Hey Guys,
I'm in trouble in the same issue. My code as the following:
test.go
```go
name := []string{"gpu0", "gpu1", "gpu2", "gpu3"}
matrix := [3][3]int{{1, 0, 0}, {3, 3, 0}, {3, 3, 2}}
C.test_settopologyresource(mod, C.CString("node1"), C.int(2),
(**C.char)(unsafe.Pointer(&name[0])),
(**C.int)(unsafe.Pointer(&matrix[0][0])))
```
xxx.c
```c
bool test_settopologyresource(bsagomodule* _self, char* _nodename,
int _resourceindex, char** _nameunits, int** _levelmatrix) {
printf("\n set topology resource-> node:%s, resource index:%d",
_nodename, _resourceindex);
bool result = settopologyresource(_self->client, _nodename,
_resourceindex, _nameunits, _levelmatrix);
return result;
}
```
But when I execute `go run test.go`, got the below errors:
```
go run test.go
fatal error: unexpected signal during runtime execution
[signal SIGSEGV: segmentation violation code=0x1 addr=0xc pc=0x7f5e655089da]
runtime stack:
runtime.throw(0x4b1190, 0x2a)
/usr/local/go/src/runtime/panic.go:596 +0x95
runtime.sigpanic()
/usr/local/go/src/runtime/signal_unix.go:274 +0x2db
goroutine 1 [syscall, locked to thread]:
runtime.cgocall(0x481400, 0xc42004f668, 0x4b0f76)
/usr/local/go/src/runtime/cgocall.go:131 +0xe2 fp=0xc42004f628
sp=0xc42004f5e8
main._Cfunc_bsagomodule_settopologyresource(0x1226440, 0x122d2f0, 0x2,
0xc42001c280, 0xc42005c050, 0x122d200)
command-line-arguments/_obj/_cgo_gotypes.go:174 +0x4a fp=0xc42004f668
sp=0xc42004f628
main.main.func8(0x1226440, 0x122d2f0, 0x2, 0xc42001c280, 0xc42005c050, 0x0)
/home/zhangjian/project/k8s_bsamodule/test/test.go:94 +0xf4 fp=0xc42004f6a8
sp=0xc42004f668
main.main()
/home/zhangjian/project/k8s_bsamodule/test/test.go:96 +0xeca
fp=0xc42004ff88 sp=0xc42004f6a8
runtime.main()
/usr/local/go/src/runtime/proc.go:185 +0x20a fp=0xc42004ffe0 sp=0xc42004ff88
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:2197 +0x1 fp=0xc42004ffe8
sp=0xc42004ffe0
goroutine 17 [syscall, locked to thread]:
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:2197 +0x1
exit status 2
```
Have any ways to solve this problem?
Thanks a lot!
在 2015年12月10日星期四 UTC+8上午3:07:17，Ian Lance Taylor写道：
>
> On Wed, Dec 9, 2015 at 6:27 AM, Cobb Liu <keyc...@gmail.com <javascript:>>
> wrote:
> > My code is :
> >
> > package main
> >
> > /*
> > #include <stdio.h>
> > #include <string.h>
> >
> > void fill_2d_array(char (*s)[16]) {
> > strcpy(s[0], "hello");
> > strcpy(s[1],"cgo");
> > }
> > */
> > import "C"
> > import "fmt"
> > import "unsafe"
> >
> > func main() {
> > dirs := make([][]byte, 4)
> > for i := 0; i < 4; i++ {
> > dirs[i] = make([]byte, 16)
> > }
> > C.fill_2d_array(((*C.char)[16])(unsafe.Pointer(&dirs)))
> >
> > fmt.Println(dirs)
> > }
> >
> > when I run with 'go run test.go', it failed and said:
> > # go run test.go
> > ./test.go:21: type *C.char is not an expression
> >
> >
> > How can I pass a 2 dimensional slice to a C function like
> 'fill_2d_array'
> > above as a parameter?
>
> This code looks wrong at several levels.
>
> It looks like you are trying to write a Go type (*C.char)[16]. That's
> not a Go type. A Go type would be [16]*C.char. But you need a
> pointer, so you probably want *[16]*C.char. But that doesn't match
> your C code. Your C code is expecting a pointer to an array of 16
> chars, which in Go would be written as *[16]C.char. The strcpy to
> s[0] is working because in C arrays decay to pointers, so the C code
> is effectively **C.char and s[0] is *C.char. But none of this matches
> what Go is passing, since a slice is not a pointer.
>
> Ian
>
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