tree e0653dcad39586e3a708ee258168c41bd6f14c77
parent 2feb2cc450e1925b9359957c90bae27e01662171
author Tobias Klauser <tklauser@distanz.ch> 1634135416 +0200
committer Tobias Klauser <tobias.klauser@gmail.com> 1634216968 +0000

syscall: use fcntl with F_DUP2FD_CLOEXEC in forkAndExecInChild on FreeBSD

Use fcntl(oldfd, F_DUP2FD_CLOEXEC, newfd) to duplicate the file
descriptor and mark is as close-on-exec instead of dup2 & fcntl.

FreeBSD implements dup3 like this in libc.

Change-Id: I36e37bc61c2e31561adb49001f287764125a74de
Reviewed-on: https://go-review.googlesource.com/c/go/+/355571
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>