binder第二課

binder demoテスト:
test_client.c

/* Copyright 2008 The Android Open Source Project
 */

#include 
#include 
#include 
#include 
#include
#include 

#include 

#include "binder.h"
#include "test_server.h"



uint32_t svcmgr_lookup(struct binder_state *bs, uint32_t target, const char *name)
{
    uint32_t handle;
    unsigned iodata[512/4];
    struct binder_io msg, reply;

    bio_init(&msg, iodata, sizeof(iodata), 4);
    bio_put_uint32(&msg, 0);  // strict mode header
    bio_put_string16_x(&msg, SVC_MGR_NAME);
    bio_put_string16_x(&msg, name);

    if (binder_call(bs, &msg, &reply, target, SVC_MGR_CHECK_SERVICE))
        return 0;

    handle = bio_get_ref(&reply);

    if (handle)
        binder_acquire(bs, handle);

    binder_done(bs, &msg, &reply);

    return handle;
}


struct binder_state *g_bs;
uint32_t g_handle;

void sayhello(void)
{
    unsigned iodata[512/4];
    struct binder_io msg, reply;

	/*  binder_io */
    bio_init(&msg, iodata, sizeof(iodata), 4);
    bio_put_uint32(&msg, 0);  // strict mode header

	/*   */

	/*  binder_call */
    if (binder_call(g_bs, &msg, &reply, g_handle, HELLO_SVR_CMD_SAYHELLO))
		//g_handle： svcmgr_lookup server handle
        return ;
	
	/*  reply  */
	// 
	
	
    binder_done(g_bs, &msg, &reply);// 
	
}

int sayhello_to(char *name)
{
	unsigned iodata[512/4];
	struct binder_io msg, reply;
	int ret;

	/*  binder_io */
	bio_init(&msg, iodata, sizeof(iodata), 4);
	bio_put_uint32(&msg, 0);  // strict mode header

	/*   */
    bio_put_string16_x(&msg, name);// buf 

	/*  binder_call */
	if (binder_call(g_bs, &msg, &reply, g_handle, HELLO_SVR_CMD_SAYHELLO_TO))
		return 0;
	
	/*  reply  */
	ret = bio_get_uint32(&reply);

	binder_done(g_bs, &msg, &reply);

	return ret;
	
}



/* ./test_client hello
 * ./test_client hello 
 */

int main(int argc, char **argv)
{
    int fd;
    struct binder_state *bs;
    uint32_t svcmgr = BINDER_SERVICE_MANAGER;
    uint32_t handle;
	int ret;

	if (argc < 2){
        fprintf(stderr, "Usage:
");
        fprintf(stderr, "%s hello
", argv[0]);
        fprintf(stderr, "%s hello 
", argv[0]);
        return -1;
	}

    bs = binder_open(128*1024);
    if (!bs) {
        fprintf(stderr, "failed to open binder driver
");
        return -1;
    }
	g_bs = bs;

	/* get service */
	handle = svcmgr_lookup(bs, svcmgr, "hello");
	if (!handle) {
        fprintf(stderr, "failed to get hello service
");
        return -1;
	}
	g_handle = handle;

	/* send data to server */
	if (argc == 2) {
		sayhello();
	} else if (argc == 3) {
		ret = sayhello_to(argv[2]);
        fprintf(stderr, "get ret of sayhello_to = %d
", ret);		
	}

	binder_release(bs, handle);

    return 0;
}

binder_server.c

/* Copyright 2008 The Android Open Source Project
 */

#include 
#include 
#include 
#include 
#include
#include 

#include 

#include "binder.h"
#include "test_server.h"

int svcmgr_publish(struct binder_state *bs, uint32_t target, const char *name, void *ptr)
{
    int status;
    unsigned iodata[512/4];
    struct binder_io msg, reply;

    bio_init(&msg, iodata, sizeof(iodata), 4);
    bio_put_uint32(&msg, 0);  // strict mode header
    bio_put_string16_x(&msg, SVC_MGR_NAME);
    bio_put_string16_x(&msg, name);
    bio_put_obj(&msg, ptr);

    if (binder_call(bs, &msg, &reply, target, SVC_MGR_ADD_SERVICE))
        return -1;

    status = bio_get_uint32(&reply);

    binder_done(bs, &msg, &reply);

    return status;
}

void sayhello(void)
{
	static int cnt = 0;
	fprintf(stderr, "say hello : %d
", cnt++);
}


int sayhello_to(char *name)
{
	static int cnt = 0;
	fprintf(stderr, "say hello to %s : %d
", name, cnt++);
	return cnt;
}


int hello_service_handler(struct binder_state *bs,
                   struct binder_transaction_data *txn,
                   struct binder_io *msg,
                   struct binder_io *reply)
{
	/*  txn->code 
	 *  ,  msg 
	 *  ,  reply
	 */

	/* sayhello
	 * sayhello_to
	 */
	
    uint16_t *s;
	char name[512];
    size_t len;
    uint32_t handle;
    uint32_t strict_policy;
	int i;


    // Equivalent to Parcel::enforceInterface(), reading the RPC
    // header with the strict mode policy mask and the interface name.
    // Note that we ignore the strict_policy and don't propagate it
    // further (since we do no outbound RPCs anyway).
    strict_policy = bio_get_uint32(msg);


    switch(txn->code) {
    case HELLO_SVR_CMD_SAYHELLO:
		sayhello();
        return 0;

    case HELLO_SVR_CMD_SAYHELLO_TO:
		/*  msg  */
		s = bio_get_string16(msg, &len);
		if (s == NULL) {
			return -1;
		}
		for (i = 0; i < len; i++)
			name[i] = s[i];
		name[i] = '\0';

		/*   */
		i = sayhello_to(name);

		/*  reply */
		bio_put_uint32(reply, i);
		
        break;

    default:
        fprintf(stderr, "unknown code %d
", txn->code);
        return -1;
    }

    return 0;
}

int main(int argc, char **argv)
{
    int fd;
    struct binder_state *bs;
    uint32_t svcmgr = BINDER_SERVICE_MANAGER;
    uint32_t handle;
	int ret;

    bs = binder_open(128*1024);
    if (!bs) {
        fprintf(stderr, "failed to open binder driver
");
        return -1;
    }

	/* add service */
	ret = svcmgr_publish(bs, svcmgr, "hello", (void *)123);
    if (ret) {
        fprintf(stderr, "failed to publish hello service
");
        return -1;
    }
	ret = svcmgr_publish(bs, svcmgr, "goodbye", (void *)124);
    if (ret) {
        fprintf(stderr, "failed to publish goodbye service
");
    }

#if 0
	while (1)
	{
		/* read data */
		/* parse data, and process */
		/* reply */
	}
#endif
    binder_loop(bs, hello_service_handler);

    return 0;
}