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<noinclude>
{{ArticleBasedOnModel | [[Trace and debug tools article model]]}}
{{ArticleMainWriter | Jean-PhilippeR}}
{{ArticleApprovedVersion | Jean-PhilippeR | Jean-PhilippeR, Jean-ChristopheT | Jean-PhilippeR - 14Sept'18 | PhilipS - 07Dec'18 - 9773 | 10Dec'18}}
[[Category:Linux tracing tools]]
</noinclude>
== Article purpose ==
== Article purpose ==
This article provides the basic information needed to start using the Linux tool: '''ltrace'''<ref name=ltracedotorg/>.
This article provides the basic information needed to start using the Linux tool: '''ltrace'''<ref name=ltracedotorg/>.
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''Its use is very similar to [[Strace|strace]]''.
''Its use is very similar to [[Strace|strace]]''.
  | {{N}} || {{N}} || {{Y}}
  | {{N}} || {{N}} || {{Y}}
  | colspan="3" | {{UnderConstruction}}
  | {{N}} || {{N}} || {{N}}
  |-
  |-
</onlyinclude>
</onlyinclude>
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These steps are described below:
These steps are described below:
* Create an area to store the ltrace libs and binaries that are to be compiled for your target board:
* Create an area to store the ltrace libs and binaries that are to be compiled for your target board:
  {{PC$}} cd {{orange|<''your_local_dir''>}}
  {{PC$}} cd <''your_local_dir''>
  {{PC$}} mkdir ltrace_target
  {{PC$}} mkdir ltrace_target


* Get the application source code:
* Get the application source code:
  {{PC$}} cd ltrace_target
  {{PC$}} cd ltrace_target
  {{PC$}} wget https://www.ltrace.org/ltrace_{{orange|<''latest_ltrace_version''>}}.orig.tar.bz2 && tar xvf ltrace_{{orange|<''latest_ltrace_version''>}}.orig.tar.bz2 && cd ltrace-{{orange|<''latest_ltrace_version''>}}
  {{PC$}} wget https://www.ltrace.org/ltrace_<''latest_ltrace_version''>.orig.tar.bz2 && tar xvf ltrace_<''latest_ltrace_version''>.orig.tar.bz2 && cd ltrace-<''latest_ltrace_version''>
   
   
  Example with ltrace version 0.7.3:
  Example with ltrace version 0.7.3:
  {{PC$}}wget https://www.ltrace.org/ltrace_0.7.3.orig.tar.bz2 && tar xvf ltrace_0.7.3.orig.tar.bz2 && cd ltrace-0.7.3
  {{PC$}} wget https://www.ltrace.org/ltrace_0.7.3.orig.tar.bz2 && tar xvf ltrace_0.7.3.orig.tar.bz2 && cd ltrace-0.7.3


* Install and set up a cross compilation environment using SDK: See [[Cross-compile with OpenSTLinux SDK#Adding Linux user space applications|Cross-compile Linux user space application with OpenSTLinux SDK]]
* Install and set up a cross compilation environment using SDK: See [[Cross-compile with OpenSTLinux SDK#Adding Linux user space applications|Cross-compile Linux user space application with OpenSTLinux SDK]]
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* Install the binary file on the target using network link:
* Install the binary file on the target using network link:
  {{PC$}} scp ltrace root@{{orange|<''ip_of_board''>}}:/usr/bin/
  {{PC$}} scp ltrace root@<''ip_of_board''>:/usr/bin/
}}
}}


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To include '''ltrace''' in your Distribution Package image build, please follow steps below:
To include '''ltrace''' in your Distribution Package image build, please follow steps below:
* Add ltrace package for the image building
* Add ltrace package for the image building
  {{PC$}} cd {{Orange|<''your_Distribution_Package_root_dir''>}}
  {{PC$}} cd {{HighlightParam|''<your_Distribution_Package_root_dir>''}}
  {{PC$}} echo 'IMAGE_INSTALL_append += "ltrace"' >> meta-st/meta-st-openstlinux/recipes-st/images/st-image-weston.bbappend
  {{PC$}} echo 'IMAGE_INSTALL_append += "ltrace"' >> layers/meta-st/meta-st-openstlinux/recipes-st/images/st-image-weston.bbappend


