[Bug stdio/21735] New: open_memstream is not fflushed with fflush(0)

[nszabolcs at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21735

            Bug ID: 21735
           Summary: open_memstream is not fflushed with fflush(0)
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: stdio
          Assignee: unassigned at sourceware dot org
          Reporter: nszabolcs at gmail dot com
  Target Milestone: ---

open_memstream is not exempt from the rule that fflush(0)
should fflush all open streams.

posix specifies the state of the buffer and size after
fflush on a stream opened by open_memstream and glibc
is not conform to it, e.g the following test fails:

#include <stdio.h>

int main()
{
        char *buf = 0;
        size_t n = 0;
        FILE *f = open_memstream(&buf, &n);
        putc('x', f);
        fflush(0);
        return n != 1;
}

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