You'll need to add network access permissions to the manifest for the
Android application that is loading the shared object.
For the second issue, I had noticed that message queues work fine on
the emulator, but fail on target. After a closer examination using
strace, I realized that system call SYS_303 is supported on the
emulator but not on the target. Stick to socket or some other IPC
mechanism.
--Ashu
On Dec 3, 6:10 am, Pankaj Munjal <[EMAIL PROTECTED]> wrote:
> Hello folks,
>
> I have implemented a JNI layer for communication between the Android
> Java Application and Android Native C code.
> However, we are facing issues withIPCin this JNI layer.
>
> I tried the followingIPCapproaches:
>
> 1. Socket in JNI layer: C Sockets to communicate with the underlying C
> based processes.
> I get an error in bind().
>
> Sample code:
>
> fd_recv_es = socket(AF_INET,SOCK_DGRAM,0);
>
> if (0 > fd_recv_es)
>
> {
>
> return (FAILURE);
>
> }
>
> bzero(&es_recv_addr, sizeof(es_recv_addr));
>
> es_recv_addr.sin_family = AF_INET;
>
> es_recv_addr.sin_port = htons(self_port);
>
> es_recv_addr.sin_addr.s_addr = inet_addr(self_ip.str);
>
> memset(&(es_recv_addr.sin_zero), '\0', 8);
>
> if ( -1 == bind( fd_recv_es,(struct sockaddr*)(&es_recv_addr),
> sizeof(struct sockaddr_in))) // Fails here
>
> {
>
> return (FAILURE);
>
> }
>
> 2. Message Q in JNI layer: Linux based message queue to communicate
> with the underlying C based processes.
>
> I get an error in creating the
> message queue.
>
> Sample Code:
>
> struct my_msgbuf buf;
>
> int msqid, i;
>
> key_t key;
>
> if ((key = ftok("/data/IPC/dummy", 'B')) == -1)
>
> {
>
> perror("ftok");
>
> exit(1);
>
> }
>
> if ((msqid = msgget(key, 0644 | IPC_CREAT)) == -1) // Fails
> here
>
> {
>
> perror("msgget");
>
> exit(1);
>
> }
>
> Both these approaches work perfectly fine when I use them in an
> Android C executable,
> and we are getting thisproblemonly when we use them in a JNI DLL.
>
> The linking command for the building JNI DLL is:
> ALIB := $(NDK_BASE)/toolchain/arm-eabi/lib/gcc/arm-eabi/4.2.1/
> libgcc.a
> $(CC) -nostdlib -Wl,-soname,libApp.so -Wl,-shared,-Bsymbolic
> -L$(NDK_BASE)/lib $^ $(LIBS) -o libApp.so -Wl,--no-undefined
> $(ALIB)
>
> Has anyone faced a similar issues withIPC(with C executables) in JNI
> layer?
> Also, are there are some other flags required for building a JNI DLL
> that I've missed out on.
> Any pointers in this direction shall be really helpful.
>
> Thanks,
> Pankaj
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