* Rebuild your full image
* Rebuild your full image
  {{PC$}} bitbake {{Orange|<''full_image_name''>}} # Needed to include ltrace into the final image rootfs
  {{PC$}} bitbake {{HighlightParam|''<full_image_name>''}} # Needed to include ltrace into the final image rootfs


* Reload the new image on your board: see [[STM32MP1 Distribution Package#Flashing the built image|Flashing the built image]] <br>
* Reload the new image on your board: see [[STM32MP1 Distribution Package#Flashing the built image|Flashing the built image]] <br>
=== Using the STM32MPU Embedded Software distribution for Android&trade; ===
{{UnderConstruction}}


== Getting started ==
== Getting started ==
To use '''ltrace''', there are two main methods:
To use '''ltrace''', there are two main methods:
* by giving, as parameter, the name of program for which you want to list dynamic library calls, and its arguments if required:
* by giving, as parameter, the name of program for which you want to list dynamic library calls, and its arguments if required:
  {{Board$}} ltrace {{orange|<''Program''> [''ARGS'']}}
  {{Board$}} ltrace {{HighlightParam|''<Program>'' [''ARGS'']}}
:As example:
:As example:
  {{Board$}} ltrace weston-simple-egl
  {{Board$}} ltrace weston-simple-egl
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* by giving, as parameter, the PID of the process to be studied:
* by giving, as parameter, the PID of the process to be studied:
  {{Board$}} ltrace -p {{orange|<''PID''>}}
  {{Board$}} ltrace -p {{HighlightParam|''<PID>''}}
{{highlight|Note: {{orange|<''PID''>}} value can be replace by {{orange|''`pidof <process_name>`''}}}}
{{highlight|Note: {{HighlightParam|''<PID>''}} value can be replace by {{HighlightParam|''`pidof <process_name>`''}}}}
:As example:
:As example:
  {{Board$}} weston-simple-egl & ltrace -p `pidof weston-simple-egl`
  {{Board$}} weston-simple-egl & ltrace -p `pidof weston-simple-egl`
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| ellexus.com
| ellexus.com
|}
|}
{{ ArticleBasedOnModel | Trace and debug tools article model }}
{{ PublicationRequestId | 9773 | 07Dec'18 }}
[[Category:Linux tracing tools]]

Latest revision as of 11:13, 8 August 2019↑

1. Article purpose[edit source]↑

This article provides the basic information needed to start using the Linux tool: ltrace[1].

2. Introduction[edit source]↑

The following table provides a brief description of the tool, as well as its availability depending on the software packages:

Template:Y: this tool is either present (ready to use or to be activated), or can be integrated and activated on the software package.

Template:N: this tool is not present and cannot be integrated, or it is present but cannot be activated on the software package.


Tool STM32MPU Embedded Software distribution STM32MPU Embedded Software distribution for Android™
Name Category Purpose Starter Package Developer Package Distribution Package Starter Package Developer Package Distribution Package
ltrace Tracing tools ltrace[1] is used to display the calls to shared libraries made by a userspace application. ltrace is a userspace application.

Its use is very similar to strace.

