3

03_day/binder_1/Android.bp

@@ -1,5 +1,5 @@
 cc_defaults {
-    name: "my_flags",
+    name: "my_flags_2",
 
     cflags: [
         "-Wall",
@@ -16,11 +16,20 @@ cc_defaults {
 }
 
 cc_binary {
-    name: "my_server_1",
+    name: "my_server_2",
-    defaults: ["my_flags"],
+    defaults: ["my_flags_2"],
     srcs: [
         "my_server.c",
         "binder.c",
     ],
 }
 
+cc_binary {
+    name: "my_client_2",
+    defaults: ["my_flags_2"],
+    srcs: [
+        "my_client.c",
+        "binder.c",
+    ],
+}
+

03_day/binder_1/my_client.c

@@ -0,0 +1,54 @@
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "binder.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;
+}
+
+int main(int argc, char **argv)
+{
+	struct binder_state *bs;
+	uint32_t svcmgr = BINDER_SERVICE_MANAGER;
+	uint32_t handle;
+    unsigned iodata[512/4];
+    struct binder_io msg, reply;
+
+	bs = binder_open("/dev/binder", 128*1024);
+	if (!bs) {
+		fprintf(stderr, "failed to open binder driver\n");
+		return -1;
+	}
+
+	handle = svcmgr_lookup(bs, svcmgr, argv[argc-1]);
+	fprintf(stderr,"lookup(%s) = %x\n", argv[argc-1], handle);
+
+    bio_init(&msg, iodata, sizeof(iodata), 4);
+
+    binder_call(bs, &msg, &reply, handle, 1);
+	return 0;
+}

03_day/binder_1/my_server.c

@@ -36,6 +36,17 @@ int my_handler(struct binder_state *bs,
                               struct binder_io *reply)
 {
 	printf("my_handler %p %p %p %p\n", bs, txn, msg, reply);
+	switch(txn->code) {
+		case 1:
+			printf("Server : LED_ON, %p\n", (void*)txn->target.ptr);
+			return 0;
+
+		default:
+			printf("unknown code %d\n", txn->code);
+			return -1;
+	}
+
+	bio_put_uint32(reply, 0);
 	return 0;
 }
 
@@ -53,6 +64,7 @@ int main(int argc, char **argv)
 		return -1;
 	}
 
+	printf("Server : &token = %p\n", &token );
 	svcmgr_publish(bs, svcmgr, argv[argc-1], &token);
 	binder_loop(bs, my_handler);
 	return 0;

03_day/binder_2/Android.bp

@@ -0,0 +1,35 @@
+cc_defaults {
+    name: "my_flags_3",
+
+    cflags: [
+        "-Wall",
+        "-Wextra",
+        "-Werror",
+    ],
+    product_variables: {
+        binder32bit: {
+            cflags: ["-DBINDER_IPC_32BIT=1"],
+        },
+    },
+
+    shared_libs: ["liblog"],
+}
+
+cc_binary {
+    name: "my_server_3",
+    defaults: ["my_flags_3"],
+    srcs: [
+        "my_server.c",
+        "binder.c",
+    ],
+}
+
+cc_binary {
+    name: "my_client_3",
+    defaults: ["my_flags_3"],
+    srcs: [
+        "my_client.c",
+        "binder.c",
+    ],
+}
+

03_day/binder_2/bctest.c

@@ -0,0 +1,107 @@
+/* Copyright 2008 The Android Open Source Project
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "binder.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;
+}
+
+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;
+}
+
+unsigned token;
+
+int main(int argc, char **argv)
+{
+    struct binder_state *bs;
+    uint32_t svcmgr = BINDER_SERVICE_MANAGER;
+    uint32_t handle;
+
+    bs = binder_open("/dev/binder", 128*1024);
+    if (!bs) {
+        fprintf(stderr, "failed to open binder driver\n");
+        return -1;
+    }
+
+    argc--;
+    argv++;
+    while (argc > 0) {
+        if (!strcmp(argv[0],"alt")) {
+            handle = svcmgr_lookup(bs, svcmgr, "alt_svc_mgr");
+            if (!handle) {
+                fprintf(stderr,"cannot find alt_svc_mgr\n");
+                return -1;
+            }
+            svcmgr = handle;
+            fprintf(stderr,"svcmgr is via %x\n", handle);
+        } else if (!strcmp(argv[0],"lookup")) {
+            if (argc < 2) {
+                fprintf(stderr,"argument required\n");
+                return -1;
+            }
+            handle = svcmgr_lookup(bs, svcmgr, argv[1]);
+            fprintf(stderr,"lookup(%s) = %x\n", argv[1], handle);
+            argc--;
+            argv++;
+        } else if (!strcmp(argv[0],"publish")) {
+            if (argc < 2) {
+                fprintf(stderr,"argument required\n");
+                return -1;
+            }
+            svcmgr_publish(bs, svcmgr, argv[1], &token);
+            argc--;
+            argv++;
+        } else {
+            fprintf(stderr,"unknown command %s\n", argv[0]);
+            return -1;
+        }
+        argc--;
+        argv++;
+    }
+    return 0;
+}

