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Adhemerval Zanella 0b727ed4d6 libio: Flush stream at freopen (BZ#21037) 
As POSIX states [1] a freopen call should first flush the stream as if by a
call fflush.  C99 (n1256) and C11 (n1570) only states the function should
first close any file associated with the specific stream.  Although current
implementation only follow C specification, current BSD and other libc
implementation (musl) are in sync with POSIX and fflush the stream.

This patch change freopen{64} to fflush the stream before actually reopening
it (or returning if the stream does not support reopen).  It also changes the
Linux implementation to avoid a dynamic allocation on 'fd_to_filename'.

Checked on x86_64-linux-gnu.

	[BZ #21037]
	* libio/Makefile (tests): Add tst-memstream4 and tst-wmemstream4.
	* libio/freopen.c (freopen): Sync stream before reopen and adjust to
	new fd_to_filename interface.
	* libio/freopen64.c (freopen64): Likewise.
	* libio/tst-memstream.h: New file.
	* libio/tst-memstream4.c: Likewise.
	* libio/tst-wmemstream4.c: Likewise.
	* sysdeps/generic/fd_to_filename.h (fd_to_filename): Change signature.
	* sysdeps/unix/sysv/linux/fd_to_filename.h (fd_to_filename): Likewise
	and remove internal dynamic allocation.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/
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..
net
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netinet
generic if_ether.h: Fix build
2018-01-19 01:51:10 +01:00
nfs
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sys
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_G_config.h
Post-cleanup 2: minimize _G_config.h.
2018-02-07 10:10:32 -05:00
_itoa.h
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a.out.h
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abort-instr.h
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aio_misc.h
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allocalim.h
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asm-syntax.h
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atomic-machine.h
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c++-types.data
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2015-02-13 15:41:34 -08:00
confstr.h
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device-nrs.h
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dirstream.h
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dl-cache.h
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dl-dtprocnum.h
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dl-dtv.h
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dl-fcntl.h
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dl-fileid.h
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dl-fptr.h
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dl-hash.h
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dl-irel.h
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dl-librecon.h
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dl-lookupcfg.h
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dl-machine.h
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dl-mman.h
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dl-osinfo.h
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dl-procinfo.c
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dl-procinfo.h
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dl-procruntime.c
ld.so: Add architecture specific fields
2017-11-13 08:02:52 -08:00
dl-prop.h
x86: Support IBT and SHSTK in Intel CET [BZ #21598]
2018-07-16 14:08:27 -07:00
dl-sysdep.h
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dl-tls.h
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dl-unistd.h
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dwarf2.h
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elide.h
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eloop-threshold.h
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entry.h
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errqueue.h
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exit-thread.h
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2018-01-01 00:32:25 +00:00
fd_to_filename.h
libio: Flush stream at freopen (BZ#21037)
2018-10-02 10:01:56 -03:00
fenv_private.h
Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h.
2018-09-04 19:52:06 +00:00
fips-private.h
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2018-01-01 00:32:25 +00:00
fix-fp-int-compare-invalid.h
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fix-fp-int-convert-overflow.h
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fix-int-fp-convert-zero.h
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float128-abi.h
Move some float128 symbol version definitions.
2017-10-16 22:04:42 +00:00
fork.h
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fpu_control.h
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framestate.c
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gcc-compat.h
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gccframe.h
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get-rounding-mode.h
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gmp-mparam.h
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hp-timing-common.h
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hp-timing.h
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ifreq.h
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ifunc-init.h
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ifunc-sel.h
Do not stack-protect ifunc resolvers [BZ #7065]
2016-12-26 10:08:41 +01:00
internal-signals.h
Make sysdeps/generic/internal-signals.h less stubby.
2018-04-04 12:37:23 -04:00
intr-msg.h
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inttypes.h
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ld.abilist
Simplify the abilist format
2015-11-06 13:58:53 +01:00
ldbl-classify-compat.h
Move LDBL_CLASSIFY_COMPAT to its own header.
