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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/
2018-10-02 10:01:56 -03:00
..
net Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
netinet generic if_ether.h: Fix build 2018-01-19 01:51:10 +01:00
nfs Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sys Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
_G_config.h Post-cleanup 2: minimize _G_config.h. 2018-02-07 10:10:32 -05:00
_itoa.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
a.out.h
abort-instr.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
aio_misc.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
allocalim.h
asm-syntax.h
atomic-machine.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
c++-types.data
confstr.h
device-nrs.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dirstream.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-cache.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-dtprocnum.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-dtv.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-fcntl.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-fileid.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-fptr.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-hash.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-irel.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-librecon.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-lookupcfg.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-machine.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-mman.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-osinfo.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-procinfo.c
dl-procinfo.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-tls.h
dl-unistd.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dwarf2.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
elide.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
eloop-threshold.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
entry.h
errqueue.h
exit-thread.h Update copyright dates with scripts/update-copyrights. 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 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
fix-fp-int-compare-invalid.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
fix-fp-int-convert-overflow.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
fix-int-fp-convert-zero.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
float128-abi.h Move some float128 symbol version definitions. 2017-10-16 22:04:42 +00:00
fork.h
fpu_control.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
framestate.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
gcc-compat.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
gccframe.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
get-rounding-mode.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
gmp-mparam.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
hp-timing-common.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
hp-timing.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ifreq.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ifunc-init.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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
inttypes.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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 2015-11-06 13:58:53 +01:00
libc-lock.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libc-mmap.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libc-start.h hurd: Initialize TLS and libpthread before signal thread start 2018-03-25 00:52:39 +01:00
libc-tsd.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libc.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libcrypt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libdl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libm-alias-double.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-alias-float128.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-alias-float.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-alias-ldouble.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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 2015-11-06 13:58:53 +01:00
libnsl.abilist Add placeholder libnsl.abilist and libutil.abilist files 2016-03-07 00:49:36 +01:00
libnss_compat.abilist
libnss_db.abilist
libnss_dns.abilist
libnss_files.abilist
libnss_hesiod.abilist
libnss_nis.abilist
libnss_nisplus.abilist
libpthread.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libresolv.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
librt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libutil.abilist Add placeholder libnsl.abilist and libutil.abilist files 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
localplt.data ld.so: Introduce struct dl_exception 2017-08-10 16:54:57 +02:00
machine-gmon.h Update copyright dates with scripts/update-copyrights. 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 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
Makefile Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
malloc-alignment.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
malloc-machine.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
malloc-sysdep.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
math_ldbl_opt.h
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 Update copyright dates with scripts/update-copyrights. 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> 2018-05-17 15:48:42 +02:00
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 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memusage.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
nan-high-order-bit.h Update copyright dates with scripts/update-copyrights. 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 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
nscd-types.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
pagecopy.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
paths.h
profil-counter.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
pty-private.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
register-dump.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
rtld-lowlevel.h
safe-fatal.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
setjmpP.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sigcontextinfo.h Remove unused frame.h header, sigcontextinfo.h macros. 2018-03-22 16:40:51 +00:00
siglist.h Update copyright dates with scripts/update-copyrights. 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
stackinfo.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
startup.h Update copyright dates with scripts/update-copyrights. 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 Update copyright dates with scripts/update-copyrights. 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
sysdep.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
thread_state.h hurd: add TLS support 2018-03-17 03:17:36 +01:00
tininess.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tls-macros.h
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
tst-stack-align.h Update copyright dates with scripts/update-copyrights. 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 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
unwind-dw2-fde.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
unwind-dw2-fde.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
unwind-dw2.c [BZ #20271] Add newlines in __libc_fatal calls. 2018-08-31 18:04:32 -07:00
unwind-pe.c
unwind-pe.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
unwind-resume.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
unwind.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
utmp-equal.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00