03_day/binder_2/binder.c

@@ -0,0 +1,656 @@
+/* Copyright 2008 The Android Open Source Project
+ */
+
+#define LOG_TAG "Binder"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include <log/log.h>
+
+#include "binder.h"
+
+#define MAX_BIO_SIZE (1 << 30)
+
+#define TRACE 0
+
+void bio_init_from_txn(struct binder_io *io, struct binder_transaction_data *txn);
+
+#if TRACE
+void hexdump(void *_data, size_t len)
+{
+    unsigned char *data = _data;
+    size_t count;
+
+    for (count = 0; count < len; count++) {
+        if ((count & 15) == 0)
+            fprintf(stderr,"%04zu:", count);
+        fprintf(stderr," %02x %c", *data,
+                (*data < 32) || (*data > 126) ? '.' : *data);
+        data++;
+        if ((count & 15) == 15)
+            fprintf(stderr,"\n");
+    }
+    if ((count & 15) != 0)
+        fprintf(stderr,"\n");
+}
+
+void binder_dump_txn(struct binder_transaction_data *txn)
+{
+    struct flat_binder_object *obj;
+    binder_size_t *offs = (binder_size_t *)(uintptr_t)txn->data.ptr.offsets;
+    size_t count = txn->offsets_size / sizeof(binder_size_t);
+
+    fprintf(stderr,"  target %016"PRIx64"  cookie %016"PRIx64"  code %08x  flags %08x\n",
+            (uint64_t)txn->target.ptr, (uint64_t)txn->cookie, txn->code, txn->flags);
+    fprintf(stderr,"  pid %8d  uid %8d  data %"PRIu64"  offs %"PRIu64"\n",
+            txn->sender_pid, txn->sender_euid, (uint64_t)txn->data_size, (uint64_t)txn->offsets_size);
+    hexdump((void *)(uintptr_t)txn->data.ptr.buffer, txn->data_size);
+    while (count--) {
+        obj = (struct flat_binder_object *) (((char*)(uintptr_t)txn->data.ptr.buffer) + *offs++);
+        fprintf(stderr,"  - type %08x  flags %08x  ptr %016"PRIx64"  cookie %016"PRIx64"\n",
+                obj->type, obj->flags, (uint64_t)obj->binder, (uint64_t)obj->cookie);
+    }
+}
+
+#define NAME(n) case n: return #n
+const char *cmd_name(uint32_t cmd)
+{
+    switch(cmd) {
+        NAME(BR_NOOP);
+        NAME(BR_TRANSACTION_COMPLETE);
+        NAME(BR_INCREFS);
+        NAME(BR_ACQUIRE);
+        NAME(BR_RELEASE);
+        NAME(BR_DECREFS);
+        NAME(BR_TRANSACTION);
+        NAME(BR_REPLY);
+        NAME(BR_FAILED_REPLY);
+        NAME(BR_DEAD_REPLY);
+        NAME(BR_DEAD_BINDER);
+    default: return "???";
+    }
+}
+#else
+#define hexdump(a,b) do{} while (0)
+#define binder_dump_txn(txn)  do{} while (0)
+#endif
+
+#define BIO_F_SHARED    0x01  /* needs to be buffer freed */
+#define BIO_F_OVERFLOW  0x02  /* ran out of space */
+#define BIO_F_IOERROR   0x04
+#define BIO_F_MALLOCED  0x08  /* needs to be free()'d */
+
+struct binder_state
+{
+    int fd;
+    void *mapped;
+    size_t mapsize;
+};
+
+struct binder_state *binder_open(const char* driver, size_t mapsize)
+{
+    struct binder_state *bs;
+    struct binder_version vers;
+
+    bs = malloc(sizeof(*bs));
+    if (!bs) {
+        errno = ENOMEM;
+        return NULL;
+    }
+
+    bs->fd = open(driver, O_RDWR | O_CLOEXEC);
+    if (bs->fd < 0) {
+        fprintf(stderr,"binder: cannot open %s (%s)\n",
+                driver, strerror(errno));
+        goto fail_open;
+    }
+
+    if ((ioctl(bs->fd, BINDER_VERSION, &vers) == -1) ||
+        (vers.protocol_version != BINDER_CURRENT_PROTOCOL_VERSION)) {
+        fprintf(stderr,
+                "binder: kernel driver version (%d) differs from user space version (%d)\n",
+                vers.protocol_version, BINDER_CURRENT_PROTOCOL_VERSION);
+        goto fail_open;
+    }
+
+    bs->mapsize = mapsize;
+    bs->mapped = mmap(NULL, mapsize, PROT_READ, MAP_PRIVATE, bs->fd, 0);
+    if (bs->mapped == MAP_FAILED) {
+        fprintf(stderr,"binder: cannot map device (%s)\n",
+                strerror(errno));
+        goto fail_map;
+    }
+
+    return bs;
+
+fail_map:
+    close(bs->fd);
+fail_open:
+    free(bs);
+    return NULL;
+}
+
+void binder_close(struct binder_state *bs)
+{
+    munmap(bs->mapped, bs->mapsize);
+    close(bs->fd);
+    free(bs);
+}
+
+int binder_become_context_manager(struct binder_state *bs)
+{
+    return ioctl(bs->fd, BINDER_SET_CONTEXT_MGR, 0);
+}
+
+int binder_write(struct binder_state *bs, void *data, size_t len)
+{
+    struct binder_write_read bwr;
+    int res;
+
+    bwr.write_size = len;
+    bwr.write_consumed = 0;
+    bwr.write_buffer = (uintptr_t) data;
+    bwr.read_size = 0;
+    bwr.read_consumed = 0;
+    bwr.read_buffer = 0;
+    res = ioctl(bs->fd, BINDER_WRITE_READ, &bwr);
+    if (res < 0) {
