
 #define SYS_timer_create	259
 #define SYS_timer_settime	260
 #define SYS_timer_delete	263
 #define SYS_clock_gettime	265
 #define SYS_tgkill		270
+#define SYS_epoll_create1	329
 #define SYS_pipe2		331
 
 TEXT runtime·exit(SB),NOSPLIT,$0
@@ -721,6 +726,53 @@ TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0
 	MOVL	AX, ret+12(FP)
 	RET
 
+// int32 runtime·epollcreate(int32 size);
+TEXT runtime·epollcreate(SB),NOSPLIT,$0
+	MOVL    $SYS_epoll_create, AX
+	MOVL	size+0(FP), BX
+	INVOKE_SYSCALL
+	MOVL	AX, ret+4(FP)
+	RET
+
+// int32 runtime·epollcreate1(int32 flags);
+TEXT runtime·epollcreate1(SB),NOSPLIT,$0
+	MOVL    $SYS_epoll_create1, AX
+	MOVL	flags+0(FP), BX
+	INVOKE_SYSCALL
+	MOVL	AX, ret+4(FP)
+	RET
+
+// func epollctl(epfd, op, fd int32, ev *epollEvent) int
+TEXT runtime·epollctl(SB),NOSPLIT,$0
+	MOVL	$SYS_epoll_ctl, AX
+	MOVL	epfd+0(FP), BX
+	MOVL	op+4(FP), CX
+	MOVL	fd+8(FP), DX
+	MOVL	ev+12(FP), SI
+	INVOKE_SYSCALL
+	MOVL	AX, ret+16(FP)
+	RET
+
+// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
+TEXT runtime·epollwait(SB),NOSPLIT,$0
+	MOVL	$SYS_epoll_wait, AX
+	MOVL	epfd+0(FP), BX
+	MOVL	ev+4(FP), CX
+	MOVL	nev+8(FP), DX
+	MOVL	timeout+12(FP), SI
+	INVOKE_SYSCALL
+	MOVL	AX, ret+16(FP)
+	RET
+
+// void runtime·closeonexec(int32 fd);
+TEXT runtime·closeonexec(SB),NOSPLIT,$0
+	MOVL	$SYS_fcntl, AX
+	MOVL	fd+0(FP), BX  // fd
+	MOVL	$2, CX  // F_SETFD
+	MOVL	$1, DX  // FD_CLOEXEC
+	INVOKE_SYSCALL
+	RET
+
 // int access(const char *name, int mode)
 TEXT runtime·access(SB),NOSPLIT,$0
 	MOVL	$SYS_access, AX
diff --git a/src/runtime/sys_linux_amd64.s b/src/runtime/sys_linux_amd64.s
index d91f9bd31f..ca6ecb13eb 100644
--- a/src/runtime/sys_linux_amd64.s
+++ b/src/runtime/sys_linux_amd64.s
@@ -33,19 +33,24 @@
 #define SYS_clone		56
 #define SYS_exit		60
 #define SYS_kill		62
+#define SYS_fcntl		72
 #define SYS_sigaltstack 	131
 #define SYS_arch_prctl		158
 #define SYS_gettid		186
 #define SYS_futex		202
 #define SYS_sched_getaffinity	204
+#define SYS_epoll_create	213
 #define SYS_timer_create	222
 #define SYS_timer_settime	223
 #define SYS_timer_delete	226
 #define SYS_clock_gettime	228
 #define SYS_exit_group		231
+#define SYS_epoll_ctl		233
 #define SYS_tgkill		234
 #define SYS_openat		257
 #define SYS_faccessat		269
+#define SYS_epoll_pwait		281
+#define SYS_epoll_create1	291
 #define SYS_pipe2		293
 
 TEXT runtime·exit(SB),NOSPLIT,$0-4
@@ -661,6 +666,55 @@ TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0
 	MOVL	AX, ret+24(FP)
 	RET
 
