Hi,

I am sry, but I am new to JNA.

I am trying to make a mapping for posix message queues in C (sys/msg) to Java on my unix pc. but seem to be doing something completely wrong. Maybe anyone can help me with this?

Original C declaration int msgsnd(int msqid, const void *msgp, size_t msgsz,int msgflg); int msgrcv(int msqid, void *msgp, size_t msgsz, long msgtyp,int msgflg); int msgctl(int msqid, int cmd, struct msqid_ds *buf )

My equivalent JNA mapping int msgsnd(int msqid, byte[] msgp, int msgsz, int msgflg); int msgrcv(int msqid, byte[] msgp, int msgsz, NativeLong msgtyp, int msgflg); int msgctl(int msqid, int cmd, Structure buf );

Now I am not sure which library to load. Native.loadLibrary("sys/msg", CLibrary.class) fails with an error.

The library "c" seems to have the function msgsnd, which I tested by Function test = NativeLibrary.getInstance("c").getFunction("msgrcv");

Therefor the library file is loaded by CLibrary INSTANCE = (CLibrary) Native.loadLibrary("c", CLibrary.class);

But trying to receive oder submit messages by int rc = CLibrary.INSTANCE.msgsnd( 0x0a0001c2, "test".getBytes(), 4, IPC_CREAT | 0666);

always results in the return code -1 without any exception or any other failure. is there a way to get further debug information?

thank you very much for any help.

Patrick