+        fprintf(stderr,"binder_write: ioctl failed (%s)\n",
+                strerror(errno));
+    }
+    return res;
+}
+
+void binder_free_buffer(struct binder_state *bs,
+                        binder_uintptr_t buffer_to_free)
+{
+    struct {
+        uint32_t cmd_free;
+        binder_uintptr_t buffer;
+    } __attribute__((packed)) data;
+    data.cmd_free = BC_FREE_BUFFER;
+    data.buffer = buffer_to_free;
+    binder_write(bs, &data, sizeof(data));
+}
+
+void binder_send_reply(struct binder_state *bs,
+                       struct binder_io *reply,
+                       binder_uintptr_t buffer_to_free,
+                       int status)
+{
+    struct {
+        uint32_t cmd_free;
+        binder_uintptr_t buffer;
+        uint32_t cmd_reply;
+        struct binder_transaction_data txn;
+    } __attribute__((packed)) data;
+
+    data.cmd_free = BC_FREE_BUFFER;
+    data.buffer = buffer_to_free;
+    data.cmd_reply = BC_REPLY;
+    data.txn.target.ptr = 0;
+    data.txn.cookie = 0;
+    data.txn.code = 0;
+    if (status) {
+        data.txn.flags = TF_STATUS_CODE;
+        data.txn.data_size = sizeof(int);
+        data.txn.offsets_size = 0;
+        data.txn.data.ptr.buffer = (uintptr_t)&status;
+        data.txn.data.ptr.offsets = 0;
+    } else {
+        data.txn.flags = 0;
+        data.txn.data_size = reply->data - reply->data0;
+        data.txn.offsets_size = ((char*) reply->offs) - ((char*) reply->offs0);
+        data.txn.data.ptr.buffer = (uintptr_t)reply->data0;
+        data.txn.data.ptr.offsets = (uintptr_t)reply->offs0;
+    }
+    binder_write(bs, &data, sizeof(data));
+}
+
+int binder_parse(struct binder_state *bs, struct binder_io *bio,
+                 uintptr_t ptr, size_t size, binder_handler func)
+{
+    int r = 1;
+    uintptr_t end = ptr + (uintptr_t) size;
+
+    while (ptr < end) {
+        uint32_t cmd = *(uint32_t *) ptr;
+        ptr += sizeof(uint32_t);
+#if TRACE
+        fprintf(stderr,"%s:\n", cmd_name(cmd));
+#endif
+        switch(cmd) {
+        case BR_NOOP:
+            break;
+        case BR_TRANSACTION_COMPLETE:
+            break;
+        case BR_INCREFS:
+        case BR_ACQUIRE:
+        case BR_RELEASE:
+        case BR_DECREFS:
+#if TRACE
+            fprintf(stderr,"  %p, %p\n", (void *)ptr, (void *)(ptr + sizeof(void *)));
+#endif
+            ptr += sizeof(struct binder_ptr_cookie);
+            break;
+        case BR_TRANSACTION: {
+            struct binder_transaction_data *txn = (struct binder_transaction_data *) ptr;
+            if ((end - ptr) < sizeof(*txn)) {
+                ALOGE("parse: txn too small!\n");
+                return -1;
+            }
+            binder_dump_txn(txn);
+            if (func) {
+                unsigned rdata[256/4];
+                struct binder_io msg;
+                struct binder_io reply;
+                int res;
+
+                bio_init(&reply, rdata, sizeof(rdata), 4);
+                bio_init_from_txn(&msg, txn);
+                res = func(bs, txn, &msg, &reply);
+                if (txn->flags & TF_ONE_WAY) {
+                    binder_free_buffer(bs, txn->data.ptr.buffer);
+                } else {
+                    binder_send_reply(bs, &reply, txn->data.ptr.buffer, res);
+                }
+            }
+            ptr += sizeof(*txn);
+            break;
+        }
+        case BR_REPLY: {
+            struct binder_transaction_data *txn = (struct binder_transaction_data *) ptr;
+            if ((end - ptr) < sizeof(*txn)) {
+                ALOGE("parse: reply too small!\n");
+                return -1;
+            }
+            binder_dump_txn(txn);
+            if (bio) {
+                bio_init_from_txn(bio, txn);
+                bio = 0;
+            } else {
+                /* todo FREE BUFFER */
+            }
+            ptr += sizeof(*txn);
+            r = 0;
+            break;
+        }
+        case BR_DEAD_BINDER: {
+            struct binder_death *death = (struct binder_death *)(uintptr_t) *(binder_uintptr_t *)ptr;
+            ptr += sizeof(binder_uintptr_t);
+            death->func(bs, death->ptr);
+            break;
+        }
+        case BR_FAILED_REPLY:
+            r = -1;
+            break;
+        case BR_DEAD_REPLY:
+            r = -1;
+            break;
+        default:
+            ALOGE("parse: OOPS %d\n", cmd);
+            return -1;
+        }
+    }
+
+    return r;
+}
+
