Bug #9049

smbios(1M) confusingly uses literal tabs in output strings

Added by Robert Mustacchi about 2 years ago. Updated about 2 years ago.

cmd - userland programs
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While using the smbios command, I noticed something odd. The main thing was that the output when it dumped hex data was not aligned. For example, consider the following:

57600 38   SMB_TYPE_OEM_LO+97 (type 225)

         offset:   0 1 2 3  4 5 6 7  8 9 a b  c d e f  0123456789abcdef
            0:  e10d00e1 01010004 00020104 00435055  .............CPU
         0x10:  2e536f63 6b65742e 31004350 552e536f  .Socket.1.CPU.So
         0x20:  636b6574 2e32                        cket.2          

Notice how the offset line is further indented from everything else. When I went looking at the code, I found a rather perculiar format string. Notable it looked like:

         oprintf(fp, "\n  offset:   0 1 2 3  4 5 6 7  8 9 a b  c d e f  " 

However, the first character after the \n was a tab character and not a space. Looking at this further, I found this had changed with illumos#5094. And in fact this was not the only thing that was like this. There were a half dozen different places this had occurred. Take the following example:

4096  23   SMB_TYPE_MEMARRAY (type 16) (physical memory array)

  Location: 3 (system board or motherboard)
  Use: 3 (system memory)
  ECC: 6 (multi-bit ECC)
  Number of Slots/Sockets: 24
         Memory Error Data: Not Supported
  Max Capacity: 3298534883328 bytes

4352  92   SMB_TYPE_MEMDEVICE (type 17) (memory device)

  Manufacturer: 00CE00B300CE
  Serial Number: 32C3433E
  Asset Tag: 00162630
  Location Tag: A1
  Part Number: M393A2K43BB1-CRC  

         Physical Memory Array: 4096
         Memory Error Data: Not Supported
  Total Width: 72 bits
  Data Width: 64 bits
  Size: 17179869184 bytes
  Form Factor: 9 (DIMM)
  Set: 1
  Rank: 2 (dual)
  Memory Type: 26 (DDR4)
  Flags: 0x2080
        SMB_MDF_SYNC (synchronous)
        SMB_MDF_REG (Registered (Buffered))
  Speed: 2400 MT/s
  Configured Speed: 2400 MT/s
  Device Locator: A1
  Bank Locator: 
  Minimum Voltage: 1.20V
  Maximum Voltage: 1.20V

See how there are a few entries which are not indented the same as everything else. This is because of the impact of the tabs.

Related issues

Related to illumos gate - Feature #5094: Update libsmbios with recent itemsClosed2014-08-14




Updated by Robert Mustacchi about 2 years ago

  • Related to Feature #5094: Update libsmbios with recent items added

Updated by Electric Monk about 2 years ago

  • Status changed from New to Closed

git commit e9cac61d8dc1ac02dd8eed83d984709ce38b49f2

commit  e9cac61d8dc1ac02dd8eed83d984709ce38b49f2
Author: Robert Mustacchi <>
Date:   2018-02-13T17:16:23.000Z

    9049 smbios(1M) confusingly uses literal tabs in output strings
    9050 smbios hex dump isn't aligned for triple digit offsets
    Reviewed by: Jerry Jelinek <>
    Reviewed by: Ryan Zezeski <>
    Reviewed by: Yuri Pankov <>
    Reviewed by: Toomas Soome <>
    Approved by: Richard Lowe <>

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