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29.2. strace - trace system calls and signals

-tt  在每行輸出的前面,顯示毫秒級別的時間
-T   顯示每次系統調用所花費的時間
-v   對於某些相關調用,把完整的環境變數,檔案stat結構等打出來.
-f   跟蹤目標進程,以及目標進程創建的所有子進程.
-e  控制要跟蹤的事件和跟蹤行為,比如指定要跟蹤的系統調用名稱.
     trace=file     跟蹤和檔案訪問相關的調用(參數中有檔案名)
     trace=process  和進程管理相關的調用,比如fork/exec/exit_group
      trace=network  和網絡通信相關的調用,比如socket/sendto/connect
      trace=signal    信號發送和處理相關,比如kill/sigaction
      trace=desc  和檔案描述符相關,比如write/read/select/epoll等    
      trace=ipc 進程見通信相關,比如shmget等
      
-o  把strace的輸出單獨寫到指定的檔案
-s  當系統調用的某個參數是字元串時,最多輸出指定長度的內容,預設是32個位元組.
-p  指定要跟蹤的進程pid,要同時跟蹤多個pid,重複多次-p選項即可.		
		
strace -tt -T -v -f -e trace=file -o ~/strace.log.2 -s 1024 -p  25849		
		

strace -v ps -e 2

strace -v ls

neo@netkiller:~/workspace/Document$ strace -c ls
Docbook  makedoc  Tex
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
  -nan    0.000000           0        11           read
  -nan    0.000000           0         1           write
  -nan    0.000000           0        38        13 open
  -nan    0.000000           0        27           close
  -nan    0.000000           0        25           fstat
  -nan    0.000000           0        39           mmap
  -nan    0.000000           0        16           mprotect
  -nan    0.000000           0         4           munmap
  -nan    0.000000           0         3           brk
  -nan    0.000000           0         2           rt_sigaction
  -nan    0.000000           0         1           rt_sigprocmask
  -nan    0.000000           0         2           ioctl
  -nan    0.000000           0         9         9 access
  -nan    0.000000           0         1           execve
  -nan    0.000000           0         1           fcntl
  -nan    0.000000           0         2           getdents
  -nan    0.000000           0         1           getrlimit
  -nan    0.000000           0         1           statfs
  -nan    0.000000           0         1           arch_prctl
  -nan    0.000000           0         3         1 futex
  -nan    0.000000           0         1           set_tid_address
  -nan    0.000000           0         1           set_robust_list
------ ----------- ----------- --------- --------- ----------------
100.00    0.000000                   190        23 total
			
neo@netkiller:~/workspace/Document$ strace -f -e open ls >/dev/null
open("/etc/ld.so.cache", O_RDONLY)      = 3
open("/lib/librt.so.1", O_RDONLY)       = 3
open("/lib/libselinux.so.1", O_RDONLY)  = 3
open("/lib/libacl.so.1", O_RDONLY)      = 3
open("/lib/libc.so.6", O_RDONLY)        = 3
open("/lib/libpthread.so.0", O_RDONLY)  = 3
open("/lib/libdl.so.2", O_RDONLY)       = 3
open("/lib/libattr.so.1", O_RDONLY)     = 3
open("/proc/filesystems", O_RDONLY)     = 3
open("/usr/lib/locale/locale-archive", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/locale.alias", O_RDONLY) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_IDENTIFICATION", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_IDENTIFICATION", O_RDONLY) = 3
open("/usr/lib/gconv/gconv-modules.cache", O_RDONLY) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_MEASUREMENT", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_MEASUREMENT", O_RDONLY) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_TELEPHONE", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_TELEPHONE", O_RDONLY) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_ADDRESS", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_ADDRESS", O_RDONLY) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_NAME", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_NAME", O_RDONLY) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_PAPER", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_PAPER", O_RDONLY) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_MESSAGES", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_MESSAGES", O_RDONLY) = 3
open("/usr/lib/locale/en_US.utf8/LC_MESSAGES/SYS_LC_MESSAGES", O_RDONLY) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_MONETARY", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_MONETARY", O_RDONLY) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_COLLATE", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_COLLATE", O_RDONLY) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_TIME", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_TIME", O_RDONLY) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_NUMERIC", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_NUMERIC", O_RDONLY) = 3
open("/usr/lib/locale/en_US.UTF-8/LC_CTYPE", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_CTYPE", O_RDONLY) = 3
open(".", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
		

29.2.1. -o file -- send trace output to FILE instead of stderr

$ strace -o strace.log php --version
$ grep php.ini strace.log