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os: do not use procfs for os.Executable in dragonfly

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procfs(5) is not always mounted in DragonFly BSD, for example during
  the binary package build with synth. os.Executable() consumers
  will then fail, we've spotted this when trying to build tinygo:

    [...]

    copying source files
    ./build/tinygo build-builtins -target=armv6m-none-eabi [...]
    panic: could not get executable path: readlink /proc/curproc/file:
    no such file or directory

    [...]

  Use KERN_PROC_PATHNAME as FreeBSD does.

Change-Id: Ic65bea02cd0309fb24dec8ba8d2b151d1acde67b
GitHub-Last-Rev: 083120a43b
GitHub-Pull-Request: golang/go#36826
Reviewed-on: https://go-review.googlesource.com/c/go/+/216622
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Antonio Huete Jimenez 2020-10-28 11:44:26 +00:00 committed by Brad Fitzpatrick
parent d4c1ad8829
commit e3c58bbeb8
4 changed files with 54 additions and 30 deletions
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12
src/os/executable_dragonfly.go Normal file
View File

@ -0,0 +1,12 @@
// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package os
// From DragonFly's <sys/sysctl.h>
const (
_CTL_KERN = 1
_KERN_PROC = 14
_KERN_PROC_PATHNAME = 9
)

33
src/os/executable_freebsd.go
View File

@ -1,33 +1,12 @@
// Copyright 2016 The Go Authors. All rights reserved.
// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package os
import (
"syscall"
"unsafe"
// From FreeBSD's <sys/sysctl.h>
const (
_CTL_KERN = 1
_KERN_PROC = 14
_KERN_PROC_PATHNAME = 12
)
func executable() (string, error) {
mib := [4]int32{1 /* CTL_KERN */, 14 /* KERN_PROC */, 12 /* KERN_PROC_PATHNAME */, -1}
n := uintptr(0)
// get length
_, _, err := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
if err != 0 {
return "", err
}
if n == 0 { // shouldn't happen
return "", nil
}
buf := make([]byte, n)
_, _, err = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0, 0)
if err != 0 {
return "", err
}
if n == 0 { // shouldn't happen
return "", nil
}
return string(buf[:n-1]), nil
}

4
src/os/executable_procfs.go
View File

@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build linux netbsd dragonfly js,wasm
// +build linux netbsd js,wasm
package os
@ -23,8 +23,6 @@ var executablePath, executablePathErr = func() (string, error) {
procfn = "/proc/self/exe"
case "netbsd":
procfn = "/proc/curproc/exe"
case "dragonfly":
procfn = "/proc/curproc/file"
}
return Readlink(procfn)
}()

35
src/os/executable_sysctl.go Normal file
View File

@ -0,0 +1,35 @@
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build freebsd dragonfly
package os
import (
"syscall"
"unsafe"
)
func executable() (string, error) {
mib := [4]int32{_CTL_KERN, _KERN_PROC, _KERN_PROC_PATHNAME, -1}
n := uintptr(0)
// get length
_, _, err := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
if err != 0 {
return "", err
}
if n == 0 { // shouldn't happen
return "", nil
}
buf := make([]byte, n)
_, _, err = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0, 0)
if err != 0 {
return "", err
}
if n == 0 { // shouldn't happen
return "", nil
}
return string(buf[:n-1]), nil
}