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>

15 files changed, 65 insertions, 7 deletions

diff --git a/src/internal/poll/hook_cloexec.go b/src/internal/poll/hook_cloexec.go
index 4b670b9d0e..5c93bdaf6c 100644
--- a/src/internal/poll/hook_cloexec.go
+++ b/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
 
diff --git a/src/internal/poll/sock_cloexec.go b/src/internal/poll/sock_cloexec.go
index e46b4d3032..691cb8e36f 100644
--- a/src/internal/poll/sock_cloexec.go
+++ b/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
 
diff --git a/src/internal/poll/sys_cloexec.go b/src/internal/poll/sys_cloexec.go
index 4755dc3e53..3a25b13bb5 100644
--- a/src/internal/poll/sys_cloexec.go
+++ b/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
 
diff --git a/src/net/internal/socktest/sys_cloexec.go b/src/net/internal/socktest/sys_cloexec.go
index 3d70a4f026..986d89471b 100644
--- a/src/net/internal/socktest/sys_cloexec.go
+++ b/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
 
diff --git a/src/net/main_cloexec_test.go b/src/net/main_cloexec_test.go
index c35c3b2673..5398f9eae1 100644
--- a/src/net/main_cloexec_test.go
+++ b/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
 
diff --git a/src/net/sock_cloexec.go b/src/net/sock_cloexec.go
index e224a5fb41..0c883dc338 100644
--- a/src/net/sock_cloexec.go
+++ b/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
 
diff --git a/src/net/sys_cloexec.go b/src/net/sys_cloexec.go
index fe6b0cc764..7ab1407de9 100644
--- a/src/net/sys_cloexec.go
+++ b/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
 
diff --git a/src/syscall/syscall_openbsd.go b/src/syscall/syscall_openbsd.go
index d65e6a51fe..1a9b7644a9 100644
--- a/src/syscall/syscall_openbsd.go
+++ b/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)
diff --git a/src/syscall/zerrors_openbsd_386.go b/src/syscall/zerrors_openbsd_386.go
index 540d310e9f..5a7cdf2b65 100644
--- a/src/syscall/zerrors_openbsd_386.go
+++ b/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
diff --git a/src/syscall/zerrors_openbsd_amd64.go b/src/syscall/zerrors_openbsd_amd64.go
index ae5b8c955a..11fc1e3a16 100644
--- a/src/syscall/zerrors_openbsd_amd64.go
+++ b/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
diff --git a/src/syscall/zsyscall_openbsd_386.go b/src/syscall/zsyscall_openbsd_386.go
index 3a46b94fa2..2e619472d9 100644
--- a/src/syscall/zsyscall_openbsd_386.go
+++ b/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 {
diff --git a/src/syscall/zsyscall_openbsd_amd64.go b/src/syscall/zsyscall_openbsd_amd64.go
index 6bca25140b..b749b88d90 100644
--- a/src/syscall/zsyscall_openbsd_amd64.go
+++ b/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 {
diff --git a/src/syscall/zsyscall_openbsd_arm.go b/src/syscall/zsyscall_openbsd_arm.go
index 4ce317c1b0..69f4823e16 100644
--- a/src/syscall/zsyscall_openbsd_arm.go
+++ b/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 {
diff --git a/src/syscall/zsysnum_openbsd_386.go b/src/syscall/zsysnum_openbsd_386.go
index c172534aeb..f9331fc57b 100644
--- a/src/syscall/zsysnum_openbsd_386.go
+++ b/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); }
diff --git a/src/syscall/zsysnum_openbsd_amd64.go b/src/syscall/zsysnum_openbsd_amd64.go
index 356c187375..3ebb1c4e82 100644
--- a/src/syscall/zsysnum_openbsd_amd64.go
+++ b/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); }