[Bug 5984] New: Enable UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE by default

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=5984

           Summary: Enable UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE by default
           Product: uClibc
           Version: 0.9.33.3
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: stdio
        AssignedTo: unassigned at uclibc.org
        ReportedBy: noloader at gmail.com
                CC: uclibc-cvs at uclibc.org
   Estimated Hours: 0.0


The description is below, but I believe its not quite correct.
C11 adds the "x" mode, so its not a glibc thing anymore. See, for example,
https://www.securecoding.cert.org/confluence/display/seccode/FIO03-C.+Do+not+make+assumptions+about+fopen%28%29+and+file+creation.

I understand uClibc may not be C11 compliant (and may not even desire it). But
"x" mode has security implications, and claiming its a compat option may not be
doing it justice.

   ───── Support an fopen() 'x' flag for exclusive mode (glibc-compat) ─────┐
  │ UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE:                                        │  
  │                                                                         │  
  │ Answer Y to support a glibc extension to allow passing                  │  
  │ additional 'x' flag in the mode string for fopen() to specify that      │  
  │ the file should be open()ed with the O_EXCL flag set.                   │  
  │                                                                         │  
  │ Most people will answer N.                                              │  
  │                                                                         │  
  │ Symbol: UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE [=y]                            │  
  │ Prompt: Support an fopen() 'x' flag for exclusive mode (glibc-compat)   │  
  │   Defined at extra/Configs/Config.in:1728                               │  
  │   Location:                                                             │  
  │     -> String and Stdio Support

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