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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: 262aabed02cc1f604e85fa1b4be1b874c57bd666
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 21:16:30 +00:00
committed by Ian Lance Taylor
parent ddb9806d33
commit cb9d2d5c56
2 changed files with 58 additions and 0 deletions
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unix/syscall_linux.go
+12
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@@ -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
*/