PM87642: TRSQ - ADDITIONAL C/C++ CHANGES

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APAR status

  • Closed as program error.

Error description

  • TRSQ - ADDITIONAL C/C++ CHANGES
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: Users of C/C++ and any of the following:     *
    *                 1.  Applications that call fgets()           *
    *                 2.  Header file <uchar.h>                    *
    *                 3.  Applications that open a member of a PDS *
    *                     for reading and type=blocked             *
    *                 4.  Applications that reposition within a    *
    *                     dataset opened for reading and           *
    *                     type=blocked                             *
    *                 5.  C++ applications that use try, throw     *
    *                     and catch                                *
    ****************************************************************
    * PROBLEM DESCRIPTION: 1. The fgets() function does not        *
    *                         return NULL for any errors that      *
    *                         occur on the read if some data has   *
    *                         been read.                           *
    *                      2. Compile fails when compile option    *
    *                         LANGLVL(EXTC1X) is used and header   *
    *                         file <uchar.h> is included first     *
    *                         because the type size_t is not       *
    *                         defined before it is used.           *
    *                      3. For a member of a PDS opened with    *
    *                         type=blocked, the fread() function   *
    *                         returned data from the next member   *
    *                         in the PDS when called after EOF was *
    *                         reached.                             *
    *                      4. For a dataset opened with            *
    *                         type=blocked, the fread() function   *
    *                         returned data from the last block    *
    *                         when called after an initial fseek() *
    *                         failed because the new location was  *
    *                         before the beginning of the file and *
    *                         a second fseek() set the new         *
    *                         position at end of file.             *
    *                      5. Abend 0C4 occurred in __ds_prev()    *
    *                         when called during catch clean up.   *
    *                         The input DSA address was no longer  *
    *                         on the backchain.                    *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    See Problem Description.
    

Problem conclusion

  • 1. The fgets() function will return NULL for errors on the
       read, unless a partial read occurred on I/O to a PIPE or
       FIFO and errno is set to EAGAIN (which implies the stream
       was opened with O_NONBLOCK).
    2. The header file uchar.h was changed to ensure that the type
       size_t is defined before it is used.
    3. Code was changed to ensure that data in another member is not
       read.
    4. Code was changed to restore the position when fseek() fails
       because the new location is before the beginning of the file.
    5. Code was changed to ensure that catch clean up always calls
       __dsa_pr() with a DSA address that is on the backchain.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM87642

  • Reported component name

    LE C LIBRARY

  • Reported component ID

    568819805

  • Reported release

    790

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-04-23

  • Closed date

    2013-08-07

  • Last modified date

    2013-09-03

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

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

    UK96504

Modules/Macros

  •    CELHEXPT CELHGETS CELHOSRD CELHOSSK CELHP131
    CELJGETS CELQEXPT CELQGETS CELQOSRD CELQOSSK CELQP131 CELZGETS
    EDCBP131 EDC4H0AE EDC400B5 EDC40021 EDC4003B EDC40039
    

Fix information

  • Fixed component name

    LE C LIBRARY

  • Fixed component ID

    568819805

Applicable component levels

  • R790 PSY UK96504

       UP13/08/21 P F308

Fix is available

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Document information


More support for:

z/OS XL C/C++
Runtime

Software version:

790

Operating system(s):

MVS, z/OS

Reference #:

PM87642

Modified date:

2013-09-03

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