+// int32 runtime·epollcreate(int32 size);
+TEXT runtime·epollcreate(SB),NOSPLIT,$0
+	MOVL    size+0(FP), DI
+	MOVL    $SYS_epoll_create, AX
+	SYSCALL
+	MOVL	AX, ret+8(FP)
+	RET
+
+// int32 runtime·epollcreate1(int32 flags);
+TEXT runtime·epollcreate1(SB),NOSPLIT,$0
+	MOVL	flags+0(FP), DI
+	MOVL	$SYS_epoll_create1, AX
+	SYSCALL
+	MOVL	AX, ret+8(FP)
+	RET
+
+// func epollctl(epfd, op, fd int32, ev *epollEvent) int
+TEXT runtime·epollctl(SB),NOSPLIT,$0
+	MOVL	epfd+0(FP), DI
+	MOVL	op+4(FP), SI
+	MOVL	fd+8(FP), DX
+	MOVQ	ev+16(FP), R10
+	MOVL	$SYS_epoll_ctl, AX
+	SYSCALL
+	MOVL	AX, ret+24(FP)
+	RET
+
+// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
+TEXT runtime·epollwait(SB),NOSPLIT,$0
+	// This uses pwait instead of wait, because Android O blocks wait.
+	MOVL	epfd+0(FP), DI
+	MOVQ	ev+8(FP), SI
+	MOVL	nev+16(FP), DX
+	MOVL	timeout+20(FP), R10
+	MOVQ	$0, R8
+	MOVL	$SYS_epoll_pwait, AX
+	SYSCALL
+	MOVL	AX, ret+24(FP)
+	RET
+
+// void runtime·closeonexec(int32 fd);
+TEXT runtime·closeonexec(SB),NOSPLIT,$0
+	MOVL    fd+0(FP), DI  // fd
+	MOVQ    $2, SI  // F_SETFD
+	MOVQ    $1, DX  // FD_CLOEXEC
+	MOVL	$SYS_fcntl, AX
+	SYSCALL
+	RET
+
 // int access(const char *name, int mode)
 TEXT runtime·access(SB),NOSPLIT,$0
 	// This uses faccessat instead of access, because Android O blocks access.
diff --git a/src/runtime/sys_linux_arm.s b/src/runtime/sys_linux_arm.s
index 1bc9e86d6d..9ac64328c1 100644
--- a/src/runtime/sys_linux_arm.s
+++ b/src/runtime/sys_linux_arm.s
@@ -41,10 +41,15 @@
 #define SYS_nanosleep (SYS_BASE + 162)
 #define SYS_sched_getaffinity (SYS_BASE + 242)
 #define SYS_clock_gettime (SYS_BASE + 263)
+#define SYS_epoll_create (SYS_BASE + 250)
+#define SYS_epoll_ctl (SYS_BASE + 251)
+#define SYS_epoll_wait (SYS_BASE + 252)
 #define SYS_timer_create (SYS_BASE + 257)
 #define SYS_timer_settime (SYS_BASE + 258)
 #define SYS_timer_delete (SYS_BASE + 261)
+#define SYS_epoll_create1 (SYS_BASE + 357)
 #define SYS_pipe2 (SYS_BASE + 359)
+#define SYS_fcntl (SYS_BASE + 55)
 #define SYS_access (SYS_BASE + 33)
 #define SYS_connect (SYS_BASE + 283)
 #define SYS_socket (SYS_BASE + 281)
@@ -611,6 +616,53 @@ TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0
 	MOVW	R0, ret+12(FP)
 	RET
 
