Unix in a Nutshell, 4th Edition

Name

ltrace

Synopsis

    ltrace [options] command [arguments]

Trace the dynamic library calls for command and arguments. ltrace can also trace and print the system calls. It is very similar to strace (see also strace).

Options

-a n

Align the return values in column n.

-c

Count all calls and signals and create a summary report when the program has ended.

-C, --demangle

Demangle C++ encoded names.

-d, --debug

Debug mode. Print debugging information for ltrace on standard error.

-e[keyword=][!]values

Pass an expression to ltrace to limit the types of calls or signals that are traced or to change how they are displayed. See strace for the full list.

-f

Trace forked processes.

-h, --help

Print help and exit.

-i

Print instruction pointer with each system call.

-lfile, --libraryfile

Print only the symbols from library file. Up to 20 files may be specified.

-L

Do not display library calls. Use together with -S.

-ncount, --indentcount

Indent trace output by count spaces for each new nested function call.

-ofilename, --outputfilename

Write output to filename instead of standard error. If filename starts with the pipe symbol |, treat the rest of the name as a command to which output should be piped.

-p pid

Attach to the given process ID and begin tracking. ltrace can track more than one process if more than one -p option is given. Type CTRL-C to end the trace.

-r

Relative timestamp. Print time in microseconds between system calls.

-s n

Print only the first n characters of a string. Default value is 32.

-S

Display ...