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unix: add ProcessVMReadv and ProcessVMWritev on linux

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These are Linux-specific system calls for efficiently reading and
writing memory in foreign processes.

A new RemoteIovec type is added for use in these wrappers, as Iovec's
Base field is a pointer, and creating invalid pointers is invalid in
Go.

Change-Id: I329501ab7b4df9d0aebe289369d3a5f77120af02
GitHub-Last-Rev: 262aabed02
GitHub-Pull-Request: golang/sys#74
Reviewed-on: https://go-review.googlesource.com/c/sys/+/243497
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Tadeo Kondrak
2020-07-20 19:57:24 +00:00
committed by Ian Lance Taylor
parent ddb9806d33
commit cb9d2d5c56
2 changed files with 58 additions and 0 deletions
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12
unix/syscall_linux.go
View File

@@ -2122,6 +2122,18 @@ func Klogset(typ int, arg int) (err error) {
return nil
}
// RemoteIovec is Iovec with the pointer replaced with an integer.
// It is used for ProcessVMReadv and ProcessVMWritev, where the pointer
// refers to a location in a different process' address space, which
// would confuse the Go garbage collector.
type RemoteIovec struct {
Base uintptr
Len int
}
//sys ProcessVMReadv(pid int, localIov []Iovec, remoteIov []RemoteIovec, flags uint) (n int, err error) = SYS_PROCESS_VM_READV
//sys ProcessVMWritev(pid int, localIov []Iovec, remoteIov []RemoteIovec, flags uint) (n int, err error) = SYS_PROCESS_VM_WRITEV
/*
* Unimplemented
*/

46
unix/zsyscall_linux.go
View File

@@ -1847,6 +1847,52 @@ func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error)
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func ProcessVMReadv(pid int, localIov []Iovec, remoteIov []RemoteIovec, flags uint) (n int, err error) {
var _p0 unsafe.Pointer
if len(localIov) > 0 {
_p0 = unsafe.Pointer(&localIov[0])
} else {
_p0 = unsafe.Pointer(&_zero)
}
var _p1 unsafe.Pointer
if len(remoteIov) > 0 {
_p1 = unsafe.Pointer(&remoteIov[0])
} else {
_p1 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PROCESS_VM_READV, uintptr(pid), uintptr(_p0), uintptr(len(localIov)), uintptr(_p1), uintptr(len(remoteIov)), uintptr(flags))
n = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func ProcessVMWritev(pid int, localIov []Iovec, remoteIov []RemoteIovec, flags uint) (n int, err error) {
var _p0 unsafe.Pointer
if len(localIov) > 0 {
_p0 = unsafe.Pointer(&localIov[0])
} else {
_p0 = unsafe.Pointer(&_zero)
}
var _p1 unsafe.Pointer
if len(remoteIov) > 0 {
_p1 = unsafe.Pointer(&remoteIov[0])
} else {
_p1 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall6(SYS_PROCESS_VM_WRITEV, uintptr(pid), uintptr(_p0), uintptr(len(localIov)), uintptr(_p1), uintptr(len(remoteIov)), uintptr(flags))
n = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func pipe2(p *[2]_C_int, flags int) (err error) {
_, _, e1 := RawSyscall(SYS_PIPE2, uintptr(unsafe.Pointer(p)), uintptr(flags), 0)
if e1 != 0 {