Initial Revision

author: Ramiro Polla <ramiro.polla@gmail.com> 2007-06-28 05:50:08 +0000
committer: Ramiro Polla <ramiro.polla@gmail.com> 2007-06-28 05:50:08 +0000
commit: 4c4b268c43f61ec03f07eb883b739135df3f6eb4 (patch)
tree: 9b3433d5e6fb2c62fb25dc8e83d8982f29bfa968
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diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..268a240
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,504 @@
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diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..f98579a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,77 @@
+#
+# dlfcn-win32 Makefile
+#
+include config.mak
+ifeq ($(BUILD_SHARED),yes)
+        TARGETS+=libdl.dll
+        SHFLAGS+=-Wl,--out-implib,libdl.dll.a
+        INSTALL+=shared-install
+endif
+ifeq ($(BUILD_STATIC),yes)
+        TARGETS+=libdl.a
+        INSTALL+=static-install
+endif
+ifeq ($(BUILD_MSVC),yes)
+        SHFLAGS+=-Wl,--output-def,libdl.def
+        LIBCMD=lib
+        INSTALL+=lib-install
+else
+        LIBCMD=echo ignoring lib
+endif
+ifeq ($(DO_STRIP),yes)
+        STRIP=strip
+else
+        STRIP=echo ignoring strip
+endif
+all: $(TARGETS)
+dlfcn.o:
+        $(CC) -o dlfcn.o -c dlfcn.c -O3 -fomit-frame-pointer 
+libdl.a: dlfcn.o
+        ar cru libdl.a dlfcn.o
+        ranlib libdl.a
+libdl.dll: dlfcn.o
+        $(CC) $(SHFLAGS) -shared -o libdl.dll dlfcn.o
+        $(LIBCMD) /machine:i386 /def:libdl.def
+shared-install:
+        mkdir -p $(DESTDIR)$(PREFIX)/bin
+        cp libdl.dll $(DESTDIR)$(PREFIX)/bin
+        $(STRIP) $(DESTDIR)$(PREFIX)/bin/libdl.dll
+        mkdir -p $(DESTDIR)$(PREFIX)/lib
+        cp libdl.dll.a $(DESTDIR)$(PREFIX)/lib
+        mkdir -p $(DESTDIR)$(PREFIX)/include
+        cp dlfcn.h $(DESTDIR)$(PREFIX)/include
+static-install:
+        mkdir -p $(DESTDIR)$(PREFIX)/lib
+        cp libdl.a $(DESTDIR)$(PREFIX)/lib
+        mkdir -p $(DESTDIR)$(PREFIX)/include
+        cp dlfcn.h $(DESTDIR)$(PREFIX)/include
+lib-install:
+        mkdir -p $(DESTDIR)$(PREFIX)/lib
+        cp libdl.lib $(DESTDIR)$(PREFIX)/lib
+install: $(INSTALL)
+test.exe:
+        $(CC) -o test.exe test.c -L. -ldl
+testdll.dll:
+        $(CC) -shared -o testdll.dll testdll.c
+test: $(TARGETS) test.exe testdll.dll
+        test.exe
+clean::
+        rm -f dlfcn.o libdl.dll libdl.a libdl.def libdl.dll.a libdl.lib libdl.exp test.exe testdll.dll
+distclean: clean
+        rm -f config.mak
+.PHONY: clean distclean install test
diff --git a/README b/README
new file mode 100644
index 0000000..192480d
--- /dev/null
+++ b/README
@@ -0,0 +1,11 @@
+dlfcn-win32 is an implementation of dlfcn for Windows.