+// int32 runtime·epollcreate(int32 size)
+TEXT runtime·epollcreate(SB),NOSPLIT,$0
+	MOVW	size+0(FP), R0
+	MOVW	$SYS_epoll_create, R7
+	SWI	$0
+	MOVW	R0, ret+4(FP)
+	RET
+
+// int32 runtime·epollcreate1(int32 flags)
+TEXT runtime·epollcreate1(SB),NOSPLIT,$0
+	MOVW	flags+0(FP), R0
+	MOVW	$SYS_epoll_create1, R7
+	SWI	$0
+	MOVW	R0, ret+4(FP)
+	RET
+
+// func epollctl(epfd, op, fd int32, ev *epollEvent) int
+TEXT runtime·epollctl(SB),NOSPLIT,$0
+	MOVW	epfd+0(FP), R0
+	MOVW	op+4(FP), R1
+	MOVW	fd+8(FP), R2
+	MOVW	ev+12(FP), R3
+	MOVW	$SYS_epoll_ctl, R7
+	SWI	$0
+	MOVW	R0, ret+16(FP)
+	RET
+
+// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout)
+TEXT runtime·epollwait(SB),NOSPLIT,$0
+	MOVW	epfd+0(FP), R0
+	MOVW	ev+4(FP), R1
+	MOVW	nev+8(FP), R2
+	MOVW	timeout+12(FP), R3
+	MOVW	$SYS_epoll_wait, R7
+	SWI	$0
+	MOVW	R0, ret+16(FP)
+	RET
+
+// void runtime·closeonexec(int32 fd)
+TEXT runtime·closeonexec(SB),NOSPLIT,$0
+	MOVW	fd+0(FP), R0	// fd
+	MOVW	$2, R1	// F_SETFD
+	MOVW	$1, R2	// FD_CLOEXEC
+	MOVW	$SYS_fcntl, R7
+	SWI	$0
+	RET
+
 // b __kuser_get_tls @ 0xffff0fe0
 TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
 	MOVW	$0xffff0fe0, R0
diff --git a/src/runtime/sys_linux_arm64.s b/src/runtime/sys_linux_arm64.s
index 04a2cd2da1..b47b6fd0a0 100644
--- a/src/runtime/sys_linux_arm64.s
+++ b/src/runtime/sys_linux_arm64.s
@@ -22,6 +22,7 @@
 #define SYS_openat		56
 #define SYS_close		57
 #define SYS_pipe2		59
+#define SYS_fcntl		25
 #define SYS_nanosleep		101
 #define SYS_mmap		222
 #define SYS_munmap		215
@@ -41,6 +42,9 @@
 #define SYS_futex		98
 #define SYS_sched_getaffinity	123
 #define SYS_exit_group		94
+#define SYS_epoll_create1	20
+#define SYS_epoll_ctl		21
+#define SYS_epoll_pwait		22
 #define SYS_clock_gettime	113
 #define SYS_faccessat		48
 #define SYS_socket		198
@@ -758,6 +762,54 @@ TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
 	MOVW	R0, ret+24(FP)
 	RET
 
