net, internal/poll, net/internal/socktest: use SOCK_{CLOEXEC,NONBLOCK} accept4/socket flags on OpenBSD

The SOCK_CLOEXEC and SOCK_NONBLOCK flags to the socket syscall and the
accept4 syscall are supported since OpenBSD 5.7.

Follows CL 40895 and CL 94295

Change-Id: Icaf35ace2ef5e73279a70d4f1a9fbf3be9371e6c
Reviewed-on: https://go-review.googlesource.com/97196
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/internal/poll/hook_cloexec.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build dragonfly freebsd linux netbsd
+// +build dragonfly freebsd linux netbsd openbsd
 
 package poll
 

src/internal/poll/sock_cloexec.go

@@ -5,7 +5,7 @@
 // This file implements sysSocket and accept for platforms that
 // provide a fast path for setting SetNonblock and CloseOnExec.
 
-// +build dragonfly freebsd linux netbsd
+// +build dragonfly freebsd linux netbsd openbsd
 
 package poll
 

src/internal/poll/sys_cloexec.go

@@ -5,7 +5,7 @@
 // This file implements sysSocket and accept for platforms that do not
 // provide a fast path for setting SetNonblock and CloseOnExec.
 
-// +build darwin nacl openbsd solaris
+// +build darwin nacl solaris
 
 package poll
 

src/net/internal/socktest/sys_cloexec.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build dragonfly freebsd linux netbsd
+// +build dragonfly freebsd linux netbsd openbsd
 
 package socktest
 

src/net/main_cloexec_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build dragonfly freebsd linux netbsd
+// +build dragonfly freebsd linux netbsd openbsd
 
 package net
 

src/net/sock_cloexec.go

@@ -5,7 +5,7 @@
 // This file implements sysSocket and accept for platforms that
 // provide a fast path for setting SetNonblock and CloseOnExec.
 
-// +build dragonfly freebsd linux netbsd
+// +build dragonfly freebsd linux netbsd openbsd
 
 package net
 

src/net/sys_cloexec.go

@@ -5,7 +5,7 @@
 // This file implements sysSocket and accept for platforms that do not
 // provide a fast path for setting SetNonblock and CloseOnExec.
 
-// +build darwin nacl openbsd solaris
+// +build darwin nacl solaris
 
 package net
 

src/syscall/syscall_openbsd.go

@@ -74,6 +74,25 @@ func Pipe(p []int) (err error) {
 	return
 }
 
+//sys	accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error)
+func Accept4(fd, flags int) (nfd int, sa Sockaddr, err error) {
+	var rsa RawSockaddrAny
+	var len _Socklen = SizeofSockaddrAny
+	nfd, err = accept4(fd, &rsa, &len, flags)
+	if err != nil {
+		return
+	}
+	if len > SizeofSockaddrAny {
+		panic("RawSockaddrAny too small")
+	}
+	sa, err = anyToSockaddr(&rsa)
+	if err != nil {
+		Close(nfd)
+		nfd = 0
+	}
+	return
+}
+
 //sys getdents(fd int, buf []byte) (n int, err error)
 func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
 	return getdents(fd, buf)

src/syscall/zerrors_openbsd_386.go

@@ -1177,7 +1177,9 @@ const (
 	SIOCSSPPPPARAMS                   = 0x80206993
 	SIOCSVH                           = 0xc02069f5
 	SIOCSVNETID                       = 0x802069a6
+	SOCK_CLOEXEC                      = 0x8000
 	SOCK_DGRAM                        = 0x2
+	SOCK_NONBLOCK                     = 0x4000
 	SOCK_RAW                          = 0x3
 	SOCK_RDM                          = 0x4
 	SOCK_SEQPACKET                    = 0x5

src/syscall/zerrors_openbsd_amd64.go

@@ -1176,7 +1176,9 @@ const (
 	SIOCSSPPPPARAMS                   = 0x80206993
 	SIOCSVH                           = 0xc02069f5
 	SIOCSVNETID                       = 0x802069a6
+	SOCK_CLOEXEC                      = 0x8000
 	SOCK_DGRAM                        = 0x2
+	SOCK_NONBLOCK                     = 0x4000
 	SOCK_RAW                          = 0x3
 	SOCK_RDM                          = 0x4
 	SOCK_SEQPACKET                    = 0x5

src/syscall/zsyscall_openbsd_386.go

@@ -271,6 +271,17 @@ func pipe(p *[2]_C_int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error) {
+	r0, _, e1 := Syscall6(SYS_ACCEPT4, uintptr(fd), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0)
+	nfd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func getdents(fd int, buf []byte) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(buf) > 0 {

src/syscall/zsyscall_openbsd_amd64.go

@@ -271,6 +271,17 @@ func pipe(p *[2]_C_int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error) {
+	r0, _, e1 := Syscall6(SYS_ACCEPT4, uintptr(fd), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0)
+	nfd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func getdents(fd int, buf []byte) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(buf) > 0 {

src/syscall/zsyscall_openbsd_arm.go

@@ -271,6 +271,17 @@ func pipe(p *[2]_C_int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error) {
+	r0, _, e1 := Syscall6(SYS_ACCEPT4, uintptr(fd), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0)
+	nfd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func getdents(fd int, buf []byte) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(buf) > 0 {

src/syscall/zsysnum_openbsd_386.go

@@ -94,6 +94,7 @@ const (
 	SYS_DUP2           = 90  // { int sys_dup2(int from, int to); }
 	SYS_NANOSLEEP      = 91  // { int sys_nanosleep(const struct timespec *rqtp, \
 	SYS_FCNTL          = 92  // { int sys_fcntl(int fd, int cmd, ... void *arg); }
+	SYS_ACCEPT4        = 93  // { int sys_accept4(int s, struct sockaddr *name, \
 	SYS___THRSLEEP     = 94  // { int sys___thrsleep(const volatile void *ident, \
 	SYS_FSYNC          = 95  // { int sys_fsync(int fd); }
 	SYS_SETPRIORITY    = 96  // { int sys_setpriority(int which, id_t who, int prio); }

src/syscall/zsysnum_openbsd_amd64.go

@@ -94,6 +94,7 @@ const (
 	SYS_DUP2           = 90  // { int sys_dup2(int from, int to); }
 	SYS_NANOSLEEP      = 91  // { int sys_nanosleep(const struct timespec *rqtp, \
 	SYS_FCNTL          = 92  // { int sys_fcntl(int fd, int cmd, ... void *arg); }
+	SYS_ACCEPT4        = 93  // { int sys_accept4(int s, struct sockaddr *name, \
 	SYS___THRSLEEP     = 94  // { int sys___thrsleep(const volatile void *ident, \
 	SYS_FSYNC          = 95  // { int sys_fsync(int fd); }
 	SYS_SETPRIORITY    = 96  // { int sys_setpriority(int which, id_t who, int prio); }