+It follows the standard as described here:
+http://www.opengroup.org/onlinepubs/009695399/basedefs/dlfcn.h.html
+http://www.opengroup.org/onlinepubs/009695399/functions/dlerror.html
+http://www.opengroup.org/onlinepubs/009695399/functions/dlsym.html
+http://www.opengroup.org/onlinepubs/009695399/functions/dlclose.html
+http://www.opengroup.org/onlinepubs/009695399/functions/dlopen.html
+Written by Ramiro Polla
+Released under the LGPL
+\ No newline at end of file
diff --git a/configure b/configure
new file mode 100755
index 0000000..f5d8c64
--- /dev/null
+++ b/configure
@@ -0,0 +1,151 @@
+#!/bin/sh
+# dlfcn-win32 configure script
+#
+# Parts copied from FFmpeg's configure
+#
+set_all(){
+    value=$1
+    shift
+    for var in $*; do
+        eval $var=$value
+    done
+}
+enable(){
+    set_all yes $*
+}
+disable(){
+    set_all no $*
+}
+enabled(){
+    eval test "x\$$1" = "xyes"
+}
+disabled(){
+    eval test "x\$$1" = "xno"
+}
+show_help(){
+  echo "Usage: configure [options]"
+  echo "Options: [defaults in brackets after descriptions]"
+  echo "All \"enable\" options have \"disable\" counterparts"
+  echo
+  echo "  --help                    print this message"
+  echo "  --prefix=PREFIX           install in PREFIX [$PREFIX]"
+  echo "  --enable-shared           build shared libraries [no]"
+  echo "  --enable-static           build static libraries [yes]"
+  echo "  --enable-msvc             create msvc-compatible import lib [auto]"
+  echo "  --enable-strip            strip shared library [yes]"
+  echo
+  echo "  --cc=CC                   use C compiler CC [$cc]"
+  echo "  --make=MAKE               use specified make [$make]"
+  exit 1
+}
+die_unknown(){
+    echo "Unknown option \"$1\"."
+    echo "See $0 --help for available options."
+    exit 1
+}
+PREFIX="/mingw"
+cc="gcc"
+DEFAULT="msvc
+"
+DEFAULT_NO="shared
+"
+DEFAULT_YES="static
+    strip
+"
+CMDLINE_SELECT="$DEFAULT
+    $DEFAULT_NO
+    $DEFAULT_YES
+"
+enable  $DEFAULT_YES
+disable $DEFAULT_NO
+for opt do
+    optval="${opt#*=}"
+    case "$opt" in
+    --help)
+        show_help
+    ;;
+    --prefix=*)
+        PREFIX="$optval"
+    ;;
+    --cc=*)
+        cc="$optval"
+    ;;
+    --make=*)
+        make="$optval"
+    ;;
+    --enable-?*|--disable-?*)
+        eval `echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g'`
+        echo "$CMDLINE_SELECT" | grep -q "^ *$option\$" || die_unknown $opt
+        $action $option
+    ;;
+    *)
+        die_unknown $opt
+    ;;
+    esac
+done
+disabled shared && disabled static && {
+    echo "At least one library type must be set.";
+    exit 1;
+}
+# simple cc test
+cat > /tmp/test.c << EOF
+int function(void)
+{ return 0; }
+EOF
+$cc -shared -o /tmp/test.dll /tmp/test.c
+test "$?" = !0 && {
+    echo "$cc could not create shared file.";
+    echo "Make sure your system is working properly.";
+    exit 1;
+}
+if enabled msvc; then
+    disabled shared && {
+        echo "MSVC understands static libraries created by gcc."
+        echo "There's no need to create an import lib."
+        exit 1
+    }
+    lib /? >& /dev/null || {
+        echo "MSVC's lib command not found."
+        echo "Make sure MSVC is installed and its bin folder is in your \$PATH."
+        exit 1
+    }
+fi
+if enabled shared; then
+    lib /? >& /dev/null && enable msvc || disable msvc
+fi
+echo "# Automatically generated by configure" > config.mak
+echo "PREFIX=$PREFIX" >> config.mak
+echo "CC=$cc" >> config.mak
+echo "BUILD_SHARED=$shared" >> config.mak
+echo "BUILD_STATIC=$static" >> config.mak
+echo "BUILD_MSVC=$msvc" >> config.mak
+echo "DO_STRIP=$strip" >> config.mak
+echo "prefix: $PREFIX"
+echo "cc:     $cc"
+echo "static: $static"
+echo "shared: $shared"
+enabled shared && {
+    echo "msvc:   $msvc";
+    echo "strip:  $strip";
+}
diff --git a/dlfcn.c b/dlfcn.c
new file mode 100644
index 0000000..f56a262
--- /dev/null
+++ b/dlfcn.c
@@ -0,0 +1,260 @@
+/*
+ * dlfcn-win32
+ * Copyright (c) 2007 Ramiro Polla
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <windows.h>
+#include <stdio.h>
+#include "dlfcn.h"
+/* Note:
+ * MSDN says these functions are not thread-safe. We make no efforts to have
+ * any kind of thread safety.