+// int32 runtime·epollcreate(int32 size);
+TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
+	MOVW	$0, R0
+	MOVD	$SYS_epoll_create1, R8
+	SVC
+	MOVW	R0, ret+8(FP)
+	RET
+
+// int32 runtime·epollcreate1(int32 flags);
+TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
+	MOVW	flags+0(FP), R0
+	MOVD	$SYS_epoll_create1, R8
+	SVC
+	MOVW	R0, ret+8(FP)
+	RET
+
+// func epollctl(epfd, op, fd int32, ev *epollEvent) int
+TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
+	MOVW	epfd+0(FP), R0
+	MOVW	op+4(FP), R1
+	MOVW	fd+8(FP), R2
+	MOVD	ev+16(FP), R3
+	MOVD	$SYS_epoll_ctl, R8
+	SVC
+	MOVW	R0, ret+24(FP)
+	RET
+
+// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
+TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
+	MOVW	epfd+0(FP), R0
+	MOVD	ev+8(FP), R1
+	MOVW	nev+16(FP), R2
+	MOVW	timeout+20(FP), R3
+	MOVD	$0, R4
+	MOVD	$SYS_epoll_pwait, R8
+	SVC
+	MOVW	R0, ret+24(FP)
+	RET
+
+// void runtime·closeonexec(int32 fd);
+TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
+	MOVW	fd+0(FP), R0  // fd
+	MOVD	$2, R1	// F_SETFD
+	MOVD	$1, R2	// FD_CLOEXEC
+	MOVD	$SYS_fcntl, R8
+	SVC
+	RET
+
 // int access(const char *name, int mode)
 TEXT runtime·access(SB),NOSPLIT,$0-20
 	MOVD	$AT_FDCWD, R0
diff --git a/src/runtime/sys_linux_loong64.s b/src/runtime/sys_linux_loong64.s
index 5705c37496..36a92df87c 100644
--- a/src/runtime/sys_linux_loong64.s
+++ b/src/runtime/sys_linux_loong64.s
@@ -18,6 +18,7 @@
 #define SYS_close		57
 #define SYS_getpid		172
 #define SYS_kill		129
+#define SYS_fcntl		25
 #define SYS_mmap		222
 #define SYS_munmap		215
 #define SYS_setitimer		103
@@ -34,9 +35,12 @@
 #define SYS_futex		98
 #define SYS_sched_getaffinity	123
 #define SYS_exit_group		94
+#define SYS_epoll_ctl		21
 #define SYS_tgkill		131
 #define SYS_openat		56
+#define SYS_epoll_pwait		22
 #define SYS_clock_gettime	113
+#define SYS_epoll_create1	20
 #define SYS_brk			214
 #define SYS_pipe2		59
 #define SYS_timer_create	107
@@ -530,6 +534,54 @@ TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
 	MOVW	R4, ret+24(FP)
 	RET
 
+// int32 runtime·epollcreate(int32 size);
+TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
+	MOVW	size+0(FP), R4
+	MOVV	$SYS_epoll_create1, R11
+	SYSCALL
+	MOVW	R4, ret+8(FP)
+	RET
+
+// int32 runtime·epollcreate1(int32 flags);
+TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
+	MOVW	flags+0(FP), R4
+	MOVV	$SYS_epoll_create1, R11
+	SYSCALL
+	MOVW	R4, ret+8(FP)
+	RET
+
+// func epollctl(epfd, op, fd int32, ev *epollEvent) int
+TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
+	MOVW	epfd+0(FP), R4
+	MOVW	op+4(FP), R5
+	MOVW	fd+8(FP), R6
+	MOVV	ev+16(FP), R7
+	MOVV	$SYS_epoll_ctl, R11
+	SYSCALL
+	MOVW	R4, ret+24(FP)
+	RET
+
+// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
+TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
+	MOVW	epfd+0(FP), R4
+	MOVV	ev+8(FP), R5
+	MOVW	nev+16(FP), R6
+	MOVW	timeout+20(FP), R7
+	MOVV	$0, R8
+	MOVV	$SYS_epoll_pwait, R11
+	SYSCALL
+	MOVW	R4, ret+24(FP)
+	RET
+
+// void runtime·closeonexec(int32 fd);
+TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
+	MOVW	fd+0(FP), R4  // fd
+	MOVV	$2, R5	// F_SETFD
+	MOVV	$1, R6	// FD_CLOEXEC
+	MOVV	$SYS_fcntl, R11
+	SYSCALL
+	RET
+
 // func sbrk0() uintptr
 TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0-8
 	// Implemented as brk(NULL).
diff --git a/src/runtime/sys_linux_mips64x.s b/src/runtime/sys_linux_mips64x.s
index 5d11339584..06d54dff78 100644
--- a/src/runtime/sys_linux_mips64x.s
+++ b/src/runtime/sys_linux_mips64x.s
@@ -20,6 +20,7 @@
 #define SYS_close		5003
 #define SYS_getpid		5038
 #define SYS_kill		5060
+#define SYS_fcntl		5070
 #define SYS_mmap		5009
 #define SYS_munmap		5011
 #define SYS_setitimer		5036
@@ -36,12 +37,16 @@
 #define SYS_futex		5194
 #define SYS_sched_getaffinity	5196
 #define SYS_exit_group		5205
+#define SYS_epoll_create	5207
+#define SYS_epoll_ctl		5208
 #define SYS_timer_create	5216
 #define SYS_timer_settime	5217
 #define SYS_timer_delete	5220
 #define SYS_tgkill		5225
 #define SYS_openat		5247
+#define SYS_epoll_pwait		5272
 #define SYS_clock_gettime	5222
+#define SYS_epoll_create1	5285
 #define SYS_brk			5012
 #define SYS_pipe2		5287
 
