make the return type in your go program C.int and it'll compile. then using LD_PRELOAD against the so should work.
On Monday, May 8, 2017 at 5:44:09 PM UTC-4, Tony Walker wrote: > > Hi All, > > I'd like to experiment writing a shared library that will override system > functions via LD_LIBRARY_PATH. I'd like to achieve something like the basic > functionality demonstrated here where rand() is overridden. > > If I write a simple function to overwrite it (see here > <https://play.golang.org/p/PF76cJVO6X>) I get the following error when > trying to compile with go build -o rand.so -buildmode=c-shared test.go (Go > 1.7.4 - same with 1.8 but a slightly different error): > > # command-line-arguments > In file included from $WORK/command-line-arguments/_obj/_cgo_export.c:3:0: > /tmp/go-build613177413/command-line-arguments/_obj/_cgo_export.h:55:14: > error: conflicting types for ‘rand’ > extern GoInt rand(); > ^~~~ > In file included from $WORK/command-line-arguments/_obj/_cgo_export.c:2:0: > /usr/include/stdlib.h:335:12: note: previous declaration of ‘rand’ was here > extern int rand (void) __THROW; > ^~~~ > /tmp/go-build613177413/command-line-arguments/_obj/_cgo_export.c:17:7: > error: conflicting types for ‘rand’ > GoInt rand() > ^~~~ > In file included from $WORK/command-line-arguments/_obj/_cgo_export.c:2:0: > /usr/include/stdlib.h:335:12: note: previous declaration of ‘rand’ was here > extern int rand (void) __THROW; > ^~~~ > I'm not clear whether I simply need to find a way to declare an equivalent > signature which matches the stdlib, or whether creating a function which is > already defined is just not allowed. > > Can anyone help here? > > Thanks, > > Tony > -- 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.
