add plibsys

1 files changed, 148 insertions, 0 deletions

diff --git a/3rdparty/plibsys/src/plibraryloader-posix.c b/3rdparty/plibsys/src/plibraryloader-posix.c
new file mode 100644
index 0000000..75ef8ed
--- /dev/null
+++ b/3rdparty/plibsys/src/plibraryloader-posix.c
@@ -0,0 +1,148 @@
+/*
+ * The MIT License
+ *
+ * Copyright (C) 2015-2017 Alexander Saprykin <saprykin.spb@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * 'Software'), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "perror.h"
+#include "pfile.h"
+#include "plibraryloader.h"
+#include "pmem.h"
+#include "pstring.h"
+
+#include <dlfcn.h>
+
+/* FreeBSD may cause a segfault: https://reviews.freebsd.org/D5112,
+ * DragonFlyBSD as well, so we need to check a file size before calling dlopen()
+ */
+#if defined (P_OS_FREEBSD) || defined (P_OS_DRAGONFLY)
+#  include <unistd.h>
+#  include <sys/types.h>
+#  include <sys/stat.h>
+#endif
+
+typedef ppointer plibrary_handle;
+
+struct PLibraryLoader_ {
+	plibrary_handle	handle;
+};
+
+static void pp_library_loader_clean_handle (plibrary_handle handle);
+
+static void
+pp_library_loader_clean_handle (plibrary_handle handle)
+{
+	if (P_UNLIKELY (dlclose (handle) != 0))
+		P_ERROR ("PLibraryLoader::pp_library_loader_clean_handle: dlclose() failed");
+}
+
+P_LIB_API PLibraryLoader *
+p_library_loader_new (const pchar *path)
+{
+	PLibraryLoader	*loader = NULL;
+	plibrary_handle	handle;
+#if defined (P_OS_FREEBSD) || defined (P_OS_DRAGONFLY)
+	struct stat	stat_buf;
+#endif
+
+	if (!p_file_is_exists (path))
+		return NULL;
+
+#if defined (P_OS_FREEBSD) || defined (P_OS_DRAGONFLY)
+	if (P_UNLIKELY (stat (path, &stat_buf) != 0)) {
+		P_ERROR ("PLibraryLoader::p_library_loader_new: stat() failed");
+		return NULL;
+	}
+
+	if (P_UNLIKELY (stat_buf.st_size == 0)) {
+		P_ERROR ("PLibraryLoader::p_library_loader_new: unable to handle zero-size file");
+		return NULL;
+	}
+#endif
+
+	if (P_UNLIKELY ((handle = dlopen (path, RTLD_NOW)) == NULL)) {
+		P_ERROR ("PLibraryLoader::p_library_loader_new: dlopen() failed");
+		return NULL;
+	}
+
+	if (P_UNLIKELY ((loader = p_malloc0 (sizeof (PLibraryLoader))) == NULL)) {
+		P_ERROR ("PLibraryLoader::p_library_loader_new: failed to allocate memory");
+		pp_library_loader_clean_handle (handle);
+		return NULL;
+	}
+
+	loader->handle = handle;
+
+	return loader;
+}
+
+P_LIB_API PFuncAddr
+p_library_loader_get_symbol (PLibraryLoader *loader, const pchar *sym)
+{
+	if (P_UNLIKELY (loader == NULL || sym == NULL || loader->handle == NULL))
+		return NULL;
+
+	return (PFuncAddr) dlsym (loader->handle, sym);
+}
+
+P_LIB_API void
+p_library_loader_free (PLibraryLoader *loader)
+{
+	if (P_UNLIKELY (loader == NULL))
+		return;
+
+	pp_library_loader_clean_handle (loader->handle);
+
+	p_free (loader);
+}
+
+P_LIB_API pchar *
+p_library_loader_get_last_error (PLibraryLoader *loader)
+{
+	pchar *res = NULL;
+	pchar *msg;
+
+	P_UNUSED (loader);
+
+	msg = dlerror ();
+
+	if (msg != NULL)
+		res = p_strdup (msg);
+
+	return res;
+}
+
+P_LIB_API pboolean
+p_library_loader_is_ref_counted (void)
+{
+	return TRUE;
+}
+
+void
+p_library_loader_init (void)
+{
+}
+
+void
+p_library_loader_shutdown (void)
+{
+}