参考：
https://blog.csdn.net/u013028621/article/details/116271537
https://blog.csdn.net/nanyou519/article/details/104953960
http://www.javashuo.com/article/p-svltvgwh-rx.html
上文：http://www.gaohaiyan.com/4047.html
这里还是只看 system/core/rootdir/init.rc
当LoadBootScripts解析完后，ActionManager就开始启动各个指令。
下面代码明确的触发了3个指令：early-init、init、late-init：
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int SecondStageMain(int argc, char** argv) { // .... ActionManager& am = ActionManager::GetInstance(); ServiceList& sm = ServiceList::GetInstance(); // .... LoadBootScripts(am, sm); // .... am.QueueEventTrigger("early-init"); //【--- 1 -->】 // .... am.QueueEventTrigger("init"); //【--- 2 -->】 // .... am.QueueEventTrigger("late-init"); //【--- 3 -->】 // .... while (true) { // .... if ( !( prop_waiter_state.MightBeWaiting() || Service::is_exec_service_running() ) ) { am.ExecuteOneCommand(); } // .... } return 0; } |
1.early-init
这里是为Android做一些初始化操作，创建一些属性文件、目录、设定目录权限、启动服务等。后面的2个section，还会根据手机处理器位数启动特定服务。
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# 约15行 # Cgroups are mounted right before early-init using list from /etc/cgroups.json on early-init write /proc/sys/kernel/sysrq 0 write /proc/sys/kernel/modprobe \n restorecon /adb_keys restorecon /postinstall mkdir /acct/uid chown root system /dev/memcg/memory.pressure_level chmod 0040 /dev/memcg/memory.pressure_level mkdir /dev/memcg/apps/ 0755 system system mkdir /dev/memcg/system 0550 system system mkdir /dev/net 0755 root root symlink ../tun /dev/net/tun setrlimit nice 40 40 setrlimit nofile 32768 32768 mkdir /linkerconfig/bootstrap 0755 mkdir /linkerconfig/default 0755 write /sys/module/dm_verity/parameters/prefetch_cluster 0 exec -- /system/bin/linkerconfig --target /linkerconfig/bootstrap chmod 644 /linkerconfig/bootstrap/ld.config.txt copy /linkerconfig/bootstrap/ld.config.txt /linkerconfig/default/ld.config.txt chmod 644 /linkerconfig/default/ld.config.txt mount none /linkerconfig/bootstrap /linkerconfig bind rec start ueventd exec_start apexd-bootstrap update_linker_config mkdir /dev/boringssl 0755 root root mkdir /dev/boringssl/selftest 0755 root root mount tracefs tracefs /sys/kernel/tracing # Run boringssl self test for each ABI so that later processes can skip it. http://b/139348610 on early-init && property:ro.product.cpu.abilist32=* exec_start boringssl_self_test32 on early-init && property:ro.product.cpu.abilist64=* exec_start boringssl_self_test64 |
2.init
同样是创建一些属性文件、目录、设定目录权限、启动服务等。后面的section中property:ro.debuggable=1指如果开启了调试模式，还会启动console服务。
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# 约114行 on init sysclktz 0 copy /proc/cmdline /dev/urandom copy /system/etc/prop.default /dev/urandom symlink /proc/self/fd/0 /dev/stdin symlink /proc/self/fd/1 /dev/stdout symlink /proc/self/fd/2 /dev/stderr mkdir /dev/stune/foreground mkdir /dev/stune/background mkdir /dev/stune/top-app mkdir /dev/stune/rt chown system system /dev/stune chown system system /dev/stune/foreground chown system system /dev/stune/background chown system system /dev/stune/top-app chown system system /dev/stune/rt chown system system /dev/stune/tasks chown system system /dev/stune/foreground/tasks chown system system /dev/stune/background/tasks chown system system /dev/stune/top-app/tasks chown system system /dev/stune/rt/tasks chmod 0664 /dev/stune/tasks chmod 0664 /dev/stune/foreground/tasks chmod 0664 /dev/stune/background/tasks chmod 0664 /dev/stune/top-app/tasks chmod 0664 /dev/stune/rt/tasks mkdir /dev/stune/nnapi-hal chown system system /dev/stune/nnapi-hal