ltrace 命令

常用示例

说明

ltrace intercepts and records dynamic library calls made by a process and signals received by it. It is useful for debugging and understanding how programs interact with shared libraries.

参数

-a, --align _column_

Align return values in a specific column (default is 5/8 of screen width).

-A _maxelts_

Maximum number of array elements to print before suppressing the rest with an ellipsis.

-b, --no-signals

Disable printing of signals received by the traced process.

-c

Count time and calls for each library call and print a summary on program exit.

-C, --demangle

Decode (demangle) low-level C++ symbol names into user-level names.

-D, --debug _mask_

Show debugging output of ltrace itself.

-e _filter_

Qualifying expression to select which library calls to trace.

-f

Trace child processes created by fork(2) or clone(2).

-F, --config _pathlist_

Colon-separated list of paths for prototype library configuration files.

-i

Print the instruction pointer at the time of the library call.

-l, --library _library_pattern_

Display only calls to functions in libraries matching the pattern.

-L

Don't display library calls (use with -x to trace only symbol entry points).

-n, --indent _nr_

Indent trace output by nr spaces for each nested call level.

-o, --output _filename_

Write trace output to a file instead of stderr.

-p _pid_

Attach to the process with the given process ID.

-r

Print a relative timestamp with each line of the trace.

-s _strsize_

Maximum string size to print (default: 32).

-S

Display system calls as well as library calls.

-t

Prefix each line with the time of day.

-tt

Time of day with microseconds.

-ttt

Microseconds since the epoch.

-T

Show the time spent inside each call.

-u _username_

Run command with the userid and groupid of the specified user.

-w, --where _nr_

Show backtrace of nr stack frames for each traced function.