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x/sys/unix: add Dup2 wrapper for arm64/ppc64

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arm64 doesn't have a Dup2 syscall, instead Dup3 is supposed
to be used. Since Dup3 is linux-specific, provide a wrapper
to make writing portable code easier.

    Updates golang/go#10235

To verify it, added a testcase for Dup and Dup2.

Change-Id: I066bb60d62b2bd64d7ba0fdfbb334ce2213c78e9
Reviewed-on: https://go-review.googlesource.com/20178
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Riku Voipio <riku.voipio@linaro.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Riku Voipio
2016-03-15 15:33:18 +00:00
committed by Brad Fitzpatrick
parent 7a56174f00
commit 9d4e42a206
5 changed files with 60 additions and 0 deletions
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unix/zsyscall_linux_ppc64le.go
+10
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@@ -1216,6 +1216,16 @@ func Munlockall() (err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func Dup2(oldfd int, newfd int) (err error) {
_, _, e1 := Syscall(SYS_DUP2, uintptr(oldfd), uintptr(newfd), 0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 {