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           ltrace [-CfhiLrStttV] [-a column] [-A maxelts] [-D level] [-e expr] [-l
           filename] [-n nr] [-o filename] [-p pid] ... [-s strsize] [-u username]
           [-X  extern] [-x extern] ... [--align=column] [--debug=level] [--deman-
           gle] [--help]  [--indent=nr]  [--library=filename]  [--output=filename]
           [--version] [command [arg ...]]


           ltrace  is  a  program  that simply runs the specified command until it
           exits.  It intercepts and records the dynamic library calls  which  are
           called  by  the  executed process and the signals which are received by
           that process.  It can also intercept and print the  system  calls  exe-
           cuted by the program.
           Its use is very similar to strace(1).


           -a, --align column
                  Align  return values in a specific column (default column is 5/8
                  of screen width).
           -A maxelts
                  Maximum number of array elements to print before suppressing the
                  rest with an ellipsis ("...")
           -c     Count  time and calls for each library call and report a summary
                  on program exit.
           -C, --demangle
                  Decode (demangle) low-level symbol names into user-level  names.
                  Besides  removing any initial underscore prefix used by the sys-
                  tem, this makes C++ function names readable.
           -D, --debug level
                  Show debugging output of ltrace itself.  level must be a sum  of
                  some of the following numbers:
                  01     DEBUG_GENERAL.  Shows helpful progress information
                  010    DEBUG_EVENT.  Shows every event received by a traced pro-
                  020    DEBUG_PROCESS.  Shows every action ltrace carries upon  a
                         traced process
                  040    DEBUG_FUNCTION.  Shows every entry to internal functions
           -e expr
                  A  qualifying  expression  which modifies which events to trace.
           -F     Load  an  alternate  config file. Normally, /etc/ltrace.conf and
                  ~/.ltrace.conf will be read (the latter only if it exists).  Use
                  this option to load the given file or files instead of those two
                  default files.
           -h, --help
                  Show a summary of the options to ltrace and exit.
           -i     Print the instruction pointer at the time of the library call.
           -l, --library filename
                  Display only the symbols included in the library  filename.   Up
                  to  30  library names can be specified with several instances of
                  this option.
           -L     DON'T display library calls (use it with the -S option).
           -n, --indent nr
                  Indent trace output by nr number of spaces for each  new  nested
                  call.  Using  this  option  makes the program flow visualization
                  easy to follow.
           -o, --output filename
                  Write the trace output to  the  file  filename  rather  than  to
           -p pid Attach to the process with the process ID pid and begin tracing.
           -r     Print a relative timestamp with each line of  the  trace.   This
                  records  the time difference between the beginning of successive
           -s strsize
                  Specify the maximum string size to print (the default is 32).
           -S     Display system calls as well as library calls
           -t     Prefix each line of the trace with the time of day.
           -tt    If given twice, the time printed will include the  microseconds.
           -ttt   If  given thrice, the time printed will include the microseconds
                  and the leading portion will be printed as the number of seconds
                  since the epoch.
           -T     Show   the   time  spent inside each call. This records the time
                  difference between the beginning and the end of each call.
           -u username
                  Run command with the userid, groupid and supplementary groups of
                  username.   This  option is only useful when running as root and
                  Show the version number of ltrace and exit.


           It has most of the bugs stated in strace(1).
           Manual page and documentation are not very up-to-date.
           Option -f sometimes fails to trace some children.
           It only works on Linux and in a small subset of architectures.
           Only ELF32 binaries are supported.
           Calls to dlopen()ed libraries will not be traced.
           If you would like to report a bug, send a message to the  mailing  list
           (, or use the reportbug(1) program
           if you are under the Debian GNU/Linux distribution.


                  System configuration file
                  Personal config file, overrides /etc/ltrace.conf


           Juan Cespedes <>


           strace(1), ptrace(2)

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