2018-02-01 21:01:00 +00:00
ldconfig.h
Add support for the RISC-V-specific ELF flags
2018-01-25 10:06:19 -08:00
ldsodefs.h
elf: Correct absolute (SHN_ABS) symbol run-time calculation [BZ #19818]
2018-04-04 23:09:37 +01:00
libanl.abilist
Simplify the abilist format
2015-11-06 13:58:53 +01:00
libBrokenLocale.abilist
Simplify the abilist format
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libc-lock.h
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2018-01-01 00:32:25 +00:00
libc-mmap.h
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libc-start.h
hurd: Initialize TLS and libpthread before signal thread start
2018-03-25 00:52:39 +01:00
libc-tsd.h
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libc.abilist
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libcrypt.abilist
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libdl.abilist
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2015-11-06 13:58:53 +01:00
libm-alias-double.h
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libm-alias-float128.h
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libm-alias-float.h
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libm-alias-ldouble.h
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libm-test-ulps
Replace gen-libm-test.pl with gen-libm-test.py.
2018-08-09 15:34:12 +00:00
libm-test-ulps-name
Do not hardcode platform names in manual/libm-err-tab.pl (bug 14139).
2016-11-04 16:49:06 +00:00
libm.abilist
Simplify the abilist format
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libnsl.abilist
Add placeholder libnsl.abilist and libutil.abilist files
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libnss_compat.abilist
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libnss_db.abilist
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libnss_dns.abilist
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libnss_files.abilist
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libnss_hesiod.abilist
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libnss_nis.abilist
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libnss_nisplus.abilist
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libpthread.abilist
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libresolv.abilist
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librt.abilist
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libutil.abilist
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2016-03-07 00:49:36 +01:00
link_map.h
ld.so: Add architecture specific fields
2017-11-13 08:02:52 -08:00
linkmap.h
Rename bits/linkmap.h to linkmap.h (bug 14912).
2015-09-04 19:44:27 +00:00
local-setxid.h
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localplt.data
ld.so: Introduce struct dl_exception
2017-08-10 16:54:57 +02:00
machine-gmon.h
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2018-01-01 00:32:25 +00:00
machine-lock.h
hurd: take __USE_EXTERN_INLINES into account and restrict inlines
2018-01-28 18:46:23 +01:00
machine-sp.h
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2018-01-01 00:32:25 +00:00
Makefile
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malloc-alignment.h
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malloc-machine.h
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malloc-sysdep.h
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2018-01-01 00:32:25 +00:00
math_ldbl_opt.h
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math_ldbl.h
Allow direct use of math_ldbl.h in testsuite.
2017-02-25 10:40:48 -05:00
math_private_calls.h
Use copysign functions not __copysign functions in glibc libm.
2018-09-27 20:04:48 +00:00
math_private.h
Add new pow implementation
2018-09-19 10:04:51 +01:00
math-barriers.h
Move math_opt_barrier, math_force_eval to separate math-barriers.h.
2018-05-09 19:45:47 +00:00
math-nan-payload-double.h
math: Merge strtod_nan_*.h into math-type-macros-*.h
2018-05-16 06:03:08 +02:00
math-nan-payload-float.h
math: Merge strtod_nan_*.h into math-type-macros-*.h
2018-05-16 06:03:08 +02:00
math-tests-arch.h
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2018-01-01 00:32:25 +00:00
math-tests-exceptions.h
Move EXCEPTION_TESTS_* out of math-tests.h
2018-08-23 23:41:13 +00:00
math-tests-rounding.h
Move ROUNDING_TESTS_* out of math-tests.h.
2018-08-22 12:25:50 +00:00
math-tests-snan-cast.h
Move SNAN_TESTS_TYPE_CAST out of math-tests.h.
2018-08-01 11:18:57 +00:00
math-tests-snan-payload.h
Move SNAN_TESTS_PRESERVE_PAYLOAD out of math-tests.h.
