[Libguestfs] [PATCH nbdkit 1/3] include: Function indirection for PE DLL
Richard W.M. Jones
rjones at redhat.com
Mon Mar 23 12:28:10 UTC 2020
From: Yifan Gu <gyf304 at gmail.com>
This patch adds in indirection for API functions, as PE DLL loader
does not resolve undefined symbols.
This patch only includes header changes.
---
include/nbdkit-common.h | 133 +++++++++++++++++++++++++++++++++++++++-
include/nbdkit-compat.h | 97 +++++++++++++++++++++++++++++
include/nbdkit-filter.h | 39 ++++++++++++
include/nbdkit-plugin.h | 27 ++++++++
include/Makefile.am | 1 +
5 files changed, 295 insertions(+), 2 deletions(-)
diff --git a/include/nbdkit-common.h b/include/nbdkit-common.h
index 9d1d89d0..57abc423 100644
--- a/include/nbdkit-common.h
+++ b/include/nbdkit-common.h
@@ -40,10 +40,14 @@
#include <stdarg.h>
#include <stdint.h>
#include <errno.h>
-#include <sys/socket.h>
+#include <nbdkit-compat.h>
#include <nbdkit-version.h>
+#if defined(NBDKIT_INTERNAL) || !defined(WINDOWS_COMPAT)
+#include <sys/socket.h>
+#endif
+
#ifdef __cplusplus
extern "C" {
#endif
@@ -76,6 +80,7 @@ extern "C" {
#define NBDKIT_EXTENT_HOLE (1<<0) /* Same as NBD_STATE_HOLE */
#define NBDKIT_EXTENT_ZERO (1<<1) /* Same as NBD_STATE_ZERO */
+#if defined(NBDKIT_INTERNAL) || !defined(WINDOWS_COMPAT)
extern void nbdkit_error (const char *msg, ...) ATTRIBUTE_FORMAT_PRINTF (1, 2);
extern void nbdkit_verror (const char *msg, va_list args)
ATTRIBUTE_FORMAT_PRINTF (1, 0);
@@ -113,9 +118,133 @@ extern const char *nbdkit_export_name (void);
extern int nbdkit_peer_name (struct sockaddr *addr, socklen_t *addrlen);
extern void nbdkit_shutdown (void);
-struct nbdkit_extents;
extern int nbdkit_add_extent (struct nbdkit_extents *,
uint64_t offset, uint64_t length, uint32_t type);
+#else
+static void nbdkit_error (const char *msg, ...)
+ ATTRIBUTE_FORMAT_PRINTF (1, 2);
+static void nbdkit_error (const char *msg, ...)
+{
+ va_list args;
+ va_start(args, msg);
+ _nbdkit_functions.verror(msg, args);
+ va_end(args);
+}
+static void nbdkit_verror (const char *msg, va_list args)
+ ATTRIBUTE_FORMAT_PRINTF (1, 0);
+static void nbdkit_verror (const char *msg, va_list args)
+{
+ _nbdkit_functions.verror (msg, args);
+}
+static void nbdkit_debug (const char *msg, ...)
+ ATTRIBUTE_FORMAT_PRINTF (1, 2);
+static void nbdkit_debug (const char *msg, ...)
+{
+ va_list args;
+ va_start (args, msg);
+ _nbdkit_functions.vdebug (msg, args);
+ va_end (args);
+}
+static void nbdkit_vdebug (const char *msg, va_list args)
+ ATTRIBUTE_FORMAT_PRINTF (1, 0);
+static void nbdkit_vdebug (const char *msg, va_list args)
+{
+ _nbdkit_functions.vdebug (msg, args);
+}
+
+static char *nbdkit_absolute_path (const char *path)
+{
+ return _nbdkit_functions.absolute_path (path);
+}
+static int64_t nbdkit_parse_size (const char *str)
+{
+ return _nbdkit_functions.parse_size (str);
+}
+static int nbdkit_parse_bool (const char *str)
+{
+ return _nbdkit_functions.parse_bool (str);
+}
+static int nbdkit_parse_int (const char *what, const char *str,
+ int *r)
+{
+ return _nbdkit_functions.parse_int (what, str, r);
+}
+static int nbdkit_parse_unsigned (const char *what, const char *str,
+ unsigned *r)
+{
+ return _nbdkit_functions.parse_unsigned (what, str, r);
+}
+static int nbdkit_parse_int8_t (const char *what, const char *str,
+ int8_t *r)
+{
+ return _nbdkit_functions.parse_int8_t (what, str, r);
+}
+static int nbdkit_parse_uint8_t (const char *what, const char *str,
+ uint8_t *r)
+{
+ return _nbdkit_functions.parse_uint8_t (what, str, r);
+}
+static int nbdkit_parse_int16_t (const char *what, const char *str,
+ int16_t *r)
+{
+ return _nbdkit_functions.parse_int16_t (what, str, r);
+}
+static int nbdkit_parse_uint16_t (const char *what, const char *str,
+ uint16_t *r)
+{
+ return _nbdkit_functions.parse_uint16_t (what, str, r);
