[Bug stdio/16724] New: offset computation in ftell is incorrect when a read is followed by a write for files opened in a+ mode

["siddhesh at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16724

            Bug ID: 16724
           Summary: offset computation in ftell is incorrect when a read
                    is followed by a write for files opened in a+ mode
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: stdio
          Assignee: siddhesh at redhat dot com
          Reporter: siddhesh at redhat dot com

ftell reports an incorrect offset when a file opened in a+ mode is first read
from and then written to.  This is because the assumption of _IO_read_end
coinciding with the external file position is not correct when O_APPEND is in
effect.

Fix coming up.

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