@@ -563,6 +568,62 @@ TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
 	MOVW	R2, ret+24(FP)
 	RET
 
+// int32 runtime·epollcreate(int32 size);
+TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
+	MOVW    size+0(FP), R4
+	MOVV	$SYS_epoll_create, R2
+	SYSCALL
+	BEQ	R7, 2(PC)
+	SUBVU	R2, R0, R2	// caller expects negative errno
+	MOVW	R2, ret+8(FP)
+	RET
+
+// int32 runtime·epollcreate1(int32 flags);
+TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
+	MOVW	flags+0(FP), R4
+	MOVV	$SYS_epoll_create1, R2
+	SYSCALL
+	BEQ	R7, 2(PC)
+	SUBVU	R2, R0, R2	// caller expects negative errno
+	MOVW	R2, ret+8(FP)
+	RET
+
+// func epollctl(epfd, op, fd int32, ev *epollEvent) int
+TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
+	MOVW	epfd+0(FP), R4
+	MOVW	op+4(FP), R5
+	MOVW	fd+8(FP), R6
+	MOVV	ev+16(FP), R7
+	MOVV	$SYS_epoll_ctl, R2
+	SYSCALL
+	SUBVU	R2, R0, R2	// caller expects negative errno
+	MOVW	R2, ret+24(FP)
+	RET
+
+// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
+TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
+	// This uses pwait instead of wait, because Android O blocks wait.
+	MOVW	epfd+0(FP), R4
+	MOVV	ev+8(FP), R5
+	MOVW	nev+16(FP), R6
+	MOVW	timeout+20(FP), R7
+	MOVV	$0, R8
+	MOVV	$SYS_epoll_pwait, R2
+	SYSCALL
+	BEQ	R7, 2(PC)
+	SUBVU	R2, R0, R2	// caller expects negative errno
+	MOVW	R2, ret+24(FP)
+	RET
+
+// void runtime·closeonexec(int32 fd);
+TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
+	MOVW    fd+0(FP), R4  // fd
+	MOVV    $2, R5  // F_SETFD
+	MOVV    $1, R6  // FD_CLOEXEC
+	MOVV	$SYS_fcntl, R2
+	SYSCALL
+	RET
+
 // func sbrk0() uintptr
 TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0-8
 	// Implemented as brk(NULL).
diff --git a/src/runtime/sys_linux_mipsx.s b/src/runtime/sys_linux_mipsx.s
index c4507c6098..e70edcc0e2 100644
--- a/src/runtime/sys_linux_mipsx.s
+++ b/src/runtime/sys_linux_mipsx.s
@@ -20,6 +20,7 @@
 #define SYS_getpid		4020
 #define SYS_kill		4037
 #define SYS_brk			4045
+#define SYS_fcntl		4055
 #define SYS_mmap		4090
 #define SYS_munmap		4091
 #define SYS_setitimer		4104
@@ -36,11 +37,15 @@
 #define SYS_futex		4238
 #define SYS_sched_getaffinity	4240
 #define SYS_exit_group		4246
+#define SYS_epoll_create	4248
+#define SYS_epoll_ctl		4249
+#define SYS_epoll_wait		4250
 #define SYS_timer_create	4257
 #define SYS_timer_settime	4258
 #define SYS_timer_delete	4261
 #define SYS_clock_gettime	4263
 #define SYS_tgkill		4266
+#define SYS_epoll_create1	4326
 #define SYS_pipe2		4328
 