Template:N Template:N Template:Y Template:N Template:N Template:N

3. Installing the trace and debug tool on your target board[edit source]↑

3.1. Using the STM32MPU Embedded Software distribution[edit source]↑

Template:Highlight

Template:InternalInfo

3.1.1. Distribution Package[edit source]↑

To include ltrace in your Distribution Package image build, please follow steps below:

  • Add ltrace package for the image building
Template:PC$ cd <your_Distribution_Package_root_dir>
Template:PC$ echo 'IMAGE_INSTALL_append += "ltrace"' >> layers/meta-st/meta-st-openstlinux/recipes-st/images/st-image-weston.bbappend
  • Rebuild your full image
Template:PC$ bitbake <full_image_name> # Needed to include ltrace into the final image rootfs

4. Getting started[edit source]↑

To use ltrace, there are two main methods:

  • by giving, as parameter, the name of program for which you want to list dynamic library calls, and its arguments if required:
Template:Board$ ltrace <Program> [ARGS]
As example:
Template:Board$ ltrace weston-simple-egl
__libc_start_main(0x11a90, 1, 0xbec45d04, 0x131f0 <unfinished ...>
memset(0xbec456f8, 0, 72, 0x11a90)                                             = 0xbec456f8
memset(0xbec45754, 0, 68, 0xbec45740)                                          = 0xbec45754
wl_display_connect(0, 250, 32, 0xbec45750)                                     = 0x26150
wl_proxy_marshal_constructor(0x26150, 1, 0x24e90, 0)                           = 0x2a268
wl_proxy_add_listener(0x2a268, 0x132e0, 0xbec456f8, 0)                         = 0
wl_display_roundtrip(0x26150, 0x132e0, 0xbec456f8, 0 <unfinished ...>
strcmp(0x2a404, 0x133e8, 1, 0x2a404)                                           = 0
wl_proxy_marshal_constructor_versioned(0x2a268, 0, 0x24ed8, 1)                 = 0x2b070
strcmp(0x2a49c, 0x133e8, 2, 0x2a49c)                                           = 16
strcmp(0x2a49c, 0x133f8, 115, 0x635f6c77)                                      = -3
...
  • by giving, as parameter, the PID of the process to be studied:
Template:Board$ ltrace -p <PID>

Template:Highlight

As example:
Template:Board$ weston-simple-egl & ltrace -p `pidof weston-simple-egl`
has EGL_EXT_buffer_age and EGL_EXT_swap_buffers_with_damage
glGetShaderiv(1, 0x8b81, 0xbee14260, 0)                                        = 0
glCreateShader(0x8b31, 0x8b31, 256, 1)                                         = 2
glShaderSource(2, 1, 0xbee1425c, 0)                                            = 0x1a96f0
glCompileShader(2, 0, 154, 0xbee14260)                                         = 1
glGetShaderiv(2, 0x8b81, 0xbee14260, 0)                                        = 0
glCreateProgram(2, 2, 256, 1)                                                  = 3
glAttachShader(3, 1, -1, 1)                                                    = 0
glAttachShader(3, 2, 0x8b30, 1)                                                = 0
glLinkProgram(3, 0x8dd9, 0x8b31, 1)                                            = 0x285234
glGetProgramiv(3, 0x8b82, 0xbee14698, 0)                                       = 0
glUseProgram(3, 3, 256, 1)                                                     = 1
glBindAttribLocation(3, 0, 0x13884, 1)                                         = 1
glBindAttribLocation(3, 1, 0x13888, 0)                                         = 1
glLinkProgram(3, 0x1388e, 0, 0x1b9090)                                         = 1
...

Template:Board$ killall weston-simple-egl

5. To go further[edit source]↑

Other options can be set. For details, please refer to the manual page[2].

6. References[edit source]↑

  1. ↑ Jump up to: 1.0 1.1 https://www.ltrace.org/
  2. ↑ http://man7.org/linux/man-pages/man1/ltrace.1.html


  • Useful external links
Document link Document Type Description
ltrace linux.die.net Standard linux.die.net
ltrace wikipedia.org Standard wikipedia.org
ltrace tutorial User Guide go4expert.com
ltrace training


Training ellexus.com

Template:ArticleBasedOnModel

Linux® is a registered trademark of Linus Torvalds.

Khronos Native Platform Graphics Interface (See http://www.khronos.org/egl/ for more details)

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