+ */
+/* I have no special reason to have set MAX_GLOBAL_OBJECTS to this value. Any
+ * comments are welcome.
+ */
+#define MAX_OBJECTS 255
+static HMODULE global_objects[MAX_OBJECTS];
+/* This function adds an object to the list of global objects.
+ * The implementation is very simple and slow.
+ * TODO: should failing this function be enough to fail the call to dlopen( )?
+ */
+static void global_object_add( HMODULE hModule )
+{
+    int i;
+    for( i = 0 ; i < MAX_OBJECTS ; i++ )
+    {
+        if( !global_objects[i] )
+        {
+            global_objects[i] = hModule;
+            break;
+        }
+    }
+}
+static void global_object_rem( HMODULE hModule )
+{
+    int i;
+    for( i = 0 ; i < MAX_OBJECTS ; i++ )
+    {
+        if( global_objects[i] == hModule )
+        {
+            global_objects[i] = 0;
+            break;
+        }
+    }
+}
+/* Argument to last function. Used in dlerror( ) */
+static char last_name[MAX_PATH];
+static int copy_string( char *dest, int dest_size, const char *src )
+{
+    int i = 0;
+    if( src && dest )
+    {
+        for( i = 0 ; i < dest_size-1 ; i++ )
+        {
+            if( !src[i] )
+                break;
+            else
+                dest[i] = src[i];
+        }
+    }
+    dest[i] = '\0';
+    return i;
+}
+void *dlopen( const char *file, int mode )
+{
+    HMODULE hModule;
+    UINT uMode;
+    /* Do not let Windows display the critical-error-handler message box */
+    uMode = SetErrorMode( SEM_FAILCRITICALERRORS );
+    if( file == 0 )
+    {
+        /* Save NULL pointer for error message */
+        sprintf( last_name, "0x%p", file );
+        /* POSIX says that if the value of file is 0, a handle on a global
+         * symbol object must be provided. That object must be able to access
+         * all symbols from the original program file, and any objects loaded
+         * with the RTLD_GLOBAL flag.
+         * The return value from GetModuleHandle( ) allows us to retrieve
+         * symbols only from the original program file. For objects loaded with
+         * the RTLD_GLOBAL flag, we create our own list later on.
+         */
+        hModule = GetModuleHandle( NULL );
+    }
+    else
+    {
+        char lpFileName[MAX_PATH];
+        int i;
+        /* MSDN says backslashes *must* be used instead of forward slashes. */
+        for( i = 0 ; i < sizeof(lpFileName)-1 ; i++ )
+        {
+            if( !file[i] )
+                break;
+            else if( file[i] == '/' )
+                lpFileName[i] = '\\';
+            else
+                lpFileName[i] = file[i];
+        }
+        lpFileName[i] = '\0';
+        /* Save file name for error message */
+        copy_string( last_name, sizeof(last_name), lpFileName );
+        /* POSIX says the search path is implementation-defined.
+         * LOAD_WITH_ALTERED_SEARCH_PATH is used to make it behave more closely
+         * to UNIX's search paths (start with system folders instead of current
+         * folder).
+         */
+        hModule = LoadLibraryEx( (LPSTR) lpFileName, NULL, 
+                                 LOAD_WITH_ALTERED_SEARCH_PATH );
+        /* If the object was loaded with RTLD_GLOBAL, add it to list of global
+         * objects, so that its symbols may be retrieved even if the handle for
+         * the original program file is passed. POSIX says that if the same
+         * file is specified in multiple invocations, and any of them are
+         * RTLD_GLOBAL, even if any further invocations use RTLD_LOCAL, the
+         * symbols will remain global.
+         */
+        if( hModule && (mode & RTLD_GLOBAL) )
+            global_object_add( hModule );
+    }
+    /* Return to previous state of the error-mode bit flags. */
+    SetErrorMode( uMode );
+    return (void *) hModule;
+}
+int dlclose( void *handle )
+{
+    HMODULE hModule = (HMODULE) handle;
+    BOOL ret;
+    /* Save handle for error message */
+    sprintf( last_name, "0x%p", handle );
+    ret = FreeLibrary( hModule );
+    /* If the object was loaded with RTLD_GLOBAL, remove it from list of global
+     * objects.
