tests/loadlibrary.at

# loadlibrary.at -- test loadlibrary functionality          -*- Autotest -*-
#
#   Copyright (C) 2010-2019, 2021-2025 Free Software Foundation, Inc.
#   This file is part of GNU Libtool.
#
# GNU Libtool is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of
# the License, or (at your option) any later version.
#
# GNU Libtool is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Libtool.  If not, see <https://www.gnu.org/licenses/>.
####

AT_SETUP([loadlibrary error messages])
AT_KEYWORDS([libltdl])

eval "`$LIBTOOL --config | $EGREP '^(objdir)='`"

AT_DATA([main.c],
[[#include <ltdl.h>
#include <stdio.h>

static int
standard_error_message(const char *error)
{
  int error_number;

  for (error_number = 0; error_number < LT_ERROR_MAX; ++error_number)
    {
      lt_dlseterror (error_number);
      if (error == lt_dlerror ())
	{
	  return 1;
	}
    }

  lt_dlseterror (LT_ERROR_UNKNOWN);
  return 0;
}

int
main (int argc, char* argv[])
{
  int err = 0;
  lt_dlhandle module = NULL;
  const lt_dlvtable *loadlibrary;
  const lt_dlvtable *preopen;
  lt_dlloader loader = NULL;
  lt_dlloader next;
  const lt_dlvtable *vtable;
  void *symbol;
  const char *error;

  if (argc < 2)
    {
      fprintf (stderr, "usage: %s plugin [symbol]\n", argv[0]);
      return 1;
    }

  lt_dlinit ();

  loadlibrary = lt_dlloader_find ("lt_loadlibrary");
  if (!loadlibrary)
    {
      /* Skip if the loadlibrary loader isn't supported */
      printf ("loadlibrary loader not found\n");
      err = 77;
      goto cleanup;
    }

  preopen = lt_dlloader_find ("lt_preopen");
  if (!loadlibrary)
    {
      printf ("preopen loader not found\n");
      err = 2;
      goto cleanup;
    }

  /* Remove all loaders except the preopen and loadlibrary loaders. */
  while (next = lt_dlloader_next (loader))
    {
      if (lt_dlloader_get (next) == loadlibrary)
	{
	  loader = next;
	  continue;
	}

      if (lt_dlloader_get (next) == preopen)
	{
	  loader = next;
	  continue;
	}

      lt_dlloader_remove (lt_dlloader_get (next)->name);
    }

  module = lt_dlopen (argv[1]);
  error = lt_dlerror ();

  if (module)
    {
      printf ("lt_dlopen: success!\n");

      if (argc == 2)
	{
	  /* But failure was the desired result... */
	  printf ("expected failure\n");
	  err = 2;
	  goto cleanup;
	}
    }
  else if (argc > 2)
    {
      /* Didn't expect failure... */
      printf ("lt_dlopen: failure: %s\n", error);
      err = 2;
      goto cleanup;
    }
  else if (standard_error_message (error))
    {
      /* Expected custom error message... */
      printf ("lt_dlopen: standard error (bad): %s\n", error);
      err = 1;
      goto cleanup;
    }
  else
    {
      printf ("lt_dlopen: custom error (good): %s\n", error);
      goto cleanup;
    }

  symbol = lt_dlsym (module, argv[2]);
  error = lt_dlerror ();

  if (symbol)
    {
      printf ("lt_dlsym: success!\n");
    }
  else if (standard_error_message (error))
    {
      /* Expected custom failure message... */
      printf ("lt_dlsym: standard error (bad): %s\n", error);
      err = 1;
    }
  else
    {
      printf ("lt_dlsym: custom error (good): %s\n", error);
    }

cleanup:
  if (module)
    {
      lt_dlclose (module);
    }
  lt_dlexit ();
  return err;
}
]])

AT_DATA([foomod.c],
[[
#ifdef __cplusplus
extern "C"
#endif
int foosym (void);
int
foosym (void)
{
  return 0;
}
]])

AT_DATA([bardep.c],
[[
#ifdef __cplusplus
extern "C"
#endif
int bardep (void);
int
bardep (void)
{
  return 0;
}
]])

AT_DATA([barmod.c],
[[
#ifdef __cplusplus
extern "C" {
#endif
int bardep (void);
int barsym (void);
#ifdef __cplusplus
}
#endif
int
barsym (void)
{
  return bardep ();
}
]])

: ${LTDLINCL="-I$abs_top_srcdir/libltdl"}
: ${LIBLTDL="$abs_builddir/../libltdl/libltdlc.la"}

# Skip this test when called from:
#    make distcheck DISTCHECK_CONFIGURE_FLAGS=--disable-ltdl-install
AT_CHECK([case $LIBLTDL in #(
 */_inst/lib/*) test -f "$LIBLTDL" || (exit 77) ;;
esac], [], [ignore])

CPPFLAGS="$LTDLINCL $CPPFLAGS"
inst=`pwd`/inst
libdir=$inst/lib

AT_CHECK([$CC $CPPFLAGS $CFLAGS -c main.c], [], [ignore], [ignore])
for file in foomod.c bardep.c barmod.c; do
  AT_CHECK([$LIBTOOL --mode=compile $CC $CPPFLAGS $CFLAGS -c $file],
	   [], [ignore], [ignore])
done
AT_CHECK([$LIBTOOL --mode=link $CC $CFLAGS $LDFLAGS -o foomod.la ]dnl
	 [-rpath $libdir -module -avoid-version -no-undefined ]dnl
	 [foomod.lo],
	 [], [ignore], [ignore])
AT_CHECK([$LIBTOOL --mode=link $CC $CFLAGS $LDFLAGS -o libbardep.la ]dnl
	 [-rpath $libdir -avoid-version -no-undefined ]dnl
	 [bardep.lo],
	 [], [ignore], [ignore])
AT_CHECK([$LIBTOOL --mode=link $CC $CFLAGS $LDFLAGS -o barmod.la ]dnl
	 [-rpath $libdir -module -avoid-version -no-undefined ]dnl
	 [barmod.lo ./libbardep.la],
	 [], [ignore], [ignore])

AT_CHECK([$LIBTOOL --mode=link $CC $CFLAGS $LDFLAGS -o main$EXEEXT ]dnl
	 [main.$OBJEXT $LIBLTDL],
	 [], [ignore], [ignore])

. ./foomod.la
AT_CHECK([test -n "$dlname" || (exit 77)])

LT_AT_EXEC_CHECK([./main], [], [ignore], [ignore], [./foomod.la no_symbol])

#   chmod -x doesn't appear to work in MSYS, and Wine can load no-exec dlls.
dnl chmod -x $objdir/$dlname
dnl LT_AT_EXEC_CHECK([./main], [], [ignore], [ignore], [./foomod.la])

rm -f $objdir/$dlname
LT_AT_EXEC_CHECK([./main], [], [ignore], [ignore], [./foomod.la])

LT_AT_EXEC_CHECK([./main], [], [ignore], [ignore], [./barmod.la no_symbol])

. ./libbardep.la
#   chmod -x doesn't appear to work in MSYS, and Wine can load no-exec dlls.
dnl chmod -x $objdir/$dlname
dnl LT_AT_EXEC_CHECK([./main], [], [ignore], [ignore], [./barmod.la])

rm -f $objdir/$dlname
LT_AT_EXEC_CHECK([./main], [], [ignore], [ignore], [./barmod.la])

AT_CLEANUP