Hi Max,
Thanks for the suggestion, unfortunately it did not help, see below:
func GetGroupFD(group int, pciDevice *string) (int, error) {
fmt.Printf("VFIO_GROUP_GET_DEVICE_FD() returned: %04x\n",
VFIO_GROUP_GET_DEVICE_FD())
buffer := make([]byte, len(*pciDevice)+1)
for i, c := range *pciDevice {
buffer[i] = uint8(c)
}
buffer[len(*pciDevice)] = 0x0
fmt.Printf("pciDevice: %s\n", string(buffer))
device, _, errno := syscall.Syscall(
syscall.SYS_IOCTL,
uintptr(group),
uintptr(VFIO_GROUP_GET_DEVICE_FD()),
uintptr(unsafe.Pointer(&buffer[0])),
)
if errno != 0 {
return 0, fmt.Errorf("fail to get file descriptor for %d with errno:
%+v", group, errno)
}
return int(device), nil
}
Any other suggestions?
Thank you
Serguei
From: <golang-nuts@googlegroups.com> on behalf of Max
<massimiliano.ghila...@gmail.com>
Date: Thursday, August 23, 2018 at 10:46 AM
To: golang-nuts <golang-nuts@googlegroups.com>
Subject: Re: [go-nuts] Re: Ioctl Syscall with go and c
Hi Serguei,
a Go string or *string do not correspond to a C char *
You must pass the address of the first byte of a sufficiently large buffer:
func GetGroupFD(group int, pciDevice *string) (int, error) {
const N = 256
var buffer [N]byte
device, _, errno := syscall.Syscall(
syscall.SYS_IOCTL,
uintptr(group),
uintptr(unsafe.Pointer(&ioctlId)),
&buffer[0],
)
/* if ioctl() is successful, find '\0' in buffer[] and copy the relevant
portion in *pciDevice */
}
On Thursday, August 23, 2018 at 2:55:29 PM UTC+2, sbez...@cisco.com wrote:
I changed code a little bit to be able to examine variables:
func GetGroupFD(group int, pciDevice *string) (int, error) {
ioctlId := 0x3b6a
var buffer uintptr
buffer = uintptr(unsafe.Pointer(pciDevice))
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