會這樣寫是因為這是在 shell run 的程式，沒有用 Dalvik.
是要看看 android linux 的 bionic , share library
用偷懶的方法，拿 system/extra/sound 來參考 (copy)
- 在 system/extra 下 create "myhello" folder
- copy sound 的 Android.mk 過來
- 修改 Android.mk
- mm
build log:
make: Entering directory `/home/checko/myandroid8.1'
target thumb C: myhello <= system/extras/myhello/myhello.c
target Executable: myhello (out/target/product/myBBG/obj/EXECUTABLES/myhello_intermediates/LINKED/myhello)
target Non-prelinked: myhello (out/target/product/myBBG/symbols/system/bin/myhello)
target Strip: myhello (out/target/product/myBBG/obj/EXECUTABLES/myhello_intermediates/myhello)
Install: out/target/product/myBBG/system/bin/myhello
Copy: out/target/product/myBBG/system/etc/apns-conf.xml
make: Leaving directory `/home/checko/myandroid8.1'
在 croot (android project root)，用 make showcommands myhello 的 log:
build/core/copy_headers.mk:15: warning: overriding commands for target `out/target/product/myBBG/obj/include/libpv/getactualaacconfig.h'
build/core/copy_headers.mk:15: warning: ignoring old commands for target `out/target/product/myBBG/obj/include/libpv/getactualaacconfig.h'
/bin/bash: line 0: cd: sdk/layoutopt/app/src/resources: No such file or directory
No private recovery resources for TARGET_DEVICE myBBG
target thumb C: myhello <= system/extras/myhello/myhello.c
prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/arm-eabi-gcc -I system/core/include -I hardware/libhardware/include
-I hardware/libhardware_legacy/include -I hardware/ril/include -I dalvik/libnativehelper/include -I frameworks/base/include
-I frameworks/base/opengl/include -I external/skia/include -I out/target/product/myBBG/obj/include
-I bionic/libc/arch-arm/include -I bionic/libc/include -I bionic/libstdc++/include -I bionic/libc/kernel/common
-I bionic/libc/kernel/arch-arm -I bionic/libm/include -I bionic/libm/include/arch/arm -I bionic/libthread_db/include
-I system/extras/myhello -I out/target/product/myBBG/obj/EXECUTABLES/myhello_intermediates
-I out/target/product/myBBG/obj/STATIC_LIBRARIES/libwebcore_intermediates -c -fno-exceptions -Wno-multichar
-msoft-float -fpic -ffunction-sections -funwind-tables -fstack-protector -fno-short-enums -march=armv5te
-mtune=xscale -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__
-include system/core/include/arch/linux-arm/AndroidConfig.h -I system/core/include/arch/linux-arm/ -mthumb-interwork
-DANDROID -fmessage-length=0 -W -Wall -Wno-unused -Winit-self -Wpointer-arith -Werror=return-type -Werror=non-virtual-dtor
-Werror=address -Werror=sequence-point -DSK_RELEASE -DNDEBUG -g -Wstrict-aliasing=2 -finline-functions
-fno-inline-functions-called-once -fgcse-after-reload -frerun-cse-after-loop -frename-registers -DNDEBUG -UDEBUG -mthumb
-Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64
-MD -o out/target/product/myBBG/obj/EXECUTABLES/myhello_intermediates/myhello.o system/extras/myhello/myhello.c
Install: out/host/linux-x86/bin/apriori
out/host/linux-x86/bin/acp -fpt out/host/linux-x86/obj/EXECUTABLES/apriori_intermediates/apriori out/host/linux-x86/bin/apriori
Install: out/host/linux-x86/bin/soslim
out/host/linux-x86/bin/acp -fpt out/host/linux-x86/obj/EXECUTABLES/soslim_intermediates/soslim out/host/linux-x86/bin/soslim
target Executable: myhello (out/target/product/myBBG/obj/EXECUTABLES/myhello_intermediates/LINKED/myhello)
prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/arm-eabi-g++ -nostdlib -Bdynamic -Wl,-T,build/core/armelf.x
-Wl,-dynamic-linker,/system/bin/linker -Wl,--gc-sections -Wl,-z,nocopyreloc
-o out/target/product/myBBG/obj/EXECUTABLES/myhello_intermediates/LINKED/myhello -Lout/target/product/myBBG/obj/lib
-Wl,-rpath-link=out/target/product/myBBG/obj/lib -lc -lstdc++ -lm out/target/product/myBBG/obj/lib/crtbegin_dynamic.o
out/target/product/myBBG/obj/EXECUTABLES/myhello_intermediates/myhello.o -Wl,--no-undefined
/home/checko/myandroid8.1/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/../lib/gcc/arm-eabi/4.4.0/interwork/libgcc.a
out/target/product/myBBG/obj/lib/crtend_android.o
target Non-prelinked: myhello (out/target/product/myBBG/symbols/system/bin/myhello)
out/host/linux-x86/bin/acp -fpt out/target/product/myBBG/obj/EXECUTABLES/myhello_intermediates/LINKED/myhello
out/target/product/myBBG/symbols/system/bin/myhello
target Strip: myhello (out/target/product/myBBG/obj/EXECUTABLES/myhello_intermediates/myhello)
out/host/linux-x86/bin/soslim --strip --shady --quiet out/target/product/myBBG/symbols/system/bin/myhello
--outfile out/target/product/myBBG/obj/EXECUTABLES/myhello_intermediates/myhello
Install: out/target/product/myBBG/system/lib/libdl.so
out/host/linux-x86/bin/acp -fpt out/target/product/myBBG/obj/lib/libdl.so out/target/product/myBBG/system/lib/libdl.so
Install: out/target/product/myBBG/system/lib/libc.so
out/host/linux-x86/bin/acp -fpt out/target/product/myBBG/obj/lib/libc.so out/target/product/myBBG/system/lib/libc.so
Install: out/target/product/myBBG/system/lib/libstdc++.so
out/host/linux-x86/bin/acp -fpt out/target/product/myBBG/obj/lib/libstdc++.so out/target/product/myBBG/system/lib/libstdc++.so
Install: out/target/product/myBBG/system/lib/libm.so
out/host/linux-x86/bin/acp -fpt out/target/product/myBBG/obj/lib/libm.so out/target/product/myBBG/system/lib/libm.so
Install: out/target/product/myBBG/system/bin/myhello
out/host/linux-x86/bin/acp -fpt out/target/product/myBBG/obj/EXECUTABLES/myhello_intermediates/myhello
out/target/product/myBBG/system/bin/myhello
這樣build 出來的 myhello 會被 install 在 system/bin 中，boot 後直接 invoke 就可以執行。
啟動 strace myhello 的內容：
strace myhello
execve("/system/bin/myhello", ["myhello"], [/* 19 vars */]) = 0
syscall_983045(0xb0017900, 0xbed6dbb4, 0, 0x847c, 0xb000f448, 0xbed6dbb0, 0x8, 0xf0005, 0, 0, 0, 0, 0, 0xbed6db58, 0xb000194b, 0xb000228c, 0x80000010, 0xb0017900, 0, 0, 0xc764, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) = 0
getpid() = 2109
sigaction(SIGILL, {0xb0001d45, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGABRT, {0xb0001d45, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGBUS, {0xb0001d45, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGFPE, {0xb0001d45, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGSEGV, {0xb0001d45, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGSTKFLT, {0xb0001d45, [], SA_RESTART}, {SIG_DFL}, 0) = 0
sigaction(SIGPIPE, {0xb0001d45, [], SA_RESTART}, {SIG_DFL}, 0) = 0
getuid32() = 0
geteuid32() = 0
getgid32() = 0
getegid32() = 0
stat64("/system/lib/libc.so", {st_mode=S_IFREG|0644, st_size=239972, ...}) = 0
open("/system/lib/libc.so", O_RDONLY|O_LARGEFILE) = 3
lseek(3, 0, SEEK_SET) = 0
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0 \250\0\000"..., 4096) = 4096
lseek(3, -8, SEEK_END) = 239964