chown system system /dev/stune/nnapi-hal/tasks chmod 0664 /dev/stune/nnapi-hal/tasks write /dev/stune/nnapi-hal/schedtune.boost 1 write /dev/stune/nnapi-hal/schedtune.prefer_idle 1 mkdir /dev/blkio/background chown system system /dev/blkio chown system system /dev/blkio/background chown system system /dev/blkio/tasks chown system system /dev/blkio/background/tasks chmod 0664 /dev/blkio/tasks chmod 0664 /dev/blkio/background/tasks write /dev/blkio/blkio.weight 1000 write /dev/blkio/background/blkio.weight 200 write /dev/blkio/blkio.group_idle 0 write /dev/blkio/background/blkio.group_idle 0 restorecon_recursive /mnt mount configfs none /config nodev noexec nosuid chmod 0770 /config/sdcardfs chown system package_info /config/sdcardfs mkdir /dev/binderfs mount binder binder /dev/binderfs stats=global chmod 0755 /dev/binderfs mount fusectl none /sys/fs/fuse/connections symlink /dev/binderfs/binder /dev/binder symlink /dev/binderfs/hwbinder /dev/hwbinder symlink /dev/binderfs/vndbinder /dev/vndbinder chmod 0666 /dev/binderfs/hwbinder chmod 0666 /dev/binderfs/binder chmod 0666 /dev/binderfs/vndbinder mkdir /mnt/secure 0700 root root mkdir /mnt/secure/asec 0700 root root mkdir /mnt/asec 0755 root system mkdir /mnt/obb 0755 root system mkdir /mnt/media_rw 0750 root external_storage mkdir /mnt/user 0755 root root mkdir /mnt/user/0 0755 root root mkdir /mnt/user/0/self 0755 root root mkdir /mnt/user/0/emulated 0755 root root mkdir /mnt/user/0/emulated/0 0755 root root mkdir /mnt/pass_through 0700 root root mkdir /mnt/pass_through/0 0710 root media_rw mkdir /mnt/pass_through/0/self 0710 root media_rw mkdir /mnt/pass_through/0/emulated 0710 root media_rw mkdir /mnt/pass_through/0/emulated/0 0710 root media_rw mkdir /mnt/expand 0771 system system mkdir /mnt/appfuse 0711 root root mkdir /mnt/runtime 0700 root root mkdir /mnt/runtime/default 0755 root root mkdir /mnt/runtime/default/self 0755 root root mkdir /mnt/runtime/read 0755 root root mkdir /mnt/runtime/read/self 0755 root root mkdir /mnt/runtime/write 0755 root root mkdir /mnt/runtime/write/self 0755 root root mkdir /mnt/runtime/full 0755 root root mkdir /mnt/runtime/full/self 0755 root root symlink /storage/self/primary /mnt/sdcard symlink /mnt/user/0/primary /mnt/runtime/default/self/primary write /proc/sys/kernel/panic_on_oops 1 write /proc/sys/kernel/hung_task_timeout_secs 0 write /proc/cpu/alignment 4 write /proc/sys/kernel/sched_tunable_scaling 0 write /proc/sys/kernel/sched_latency_ns 10000000 write /proc/sys/kernel/sched_wakeup_granularity_ns 2000000 write /proc/sys/kernel/sched_child_runs_first 0 write /proc/sys/kernel/randomize_va_space 2 write /proc/sys/vm/mmap_min_addr 32768 write /proc/sys/net/ipv4/ping_group_range "0 2147483647" write /proc/sys/net/unix/max_dgram_qlen 600 write /proc/sys/kernel/sched_rt_runtime_us 950000 write /proc/sys/kernel/sched_rt_period_us 1000000 write /proc/sys/net/core/rmem_max 262144 write /proc/sys/net/core/wmem_max 262144 write /proc/sys/net/ipv4/fwmark_reflect 1 write /proc/sys/net/ipv6/fwmark_reflect 1 write /proc/sys/net/ipv4/tcp_fwmark_accept 1 write /proc/sys/net/ipv4/conf/all/accept_redirects 0 write /proc/sys/net/ipv6/conf/all/accept_redirects 0 chmod 0400 /proc/net/fib_trie chown system system /dev/cpuctl chown system system /dev/cpuctl/tasks chmod 0666 /dev/cpuctl/tasks write /dev/cpuctl/cpu.rt_period_us 1000000 write /dev/cpuctl/cpu.rt_runtime_us 950000 mkdir /dev/cpuset/foreground copy /dev/cpuset/cpus /dev/cpuset/foreground/cpus copy /dev/cpuset/mems /dev/cpuset/foreground/mems