Thanks Ian. I had included that because it seems required in order for me to refer to the return type (C.FILE) and so I can access the underlying C.fopen function. This is the approach I have with open but perhaps this is different. If I'm not supposed to use the include, can you advise how I should refer to the type/function from the header?
Tony On Friday, November 3, 2017 at 8:28:38 PM UTC-4, Ian Lance Taylor wrote: > > On Fri, Nov 3, 2017 at 2:24 PM, <tonywa...@gmail.com <javascript:>> > wrote: > > > > I've been writing a shared-object which I'll use via LD_PRELOAD to > override > > the open syscall. This is currently working OK but now I want to move on > to > > fopen. I've defined it (as far as I can tell) in-line with the stdio > header > > see here. However, when I try and build: > > > > $ go build -buildmode=c-shared > > # github.com/walkert/loader > > In file included from > > $WORK/github.com/walkert/loader/_obj/_cgo_export.c:3:0: > > ./main.go:56:14: error: conflicting types for ‘fopen’ > > In file included from ./main.go:5:0, > > from $WORK/ > github.com/walkert/loader/_obj/_cgo_export.c:3: > > /usr/include/stdio.h:275:14: note: previous declaration of ‘fopen’ was > here > > extern FILE *fopen (const char *__restrict __filename, > > ^~~~~ > > /tmp/go-build775342366/github.com/walkert/loader/_obj/_cgo_export.c:17:7: > > > error: conflicting types for ‘fopen’ > > FILE* fopen(char* p0, char* p1) > > ^~~~~ > > In file included from ./main.go:5:0, > > from $WORK/ > github.com/walkert/loader/_obj/_cgo_export.c:3: > > /usr/include/stdio.h:275:14: note: previous declaration of ‘fopen’ was > here > > extern FILE *fopen (const char *__restrict __filename, > > ^~~~~ > > > > I've seen this before when I was trying to return an int instead of > C.int so > > I have a feeling I'm missing something simple here. Any pointers would > be > > much appreciated. > > It looks like the same file is doing #include <stdio.h> and `//export > fopen`. That won't work, because, as you can see, the definition of > the Go function fopen will conflict with the declaration in stdio.h. > > Ian > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