+void binder_acquire(struct binder_state *bs, uint32_t target)
+{
+    uint32_t cmd[2];
+    cmd[0] = BC_ACQUIRE;
+    cmd[1] = target;
+    binder_write(bs, cmd, sizeof(cmd));
+}
+
+void binder_release(struct binder_state *bs, uint32_t target)
+{
+    uint32_t cmd[2];
+    cmd[0] = BC_RELEASE;
+    cmd[1] = target;
+    binder_write(bs, cmd, sizeof(cmd));
+}
+
+void binder_link_to_death(struct binder_state *bs, uint32_t target, struct binder_death *death)
+{
+    struct {
+        uint32_t cmd;
+        struct binder_handle_cookie payload;
+    } __attribute__((packed)) data;
+
+    data.cmd = BC_REQUEST_DEATH_NOTIFICATION;
+    data.payload.handle = target;
+    data.payload.cookie = (uintptr_t) death;
+    binder_write(bs, &data, sizeof(data));
+}
+
+int binder_call(struct binder_state *bs,
+                struct binder_io *msg, struct binder_io *reply,
+                uint32_t target, uint32_t code)
+{
+    int res;
+    struct binder_write_read bwr;
+    struct {
+        uint32_t cmd;
+        struct binder_transaction_data txn;
+    } __attribute__((packed)) writebuf;
+    unsigned readbuf[32];
+
+    if (msg->flags & BIO_F_OVERFLOW) {
+        fprintf(stderr,"binder: txn buffer overflow\n");
+        goto fail;
+    }
+
+    writebuf.cmd = BC_TRANSACTION;
+    writebuf.txn.target.handle = target;
+    writebuf.txn.code = code;
+    writebuf.txn.flags = 0;
+    writebuf.txn.data_size = msg->data - msg->data0;
+    writebuf.txn.offsets_size = ((char*) msg->offs) - ((char*) msg->offs0);
+    writebuf.txn.data.ptr.buffer = (uintptr_t)msg->data0;
+    writebuf.txn.data.ptr.offsets = (uintptr_t)msg->offs0;
+
+    bwr.write_size = sizeof(writebuf);
+    bwr.write_consumed = 0;
+    bwr.write_buffer = (uintptr_t) &writebuf;
+
+    hexdump(msg->data0, msg->data - msg->data0);
+    for (;;) {
+        bwr.read_size = sizeof(readbuf);
+        bwr.read_consumed = 0;
+        bwr.read_buffer = (uintptr_t) readbuf;
+
+        res = ioctl(bs->fd, BINDER_WRITE_READ, &bwr);
+
+        if (res < 0) {
+            fprintf(stderr,"binder: ioctl failed (%s)\n", strerror(errno));
+            goto fail;
+        }
+
+        res = binder_parse(bs, reply, (uintptr_t) readbuf, bwr.read_consumed, 0);
+        if (res == 0) return 0;
+        if (res < 0) goto fail;
+    }
+
+fail:
+    memset(reply, 0, sizeof(*reply));
+    reply->flags |= BIO_F_IOERROR;
+    return -1;
+}
+
+void binder_loop(struct binder_state *bs, binder_handler func)
+{
+    int res;
+    struct binder_write_read bwr;
+    uint32_t readbuf[32];
+
+    bwr.write_size = 0;
+    bwr.write_consumed = 0;
+    bwr.write_buffer = 0;
+
+    readbuf[0] = BC_ENTER_LOOPER;
+    binder_write(bs, readbuf, sizeof(uint32_t));
+
+    for (;;) {
+        bwr.read_size = sizeof(readbuf);
+        bwr.read_consumed = 0;
+        bwr.read_buffer = (uintptr_t) readbuf;
+
+        res = ioctl(bs->fd, BINDER_WRITE_READ, &bwr);
+
+        if (res < 0) {
+            ALOGE("binder_loop: ioctl failed (%s)\n", strerror(errno));
+            break;
+        }
+
+        res = binder_parse(bs, 0, (uintptr_t) readbuf, bwr.read_consumed, func);
+        if (res == 0) {
+            ALOGE("binder_loop: unexpected reply?!\n");
+            break;
+        }
+        if (res < 0) {
+            ALOGE("binder_loop: io error %d %s\n", res, strerror(errno));
+            break;
+        }
+    }
+}
+
+void bio_init_from_txn(struct binder_io *bio, struct binder_transaction_data *txn)
+{
+    bio->data = bio->data0 = (char *)(intptr_t)txn->data.ptr.buffer;
+    bio->offs = bio->offs0 = (binder_size_t *)(intptr_t)txn->data.ptr.offsets;
+    bio->data_avail = txn->data_size;
+    bio->offs_avail = txn->offsets_size / sizeof(size_t);
+    bio->flags = BIO_F_SHARED;
+}
+
+void bio_init(struct binder_io *bio, void *data,
+              size_t maxdata, size_t maxoffs)
+{
+    size_t n = maxoffs * sizeof(size_t);
+
+    if (n > maxdata) {
+        bio->flags = BIO_F_OVERFLOW;
+        bio->data_avail = 0;
+        bio->offs_avail = 0;
+        return;
+    }
+
+    bio->data = bio->data0 = (char *) data + n;
+    bio->offs = bio->offs0 = data;
+    bio->data_avail = maxdata - n;
+    bio->offs_avail = maxoffs;
+    bio->flags = 0;
+}
+
+static void *bio_alloc(struct binder_io *bio, size_t size)
+{
+    size = (size + 3) & (~3);
+    if (size > bio->data_avail) {
+        bio->flags |= BIO_F_OVERFLOW;
+        return NULL;
+    } else {
+        void *ptr = bio->data;
