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| 1 | +# Android Binder通信 |
| 2 | + |
| 3 | +在树莓派中理解Android Binder通信 |
| 4 | + |
| 5 | +## 参考文档 |
| 6 | + |
| 7 | +* https://github.com/hungys/binder-for-linux |
| 8 | +* [0005_内核编译.md](0005_内核编译.md) |
| 9 | + |
| 10 | +## 内核支持Binder |
| 11 | + |
| 12 | +* make menuconfig |
| 13 | + ``` |
| 14 | + .config - Linux/arm 5.4.83 Kernel Configuration |
| 15 | + → Device Drivers → Android ─────────────────────────────────────────────────── |
| 16 | + ┌──────────────────────────────── Android ────────────────────────────────┐ |
| 17 | + │ Arrow keys navigate the menu. <Enter> selects submenus ---> (or empty │ |
| 18 | + │ submenus ----). Highlighted letters are hotkeys. Pressing <Y> │ |
| 19 | + │ includes, <N> excludes, <M> modularizes features. Press <Esc><Esc> to │ |
| 20 | + │ exit, <?> for Help, </> for Search. Legend: [*] built-in [ ] │ |
| 21 | + │ ┌─────────────────────────────────────────────────────────────────────┐ │ |
| 22 | + │ │ [*] Android Drivers │ │ |
| 23 | + │ │ [*] Android Binder IPC Driver │ │ |
| 24 | + │ │ [ ] Android Binderfs filesystem │ │ |
| 25 | + │ │ (binder,hwbinder,vndbinder) Android Binder devices │ │ |
| 26 | + │ │ [ ] Android Binder IPC Driver Selftest │ │ |
| 27 | + │ │ │ │ |
| 28 | + │ │ │ │ |
| 29 | + │ │ │ │ |
| 30 | + │ │ │ │ |
| 31 | + │ └─────────────────────────────────────────────────────────────────────┘ │ |
| 32 | + ├─────────────────────────────────────────────────────────────────────────┤ |
| 33 | + │ <Select> < Exit > < Help > < Save > < Load > │ |
| 34 | + └─────────────────────────────────────────────────────────────────────────┘ |
| 35 | + ``` |
| 36 | + * [Device Drivers] -> [Android] |
| 37 | +* KERNEL=kernel7l |
| 38 | +* make -j4 zImage |
| 39 | + ``` |
| 40 | + scripts/kconfig/conf --syncconfig Kconfig |
| 41 | + CALL scripts/atomic/check-atomics.sh |
| 42 | + CALL scripts/checksyscalls.sh |
| 43 | + CHK include/generated/compile.h |
| 44 | + CC drivers/android/binder.o |
| 45 | + CC drivers/android/binder_alloc.o |
| 46 | + AR drivers/android/built-in.a |
| 47 | + AR drivers/staging/android/ion/built-in.a |
| 48 | + AR drivers/staging/android/built-in.a |
| 49 | + AR drivers/staging/built-in.a |
| 50 | + AR drivers/built-in.a |
| 51 | + GEN .version |
| 52 | + CHK include/generated/compile.h |
| 53 | + UPD include/generated/compile.h |
| 54 | + CC init/version.o |
| 55 | + AR init/built-in.a |
| 56 | + LD vmlinux.o |
| 57 | + MODPOST vmlinux.o |
| 58 | + MODINFO modules.builtin.modinfo |
| 59 | + LD .tmp_vmlinux.kallsyms1 |
| 60 | + KSYM .tmp_vmlinux.kallsyms1.o |
| 61 | + LD .tmp_vmlinux.kallsyms2 |
| 62 | + KSYM .tmp_vmlinux.kallsyms2.o |
| 63 | + LD vmlinux |
| 64 | + SORTEX vmlinux |
| 65 | + SYSMAP System.map |
| 66 | + OBJCOPY arch/arm/boot/Image |
