ltrace メモ

ライブラリ関数のトレースツール ltrace の雑多メモ

バージョン & usage

root@choco002:~# ltrace --version
ltrace 0.7.91
Copyright (C) 2010-2013 Petr Machata, Red Hat Inc.
Copyright (C) 1997-2009 Juan Cespedes <cespedes@debian.org>.
License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

root@choco002:~# ltrace -h
Usage: ltrace [option ...] [command [arg ...]]
Trace library calls of a given program.

  -a, --align=COLUMN  align return values in a secific column.
  -A MAXELTS          maximum number of array elements to print.
  -b, --no-signals    don't print signals.
  -c                  count time and calls, and report a summary on exit.
  -C, --demangle      decode low-level symbol names into user-level names.
  -D, --debug=MASK    enable debugging (see -Dh or --debug=help).
  -Dh, --debug=help   show help on debugging.
  -e FILTER           modify which library calls to trace.
  -f                  trace children (fork() and clone()).
  -F, --config=FILE   load alternate configuration file (may be repeated).
  -h, --help          display this help and exit.
  -i                  print instruction pointer at time of library call.
  -l, --library=LIBRARY_PATTERN only trace symbols implemented by this library.
  -L                  do NOT display library calls.
  -n, --indent=NR     indent output by NR spaces for each call level nesting.
  -o, --output=FILENAME write the trace output to file with given name.
  -p PID              attach to the process with the process ID pid.
  -r                  print relative timestamps.
  -s STRSIZE          specify the maximum string size to print.
  -S                  trace system calls as well as library calls.
  -t, -tt, -ttt       print absolute timestamps.
  -T                  show the time spent inside each call.
  -u USERNAME         run command with the userid, groupid of username.
  -V, --version       output version information and exit.
  -w, --where=NR      print backtrace showing NR stack frames at most.
  -x FILTER           modify which static functions to trace.

Report bugs to ltrace-devel@lists.alioth.debian.org

実行時間を表示する

$ ltrace -p 21021 -t

特定のライブラリ関数を表示する

$ ltrace -p 21021 -e malloc

子プロセス／スレッドをトレースする方法(-f)

ltrace -p 13589 -f

統計情報を表示する方法(-c)

ltrace -p 13589 -f -c