+}
+static int nbdkit_parse_int32_t (const char *what, const char *str,
+ int32_t *r)
+{
+ return _nbdkit_functions.parse_int32_t (what, str, r);
+}
+static int nbdkit_parse_uint32_t (const char *what, const char *str,
+ uint32_t *r)
+{
+ return _nbdkit_functions.parse_uint32_t (what, str, r);
+}
+static int nbdkit_parse_int64_t (const char *what, const char *str,
+ int64_t *r)
+{
+ return _nbdkit_functions.parse_int64_t (what, str, r);
+}
+static int nbdkit_parse_uint64_t (const char *what, const char *str,
+ uint64_t *r)
+{
+ return _nbdkit_functions.parse_uint64_t(what, str, r);
+}
+static int nbdkit_read_password (const char *value, char **password)
+{
+ return _nbdkit_functions.read_password(value, password);
+}
+static char *nbdkit_realpath (const char *path)
+{
+ return _nbdkit_functions.realpath(path);
+}
+static int nbdkit_nanosleep (unsigned sec, unsigned nsec)
+{
+ return _nbdkit_functions.nanosleep(sec, nsec);
+}
+static const char *nbdkit_export_name (void)
+{
+ return _nbdkit_functions.export_name();
+}
+static int nbdkit_peer_name (void *addr, void *addrlen)
+{
+ return _nbdkit_functions.peer_name(addr, addrlen);
+}
+static void nbdkit_shutdown (void)
+{
+ _nbdkit_functions.shutdown();
+}
+
+static int nbdkit_add_extent (struct nbdkit_extents *extents,
+ uint64_t offset, uint64_t length, uint32_t type)
+{
+ return _nbdkit_functions.add_extent(extents, offset, length, type);
+}
+#endif
/* A static non-NULL pointer which can be used when you don't need a
* per-connection handle.
diff --git a/include/nbdkit-compat.h b/include/nbdkit-compat.h
new file mode 100644
index 00000000..a0a4cb69
--- /dev/null
+++ b/include/nbdkit-compat.h
@@ -0,0 +1,97 @@
+/* nbdkit
+ * Copyright (C) 2013-2020 Red Hat Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of Red Hat nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef NBDKIT_COMPAT_H
+#define NBDKIT_COMPAT_H
+
+#if !defined (NBDKIT_PLUGIN_H) && !defined (NBDKIT_FILTER_H)
+#error this header file should not be directly included
+#endif
+
+#if defined(_WIN32) || defined(__MINGW32__) || defined(__CYGWIN__) || \
+ defined(_MSC_VER)
+#define WINDOWS_COMPAT
+#endif
+
+struct nbdkit_extents;
+
+#if defined(WINDOWS_COMPAT)
+#include <string.h>
+#include <stdarg.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef WINDOWS_COMPAT
+struct nbdkit_functions {
+ void (*verror) (const char *msg, va_list args);
+ void (*vdebug) (const char *msg, va_list args);
+ char * (*absolute_path) (const char *path);
+ int64_t (*parse_size) (const char *str);
+ int (*parse_bool) (const char *str);
+ int (*parse_int) (const char *what, const char *str, int *r);
+ int (*parse_unsigned) (const char *what, const char *str, unsigned *r);
+ int (*parse_int8_t) (const char *what, const char *str, int8_t *r);
+ int (*parse_uint8_t) (const char *what, const char *str, uint8_t *r);
+ int (*parse_int16_t) (const char *what, const char *str, int16_t *r);
+ int (*parse_uint16_t) (const char *what, const char *str, uint16_t *r);
+ int (*parse_int32_t) (const char *what, const char *str, int32_t *r);
+ int (*parse_uint32_t) (const char *what, const char *str, uint32_t *r);
+ int (*parse_int64_t) (const char *what, const char *str, int64_t *r);
+ int (*parse_uint64_t) (const char *what, const char *str, uint64_t *r);
+ int (*read_password) (const char *value, char **password);
+ char * (*realpath) (const char *path);
+ int (*nanosleep) (unsigned sec, unsigned nsec);
+ const char * (*export_name) (void);
+ int (*peer_name) (void *addr, void *addrlen);
+ void (*shutdown) (void);
+
+ struct nbdkit_extents *(*extents_new) (uint64_t start, uint64_t end);
+ void (*extents_free) (struct nbdkit_extents *);
+ size_t (*extents_count) (const struct nbdkit_extents *);
+ struct nbdkit_extent (*get_extent) (const struct nbdkit_extents *, size_t);
