Re: [PATCH v5 BlueZ] Provide GNU basename compatible implementation

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Hi Khem,

On Wed, Aug 28, 2024 at 10:20 AM Khem Raj <raj.khem@xxxxxxxxx> wrote:
>
> On Wed, Aug 28, 2024 at 7:07 AM Luiz Augusto von Dentz
> <luiz.dentz@xxxxxxxxx> wrote:
> >
> > Hi Khem,
> >
> > On Wed, Aug 28, 2024 at 12:17 AM Khem Raj <raj.khem@xxxxxxxxx> wrote:
> > >
> > > Call to basename() relies on a GNU extension
> > > to take a const char * vs a char *. Let's define
> > > a trivial helper function to ensure compatibility
> > > with musl.
> > >
> > > Fixes Issue: https://github.com/bluez/bluez/issues/843
> > > ---
> > > v2: Fix code formatter reported errors
> > > v3: Make just node_name as const and keep node_dir as such
> > > v4: Fix code formatting errors
> > > v5: Redo the patch to address textrels seen on ppc32/arm
> >
> > Not really sure why you went with something completely different then
> > the util helper?
>
> util helper meant that we need to add -I option to build the utilities
> needing this function from util,h
> and this -I was causing more stuff to be included into these binaries,
> It got caught when building for ppc32
> since yocto build started failing due to textrels and I realized that
> specifying -I can open up the possibility of
> wrong includes coming from src/ dir. Thats the reason I went with the
> alternative approach which is safer
> although the function is copied twice.

Where did you see this error? Perhaps we need to include such a build
into our own CI then, anyway it seems fair enough but Id add some
comment about it, also the other possibility would be to add something
like l_path_basename to libell but I guess that comes with its own
problem since we would need to uprev the ell dependency.

>
> >
> > >  configure.ac            | 11 ++++++++++-
> > >  mesh/mesh-config-json.c |  4 +++-
> > >  mesh/missing.h          | 21 +++++++++++++++++++++
> > >  mesh/rpl.c              |  1 +
> > >  tools/hex2hcd.c         |  1 +
> > >  tools/missing.h         | 21 +++++++++++++++++++++
> > >  6 files changed, 57 insertions(+), 2 deletions(-)
> > >  create mode 100644 mesh/missing.h
> > >  create mode 100644 tools/missing.h
> > >
> > > diff --git a/configure.ac b/configure.ac
> > > index d31eb1656..f0f1ec100 100644
> > > --- a/configure.ac
> > > +++ b/configure.ac
> > > @@ -70,7 +70,16 @@ AC_CHECK_LIB(pthread, pthread_create, dummy=yes,
> > >  AC_CHECK_LIB(dl, dlopen, dummy=yes,
> > >                         AC_MSG_ERROR(dynamic linking loader is required))
> > >
> > > -AC_CHECK_HEADERS(linux/types.h linux/if_alg.h linux/uinput.h linux/uhid.h sys/random.h)
> > > +AC_CHECK_HEADERS(string.h linux/types.h linux/if_alg.h linux/uinput.h linux/uhid.h sys/random.h)
> > > +
> > > +# basename may be only available in libgen.h with the POSIX behavior,
> > > +# not desired here
> > > +AC_CHECK_DECLS([basename], [],
> > > +                               AC_MSG_WARN([GNU basename extension not found]),
> > > +                               [#define _GNU_SOURCE 1
> > > +                                #include <string.h>
> > > +                                ])
> > > +
> > >
> > >  PKG_CHECK_MODULES(GLIB, glib-2.0 >= 2.28)
> > >
> > > diff --git a/mesh/mesh-config-json.c b/mesh/mesh-config-json.c
> > > index c198627c6..e3b0a1809 100644
> > > --- a/mesh/mesh-config-json.c
> > > +++ b/mesh/mesh-config-json.c
> > > @@ -28,6 +28,7 @@
> > >  #include <ell/ell.h>
> > >  #include <json-c/json.h>
> > >
> > > +#include "mesh/missing.h"
> > >  #include "mesh/mesh-defs.h"
> > >  #include "mesh/util.h"
> > >  #include "mesh/mesh-config.h"
> > > @@ -2694,7 +2695,8 @@ bool mesh_config_load_nodes(const char *cfgdir_name, mesh_config_node_func_t cb,
> > >
> > >  void mesh_config_destroy_nvm(struct mesh_config *cfg)
> > >  {
> > > -       char *node_dir, *node_name;
> > > +       char *node_dir;
> > > +       const char* node_name;
> > >         char uuid[33];
> > >
> > >         if (!cfg)
> > > diff --git a/mesh/missing.h b/mesh/missing.h
> > > new file mode 100644
> > > index 000000000..eaf32815e
> > > --- /dev/null
> > > +++ b/mesh/missing.h
> > > @@ -0,0 +1,21 @@
> > > +// SPDX-License-Identifier: LGPL-2.1-or-later
> > > +/*
> > > + *
> > > + *  BlueZ - Bluetooth protocol stack for Linux
> > > + *
> > > + *  Copyright (C) 2024  Khem Raj <raj.khem@xxxxxxxxx>
> > > + *
> > > + */
> > > +
> > > +#ifdef HAVE_CONFIG_H
> > > +#include <config.h>
> > > +#endif
> > > +#if !HAVE_DECL_BASENAME
> > > +#include <string.h>
> > > +static inline const char *basename(const char *path)
> > > +{
> > > +  const char *base = strrchr(path, '/');
> > > +
> > > +  return base ? base + 1 : path;
> > > +}
> > > +#endif
> > > diff --git a/mesh/rpl.c b/mesh/rpl.c
> > > index fb225dddd..2fa17d72f 100644
> > > --- a/mesh/rpl.c
> > > +++ b/mesh/rpl.c
> > > @@ -24,6 +24,7 @@
> > >
> > >  #include <ell/ell.h>
> > >
> > > +#include "mesh/missing.h"
> > >  #include "mesh/mesh-defs.h"
> > >
> > >  #include "mesh/node.h"
> > > diff --git a/tools/hex2hcd.c b/tools/hex2hcd.c
> > > index e6dca5a81..452ab2beb 100644
> > > --- a/tools/hex2hcd.c
> > > +++ b/tools/hex2hcd.c
> > > @@ -24,6 +24,7 @@
> > >  #include <stdlib.h>
> > >  #include <stdbool.h>
> > >  #include <sys/stat.h>
> > > +#include "tools/missing.h"
> > >
> > >  static ssize_t process_record(int fd, const char *line, uint16_t *upper_addr)
> > >  {
> > > diff --git a/tools/missing.h b/tools/missing.h
> > > new file mode 100644
> > > index 000000000..eaf32815e
> > > --- /dev/null
> > > +++ b/tools/missing.h
> > > @@ -0,0 +1,21 @@
> > > +// SPDX-License-Identifier: LGPL-2.1-or-later
> > > +/*
> > > + *
> > > + *  BlueZ - Bluetooth protocol stack for Linux
> > > + *
> > > + *  Copyright (C) 2024  Khem Raj <raj.khem@xxxxxxxxx>
> > > + *
> > > + */
> > > +
> > > +#ifdef HAVE_CONFIG_H
> > > +#include <config.h>
> > > +#endif
> > > +#if !HAVE_DECL_BASENAME
> > > +#include <string.h>
> > > +static inline const char *basename(const char *path)
> > > +{
> > > +  const char *base = strrchr(path, '/');
> > > +
> > > +  return base ? base + 1 : path;
> > > +}
> > > +#endif
> > >
> >
> >
> > --
> > Luiz Augusto von Dentz



-- 
Luiz Augusto von Dentz





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