 TEXT runtime·exit(SB),NOSPLIT,$0-4
@@ -482,6 +487,60 @@ TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0-16
 	MOVW	R2, ret+12(FP)
 	RET
 
+// int32 runtime·epollcreate(int32 size);
+TEXT runtime·epollcreate(SB),NOSPLIT,$0-8
+	MOVW	size+0(FP), R4
+	MOVW	$SYS_epoll_create, R2
+	SYSCALL
+	BEQ	R7, 2(PC)
+	SUBU	R2, R0, R2	// caller expects negative errno
+	MOVW	R2, ret+4(FP)
+	RET
+
+// int32 runtime·epollcreate1(int32 flags);
+TEXT runtime·epollcreate1(SB),NOSPLIT,$0-8
+	MOVW	flags+0(FP), R4
+	MOVW	$SYS_epoll_create1, R2
+	SYSCALL
+	BEQ	R7, 2(PC)
+	SUBU	R2, R0, R2	// caller expects negative errno
+	MOVW	R2, ret+4(FP)
+	RET
+
+// func epollctl(epfd, op, fd int32, ev *epollEvent) int
+TEXT runtime·epollctl(SB),NOSPLIT,$0-20
+	MOVW	epfd+0(FP), R4
+	MOVW	op+4(FP), R5
+	MOVW	fd+8(FP), R6
+	MOVW	ev+12(FP), R7
+	MOVW	$SYS_epoll_ctl, R2
+	SYSCALL
+	SUBU	R2, R0, R2	// caller expects negative errno
+	MOVW	R2, ret+16(FP)
+	RET
+
+// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
+TEXT runtime·epollwait(SB),NOSPLIT,$0-20
+	MOVW	epfd+0(FP), R4
+	MOVW	ev+4(FP), R5
+	MOVW	nev+8(FP), R6
+	MOVW	timeout+12(FP), R7
+	MOVW	$SYS_epoll_wait, R2
+	SYSCALL
+	BEQ	R7, 2(PC)
+	SUBU	R2, R0, R2	// caller expects negative errno
+	MOVW	R2, ret+16(FP)
+	RET
+
+// void runtime·closeonexec(int32 fd);
+TEXT runtime·closeonexec(SB),NOSPLIT,$0-4
+	MOVW	fd+0(FP), R4	// fd
+	MOVW	$2, R5	// F_SETFD
+	MOVW	$1, R6	// FD_CLOEXEC
+	MOVW	$SYS_fcntl, R2
+	SYSCALL
+	RET
+
 // func sbrk0() uintptr
 TEXT runtime·sbrk0(SB),NOSPLIT,$0-4
 	// Implemented as brk(NULL).
diff --git a/src/runtime/sys_linux_ppc64x.s b/src/runtime/sys_linux_ppc64x.s
index 853008d5fe..2913a05f56 100644
--- a/src/runtime/sys_linux_ppc64x.s
+++ b/src/runtime/sys_linux_ppc64x.s
@@ -21,6 +21,7 @@
 #define SYS_getpid		 20
 #define SYS_kill		 37
 #define SYS_brk			 45
+#define SYS_fcntl		 55
 #define SYS_mmap		 90
 #define SYS_munmap		 91
 #define SYS_setitimer		104
@@ -37,11 +38,15 @@
 #define SYS_futex		221
 #define SYS_sched_getaffinity	223
 #define SYS_exit_group		234
+#define SYS_epoll_create	236
+#define SYS_epoll_ctl		237
+#define SYS_epoll_wait		238
 #define SYS_timer_create	240
 #define SYS_timer_settime	241
 #define SYS_timer_delete	244
 #define SYS_clock_gettime	246
 #define SYS_tgkill		250
+#define SYS_epoll_create1	315
 #define SYS_pipe2		317
 
 TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
@@ -871,6 +876,55 @@ TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
 	MOVW	R3, ret+24(FP)
 	RET
 
+// int32 runtime·epollcreate(int32 size);
+TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
+	MOVW    size+0(FP), R3
+	SYSCALL	$SYS_epoll_create
+	BVC	2(PC)
+	NEG	R3	// caller expects negative errno
+	MOVW	R3, ret+8(FP)
+	RET
+
+// int32 runtime·epollcreate1(int32 flags);
+TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
+	MOVW	flags+0(FP), R3
+	SYSCALL	$SYS_epoll_create1
+	BVC	2(PC)
+	NEG	R3	// caller expects negative errno
+	MOVW	R3, ret+8(FP)
+	RET
+
+// func epollctl(epfd, op, fd int32, ev *epollEvent) int
+TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
+	MOVW	epfd+0(FP), R3
+	MOVW	op+4(FP), R4
+	MOVW	fd+8(FP), R5
+	MOVD	ev+16(FP), R6
+	SYSCALL	$SYS_epoll_ctl
+	NEG	R3	// caller expects negative errno
+	MOVW	R3, ret+24(FP)
+	RET
+
+// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
+TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
+	MOVW	epfd+0(FP), R3
+	MOVD	ev+8(FP), R4
+	MOVW	nev+16(FP), R5
+	MOVW	timeout+20(FP), R6
+	SYSCALL	$SYS_epoll_wait
+	BVC	2(PC)
+	NEG	R3	// caller expects negative errno
+	MOVW	R3, ret+24(FP)
+	RET
+
+// void runtime·closeonexec(int32 fd);
+TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
+	MOVW    fd+0(FP), R3  // fd
+	MOVD    $2, R4  // F_SETFD
+	MOVD    $1, R5  // FD_CLOEXEC
+	SYSCALL	$SYS_fcntl
+	RET
+
 // func sbrk0() uintptr
 TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0
 	// Implemented as brk(NULL).
diff --git a/src/runtime/sys_linux_riscv64.s b/src/runtime/sys_linux_riscv64.s
index f4fb1c124b..afb2d11da9 100644
--- a/src/runtime/sys_linux_riscv64.s
+++ b/src/runtime/sys_linux_riscv64.s
@@ -18,9 +18,13 @@
 #define SYS_clone		220
 #define SYS_close		57
 #define SYS_connect		203
+#define SYS_epoll_create1	20
+#define SYS_epoll_ctl		21
+#define SYS_epoll_pwait		22
 #define SYS_exit		93
 #define SYS_exit_group		94
 #define SYS_faccessat		48
+#define SYS_fcntl		25
 #define SYS_futex		98
 #define SYS_getpid		172
 #define SYS_gettid		178
@@ -574,6 +578,54 @@ TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
 	MOV	A0, ret+24(FP)
 	RET
 
