PM84041: FGETS DOES NOT RETURN A NULL AFTER A SPORADIC EIO ERROR ENCOUNTERED WHEN READING FROM AN NFS FILE

APAR status

• Closed as unreproducible in next release.

Error description

• When reading from an NFS file, the application sometimes
  encounters the following message:
  
   EDC5122I Input/output error. (errno2=0x6E288872)
  
  EDC5122I is equivalent to errno x'7A' EIO reporting an I/O
  error occurred and fgets() returns the partial data in the
  buffer instead of returning a NULL.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: C/C++ applications that call the fgets()     *
  *                 library function.                            *
  ****************************************************************
  * PROBLEM DESCRIPTION: According to the Single UNIX            *
  *                      Specification, the fgets() function     *
  *                      should return NULL if an I/O error is   *
  *                      encountered during a read.  However,    *
  *                      the z/OS XL C/C++ implementation of     *
  *                      fgets() is returning a non-NULL value   *
  *                      when some data is read into the user    *
  *                      supplied buffer as the result of a      *
  *                      partial read prior to the occurrence    *
  *                      of an I/O error.                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  See Problem Description.
  

Problem conclusion

Temporary fix

Comments

• This APAR is being closed UR1 with concurrence from the
  submitting customer. This means that a fix to this APAR is
  expected to be delivered from IBM in a release (if any) to be
  available within the next 36 months.
  

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

  LE C LIBRARY

• Fixed component ID

  568819805

Applicable component levels

• R770 PSN

     UP

• R780 PSN

     UP

• R790 PSN

     UP