+        bio->data += size;
+        bio->data_avail -= size;
+        return ptr;
+    }
+}
+
+void binder_done(struct binder_state *bs,
+                 __unused struct binder_io *msg,
+                 struct binder_io *reply)
+{
+    struct {
+        uint32_t cmd;
+        uintptr_t buffer;
+    } __attribute__((packed)) data;
+
+    if (reply->flags & BIO_F_SHARED) {
+        data.cmd = BC_FREE_BUFFER;
+        data.buffer = (uintptr_t) reply->data0;
+        binder_write(bs, &data, sizeof(data));
+        reply->flags = 0;
+    }
+}
+
+static struct flat_binder_object *bio_alloc_obj(struct binder_io *bio)
+{
+    struct flat_binder_object *obj;
+
+    obj = bio_alloc(bio, sizeof(*obj));
+
+    if (obj && bio->offs_avail) {
+        bio->offs_avail--;
+        *bio->offs++ = ((char*) obj) - ((char*) bio->data0);
+        return obj;
+    }
+
+    bio->flags |= BIO_F_OVERFLOW;
+    return NULL;
+}
+
+void bio_put_uint32(struct binder_io *bio, uint32_t n)
+{
+    uint32_t *ptr = bio_alloc(bio, sizeof(n));
+    if (ptr)
+        *ptr = n;
+}
+
+void bio_put_obj(struct binder_io *bio, void *ptr)
+{
+    struct flat_binder_object *obj;
+
+    obj = bio_alloc_obj(bio);
+    if (!obj)
+        return;
+
+    obj->flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
+    obj->type = BINDER_TYPE_BINDER;
+    obj->binder = (uintptr_t)ptr;
+    obj->cookie = 0;
+}
+
+void bio_put_ref(struct binder_io *bio, uint32_t handle)
+{
+    struct flat_binder_object *obj;
+
+    if (handle)
+        obj = bio_alloc_obj(bio);
+    else
+        obj = bio_alloc(bio, sizeof(*obj));
+
+    if (!obj)
+        return;
+
+    obj->flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS;
+    obj->type = BINDER_TYPE_HANDLE;
+    obj->handle = handle;
+    obj->cookie = 0;
+}
+
+void bio_put_string16(struct binder_io *bio, const uint16_t *str)
+{
+    size_t len;
+    uint16_t *ptr;
+
+    if (!str) {
+        bio_put_uint32(bio, 0xffffffff);
+        return;
+    }
+
+    len = 0;
+    while (str[len]) len++;
+
+    if (len >= (MAX_BIO_SIZE / sizeof(uint16_t))) {
+        bio_put_uint32(bio, 0xffffffff);
+        return;
+    }
+
+    /* Note: The payload will carry 32bit size instead of size_t */
+    bio_put_uint32(bio, (uint32_t) len);
+    len = (len + 1) * sizeof(uint16_t);
+    ptr = bio_alloc(bio, len);
+    if (ptr)
+        memcpy(ptr, str, len);
+}
+
+void bio_put_string16_x(struct binder_io *bio, const char *_str)
+{
+    unsigned char *str = (unsigned char*) _str;
+    size_t len;
+    uint16_t *ptr;
+
+    if (!str) {
+        bio_put_uint32(bio, 0xffffffff);
+        return;
+    }
+
+    len = strlen(_str);
+
+    if (len >= (MAX_BIO_SIZE / sizeof(uint16_t))) {
+        bio_put_uint32(bio, 0xffffffff);
+        return;
+    }
+
+    /* Note: The payload will carry 32bit size instead of size_t */
+    bio_put_uint32(bio, len);
+    ptr = bio_alloc(bio, (len + 1) * sizeof(uint16_t));
+    if (!ptr)
+        return;
+
+    while (*str)
+        *ptr++ = *str++;
+    *ptr++ = 0;
+}
+
+static void *bio_get(struct binder_io *bio, size_t size)
+{
+    size = (size + 3) & (~3);
+
+    if (bio->data_avail < size){
+        bio->data_avail = 0;
+        bio->flags |= BIO_F_OVERFLOW;
+        return NULL;
+    }  else {
+        void *ptr = bio->data;
+        bio->data += size;
+        bio->data_avail -= size;
+        return ptr;
+    }
+}
+
+uint32_t bio_get_uint32(struct binder_io *bio)
+{
+    uint32_t *ptr = bio_get(bio, sizeof(*ptr));
+    return ptr ? *ptr : 0;
+}
+
+uint16_t *bio_get_string16(struct binder_io *bio, size_t *sz)
+{
+    size_t len;
+
+    /* Note: The payload will carry 32bit size instead of size_t */
+    len = (size_t) bio_get_uint32(bio);
+    if (sz)
+        *sz = len;
+    return bio_get(bio, (len + 1) * sizeof(uint16_t));
+}
+
+static struct flat_binder_object *_bio_get_obj(struct binder_io *bio)
+{
+    size_t n;
+    size_t off = bio->data - bio->data0;
+
+    /* TODO: be smarter about this? */
+    for (n = 0; n < bio->offs_avail; n++) {
+        if (bio->offs[n] == off)
+            return bio_get(bio, sizeof(struct flat_binder_object));
+    }
+
+    bio->data_avail = 0;
+    bio->flags |= BIO_F_OVERFLOW;
+    return NULL;
+}
+
+uint32_t bio_get_ref(struct binder_io *bio)
+{
+    struct flat_binder_object *obj;
+
+    obj = _bio_get_obj(bio);
+    if (!obj)
+        return 0;
+
+    if (obj->type == BINDER_TYPE_HANDLE)
+        return obj->handle;
+
+    return 0;
+}