+     */
+    if( ret )
+        global_object_rem( hModule );
+    /* dlclose's return value in inverted in relation to FreeLibrary's. */
+    ret = !ret;
+    return (int) ret;
+}
+void *dlsym( void *handle, const char *name )
+{
+    FARPROC symbol;
+    /* Save symbol name for error message */
+    copy_string( last_name, sizeof(last_name), name );
+    symbol = GetProcAddress( handle, name );
+    if( symbol == NULL )
+    {
+        HMODULE hModule;
+        /* If the handle for the original program file is passed, also search
+         * in all globally loaded objects.
+         */
+        hModule = GetModuleHandle( NULL );
+        if( hModule == handle )
+        {
+            int i;
+            
+            for( i = 0 ; i < MAX_OBJECTS ; i++ )
+            {
+                if( global_objects[i] != 0 )
+                {
+                    symbol = GetProcAddress( global_objects[i], name );
+                    if( symbol != NULL )
+                        break;
+                }
+            }
+        }
+        CloseHandle( hModule );
+    }
+    return (void*) symbol;
+}
+char *dlerror( void )
+{
+    DWORD dwMessageId;
+    /* POSIX says this function doesn't have to be thread-safe, so we use one
+     * static buffer.
+     * MSDN says the buffer cannot be larger than 64K bytes, so we set it to
+     * the limit.
+     */
+    static char lpBuffer[65535];
+    DWORD ret;
+    dwMessageId = GetLastError( );
+    
+    if( dwMessageId == 0 )
+        return NULL;
+    /* Format error message to:
+     * "<argument to function that failed>": <Windows localized error message>
+     */
+    ret  = copy_string( lpBuffer, sizeof(lpBuffer), "\"" );
+    ret += copy_string( lpBuffer+ret, sizeof(lpBuffer)-ret, last_name );
+    ret += copy_string( lpBuffer+ret, sizeof(lpBuffer)-ret, "\": " );
+    ret += FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM, NULL, dwMessageId,
+                          MAKELANGID( LANG_NEUTRAL, SUBLANG_DEFAULT ),
+                          lpBuffer+ret, sizeof(lpBuffer)-ret, NULL );
+    if( ret > 1 )
+    {
+        /* POSIX says the string must not have trailing <newline> */
+        if( lpBuffer[ret-2] == '\r' && lpBuffer[ret-1] == '\n' )
+            lpBuffer[ret-2] = '\0';
+    }
+    /* POSIX says that invoking dlerror( ) a second time, immediately following
+     * a prior invocation, shall result in NULL being returned.
+     */
+    SetLastError(0);
+    return lpBuffer;
+}
diff --git a/dlfcn.h b/dlfcn.h
new file mode 100644
index 0000000..dfc2551
--- /dev/null
+++ b/dlfcn.h
@@ -0,0 +1,45 @@
+/*
+ * dlfcn-win32
+ * Copyright (c) 2007 Ramiro Polla
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#ifndef DLFCN_H
+#define DLFCN_H
+/* POSIX says these are implementation-defined.
+ * To simplify use with Windows API, we treat them the same way.
+ */
+#define RTLD_LAZY   0
+#define RTLD_NOW    0
+#define RTLD_GLOBAL (1 << 1)
+#define RTLD_LOCAL  (1 << 2)
+/* These two were added in The Open Group Base Specifications Issue 6.
+ * Note: All other RTLD_* flags in any dlfcn.h are not standard compliant.