+// func epollcreate(size int32) int32
+TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
+	MOV	$0, A0
+	MOV	$SYS_epoll_create1, A7
+	ECALL
+	MOVW	A0, ret+8(FP)
+	RET
+
+// func epollcreate1(flags int32) int32
+TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
+	MOVW	flags+0(FP), A0
+	MOV	$SYS_epoll_create1, A7
+	ECALL
+	MOVW	A0, ret+8(FP)
+	RET
+
+// func epollctl(epfd, op, fd int32, ev *epollevent) int32
+TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
+	MOVW	epfd+0(FP), A0
+	MOVW	op+4(FP), A1
+	MOVW	fd+8(FP), A2
+	MOV	ev+16(FP), A3
+	MOV	$SYS_epoll_ctl, A7
+	ECALL
+	MOVW	A0, ret+24(FP)
+	RET
+
+// func epollwait(epfd int32, ev *epollevent, nev, timeout int32) int32
+TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
+	MOVW	epfd+0(FP), A0
+	MOV	ev+8(FP), A1
+	MOVW	nev+16(FP), A2
+	MOVW	timeout+20(FP), A3
+	MOV	$0, A4
+	MOV	$SYS_epoll_pwait, A7
+	ECALL
+	MOVW	A0, ret+24(FP)
+	RET
+
+// func closeonexec(int32)
+TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
+	MOVW	fd+0(FP), A0  // fd
+	MOV	$2, A1	// F_SETFD
+	MOV	$1, A2	// FD_CLOEXEC
+	MOV	$SYS_fcntl, A7
+	ECALL
+	RET
+
 // func sbrk0() uintptr
 TEXT runtime·sbrk0(SB),NOSPLIT,$0-8
 	// Implemented as brk(NULL).
diff --git a/src/runtime/sys_linux_s390x.s b/src/runtime/sys_linux_s390x.s
index 777a4747d4..c82cb9b4aa 100644
--- a/src/runtime/sys_linux_s390x.s
+++ b/src/runtime/sys_linux_s390x.s
@@ -17,6 +17,7 @@
 #define SYS_getpid               20
 #define SYS_kill                 37
 #define SYS_brk			 45
+#define SYS_fcntl                55
 #define SYS_mmap                 90
 #define SYS_munmap               91
 #define SYS_setitimer           104
@@ -34,11 +35,15 @@
 #define SYS_sched_getaffinity   240
 #define SYS_tgkill              241
 #define SYS_exit_group          248
+#define SYS_epoll_create        249
+#define SYS_epoll_ctl           250
+#define SYS_epoll_wait          251
 #define SYS_timer_create        254
 #define SYS_timer_settime       255
 #define SYS_timer_delete        258
 #define SYS_clock_gettime       260
 #define SYS_pipe2		325
+#define SYS_epoll_create1       327
 
 TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
 	MOVW	code+0(FP), R2
@@ -584,6 +589,53 @@ TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
 	MOVW	R2, ret+24(FP)
 	RET
 
+// int32 runtime·epollcreate(int32 size);
+TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
+	MOVW    size+0(FP), R2
+	MOVW	$SYS_epoll_create, R1
+	SYSCALL
+	MOVW	R2, ret+8(FP)
+	RET
+
+// int32 runtime·epollcreate1(int32 flags);
+TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
+	MOVW	flags+0(FP), R2
+	MOVW	$SYS_epoll_create1, R1
+	SYSCALL
+	MOVW	R2, ret+8(FP)
+	RET
+
+// func epollctl(epfd, op, fd int32, ev *epollEvent) int
+TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
+	MOVW	epfd+0(FP), R2
+	MOVW	op+4(FP), R3
+	MOVW	fd+8(FP), R4
+	MOVD	ev+16(FP), R5
+	MOVW	$SYS_epoll_ctl, R1
+	SYSCALL
+	MOVW	R2, ret+24(FP)
+	RET
+
+// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
+TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
+	MOVW	epfd+0(FP), R2
+	MOVD	ev+8(FP), R3
+	MOVW	nev+16(FP), R4
+	MOVW	timeout+20(FP), R5
+	MOVW	$SYS_epoll_wait, R1
+	SYSCALL
+	MOVW	R2, ret+24(FP)
+	RET
+
+// void runtime·closeonexec(int32 fd);
+TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
+	MOVW    fd+0(FP), R2  // fd
+	MOVD    $2, R3  // F_SETFD
+	MOVD    $1, R4  // FD_CLOEXEC
+	MOVW	$SYS_fcntl, R1
+	SYSCALL
+	RET
+
 // func sbrk0() uintptr
 TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0-8
 	// Implemented as brk(NULL).