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* libio/Makefile (headers): Add stdio_ext.h.
(routines): Add __fbufsize, __freading, __fwriting, __freadable,
__fwritable, __flbf, __fpurge, __fpending, and __fsetlocking.
* libio/Versions [libc] (GLIBC_2.2): Add __fbufsize, __freading,
__fwriting, __freadable, __fwritable, __flbf, __fpurge, __fpending,
__fsetlocking, and _flushlbf.
* libio/__fbufsize.c: New file.
* libio/__flbf.c: New file.
* libio/__fpending.c: New file.
* libio/__fpurge.c: New file.
* libio/__freadable.c: New file.
* libio/__freading.c: New file.
* libio/__fsetlocking.c: New file.
* libio/__fwritable.c: New file.
* libio/__fwriting.c: New file.
* libio/stdio_ext.h: New file.
* libio/genops.c (_IO_flush_all_linebuffered): Add alias _flushlbf.
* libio/libio.h (_IO_USER_LOCK): Define.
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