+ int (*add_extent) (struct nbdkit_extents *, uint64_t offset, uint64_t length,
+ uint32_t type);
+
+ void (*set_error) (int err);
+};
+
+struct nbdkit_functions _nbdkit_functions;
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+#endif
+#endif
diff --git a/include/nbdkit-filter.h b/include/nbdkit-filter.h
index ca58e496..40ab4345 100644
--- a/include/nbdkit-filter.h
+++ b/include/nbdkit-filter.h
@@ -110,11 +110,31 @@ struct nbdkit_extent {
uint32_t type;
};
+#if defined(NBDKIT_INTERNAL) || !defined(WINDOWS_COMPAT)
extern struct nbdkit_extents *nbdkit_extents_new (uint64_t start, uint64_t end);
extern void nbdkit_extents_free (struct nbdkit_extents *);
extern size_t nbdkit_extents_count (const struct nbdkit_extents *);
extern struct nbdkit_extent nbdkit_get_extent (const struct nbdkit_extents *,
size_t);
+#else
+static struct nbdkit_extents *nbdkit_extents_new (uint64_t start, uint64_t end)
+{
+ return _nbdkit_functions.extents_new(start, end);
+}
+static void nbdkit_extents_free (struct nbdkit_extents *extents)
+{
+ _nbdkit_functions.extents_free(extents);
+}
+static size_t nbdkit_extents_count (const struct nbdkit_extents *extents)
+{
+ return _nbdkit_functions.extents_count(extents);
+}
+static struct nbdkit_extent nbdkit_get_extent (const struct nbdkit_extents *extents,
+ size_t size)
+{
+ return _nbdkit_functions.get_extent(extents, size);
+}
+#endif
/* Filter struct. */
struct nbdkit_filter {
@@ -204,6 +224,24 @@ struct nbdkit_filter {
int *err);
};
+#if defined(WINDOWS_COMPAT)
+#define NBDKIT_REGISTER_FILTER(filter) \
+ NBDKIT_CXX_LANG_C __declspec(dllexport) \
+ struct nbdkit_filter * \
+ filter_init (void) \
+ { \
+ (filter)._api_version = NBDKIT_FILTER_API_VERSION; \
+ (filter)._version = NBDKIT_VERSION_STRING; \
+ return &(filter); \
+ } \
+ NBDKIT_CXX_LANG_C __declspec(dllexport) \
+ void \
+ functions_init (struct nbdkit_functions *functions) \
+ { \
+ memcpy(&_nbdkit_functions, functions, \
+ sizeof(struct nbdkit_functions)); \
+ }
+#else
#define NBDKIT_REGISTER_FILTER(filter) \
NBDKIT_CXX_LANG_C \
struct nbdkit_filter * \
@@ -213,6 +251,7 @@ struct nbdkit_filter {
(filter)._version = NBDKIT_VERSION_STRING; \
return &(filter); \
}
+#endif
#ifdef __cplusplus
}
diff --git a/include/nbdkit-plugin.h b/include/nbdkit-plugin.h
index 7ff7bcee..6b6d99d3 100644
--- a/include/nbdkit-plugin.h
+++ b/include/nbdkit-plugin.h
@@ -140,8 +140,34 @@ struct nbdkit_plugin {
int (*get_ready) (void);
};
+#if defined(NBDKIT_INTERNAL) || !defined(WINDOWS_COMPAT)
extern void nbdkit_set_error (int err);
+#else
+static void nbdkit_set_error (int err)
+{
+ _nbdkit_functions.set_error (err);
+}
+#endif
+#if defined(WINDOWS_COMPAT)
+#define NBDKIT_REGISTER_PLUGIN(plugin) \
+ NBDKIT_CXX_LANG_C __declspec(dllexport) \
+ struct nbdkit_plugin * \
+ plugin_init (void) \
+ { \
+ (plugin)._struct_size = sizeof (plugin); \
+ (plugin)._api_version = NBDKIT_API_VERSION; \
+ (plugin)._thread_model = THREAD_MODEL; \
+ return &(plugin); \
+ } \
+ NBDKIT_CXX_LANG_C __declspec(dllexport) \
+ void \
+ functions_init (struct nbdkit_functions *functions) \
+ { \
+ memcpy(&_nbdkit_functions, functions, \
+ sizeof(struct nbdkit_functions)); \
+ }
+#else
#define NBDKIT_REGISTER_PLUGIN(plugin) \
NBDKIT_CXX_LANG_C \
struct nbdkit_plugin * \
@@ -152,6 +178,7 @@ extern void nbdkit_set_error (int err);
(plugin)._thread_model = THREAD_MODEL; \
return &(plugin); \
}
+#endif
#ifdef __cplusplus
}
diff --git a/include/Makefile.am b/include/Makefile.am
index cf46abc6..8b413570 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -32,6 +32,7 @@
include $(top_srcdir)/common-rules.mk
include_HEADERS = \
+ nbdkit-compat.h \
nbdkit-common.h \
nbdkit-plugin.h \
nbdkit-filter.h \
--
2.25.0
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