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syscall: support Getwd on all BSDs

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All supported BSDs provide the SYS___GETCWD syscall which can be used to
implement syscall.Getwd. With this change os.Getwd can use a single
syscall instead of falling back to the current kludge solution on the
BSDs.

This doesn't add any new exported functions to the frozen syscall
package, only ImplementsGetwd changes to true for dragonfly, freebsd,
netbsd and openbsd.

As suggested by Ian, this follows CL 83755 which did the same for
golang.org/x/sys/unix.

Also, an entry for netbsd/arm is added to mkall.sh which was used to
generate the syscall wrappers there.

Change-Id: I84da1ec61a6b8625443699a63cde556b6442ad41
Reviewed-on: https://go-review.googlesource.com/84484
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Tobias Klauser 2017-12-14 11:59:33 +01:00 • committed by Tobias Klauser
parent dc27d68936
commit acd17e9b2b
34 changed files with 292 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

17
src/syscall/zsyscall_netbsd_386.go
View file

@ -1232,3 +1232,20 @@ func utimensat(dirfd int, path string, times *[2]Timespec, flag int) (err error)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func getcwd(buf []byte) (n int, err error) {
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
} else {
_p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS___GETCWD, uintptr(_p0), uintptr(len(buf)), 0)
n = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}