mkdir /dev/cpuset/background copy /dev/cpuset/cpus /dev/cpuset/background/cpus copy /dev/cpuset/mems /dev/cpuset/background/mems mkdir /dev/cpuset/system-background copy /dev/cpuset/cpus /dev/cpuset/system-background/cpus copy /dev/cpuset/mems /dev/cpuset/system-background/mems mkdir /dev/cpuset/restricted copy /dev/cpuset/cpus /dev/cpuset/restricted/cpus copy /dev/cpuset/mems /dev/cpuset/restricted/mems mkdir /dev/cpuset/top-app copy /dev/cpuset/cpus /dev/cpuset/top-app/cpus copy /dev/cpuset/mems /dev/cpuset/top-app/mems chown system system /dev/cpuset chown system system /dev/cpuset/foreground chown system system /dev/cpuset/background chown system system /dev/cpuset/system-background chown system system /dev/cpuset/top-app chown system system /dev/cpuset/restricted chown system system /dev/cpuset/tasks chown system system /dev/cpuset/foreground/tasks chown system system /dev/cpuset/background/tasks chown system system /dev/cpuset/system-background/tasks chown system system /dev/cpuset/top-app/tasks chown system system /dev/cpuset/restricted/tasks chmod 0775 /dev/cpuset/system-background chmod 0664 /dev/cpuset/foreground/tasks chmod 0664 /dev/cpuset/background/tasks chmod 0664 /dev/cpuset/system-background/tasks chmod 0664 /dev/cpuset/top-app/tasks chmod 0664 /dev/cpuset/restricted/tasks chmod 0664 /dev/cpuset/tasks chown system system /proc/pressure/memory chmod 0664 /proc/pressure/memory chown root net_bw_acct /proc/net/xt_qtaguid/ctrl chown root net_bw_stats /proc/net/xt_qtaguid/stats chmod 0644 /dev/xt_qtaguid mount bpf bpf /sys/fs/bpf nodev noexec nosuid mkdir /dev/fscklogs 0770 root system mount pstore pstore /sys/fs/pstore nodev noexec nosuid chown system log /sys/fs/pstore chmod 0550 /sys/fs/pstore chown system log /sys/fs/pstore/console-ramoops chmod 0440 /sys/fs/pstore/console-ramoops chown system log /sys/fs/pstore/console-ramoops-0 chmod 0440 /sys/fs/pstore/console-ramoops-0 chown system log /sys/fs/pstore/pmsg-ramoops-0 chmod 0440 /sys/fs/pstore/pmsg-ramoops-0 write /proc/sys/abi/swp 1 symlink /proc/self/fd /dev/fd export DOWNLOAD_CACHE /data/cache write /sys/class/leds/vibrator/trigger "transient" write /dev/cpu_variant:${ro.bionic.arch} ${ro.bionic.cpu_variant} chmod 0444 /dev/cpu_variant:${ro.bionic.arch} write /dev/cpu_variant:${ro.bionic.2nd_arch} ${ro.bionic.2nd_cpu_variant} chmod 0444 /dev/cpu_variant:${ro.bionic.2nd_arch} chown system system /sys/power/state chown system system /sys/power/wakeup_count chmod 0660 /sys/power/state chown radio wakelock /sys/power/wake_lock chown radio wakelock /sys/power/wake_unlock chmod 0660 /sys/power/wake_lock chmod 0660 /sys/power/wake_unlock start logd chown root system /sys/module/lowmemorykiller/parameters/adj chmod 0664 /sys/module/lowmemorykiller/parameters/adj chown root system /sys/module/lowmemorykiller/parameters/minfree chmod 0664 /sys/module/lowmemorykiller/parameters/minfree start lmkd start servicemanager start hwservicemanager start vndservicemanager # 约1053行 on init && property:ro.debuggable=1 start console |
3.late-init
这个厉害了，启动了一串其它Action。关注“trigger zygote-start”一项触发新的Action。
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# 约415行 # Mount filesystems and start core system services. on late-init trigger early-fs trigger fs trigger post-fs trigger late-fs trigger post-fs-data trigger load_persist_props_action trigger load_bpf_programs trigger zygote-start //【--- 4 -->】 trigger firmware_mounts_complete trigger early-boot trigger boot |
4.zygote-start
