Versioning and Task Names

Question

I have strange output from the NSH:

  nsh> sysinfo
  System Information:
      NuttX Version:    0.0 Build: 0
      System Time:    1325809119 [s] UTC
  
  nsh> ps
  PID   PRI SCHD TYPE   NP STATE    NAME
      0   0 FIFO KTHREAD   READY    <noname>()
      1  50 FIFO KTHREAD   WAITSIG  <noname>()
      2 100 FIFO TASK      RUNNING  <noname>()
   

No NAME and no version / build number

Answer

This is probably normal behavior. There are two separate, unrelated issues here.

Versioning

There are two different ways to get NuttX: (1) You can download the versioned releases at https://bitbucket.org/nuttx/nuttx/downloads, or you can (2) take un-versioned snapshots from the GIT repository at https://bitbucket.org/nuttx/nuttx/src. Since you have no version information, I am assuming that you are using a un-versioned copy.

The version number you are looking at comes from the header file file nuttx/include/nuttx/version.h. That header file was created at build time from a hidden file that you can find in the top-level nuttx directory called .version. For NuttX-7.10, that file looks like this:

  #!/bin/bash
  
  CONFIG_VERSION_STRING="7.10"
  CONFIG_VERSION_MAJOR=7
  CONFIG_VERSION_MINOR=10
  CONFIG_VERSION_BUILD="85981b37acc215ab795ef4ea4045f3e85a49a7af"

The .version file does not exist in the GIT repository; it is was added to the nuttx-7.10.tar.gz tarball when the NuttX-7.10 version was created.

The version.h header file is then generated by tools/mkversion the first time that you build the RTOS. That tool generates this version.h header file for the above .version file:

  /* version.h -- Autogenerated! Do not edit. */
  
  #ifndef __INCLUDE_NUTTX_VERSION_H
  #define __INCLUDE_NUTTX_VERSION_H
  
  #define CONFIG_VERSION_STRING "7.10"
  #define CONFIG_VERSION_MAJOR 7
  #define CONFIG_VERSION_MINOR 10
  #define CONFIG_VERSION_BUILD "85981b37acc215ab795ef4ea4045f3e85a49a7af"
  
  #define CONFIG_VERSION ((CONFIG_VERSION_MAJOR << 8) | (CONFIG_VERSION_MINOR))
  
  #endif /* __INCLUDE_NUTTX_VERSION_H */

And that is where the sysinfo command gets the version information that it prints.

If you are using an un-versioned snapshot of NuttX from the GIT repository, then the .version file will not exist. The make system will check if there is .version file every time you build. If there is no .version in the top-level nuttx directory, then the make system will use the script at tools/version.sh to create one with version 0.0:

  $(TOPDIR)/.version:
      $(Q) if [ ! -f .version ]; then \
          echo "No .version file found, creating one"; \
          tools/version.sh -v 0.0 -b 0 .version; \
          chmod 755 .version; \
      fi

This is completely appropriate if you are using un-versioned code. You are, however, free to edit the top-level .version file to generate any kind of custom versioning information that you would like. It would, however, probably be inappropriate to say you are using a released version when you are not.

Task Name Size

This one is easy. The size of a task name is controlled by the following setting in your .config file:

  CONFIG_TASK_NAME_SIZE=0

It provides the maximum length of a task name. Zero, of course, then means no task names are supported.