read(3, "\0\0\340\257PRE ", 8) = 8
mmap2(0xafe00000, 286720, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xafe00000
mmap2(0xafe00000, 228532, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xafe00000
mprotect(0xafe00000, 229376, PROT_READ|PROT_WRITE|PROT_EXEC) = 0
mmap2(0xafe38000, 8596, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x38) = 0xafe38000
mmap2(0xafe3b000, 42160, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xafe3b000
close(3) = 0
mprotect(0xafe00000, 229376, PROT_READ|PROT_EXEC) = 0
getuid32() = 0
geteuid32() = 0
getgid32() = 0
getegid32() = 0
gettid() = 2109
syscall_983045(0xafe42ad4, 0xafe42a98, 0, 0x40, 0xafe38e08, 0xbed6dbb0, 0xbed6da58, 0xf0005, 0, 0, 0, 0, 0, 0xbed6da48, 0xafe1f721, 0xafe0d89c, 0x60000010, 0xafe42ad4, 0, 0, 0xc764, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) = 0
mmap2(NULL, 32768, PROT_READ, MAP_SHARED, 9, 0) = 0x40000000
open("/dev/urandom", O_RDONLY|O_LARGEFILE) = 3
read(3, "\223\31\234=", 4) = 4
close(3) = 0
stat64("/system/lib/libstdc++.so", {st_mode=S_IFREG|0644, st_size=5268, ...}) = 0
open("/system/lib/libstdc++.so", O_RDONLY|O_LARGEFILE) = 3
lseek(3, 0, SEEK_SET) = 0
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0X\10\0\000"..., 4096) = 4096
lseek(3, -8, SEEK_END) = 5260
read(3, "\0\0\320\257PRE ", 8) = 8
mmap2(0xafd00000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xafd00000
mmap2(0xafd00000, 2848, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xafd00000
mprotect(0xafd00000, 4096, PROT_READ|PROT_WRITE|PROT_EXEC) = 0
mmap2(0xafd01000, 232, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x1) = 0xafd01000
close(3) = 0
mprotect(0xafd00000, 4096, PROT_READ|PROT_EXEC) = 0
getuid32() = 0
geteuid32() = 0
getgid32() = 0
getegid32() = 0
stat64("/system/lib/libm.so", {st_mode=S_IFREG|0644, st_size=132116, ...}) = 0
open("/system/lib/libm.so", O_RDONLY|O_LARGEFILE) = 3
lseek(3, 0, SEEK_SET) = 0
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0@ \0\000"..., 4096) = 4096
lseek(3, -8, SEEK_END) = 132108
read(3, "\0\0\300\257PRE ", 8) = 8
mmap2(0xafc00000, 135168, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xafc00000
mmap2(0xafc00000, 129828, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xafc00000
mprotect(0xafc00000, 131072, PROT_READ|PROT_WRITE|PROT_EXEC) = 0
mmap2(0xafc20000, 280, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x20) = 0xafc20000
close(3) = 0
mprotect(0xafc00000, 131072, PROT_READ|PROT_EXEC) = 0
getuid32() = 0
geteuid32() = 0
getgid32() = 0
getegid32() = 0
mprotect(0x8000, 4096, PROT_READ|PROT_EXEC) = 0
getuid32() = 0
geteuid32() = 0
getgid32() = 0
getegid32() = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40008000
mprotect(0x40008000, 4096, PROT_READ) = 0
fstat64(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(207, 16), ...}) = 0
brk(0) = 0xa000
brk(0xa000) = 0xa000
brk(0xc000) = 0xc000
mprotect(0x40008000, 4096, PROT_READ|PROT_WRITE) = 0
mprotect(0x40008000, 4096, PROT_READ) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B115200 opost isig icanon echo ...}) = 0
write(1, "Hello Bionic\n", 13Hello Bionic
) = 13
mprotect(0x40008000, 4096, PROT_READ|PROT_WRITE) = 0
mprotect(0x40008000, 4096, PROT_READ) = 0
munmap(0x40008000, 4096) = 0
exit_group(0) = ?
Process 2109 detached
所以確認 share library path 是 OK 的 :(
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