unix: use pipe2 syscall on OpenBSD pipe2 has been available on OpenBSD for some time, all currently supported versions of OpenBSD have an implementataion of it. Change-Id: I740da07139541084f99a4fa4efcf67a591eed9e5 Reviewed-on: https://go-review.googlesource.com/c/sys/+/216244 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>

diff --git a/unix/syscall_openbsd.go b/unix/syscall_openbsd.go
index 2629a32..a266e92 100644
--- a/unix/syscall_openbsd.go
+++ b/unix/syscall_openbsd.go

@@ -72,16 +72,20 @@
 	return &u, nil
 }
 
-//sysnb pipe(p *[2]_C_int) (err error)
 func Pipe(p []int) (err error) {
+	return Pipe2(p, 0)
+}
+
+//sysnb	pipe2(p *[2]_C_int, flags int) (err error)
+func Pipe2(p []int, flags int) error {
 	if len(p) != 2 {
 		return EINVAL
 	}
 	var pp [2]_C_int
-	err = pipe(&pp)
+	err := pipe2(&pp, flags)
 	p[0] = int(pp[0])
 	p[1] = int(pp[1])
-	return
+	return err
 }
 
 //sys Getdents(fd int, buf []byte) (n int, err error)

diff --git a/unix/zsyscall_openbsd_386.go b/unix/zsyscall_openbsd_386.go
index aad7b9c..b44b31a 100644
--- a/unix/zsyscall_openbsd_386.go
+++ b/unix/zsyscall_openbsd_386.go

@@ -350,8 +350,8 @@
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func pipe(p *[2]_C_int) (err error) {
-	_, _, e1 := RawSyscall(SYS_PIPE, uintptr(unsafe.Pointer(p)), 0, 0)
+func pipe2(p *[2]_C_int, flags int) (err error) {
+	_, _, e1 := RawSyscall(SYS_PIPE2, uintptr(unsafe.Pointer(p)), uintptr(flags), 0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}

diff --git a/unix/zsyscall_openbsd_amd64.go b/unix/zsyscall_openbsd_amd64.go
index 365b33d..67f93ee 100644
--- a/unix/zsyscall_openbsd_amd64.go
+++ b/unix/zsyscall_openbsd_amd64.go

@@ -350,8 +350,8 @@
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func pipe(p *[2]_C_int) (err error) {
-	_, _, e1 := RawSyscall(SYS_PIPE, uintptr(unsafe.Pointer(p)), 0, 0)
+func pipe2(p *[2]_C_int, flags int) (err error) {
+	_, _, e1 := RawSyscall(SYS_PIPE2, uintptr(unsafe.Pointer(p)), uintptr(flags), 0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}

diff --git a/unix/zsyscall_openbsd_arm.go b/unix/zsyscall_openbsd_arm.go
index 07cba96..d7c878b 100644
--- a/unix/zsyscall_openbsd_arm.go
+++ b/unix/zsyscall_openbsd_arm.go

@@ -350,8 +350,8 @@
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func pipe(p *[2]_C_int) (err error) {
-	_, _, e1 := RawSyscall(SYS_PIPE, uintptr(unsafe.Pointer(p)), 0, 0)
+func pipe2(p *[2]_C_int, flags int) (err error) {
+	_, _, e1 := RawSyscall(SYS_PIPE2, uintptr(unsafe.Pointer(p)), uintptr(flags), 0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}

diff --git a/unix/zsyscall_openbsd_arm64.go b/unix/zsyscall_openbsd_arm64.go
index 78951ab..8facd69 100644
--- a/unix/zsyscall_openbsd_arm64.go
+++ b/unix/zsyscall_openbsd_arm64.go

@@ -350,8 +350,8 @@
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func pipe(p *[2]_C_int) (err error) {
-	_, _, e1 := RawSyscall(SYS_PIPE, uintptr(unsafe.Pointer(p)), 0, 0)
+func pipe2(p *[2]_C_int, flags int) (err error) {
+	_, _, e1 := RawSyscall(SYS_PIPE2, uintptr(unsafe.Pointer(p)), uintptr(flags), 0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}