IV78285: BAD FILE DESCRIPTOR DUE TO OFSTREAM NOT RELEASING FILE AFTER ENOSPC IN XL C++ RUNTIME

XL C/C++ for AIX Fix Pack 21 (October 2015 PTF) for 10.1
XL C++ Runtime for AIX Fix Pack 5 (October 2015 PTF) for 12.1
XL C/C++ for AIX Fix Pack 14 (December 2015 Update) for 12.1
XL C/C++ for AIX Fix Pack 15 (April 2016 Update) for 12.1
XL C/C++ for AIX Fix Pack 16 (July 2016 Update) for 12.1
XL C/C++ for AIX Fix Pack 17 (November 2016 Update) for 12.1
XL C/C++ for AIX Fix Pack 18 (February 2017 Update) for 12.1
XL C/C++ for AIX Fix Pack 19 (August 2017 Update) for 12.1
XL C/C++ for AIX Fix Pack 20 (March 2018 Update) for 12.1
XL C/C++ for AIX Fix Pack 21 (January 2019 Update) for 12.1

APAR status

• Closed as program error.

Error description

• Continuation from APAR IV73852.  The fix for APAR IV73852 is
  contained within the <fstream> header file.  The XL C++ Runtime
  must be re-built with this fixed header file to correct any
  instances of the issue due to <fstream> usage within the XL C++
  Runtime itself.
  

Local fix

Problem summary

• PROBLEM DESCRIPTION:
  The ofstream object incorrectly keeps the file descriptor alive
  after fclose() failed and the is_open flag remains true. This
  allows the second fclose() to close the file but the file
  descriptor has been freed by the first fclose() and reused by
  the system for another file.  As a result, the second fclose()
  closes a different stream.
  
  USERS AFFECTED:
  Users who close a file stream twice because the first attempt
  failed with an error such as no space left on device.
  

Problem conclusion

• The ofstream object behavior does not comply with the C++
  standard and has now been fixed.
  
  This APAR (IV78285) denotes a
  re-build of the XL C++ Runtime to use the fixed <fstream> header
  file, to ensure all usage of ofstream within the XL C++ Runtime
  itself is corrected.
  
  APAR IV73852 denotes the fix to the <fstream> header
  file, which corrects the problem in applications that use
  ofstream directly in their code.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  XL C/C++ FOR AI

• Fixed component ID

  5725C7200

Applicable component levels

• RC10 PSY

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