diff src/helper.cpp @ 8:25e00373f597

Much renaming to ease inclusion into another project

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/helper.cpp	Thu Apr 14 16:52:19 2016 +0100
@@ -0,0 +1,130 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/**
+ * Plugin Load Checker Helper
+ *
+ * This program accepts the name of a descriptor symbol as its only
+ * command-line argument. It then reads a list of plugin library paths
+ * from stdin, one per line. For each path read, it attempts to load
+ * that library and retrieve the named descriptor symbol, printing a
+ * line to stdout reporting whether this was successful or not and
+ * then flushing stdout. The output line format is described
+ * below. The program exits with code 0 if all libraries were loaded
+ * successfully and non-zero otherwise.
+ *
+ * Note that library paths must be ready to pass to dlopen() or
+ * equivalent; this usually means they should be absolute paths.
+ *
+ * Output line for successful load of library libname.so:
+ * SUCCESS|/path/to/libname.so|
+ * 
+ * Output line for failed load of library libname.so:
+ * FAILURE|/path/to/libname.so|Reason for failure if available
+ *
+ * Sometimes plugins will crash completely on load, bringing down this
+ * program with them. If the program exits before all listed plugins
+ * have been checked, this means that the plugin following the last
+ * reported one has crashed. Typically the caller may want to run it
+ * again, omitting that plugin.
+ */
+
+/*
+    Copyright (c) 2016 Queen Mary, University of London
+
+    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 AUTHOR 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.
+
+    Except as contained in this notice, the names of the Centre for
+    Digital Music and Queen Mary, University of London shall not be
+    used in advertising or otherwise to promote the sale, use or other
+    dealings in this Software without prior written authorization.
+*/
+
+#ifdef _WIN32
+#include <windows.h>
+#include <process.h>
+#define DLOPEN(a,b)  LoadLibrary((a).toStdWString().c_str())
+#define DLSYM(a,b)   GetProcAddress((HINSTANCE)(a),(b))
+#define DLCLOSE(a)   (!FreeLibrary((HINSTANCE)(a)))
+#define DLERROR()    ""
+#else
+#include <dlfcn.h>
+#define DLOPEN(a,b)  dlopen((a).c_str(),(b))
+#define DLSYM(a,b)   dlsym((a),(b).c_str())
+#define DLCLOSE(a)   dlclose((a))
+#define DLERROR()    dlerror()
+#endif
+
+#include <string>
+#include <iostream>
+
+#include <unistd.h>
+
+using namespace std;
+
+string error()
+{
+    string e = dlerror();
+    if (e == "") return "(unknown error)";
+    else return e;
+}
+
+string check(string soname, string descriptor)
+{
+    void *handle = DLOPEN(soname, RTLD_NOW | RTLD_LOCAL);
+    if (!handle) {
+	return "Unable to open plugin library: " + error();
+    }
+
+    void *fn = DLSYM(handle, descriptor);
+    if (!fn) {
+	return "Failed to find plugin descriptor " + descriptor +
+	    " in library: " + error();
+    }
+
+    return "";
+}
+
+int main(int argc, char **argv)
+{
+    bool allGood = true;
+    string soname;
+
+    if (argc != 2) {
+	cerr << "\nUsage:\n    " << argv[0] << " descriptorname\n"
+	    "\nwhere descriptorname is the name of a plugin descriptor symbol to be sought\n"
+	    "in each library (e.g. vampGetPluginDescriptor for Vamp plugins). The list of\n"
+	    "candidate plugin library filenames is read from stdin.\n" << endl;
+	return 2;
+    }
+
+    string descriptor = argv[1];
+    
+    while (getline(cin, soname)) {
+	string report = check(soname, descriptor);
+	if (report != "") {
+	    cout << "FAILURE|" << soname << "|" << report << endl;
+	    allGood = false;
+	} else {
+	    cout << "SUCCESS|" << soname << "|" << endl;
+	}
+    }
+
+    return allGood ? 0 : 1;
+}