DOCFIX: fopen() Will Set errno Values Incorrect in Documentation

The information in this article applies to:

• The C Run-time (CRT), included with:

      - Microsoft C for MS-DOS, versions 6.0, 6.0a, 6.0ax
      - Microsoft C/C++ for MS-DOS, version 7.0
      - Microsoft Visual C++ for Windows, versions 1.0, 1.5
      - Microsoft Visual C++ 32-bit Edition, versions 1.0, 2.0, 5.0
  

SUMMARY

The documentation for the open() and sopen() functions indicates that these functions set errno values, while the fopen() documentation does not explicitly state this. However, fopen() will set errno for most of the same error conditions as open() and sopen().

Internally, fopen() calls many of the same low-level routines that open() and sopen() call. Because these routines set errno on an error, errno is also set for errors with fopen(). The one errno value that is NOT set with fopen() is EMFILE. For more information on the exact errno values, refer to the documentation for open().

This problem was fixed in the Books On-line of Microsoft Visual C++, 32-bit Edition, version 4.0.

Keywords          : CRTIss kbfasttip
Version           : MS-DOS: 6.0, 6.00a, 6.00ax, 7.0; WINDOWS: 1.0, 1.5; WINDOWS NT: 1.0, 2.0, 2.1, 5.0
Platform          : MS-DOS NT WINDOWS
Issue type        : kbdocerr
Solution Type     : kbdocfix