+ */
+#define RTLD_DEFAULT    0
+#define RTLD_NEXT       0
+void *dlopen ( const char *file, int mode );
+int   dlclose( void *handle );
+void *dlsym  ( void *handle, const char *name );
+char *dlerror( void );
+#endif /* DLFCN_H */
diff --git a/test.c b/test.c
new file mode 100644
index 0000000..832c000
--- /dev/null
+++ b/test.c
@@ -0,0 +1,157 @@
+/*
+ * dlfcn-win32
+ * Copyright (c) 2007 Ramiro Polla
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <stdio.h>
+#include "dlfcn.h"
+/* This is what this test does:
+ * - Open library with RTLD_GLOBAL
+ * - Get global object
+ * - Get symbol from library through library object <- works
+ * - Run function if it worked
+ * - Get symbol from library through global object  <- works
+ * - Run function if it worked
+ * - Close library
+ * - Open library with RTLD_LOCAL
+ * - Get symbol from library through library object <- works
+ * - Run function if it worked
+ * - Get symbol from library through global object  <- fails
+ * - Run function if it worked
+ * - Open library again (without closing it first) with RTLD_GLOBAL
+ * - Get symbol from library through global object  <- works
+ * - Close library
+ * - Close global object
+ */
+int main()
+{
+    void *global;
+    void *library;
+    char *error;
+    int (*function)( void );
+    int ret;
+    
+    library = dlopen( "testdll.dll", RTLD_GLOBAL );
+    if( !library )
+    {
+        error = dlerror( );
+        printf( "Could not open library globally: %s\n", error ? error : "" );
+    }
+    else
+        printf( "Opened library globally: %p\n", library );
+    
+    global = dlopen( 0, RTLD_GLOBAL );
+    if( !global )
+    {
+        error = dlerror( );
+        printf( "Could not open global handle: %s\n", error ? error : "" );
+    }
+    else
+        printf( "Got global handle: %p\n", global );
+    
+    function = dlsym( library, "function" );
+    if( !function )
+    {
+        error = dlerror( );
+        printf( "Could not get symbol from library handle: %s\n",
+                error ? error : "" );
+    }
+    else
+        printf( "Got symbol from library handle: %p\n", function );
+    if( function )
+        function( );
+    function = dlsym( global, "function" );
+    if( !function )
+    {
+        error = dlerror( );
+        printf( "Could not get symbol from global handle: %s\n",
+                error ? error : "" );
+    }
+    else
+        printf( "Got symbol from global handle: %p\n", function );
+    
+    if( function )
+        function( );
+    ret = dlclose( library );
+    if( ret )
+    {
+        error = dlerror( );
+        printf( "Could not close library: %s\n", error ? error : "" );
+    }
+    else
+        printf( "Closed library.\n" );
+        
+    library = dlopen( "testdll.dll", RTLD_LOCAL );
+    if( !library )
+    {
+        error = dlerror( );
+        printf( "Could not open library locally: %s\n", error ? error : "" );
+    }
+    else
+        printf( "Opened library locally: %p\n", library );
+    function = dlsym( library, "function" );
+    if( !function )
+    {
+        error = dlerror( );
+        printf( "Could not get symbol from library handle: %s\n",
+                error ? error : "" );
+    }
+    else
+        printf( "Got symbol from library handle: %p\n", function );
+    if( function )
+        function( );
+    function = dlsym( global, "function" );
+    if( !function )
+    {
+        error = dlerror( );
+        printf( "Could not get symbol from global handle: %s\n",
+                error ? error : "" );
+    }
+    else
+        printf( "Got symbol from global handle: %p\n", function );
+    if( function )
+        function( );
+    ret = dlclose( library );
+    if( ret )
+    {
+        error = dlerror( );
+        printf( "Could not close library: %s\n", error ? error : "" );
+    }
+    else
+        printf( "Closed library.\n" );
+    ret = dlclose( global );
+    if( ret )
+    {
+        error = dlerror( );
+        printf( "Could not close global handle: %s\n", error ? error : "" );
+    }
+    else
+        printf( "Closed global handle.\n" );
+    return 0;
+}
diff --git a/testdll.c b/testdll.c
new file mode 100644
index 0000000..851dc59
--- /dev/null
+++ b/testdll.c
@@ -0,0 +1,26 @@
+/*
+ * dlfcn-win32
+ * Copyright (c) 2007 Ramiro Polla
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <stdio.h>
+int function( void )
+{
+    printf( "Hello, world!\n" );
+    return 0;
+}
author	Ramiro Polla <ramiro.polla@gmail.com>	2007-06-28 05:50:08 +0000
committer	Ramiro Polla <ramiro.polla@gmail.com>	2007-06-28 05:50:08 +0000
commit	4c4b268c43f61ec03f07eb883b739135df3f6eb4 (patch)
tree	9b3433d5e6fb2c62fb25dc8e83d8982f29bfa968
download	dlfcn-win32-4c4b268c43f61ec03f07eb883b739135df3f6eb4.tar.gz dlfcn-win32-4c4b268c43f61ec03f07eb883b739135df3f6eb4.tar.bz2 dlfcn-win32-4c4b268c43f61ec03f07eb883b739135df3f6eb4.zip