[AOS] 안드로이드 단말기에서 strace 사용하기

- strace란 ? 

시스템 콜 함수들과 시그널 처리에 대해 트레이스 할 수 있는 명령어.

프로세스에서 생성하는 시스템 호출, 그리고 이러한 시스템 호출이 무엇을 반환하는지 확인할 수 있게 해줍니다.

 

 

strace 바이너리 다운로드는 아래 

  다운로드 : https://github.com/andrew-d/static-binaries/tree/master/binaries/linux/arm

GitHub - andrew-d/static-binaries: Various *nix tools built as statically-linked binaries

 

설치 시작!

1. github에서 다운받은 strace 바이너리를 단말기에 넣어준다!

2. adb로 접속 후 strace 권한을 777로 변경해준다.

3. 명령어 ./strace -p [attach할 pid] -v -s [strsize] -o [file경로] 실행 후 attach한 앱 종료

**앱을 완전히 종료시켜주면 attach가 종료된다.

 

 

4. 생성된 결과파일을 오픈해보면

짠!

[☆strace 옵션★]

usage: strace [-CdffhiqrtttTvVxxy] [-I n] [-e expr]...
              [-a column] [-o file] [-s strsize] [-P path]...
              -p pid... / [-D] [-E var=val]... [-u username] PROG [ARGS]
   or: strace -c[df] [-I n] [-e expr]... [-O overhead] [-S sortby]
              -p pid... / [-D] [-E var=val]... [-u username] PROG [ARGS]
-c -- count time, calls, and errors for each syscall and report summary
-C -- like -c but also print regular output
-w -- summarise syscall latency (default is system time)
-d -- enable debug output to stderr
-D -- run tracer process as a detached grandchild, not as parent
-f -- follow forks, -ff -- with output into separate files
-i -- print instruction pointer at time of syscall
-q -- suppress messages about attaching, detaching, etc.
-r -- print relative timestamp, -t -- absolute timestamp, -tt -- with usecs
-T -- print time spent in each syscall
-v -- verbose mode: print unabbreviated argv, stat, termios, etc. args
-x -- print non-ascii strings in hex, -xx -- print all strings in hex
-y -- print paths associated with file descriptor arguments
-yy -- print ip:port pairs associated with socket file descriptors
-h -- print help message, -V -- print version
-a column -- alignment COLUMN for printing syscall results (default 40)
-b execve -- detach on this syscall
-e expr -- a qualifying expression: option=[!]all or option=[!]val1[,val2]...
   options: trace, abbrev, verbose, raw, signal, read, write
-I interruptible --
   1: no signals are blocked
   2: fatal signals are blocked while decoding syscall (default)
   3: fatal signals are always blocked (default if '-o FILE PROG')
   4: fatal signals and SIGTSTP (^Z) are always blocked
      (useful to make 'strace -o FILE PROG' not stop on ^Z)
-o file -- send trace output to FILE instead of stderr
-O overhead -- set overhead for tracing syscalls to OVERHEAD usecs
-p pid -- trace process with process id PID, may be repeated
-s strsize -- limit length of print strings to STRSIZE chars (default 32)
-S sortby -- sort syscall counts by: time, calls, name, nothing (default time)
-u username -- run command as username handling setuid and/or setgid
-E var=val -- put var=val in the environment for command
-E var -- remove var from the environment for command
-P path -- trace accesses to path

참고 : https://source.android.com/docs/core/tests/debug/strace?hl=ko 

strace 사용  |  Android 오픈소스 프로젝트  |  Android Open Source Project