[Bug libc/11312] popen should ignore 'b' in mode

["xiyou dot wangcong at gmail dot com" <sourceware-bugzilla@sourceware.org>]

------- Additional Comments From xiyou dot wangcong at gmail dot com  2010-02-23 09:45 -------
(In reply to comment #0)
> For consistency with fopen and freopen, it would be nice if popen(cmd,"rb")
> behaved like popen(cmd,"r") rather than failing with EINVAL.  In particular, the
> extension of supporting 'b' in the mode argument is already provided by Cygwin
> (although in cygwin, it actually makes a difference between text and binary
> pipes).  POSIX does not forbid this extension.
> 
> The request to allow applications to blindly request binary mode, even though it
> is otherwise a no-op in glibc, was first made here:
> http://lists.gnu.org/archive/html/bug-gnulib/2010-02/msg00195.html
> 
> Likewise, it would be nice if other fopen extension flags were gracefully
> handled (silently ignore 'm', 'x', and honor 'c'), since 'e' is already a common
> extension between both fopen and popen.  There is already precedence for this,
> since fdopen silently ignores 'x'.

It seems that ignoring 'b' makes sense.

Patch below does this.


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http://sourceware.org/bugzilla/show_bug.cgi?id=11312

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