03_day/binder_2/binder.h

@@ -0,0 +1,73 @@
+/* Copyright 2008 The Android Open Source Project
+ */
+#ifndef _BINDER_H_
+#define _BINDER_H_
+#include <sys/ioctl.h>
+#include <linux/android/binder.h>
+struct binder_state;
+struct binder_io
+{
+    char *data;            /* pointer to read/write from */
+    binder_size_t *offs;   /* array of offsets */
+    size_t data_avail;     /* bytes available in data buffer */
+    size_t offs_avail;     /* entries available in offsets array */
+    char *data0;           /* start of data buffer */
+    binder_size_t *offs0;  /* start of offsets buffer */
+    uint32_t flags;
+    uint32_t unused;
+};
+struct binder_death {
+    void (*func)(struct binder_state *bs, void *ptr);
+    void *ptr;
+};
+/* the one magic handle */
+#define BINDER_SERVICE_MANAGER  0U
+#define SVC_MGR_NAME "android.os.IServiceManager"
+enum {
+    /* Must match definitions in IBinder.h and IServiceManager.h */
+    PING_TRANSACTION  = B_PACK_CHARS('_','P','N','G'),
+    SVC_MGR_GET_SERVICE = 1,
+    SVC_MGR_CHECK_SERVICE,
+    SVC_MGR_ADD_SERVICE,
+    SVC_MGR_LIST_SERVICES,
+};
+typedef int (*binder_handler)(struct binder_state *bs,
+                              struct binder_transaction_data *txn,
+                              struct binder_io *msg,
+                              struct binder_io *reply);
+struct binder_state *binder_open(const char* driver, size_t mapsize);
+void binder_close(struct binder_state *bs);
+/* initiate a blocking binder call
+ * - returns zero on success
+ */
+int binder_call(struct binder_state *bs,
+                struct binder_io *msg, struct binder_io *reply,
+                uint32_t target, uint32_t code);
+/* release any state associate with the binder_io
+ * - call once any necessary data has been extracted from the
+ *   binder_io after binder_call() returns
+ * - can safely be called even if binder_call() fails
+ */
+void binder_done(struct binder_state *bs,
+                 struct binder_io *msg, struct binder_io *reply);
+/* manipulate strong references */
+void binder_acquire(struct binder_state *bs, uint32_t target);
+void binder_release(struct binder_state *bs, uint32_t target);
+void binder_link_to_death(struct binder_state *bs, uint32_t target, struct binder_death *death);
+void binder_loop(struct binder_state *bs, binder_handler func);
+int binder_become_context_manager(struct binder_state *bs);
+/* allocate a binder_io, providing a stack-allocated working
+ * buffer, size of the working buffer, and how many object
+ * offset entries to reserve from the buffer
+ */
+void bio_init(struct binder_io *bio, void *data,
+           size_t maxdata, size_t maxobjects);
+void bio_put_obj(struct binder_io *bio, void *ptr);
+void bio_put_ref(struct binder_io *bio, uint32_t handle);
+void bio_put_uint32(struct binder_io *bio, uint32_t n);
+void bio_put_string16(struct binder_io *bio, const uint16_t *str);
+void bio_put_string16_x(struct binder_io *bio, const char *_str);
+uint32_t bio_get_uint32(struct binder_io *bio);
+uint16_t *bio_get_string16(struct binder_io *bio, size_t *sz);
+uint32_t bio_get_ref(struct binder_io *bio);
+#endif