2018-08-01 11:21:16 +00:00
math-tests-snan.h
Move SNAN_TESTS_* out of math-tests.h.
2018-08-10 19:22:01 +00:00
math-tests-trap-force.h
Move EXCEPTION_SET_FORCES_TRAP out of math-tests.h.
2018-08-27 18:52:41 +00:00
math-tests-trap.h
Move EXCEPTION_ENABLE_SUPPORTED out of math-tests.h.
2018-08-24 19:18:16 +00:00
math-tests.h
Move EXCEPTION_SET_FORCES_TRAP out of math-tests.h.
2018-08-27 18:52:41 +00:00
math-type-macros-double.h
math: Reverse include order in <math-type-macros-*.h>
2018-05-17 15:48:42 +02:00
math-type-macros-float128.h
math: Reverse include order in <math-type-macros-*.h>
2018-05-17 15:48:42 +02:00
math-type-macros-float.h
math: Reverse include order in <math-type-macros-*.h>
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math-type-macros-ldouble.h
math: Reverse include order in <math-type-macros-*.h>
2018-05-17 15:48:42 +02:00
math-type-macros.h
Use copysign functions not __copysign functions in glibc libm.
2018-09-27 20:04:48 +00:00
memcopy.h
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memusage.h
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2018-01-01 00:32:25 +00:00
nan-high-order-bit.h
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2018-01-01 00:32:25 +00:00
not-cancel.h
Fix Linux fcntl OFD locks for non-LFS architectures (BZ#20251)
2018-06-26 13:22:53 -03:00
not-errno.h
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nscd-types.h
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pagecopy.h
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paths.h
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profil-counter.h
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pty-private.h
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register-dump.h
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rtld-lowlevel.h
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safe-fatal.h
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setjmpP.h
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sigcontextinfo.h
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2018-03-22 16:40:51 +00:00
siglist.h
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2018-01-01 00:32:25 +00:00
sigset-cvt-mask.h
hurd: fix warning
2018-01-27 16:45:55 +01:00
sigsetops.h
hurd: fix warnings
2018-01-27 16:47:36 +01:00
stackguard-macros.h
BZ #15754: Fix test case for ARM.
2013-09-23 01:44:38 -04:00
stackinfo.h
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2018-01-01 00:32:25 +00:00
startup.h
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2018-01-01 00:32:25 +00:00
stdint.h
Define char16_t, char32_t consistently with uint_least16_t, uint_least32_t (bug 17979).
2018-02-07 20:33:55 +00:00
stdio-lock.h
Mechanically remove _IO_ name aliases for types and constants.
2018-02-21 14:11:05 -05:00
string_private.h
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2018-01-01 00:32:25 +00:00
symbol-hacks.h
PLT avoidance for __stack_chk_fail [BZ #7065]
2016-12-26 10:11:05 +01:00
sysdep-cancel.h
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sysdep.h
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thread_state.h
hurd: add TLS support
2018-03-17 03:17:36 +01:00
tininess.h
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2018-01-01 00:32:25 +00:00
tls-macros.h
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tls-setup.h
x86: Rename __glibc_reserved1 to feature_1 in tcbhead_t [BZ #22563]
2018-07-14 05:56:46 -07:00
tls.h
hurd: add gscope support
2018-03-11 13:06:33 +01:00
tst-audit.h
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tst-stack-align.h
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2018-01-01 00:32:25 +00:00
unsecvars.h
Ignore and remove LD_HWCAP_MASK for AT_SECURE programs (bug #21209)
2017-03-07 20:52:04 +05:30
unwind-dw2-fde-glibc.c
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unwind-dw2-fde.c
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unwind-dw2-fde.h
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unwind-dw2.c
[BZ #20271] Add newlines in __libc_fatal calls.
2018-08-31 18:04:32 -07:00
unwind-pe.c
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unwind-pe.h
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unwind-resume.h
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unwind.h
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utmp-equal.h
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