samba - Feb 2007 - VFS module and C++

Hi
I need to write a simple VFS module and I have to use C++ instead of C.
I took sample files, compiled it and everything does work. However, when
I compile it as C++, during the runtime I can see errors in the log:
Can't find a vfs module.
I am not experienced C or C++ programmer in linux environment, probably
I do some silly mistake, but I am really stucked now. I am using Samba
version 3.0.23a. Thanks for any help.
Roman

The fragment of the code looks like this:

extern "C" {
 #include "includes.h"
};

# skeleton methods, tuples are there...

extern "C" {
NTSTATUS init_module(void)
{
        DEBUG(2,("Inicialization does work"));
        return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
"mytest_vfs",
skel_op_tuples);
}
};


And my Makefile:
CC              = gcc
CFLAGS          = -g -O2
CPPFLAGS        LDFLAGS         LDSHFLAGS       = -shared
INSTALLCMD      = /usr/bin/install -c
SAMBA_SOURCE    = ../../source
SHLIBEXT        = so
OBJEXT          = o
FLAGS           = $(CFLAGS) -Iinclude -I$(SAMBA_SOURCE)/include
-I$(SAMBA_SOURCE)/popt -I$(SAMBA_SOURCE)/smbwrapper  -I. $(CPPFLAGS)
-I$(SAMBA_SOURCE) -I/home/roman/ace/ACE_wrappers/TAO/tao -fPIC


prefix          = /usr/local/samba
libdir          = ${prefix}/lib

VFS_LIBDIR      = $(libdir)/vfs

# Auto target
default: $(patsubst %.cpp,%.$(SHLIBEXT),$(wildcard *.cpp))

# Pattern rules

%.$(SHLIBEXT): %.$(OBJEXT)
        @echo "Linking $@"
        @$(CC) $(LDSHFLAGS) $(LDFLAGS) -o $@ $<

%.$(OBJEXT): %.cpp
        @echo "Compiling $<"
        @$(CC) $(FLAGS) -c $<


install: default
        $(INSTALLCMD) -d $(VFS_LIBDIR)
        $(INSTALLCMD) -m 755 *.$(SHLIBEXT) $(VFS_LIBDIR)

# Misc targets
clean:
        rm -rf .libs
        rm -f core *~ *% *.bak *.o *.$(SHLIBEXT)

distclean: clean
        rm config.* Makefile

Hi Roman,
> I need to write a simple VFS module and I have to use C++ instead of C.
> I took sample files, compiled it and everything does work. However, when
> I compile it as C++, during the runtime I can see errors in the log:
> Can't find a vfs module.
> I am not experienced C or C++ programmer in linux environment, probably
> I do some silly mistake, but I am really stucked now. I am using Samba
> version 3.0.23a. Thanks for any help.
> Roman
>
> The fragment of the code looks like this:
>
> extern "C" {
>  #include "includes.h"
> };
>
> # skeleton methods, tuples are there...
>
> extern "C" {
> NTSTATUS init_module(void)
> {
>         DEBUG(2,("Inicialization does work"));
>         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
"mytest_vfs",
> skel_op_tuples);
> }
> };
>
>
> And my Makefile:
> CC              = gcc
This doesn't look good. You need to use g++ to compile C++.
> CFLAGS          = -g -O2
> CPPFLAGS        > LDFLAGS         > LDSHFLAGS       = -shared
> INSTALLCMD      = /usr/bin/install -c
> SAMBA_SOURCE    = ../../source
> SHLIBEXT        = so
> OBJEXT          = o
> FLAGS           = $(CFLAGS) -Iinclude -I$(SAMBA_SOURCE)/include
> -I$(SAMBA_SOURCE)/popt -I$(SAMBA_SOURCE)/smbwrapper  -I. $(CPPFLAGS)
> -I$(SAMBA_SOURCE) -I/home/roman/ace/ACE_wrappers/TAO/tao -fPIC
>
>
> prefix          = /usr/local/samba
> libdir          = ${prefix}/lib
>
> VFS_LIBDIR      = $(libdir)/vfs
>
> # Auto target
> default: $(patsubst %.cpp,%.$(SHLIBEXT),$(wildcard *.cpp))
>
> # Pattern rules
>
> %.$(SHLIBEXT): %.$(OBJEXT)
>         @echo "Linking $@"
>         @$(CC) $(LDSHFLAGS) $(LDFLAGS) -o $@ $<
>
> %.$(OBJEXT): %.cpp
>         @echo "Compiling $<"
>         @$(CC) $(FLAGS) -c $<
>
>
> install: default
>         $(INSTALLCMD) -d $(VFS_LIBDIR)
>         $(INSTALLCMD) -m 755 *.$(SHLIBEXT) $(VFS_LIBDIR)
>
> # Misc targets
> clean:
>         rm -rf .libs
>         rm -f core *~ *% *.bak *.o *.$(SHLIBEXT)
>
> distclean: clean
>         rm config.* Makefile
Laurent Pinchart

I have found solution, it is necessary to add -lstdc++ to the linker.
Also good idea is to check and increase log level in smb.conf
Roman
>Hi
>I need to write a simple VFS module and I have to use C++ instead of C.
>I took sample files, compiled it and everything does work. However, when
>I compile it as C++, during the runtime I can see errors in the log:
>Can't find a vfs module.
>I am not experienced C or C++ programmer in linux environment, probably
>I do some silly mistake, but I am really stucked now. I am using Samba
>version 3.0.23a. Thanks for any help.
>Roman
>
>The fragment of the code looks like this:
>
>extern "C" {
> #include "includes.h"
>};
>
># skeleton methods, tuples are there...
>
>extern "C" {
>NTSTATUS init_module(void)
>{
>        DEBUG(2,("Inicialization does work"));
>        return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
"mytest_vfs",
>skel_op_tuples);
>}
>};
>
>
>And my Makefile:
>CC              = gcc
>CFLAGS          = -g -O2
>CPPFLAGS        >LDFLAGS         >LDSHFLAGS       = -shared
>INSTALLCMD      = /usr/bin/install -c
>SAMBA_SOURCE    = ../../source
>SHLIBEXT        = so
>OBJEXT          = o
>FLAGS           = $(CFLAGS) -Iinclude -I$(SAMBA_SOURCE)/include
>-I$(SAMBA_SOURCE)/popt -I$(SAMBA_SOURCE)/smbwrapper  -I. $(CPPFLAGS)
>-I$(SAMBA_SOURCE) -I/home/roman/ace/ACE_wrappers/TAO/tao -fPIC
>
>
>prefix          = /usr/local/samba
>libdir          = ${prefix}/lib
>
>VFS_LIBDIR      = $(libdir)/vfs
>
># Auto target
>default: $(patsubst %.cpp,%.$(SHLIBEXT),$(wildcard *.cpp))
>
># Pattern rules
>
>%.$(SHLIBEXT): %.$(OBJEXT)
>        @echo "Linking $@"
>        @$(CC) $(LDSHFLAGS) $(LDFLAGS) -o $@ $<
>
>%.$(OBJEXT): %.cpp
>        @echo "Compiling $<"
>        @$(CC) $(FLAGS) -c $<
>
>
>install: default
>        $(INSTALLCMD) -d $(VFS_LIBDIR)
>        $(INSTALLCMD) -m 755 *.$(SHLIBEXT) $(VFS_LIBDIR)
>
># Misc targets
>clean:
>        rm -rf .libs
>        rm -f core *~ *% *.bak *.o *.$(SHLIBEXT)
>
>distclean: clean
>        rm config.* Makefile
>
>  
>

-- 
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