03_day/binder_2/my_client.c

@@ -0,0 +1,55 @@
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "binder.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;
+}
+
+int main(int argc, char **argv)
+{
+	struct binder_state *bs;
+	uint32_t svcmgr = BINDER_SERVICE_MANAGER;
+	uint32_t handle;
+    unsigned iodata[512/4];
+    struct binder_io msg, reply;
+
+	bs = binder_open("/dev/binder", 128*1024);
+	if (!bs) {
+		fprintf(stderr, "failed to open binder driver\n");
+		return -1;
+	}
+
+	handle = svcmgr_lookup(bs, svcmgr, argv[argc-1]);
+	fprintf(stderr,"lookup(%s) = %x\n", argv[argc-1], handle);
+
+    bio_init(&msg, iodata, sizeof(iodata), 4);
+
+    binder_call(bs, &msg, &reply, handle, 1);
+    binder_call(bs, &msg, &reply, handle, 2);
+	return 0;
+}

03_day/binder_2/my_server.c

@@ -0,0 +1,99 @@
+/* Copyright 2008 The Android Open Source Project
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "binder.h"
+
+typedef struct
+{
+	void (*on)(void);
+	void (*off)(void);
+} LED_INFO;
+
+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;
+}
+
+int my_handler(struct binder_state *bs,
+                              struct binder_transaction_data *txn,
+                              struct binder_io *msg,
+                              struct binder_io *reply)
+{
+	printf("my_handler %p %p %p %p\n", bs, txn, msg, reply);
+	LED_INFO *Led = (LED_INFO*)txn->target.ptr;
+	switch(txn->code) {
+		case 1:
+			{
+				Led->on();
+				return 0;
+			}
+		case 2:
+			{
+				Led->off();
+				return 0;
+			}
+
+		default:
+			printf("unknown code %d\n", txn->code);
+			return -1;
+	}
+
+	bio_put_uint32(reply, 0);
+	return 0;
+}
+
+void ledOn(void)
+{
+	printf("Server : ledOn\n");
+}
+
+void ledOff(void)
+{
+	printf("Server : ledOff\n");
+}
+
+int main(int argc, char **argv)
+{
+	struct binder_state *bs;
+	uint32_t svcmgr = BINDER_SERVICE_MANAGER;
+	LED_INFO *Led;
+
+	bs = binder_open("/dev/binder", 128*1024);
+	if (!bs) {
+		fprintf(stderr, "failed to open binder driver\n");
+		return -1;
+	}
+	Led = (LED_INFO*)malloc( sizeof(LED_INFO) );
+	Led->on = ledOn;
+	Led->off = ledOff;
+
+	printf("Server : &token = %p\n", Led );
+	svcmgr_publish(bs, svcmgr, argv[argc-1], Led);
+	binder_loop(bs, my_handler);
+	return 0;
+}
+
+
+

