comparison checker.cpp @ 0:a3c75a438ff7

Initial commit with basic program

+
+/**
+ * Vamp Plugin Load Checker
+ *
+ * This program reads a list of Vamp plugin library paths from stdin,
+ * one per line. For each path read, it attempts to load that library
+ * and retrieve its descriptor function, 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
+ *
+ * Note that 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.
+ */
+
+#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>
+
+using namespace std;
+
+string error()
+{
+    string e = dlerror();
+    if (e == "") return "(unknown error)";
+    else return e;
+}
+
+string check(string soname)
+{
+    void *handle = DLOPEN(soname, RTLD_NOW | RTLD_LOCAL);
+    if (!handle) {
+	return "Unable to open plugin library: " + error();
+    }
+
+    string descriptor = "vampGetPluginDescriptor"; //!!! todo: make an arg
+    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;
+
+    while (getline(cin, soname)) {
+	string report = check(soname);
+	if (report != "") {
+	    cout << "FAILURE|" << soname << "|" << report << endl;
+	    allGood = false;
+	} else {
+	    cout << "SUCCESS|" << soname << "|" << endl;
+	}
+    }
+
+    return allGood ? 0 : 1;
+}