solve the undefined: unix.Dup2 compile error on mips64le

[XiaodongLoong]

error in detail:
../internal/remote/output_interceptor_unix.go:41:2: undefined: unix.Dup2
../internal/remote/output_interceptor_unix.go:42:2: undefined: unix.Dup2

there is Dup2 syscall only on amd64, other arch is Dup3 instead.

Signed-off-by: Xiaodong Liu liuxiaodong@loongson.cn

[XiaodongLoong]

Search under ther golang.org/x/sys/unix package, I found only Linux OS with some CPU architectures support the Dup3 syscall including mips64le.

[root@localhost unix]# grep -rn "Dup3" .
./syscall_linux.go:871://sys	Dup3(oldfd int, newfd int, flags int) (err error)
./syscall_linux_arm64.go:155:	return Dup3(oldfd, newfd, 0)
./zsyscall_linux_386.go:331:func Dup3(oldfd int, newfd int, flags int) (err error) {
./zsyscall_linux_mips64le.go:331:func Dup3(oldfd int, newfd int, flags int) (err error) {
./zsyscall_linux_ppc64.go:331:func Dup3(oldfd int, newfd int, flags int) (err error) {
./zsyscall_linux_mips64.go:331:func Dup3(oldfd int, newfd int, flags int) (err error) {
./zsyscall_linux_arm64.go:331:func Dup3(oldfd int, newfd int, flags int) (err error) {
./zsyscall_linux_s390x.go:331:func Dup3(oldfd int, newfd int, flags int) (err error) {
./zsyscall_linux_amd64.go:331:func Dup3(oldfd int, newfd int, flags int) (err error) {
./zsyscall_linux_ppc64le.go:331:func Dup3(oldfd int, newfd int, flags int) (err error) {
./zsyscall_linux_arm.go:331:func Dup3(oldfd int, newfd int, flags int) (err error) {

"arm" "arm64" "386" "s390" "amd64" "ppc64x" support Dup2 syscall on Linux

grep -rn "Dup2" . |grep linux
./syscall_linux_arm.go:86://sys	Dup2(oldfd int, newfd int) (err error)
./syscall_linux_arm64.go:154:func Dup2(oldfd int, newfd int) (err error) {
./zsyscall_linux_386.go:1212:func Dup2(oldfd int, newfd int) (err error) {
./zsyscall_linux_ppc64.go:1209:func Dup2(oldfd int, newfd int) (err error) {
./syscall_linux_386.go:62://sys	Dup2(oldfd int, newfd int) (err error)
./zsyscall_linux_s390x.go:1192:func Dup2(oldfd int, newfd int) (err error) {
./syscall_linux_s390x.go:13://sys	Dup2(oldfd int, newfd int) (err error)
./zsyscall_linux_amd64.go:1192:func Dup2(oldfd int, newfd int) (err error) {
./syscall_linux_ppc64x.go:11://sys	Dup2(oldfd int, newfd int) (err error)
./syscall_linux_amd64.go:11://sys	Dup2(oldfd int, newfd int) (err error)
./zsyscall_linux_ppc64le.go:1209:func Dup2(oldfd int, newfd int) (err error) {
./zsyscall_linux_arm.go:1381:func Dup2(oldfd int, newfd int) (err error) {

other OS can not support Dup3 syscall, but support Dup2 syscall on a few CPU architectures.

[XiaodongLoong]

@onsi PTAL, Thanks!