03_day/sp/sp.cpp

@@ -0,0 +1,341 @@
+#if 1
+#include <stdio.h>
+
+class AAA
+{
+	int mRefs;
+	public:
+		AAA():mRefs(0) { printf("AAA::AAA()\n"); }
+		~AAA() { printf("AAA::~AAA()\n"); }
+		void foo() { printf("AAA::foo()\n"); }
+		void incStrong() { 
+			printf("AAA::incStrong() : mRefs=%d\n", ++mRefs); 
+		}
+		void decStrong() 
+		{ 
+			--mRefs;
+			printf("AAA::decStrong() : mRefs=%d\n", mRefs); 
+			if( mRefs == 0 )
+				delete this;
+		}
+};
+
+template < typename T >
+class sp
+{
+	T *mPtr;
+	public:
+		sp( T *ptr):mPtr(ptr) { 
+			printf("sp::sp(T)\n"); 
+			mPtr->incStrong();
+		}
+		sp( const sp<T> &r ) : mPtr(r.mPtr) { 
+			printf("sp::sp(sp<T>)\n"); 
+			mPtr->incStrong();
+		}
+
+		~sp() { 
+			printf("sp::~sp()\n"); 
+			mPtr->decStrong();
+		}
+
+		T * operator->()
+		{
+			return mPtr;
+		}
+		T operator*()
+		{
+			return *mPtr;
+		}
+};
+
+int main()
+{
+	{
+		sp<AAA> p1 = new AAA;
+		sp<AAA> p2 = p1;
+		p1->foo();  
+		p2->foo();  
+	}
+	return 0;
+}
+#endif
+#if 0
+#include <stdio.h>
+
+class AAA
+{
+	public:
+		AAA() { printf("AAA::AAA()\n"); }
+		~AAA() { printf("AAA::~AAA()\n"); }
+		void foo() { printf("AAA::foo()\n"); }
+};
+
+template < typename T >
+class sp
+{
+	T *mPtr;
+	static int mRefs;
+	public:
+		sp( T *ptr):mPtr(ptr) { 
+			mRefs=1;
+			printf("sp::sp(T), mRefs=%d\n", mRefs); 
+		}
+		sp( const sp<T> &r ) { 
+			mRefs++;
+			printf("sp::sp(sp<T>), mRefs=%d\n", mRefs); 
+		}
+
+		~sp() { 
+			printf("sp::~sp()\n"); 
+			if( --mRefs == 0 )
+				delete mPtr;
+		}
+
+		T * operator->()
+		{
+			return mPtr;
+		}
+		T operator*()
+		{
+			return *mPtr;
+		}
+};
+
+template < typename T >
+int sp<T>::mRefs = 0;
+
+int main()
+{
+	{
+		sp<AAA> p1 = new AAA;
+		sp<AAA> p2 = p1;
+		p1->foo();  
+		p2->foo();  
+	}
+	return 0;
+}
+#endif
+#if 0
+#include <stdio.h>
+
+class AAA
+{
+	public:
+		AAA() { printf("AAA::AAA()\n"); }
+		~AAA() { printf("AAA::~AAA()\n"); }
+		void foo() { printf("AAA::foo()\n"); }
+};
+
+template < typename T >
+class sp
+{
+	T *mPtr;
+	public:
+		sp( T *ptr):mPtr(ptr) { printf("sp::sp()\n"); }
+		~sp() { 
+			printf("sp::~sp()\n"); 
+			delete mPtr;
+		}
+
+		T * operator->()
+		{
+			return mPtr;
+		}
+		T operator*()
+		{
+			return *mPtr;
+		}
+};
+
+int main()
+{
+	{
+		sp<AAA> p1 = new AAA;
+		sp<AAA> p2 = p1;
+		p1->foo();  
+		p2->foo();  
+	}
+	return 0;
+}
+#endif
+#if 0
+#include <stdio.h>
+
+class AAA
+{
+	public:
+		AAA() { printf("AAA::AAA()\n"); }
+		~AAA() { printf("AAA::~AAA()\n"); }
+		void foo() { printf("AAA::foo()\n"); }
+};
+class BBB
+{
+	public:
+		BBB() { printf("BBB::BBB()\n"); }
+		~BBB() { printf("BBB::~BBB()\n"); }
+		void foo() { printf("BBB::foo()\n"); }
+};
+
+template < typename T >
+class sp
+{
+	T *mPtr;
+	public:
+		sp( T *ptr):mPtr(ptr) { printf("sp::sp()\n"); }
+		~sp() { 
+			printf("sp::~sp()\n"); 
+			delete mPtr;
+		}
+
+		T * operator->()
+		{
+			return mPtr;
+		}
+		T operator*()
+		{
+			return *mPtr;
+		}
+};
+
+int main()
+{
+	{
+		sp<AAA> pa = new AAA;
+		pa->foo();  
+
+		sp<BBB> pb = new BBB;
+		pb->foo();  
+	}
+	return 0;
+}
+#endif
+#if 0
+#include <stdio.h>
+
+class AAA
+{
+	public:
+		AAA() { printf("AAA::AAA()\n"); }
+		~AAA() { printf("AAA::~AAA()\n"); }
+		void foo() { printf("AAA::foo()\n"); }
+};
+
+class sp
+{
+	AAA *mPtr;
+	public:
+		sp( AAA *ptr):mPtr(ptr) { printf("sp::sp()\n"); }
+		~sp() { 
+			printf("sp::~sp()\n"); 
+			delete mPtr;
+		}
+
+		AAA * operator->()
+		{
+			return mPtr;
+		}
+		AAA operator*()
+		{
+			return *mPtr;
+		}
+};
+
+int main()
+{
+	{
+		sp pa = new AAA;
+		pa->foo();   // pa.operator->()->foo();
+
+		(*pa).foo();
+	}
+	return 0;
+}
+#endif
+#if 0
+#include <stdio.h>
+
+class AAA
+{
+	public:
+		AAA() { printf("AAA::AAA()\n"); }
+		~AAA() { printf("AAA::~AAA()\n"); }
+		void foo() { printf("AAA::foo()\n"); }
+};
+
+class sp
+{
+	AAA *mPtr;
+	public:
+		sp( AAA *ptr):mPtr(ptr) { printf("sp::sp()\n"); }
+		~sp() { 
+			printf("sp::~sp()\n"); 
+			delete mPtr;
+		}
+};
+
+int main()
+{
+	{
+		//AAA* pa = new AAA;
+		//pa->foo();
+		sp pa = new AAA;
+		pa->foo();   // pa.operator->()->foo();
+	}
+	return 0;
+}
+#endif
+
+#if 0
+#include <stdio.h>
+
+class AAA
+{
+	public:
+		AAA() { printf("AAA::AAA()\n"); }
+		~AAA() { printf("AAA::~AAA()\n"); }
+};
+
+int main()
+{
+	AAA *pa = new AAA;
+	//...
+	return 0;
+}
+#endif
+
+#if 0
+#include <stdio.h>
+
+class AAA
+{
+	public:
+		AAA() { printf("AAA::AAA()\n"); }
+		~AAA() { printf("AAA::~AAA()\n"); }
+};
+
+int main()
+{
+	AAA *pa = new AAA;
+	delete pa;
+	//...
+	return 0;
+}
+#endif
+
+#if 0
+#include <stdio.h>
+
+class AAA
+{
+	public:
+		AAA() { printf("AAA::AAA()\n"); }
+		~AAA() { printf("AAA::~AAA()\n"); }
+};
+
+int main()
+{
+	AAA aaa;
+	return 0;
+}
+#endif