| 67 | + Kernel: arch/arm/boot/Image is ready |
| 68 | + GZIP arch/arm/boot/compressed/piggy_data |
| 69 | + AS arch/arm/boot/compressed/piggy.o |
| 70 | + LD arch/arm/boot/compressed/vmlinux |
| 71 | + OBJCOPY arch/arm/boot/zImage |
| 72 | + Kernel: arch/arm/boot/zImage is ready |
| 73 | + ``` |
| 74 | +* sudo cp arch/arm/boot/zImage /boot/$KERNEL.img |
| 75 | +* sudo sync |
| 76 | +* sudo reboot |
| 77 | +* ls -al /dev/*binder |
| 78 | + ``` |
| 79 | + crw------- 1 root root 10, 61 Mar 5 13:02 /dev/binder |
| 80 | + crw------- 1 root root 10, 60 Mar 5 13:02 /dev/hwbinder |
| 81 | + crw------- 1 root root 10, 59 Mar 5 13:02 /dev/vndbinder |
| 82 | + ``` |
| 83 | +* [Binder示例代码](https://github.com/LowLevelOfLogic/RaspberryPi/tree/servicemanager) |
| 84 | + * make |
| 85 | +* sudo ./servicemanager |
| 86 | +* bctest |
| 87 | + * sudo ./bctest publish zengjf |
| 88 | + * sudo ./bctest lookup zengjf |
| 89 | +* 函数调用： |
| 90 | + * sudo ./service |
| 91 | + * sudo ./bctest lookup calculate |
| 92 | + * sudo ./client a 110 |
| 93 | +*  |
| 94 | + |
| 95 | +## Android中bctest补丁 |
| 96 | + |
| 97 | +新的Android版本的bctest没有更新，需要加一些代码才能正常使用 |
| 98 | + |
| 99 | +```diff |
| 100 | +diff --git a/frameworks/native/cmds/servicemanager/bctest.c b/frameworks/native/cmds/servicemanager/bctest.c |
| 101 | +index 354df670e54..782bf29e958 100644 |
| 102 | +--- a/frameworks/native/cmds/servicemanager/bctest.c |
| 103 | ++++ b/frameworks/native/cmds/servicemanager/bctest.c |
| 104 | +@@ -16,6 +16,7 @@ uint32_t svcmgr_lookup(struct binder_state *bs, uint32_t target, const char *nam |
| 105 | + |
| 106 | + bio_init(&msg, iodata, sizeof(iodata), 4); |
| 107 | + bio_put_uint32(&msg, 0); // strict mode header |
| 108 | ++ bio_put_uint32(&msg, 0); |
| 109 | + bio_put_string16_x(&msg, SVC_MGR_NAME); |
| 110 | + bio_put_string16_x(&msg, name); |
| 111 | + |
| 112 | +@@ -40,6 +41,7 @@ int svcmgr_publish(struct binder_state *bs, uint32_t target, const char *name, v |
| 113 | + |
| 114 | + bio_init(&msg, iodata, sizeof(iodata), 4); |
| 115 | + bio_put_uint32(&msg, 0); // strict mode header |
| 116 | ++ bio_put_uint32(&msg, 0); |
| 117 | + bio_put_string16_x(&msg, SVC_MGR_NAME); |
| 118 | + bio_put_string16_x(&msg, name); |
| 119 | + bio_put_obj(&msg, ptr); |
| 120 | +@@ -93,9 +95,12 @@ int main(int argc, char **argv) |
| 121 | + fprintf(stderr,"argument required\n"); |
| 122 | + return -1; |
| 123 | + } |
| 124 | ++ fprintf(stderr,"published: [%s]\n", argv[1]); |
| 125 | + svcmgr_publish(bs, svcmgr, argv[1], &token); |
| 126 | + argc--; |
| 127 | + argv++; |
| 128 | ++ |
| 129 | ++ while(1); |
| 130 | + } else { |
| 131 | + fprintf(stderr,"unknown command %s\n", argv[0]); |
| 132 | + return -1; |
| 133 | +``` |
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