initial commit

1 files changed, 29 insertions, 0 deletions

diff --git a/sayhello.c b/sayhello.c
new file mode 100644
index 0000000..1f132df
--- /dev/null
+++ b/sayhello.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <err.h>
+#include <dlfcn.h>
+
+int main(int argc, const char *argv[]) {
+	int i;
+	if (argc < 2)
+		errx(1, "usage: sayhello PLUGIN...");
+
+	for (i=1; i<argc; i++) {
+		const char *plugin = argv[i];
+		void (*sayhello)(void);
+		void *handle = dlopen(plugin, RTLD_NOW | RTLD_LOCAL);
+
+		if (handle == NULL) {
+			warn("%s", plugin);
+			continue;
+		}
+		dlerror(); /* clear existing error */
+
+		/* get the "sayhello" function from plugin */
+		sayhello = (void (*)(void)) dlsym(handle, "sayhello");
+		sayhello();
+
+		dlclose(handle);
+	}
+
+	return 0;
+}