名称为zygote-start的action有6项。前3个用于挂载特定目录，是并列关系，对应“persist.sys.fuse”的不同情况；后3个用于下一步启动zygote进程，也是并列关系，对应“ro.crypto.state”的不同情况。看以“start”指令的Command，“start zygote”表示启动zygote服务(进程)。
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# 约797行 # Switch between sdcardfs and FUSE depending on persist property # TODO: Move this to ro property before launch because FDE devices # interact with persistent properties differently during boot on zygote-start && property:persist.sys.fuse=true # Mount default storage into root namespace mount none /mnt/user/0 /storage bind rec mount none none /storage slave rec on zygote-start && property:persist.sys.fuse=false # Mount default storage into root namespace mount none /mnt/runtime/default /storage bind rec mount none none /storage slave rec on zygote-start && property:persist.sys.fuse="" # Mount default storage into root namespace mount none /mnt/runtime/default /storage bind rec mount none none /storage slave rec # It is recommended to put unnecessary data/ initialization from post-fs-data # to start-zygote in device's init.rc to unblock zygote start. on zygote-start && property:ro.crypto.state=unencrypted # A/B update verifier that marks a successful boot. exec_start update_verifier_nonencrypted start statsd start netd start zygote //【--- 5.1 -->】 start zygote_secondary //【--- 5.2 -->】 on zygote-start && property:ro.crypto.state=unsupported # A/B update verifier that marks a successful boot. exec_start update_verifier_nonencrypted start statsd start netd start zygote start zygote_secondary on zygote-start && property:ro.crypto.state=encrypted && property:ro.crypto.type=file # A/B update verifier that marks a successful boot. exec_start update_verifier_nonencrypted start statsd start netd start zygote start zygote_secondary |
5.service zygote
Android 5.0以后，Android开始支持64位编译。
init.rc头部引入了带有“关键字”的其它rc：“import /system/etc/init/hw/init.${ro.zygote}.rc”，但是在aosp源码的这个目录下并没有相关文件。和init.rc同目录下却有这么几个：
system/core/rootdir/init.zygote32.rc --------- > 对应32位处理器。没有“service zygote_secondary”
system/core/rootdir/init.zygote32_64.rc ---- > 32位为主，64位为辅（如果product的cpu是32位，顺便支持64位app？）。有
system/core/rootdir/init.zygote64.rc --------- > 64位处理器，没有“service zygote_secondary”
system/core/rootdir/init.zygote64_32.rc ---- > 64位为主，32位为辅。有
以MiNote3+lineageos18.1为例，对应文件的目录：
看一下init.zygote64_32.rc的内容：
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service zygote /system/bin/app_process64 -Xzygote /system/bin --zygote --start-system-server --socket-name=zygote class main priority -20 user root group root readproc reserved_disk socket zygote stream 660 root system socket usap_pool_primary stream 660 root system onrestart exec_background - system system -- /system/bin/vdc volume abort_fuse onrestart write /sys/power/state on onrestart restart audioserver onrestart restart cameraserver onrestart restart media onrestart restart netd onrestart restart wificond task_profiles ProcessCapacityHigh MaxPerformance service zygote_secondary /system/bin/app_process32 -Xzygote /system/bin --zygote --socket-name=zygote_secondary --enable-lazy-preload class main priority -20 user root group root readproc reserved_disk socket zygote_secondary stream 660 root system socket usap_pool_secondary stream 660 root system onrestart restart zygote task_profiles ProcessCapacityHigh MaxPerformance |
可见，zygote服务的启动文件是 /system/bin/app_process64 。
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声明
本文由崔维友 威格灵 cuiweiyou vigiles cuiweiyou 原创，转载请注明出处：http://www.gaohaiyan.com/4062.html
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