syscall: reuse BSD forkExecPipe for Solaris

The function was duplicated for Solaris. Reuse the BSD version instead.

Change-Id: Ibc812bcf36d21f4a7ceeef7b4fb091fa9479bfa8
Reviewed-on: https://go-review.googlesource.com/81395
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/syscall/exec_solaris.go

@@ -261,17 +261,3 @@ childerror:
 		exit(253)
 	}
 }
-
-// Try to open a pipe with O_CLOEXEC set on both file descriptors.
-func forkExecPipe(p []int) error {
-	err := Pipe(p)
-	if err != nil {
-		return err
-	}
-	_, err = fcntl(p[0], F_SETFD, FD_CLOEXEC)
-	if err != nil {
-		return err
-	}
-	_, err = fcntl(p[1], F_SETFD, FD_CLOEXEC)
-	return err
-}

src/syscall/forkpipe_bsd.go → src/syscall/forkpipe.go

@@ -2,10 +2,11 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly netbsd openbsd
+// +build darwin dragonfly netbsd openbsd solaris
 
 package syscall
 
+// Try to open a pipe with O_CLOEXEC set on both file descriptors.
 func forkExecPipe(p []int) error {
 	err := Pipe(p)
 	if err != nil {