libpxc/.gitignore

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+obj/
+out/
+

libpxc/makefile

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+CC=gcc
+# CFLAGS=-I.
+
+pxct: pxct.c pxc
+	$(CC) -Wall pxct.c -Lout -lpxc -Wl,-rpath=out -o out/pxct
+
+pxc: pxc.c
+	$(CC) -Wall -c -fpic pxc.c -o obj/pxc.o
+	$(CC) -Wall -shared obj/pxc.o -o out/libpxc.so
+

libpxc/pxc.c

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+#include <stdio.h>
+
+int convert(int px[], int *out[]) {
+	printf("convert...\n");
+	return 0;
+}
+
+void __attribute__ ((constructor)) initLibrary(void) {
+ //
+ // Function that is called when the library is loaded
+ //
+    printf("Library is initialized\n"); 
+}
+void __attribute__ ((destructor)) cleanUpLibrary(void) {
+ //
+ // Function that is called when the library is »closed«.
+ //
+    printf("Library is exited\n"); 
+}

libpxc/pxct.c

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+#include <stdio.h>
+
+/* https://www.cprogramming.com/tutorial/shared-libraries-linux-gcc.html
+gcc -Wall -c -fpic pxc.c
+gcc -Wall -shared pxc.o -o pxc.so
+gcc -Wall pxct.c -L. -lpxc -Wl,-rpath=.
+*/
+
+int convert(int px[], int *out[]);
+
+int main() {
+	convert(NULL, NULL);
+	return 0;
+}
+