libio: fmemopen rewrite to POSIX compliance

This patch added a new fmemopen version, for glibc 2.22, that aims to be
POSIX complaint.  It fixes some long-stading glibc fmemopen issues, such
as:

* it changes the way fseek with SEEK_END works on fmemopen to seek
  relative to buffer size instead of first '\0'.  This is default mode and
  'b' opening mode does not change internal behavior (bz#6544).

* fix apending opening mode to use as start position either first null
  byte of len specified in function call (bz#13152 and #13151).

* remove binary option 'b' and internal different handling (bz#12836)

* fix seek/SEE_END with negative values (bz#14292).

A compatibility symbol is provided to with old behavior for older symbols
version (2.2.5).

	* include/stdio.h (fmemopen): Remove hidden prototype.
	(__fmemopen): Add new hidden prototype.
	* libio/Makefile: Add oldfmemopen object.
	* libio/Versions [GLIBC_2.22]: Add new fmemopen symbol.
	* libio/fmemopen.c (__fmemopen): Function rewrite to be POSIX
	compliance.
	* libio/oldfmemopen.c: New file: old fmemopen implementation for
	symbol compatibility.
	* stdio-common/Makefile [tests]: Add new tst-fmemopen3.
	* stdio-common/psiginfo.c [psiginfo]: Call __fmemopen instead of
	fmemopen.
	* stdio-common/tst-fmemopen3.c: New file: more fmemopen tests, focus
	on append and read mode.
	* sysdeps/unix/sysv/linux/aarch64/libc.abilist [GLIBC_2.22]: Add
	fmemopen.
	* sysdeps/unix/sysv/linux/alpha/libc.abilist [GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/arm/libc.abilist [GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/i386/libc.abilist [GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/ia64/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/microblaze/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/sh/libc.abilist [GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
	[GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist [GLIBC_2.22]:
	Likewise.
	* sysdeps/unix/sysv/linux/hppa/libc.abilist [GLIBC_2.22]: Likewise.
	* sysdeps/unix/sysv/linux/nios2/libc.abilist [GLIBC_2.22]: Likewise.

1 files changed, 24 insertions, 18 deletions

diff --git a/NEWS b/NEWS
index 23388ae9a6..ae0b753cde 100644
--- a/NEWS
+++ b/NEWS
@@ -9,24 +9,25 @@ Version 2.22
 
 * The following bugs are resolved with this release:
 
-  438, 4719, 6792, 13028, 13064, 14094, 14841, 14906, 14958, 15319,
-  15467, 15790, 15969, 16159, 16339, 16350, 16351, 16352, 16353, 16361,
-  16512, 16526, 16538, 16559, 16560, 16704, 16783, 16850, 17053, 17090,
-  17195, 17269, 17293, 17322, 17403, 17523, 17542, 17569, 17581, 17588,
-  17596, 17620, 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779,
-  17792, 17833, 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949,
-  17964, 17965, 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998,
-  17999, 18007, 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038,
-  18039, 18042, 18043, 18046, 18047, 18049, 18068, 18080, 18093, 18100,
-  18104, 18110, 18111, 18116, 18125, 18128, 18138, 18185, 18196, 18197,
-  18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
-  18247, 18287, 18319, 18324, 18333, 18346, 18371, 18397, 18409, 18410,
-  18412, 18418, 18422, 18434, 18435, 18444, 18468, 18469, 18470, 18479,
-  18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508, 18512, 18513,
-  18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532, 18533, 18534,
-  18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547, 18549, 18553,
-  18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593, 18594, 18602,
-  18612, 18613, 18619, 18633, 18641, 18643.
+  438, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152, 14094,
+  14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969, 16159, 16339,
+  16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538, 16559, 16560,
+  16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293, 17322, 17403,
+  17523, 17542, 17569, 17581, 17588, 17596, 17620, 17621, 17628, 17631,
+  17692, 17711, 17715, 17776, 17779, 17792, 17833, 17836, 17841, 17912,
+  17916, 17930, 17932, 17944, 17949, 17964, 17965, 17967, 17969, 17977,
+  17978, 17987, 17991, 17996, 17998, 17999, 18007, 18019, 18020, 18029,
+  18030, 18032, 18034, 18036, 18038, 18039, 18042, 18043, 18046, 18047,
+  18049, 18068, 18080, 18093, 18100, 18104, 18110, 18111, 18116, 18125,
+  18128, 18138, 18185, 18196, 18197, 18206, 18210, 18211, 18217, 18219,
+  18220, 18221, 18234, 18244, 18245, 18247, 18287, 18319, 18324, 18333,
+  18346, 18371, 18397, 18409, 18410, 18412, 18418, 18422, 18434, 18435,
+  18444, 18468, 18469, 18470, 18479, 18483, 18495, 18496, 18497, 18498,
+  18502, 18507, 18508, 18512, 18513, 18519, 18520, 18522, 18527, 18528,
+  18529, 18530, 18532, 18533, 18534, 18536, 18539, 18540, 18542, 18544,
+  18545, 18546, 18547, 18549, 18553, 18557, 18558, 18569, 18583, 18585,
+  18586, 18592, 18593, 18594, 18602, 18612, 18613, 18619, 18633, 18641.
+  18643.
 
 * Cache information can be queried via sysconf() function on s390 e.g. with
   _SC_LEVEL1_ICACHE_SIZE as argument.
@@ -65,6 +66,11 @@ Version 2.22
   Shared library libmvec.so is linked in as needed when using -lm (no need to
   specify -lmvec explicitly for not static builds).
   Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
+
+* A new fmemopen implementation has been added with the goal of POSIX
+  compliance. The new implementation fixes the following long-standing
+  issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
+  old implementation is still present for use be by existing binaries.
 
 Version 2.21