open(FH, "+>>", undef) doesn't set O_APPEND #17058

p5pRT · 2019-06-24T01:50:23Z

Migrated from rt.perl.org#134221 (status was 'pending release')

Searchable as RT134221$

p5pRT · 2019-06-24T01:50:24Z

From e@80x24.org

Created by e@80x24.org

I love using open(FH, MODE, undef) to create unlinked temporary
files with minimal typing.

But I was surprised when using "+>>" as the MODE did not set
O_APPEND on the temporary file handle (or warn about the ">>"
being ignored. I want to use O_APPEND so I can easily append to
it from one callback while while using sendfile or pread+SSL_write
to write to a socket.

I'm using this as a lazy write buffer for reading the output of
process (e.g. git-http-backend/git-archive) while sending to
a client which may not be able to keep up with the output speed.

Thanks for keeping Perl 5 alive!

Perl Info


Flags:
    category=core
    severity=wishlist

Site configuration information for perl 5.24.1:

Configured by Debian Project at Thu Nov 29 11:11:57 UTC 2018.

Summary of my perl5 (revision 5 version 24 subversion 1) configuration:
   
  Platform:
    osname=linux, osvers=3.16.0, archname=i686-linux-gnu-thread-multi-64int
    uname='linux localhost 3.16.0 #1 smp debian 3.16.0 i686 gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dcc=i686-linux-gnu-gcc -Dcpp=i686-linux-gnu-cpp -Dld=i686-linux-gnu-gcc -Dccflags=-DDEBIAN -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -fdebug-prefix-map=/build/perl-s7MFkn/perl-5.24.1=. -fstack-protector-strong -Wformat -Werror=format-security -Dldflags= -Wl,-z,relro -Dlddlflags=-shared -Wl,-z,relro -Dcccdlflags=-fPIC -Darchname=i686-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.24 -Darchlib=/usr/lib/i386-linux-gnu/perl/5.24 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/i386-linux-gnu/perl5/5.24 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.24.1 -Dsitearch=/usr/local/lib/i386-linux-gnu/perl/5.24.1 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dusesitecustomize -Duse64bitint -Dman1ext=1 -Dman3ext=3perl
-Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm -Uusesfio -Uusenm -Ui_libutil -Uversiononly -DDEBUGGING=-g -Doptimize=-O2 -dEs -Duseshrplib -Dlibperl=libperl.so.5.24.1'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=define, usemultiplicity=define
    use64bitint=define, use64bitall=undef, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='i686-linux-gnu-gcc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2 -g',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='6.3.0 20170516', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=12345678, doublekind=3
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12, longdblkind=3
    ivtype='long long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='i686-linux-gnu-gcc', ldflags =' -fstack-protector-strong -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib/gcc/i686-linux-gnu/6/include-fixed /usr/include/i386-linux-gnu /usr/lib /lib/i386-linux-gnu /lib/../lib /usr/lib/i386-linux-gnu /usr/lib/../lib /lib
    libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
    perllibs=-ldl -lm -lpthread -lc -lcrypt
    libc=libc-2.24.so, so=so, useshrplib=true, libperl=libperl.so.5.24
    gnulibc_version='2.24'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib -fstack-protector-strong'

Locally applied patches:
    DEBPKG:debian/cpan_definstalldirs - Provide a sensible INSTALLDIRS default for modules installed from CPAN.
    DEBPKG:debian/db_file_ver - https://bugs.debian.org/340047 Remove overly restrictive DB_File version check.
    DEBPKG:debian/doc_info - Replace generic man(1) instructions with Debian-specific information.
    DEBPKG:debian/enc2xs_inc - https://bugs.debian.org/290336 Tweak enc2xs to follow symlinks and ignore missing @INC directories.
    DEBPKG:debian/errno_ver - https://bugs.debian.org/343351 Remove Errno version check due to upgrade problems with long-running processes.
    DEBPKG:debian/libperl_embed_doc - https://bugs.debian.org/186778 Note that libperl-dev package is required for embedded linking
    DEBPKG:fixes/respect_umask - Respect umask during installation
    DEBPKG:debian/writable_site_dirs - Set umask approproately for site install directories
    DEBPKG:debian/extutils_set_libperl_path - EU:MM: set location of libperl.a under /usr/lib
    DEBPKG:debian/no_packlist_perllocal - Don't install .packlist or perllocal.pod for perl or vendor
    DEBPKG:debian/fakeroot - Postpone LD_LIBRARY_PATH evaluation to the binary targets.
    DEBPKG:debian/instmodsh_doc - Debian policy doesn't install .packlist files for core or vendor.
    DEBPKG:debian/ld_run_path - Remove standard libs from LD_RUN_PATH as per Debian policy.
    DEBPKG:debian/libnet_config_path - Set location of libnet.cfg to /etc/perl/Net as /usr may not be writable.
    DEBPKG:debian/mod_paths - Tweak @INC ordering for Debian
    DEBPKG:debian/prune_libs - https://bugs.debian.org/128355 Prune the list of libraries wanted to what we actually need.
    DEBPKG:fixes/net_smtp_docs - [rt.cpan.org #36038] https://bugs.debian.org/100195 Document the Net::SMTP 'Port' option
    DEBPKG:debian/perlivp - https://bugs.debian.org/510895 Make perlivp skip include directories in /usr/local
    DEBPKG:debian/deprecate-with-apt - https://bugs.debian.org/747628 Point users to Debian packages of deprecated core modules
    DEBPKG:debian/squelch-locale-warnings - https://bugs.debian.org/508764 Squelch locale warnings in Debian package maintainer scripts
    DEBPKG:debian/skip-upstream-git-tests - Skip tests specific to the upstream Git repository
    DEBPKG:debian/patchlevel - https://bugs.debian.org/567489 List packaged patches for 5.24.1-3+deb9u5 in patchlevel.h
    DEBPKG:debian/skip-kfreebsd-crash - https://bugs.debian.org/628493 [perl #96272] Skip a crashing test case in t/op/threads.t on GNU/kFreeBSD
    DEBPKG:fixes/document_makemaker_ccflags - https://bugs.debian.org/628522 [rt.cpan.org #68613] Document that CCFLAGS should include $Config{ccflags}
    DEBPKG:debian/find_html2text - https://bugs.debian.org/640479 Configure CPAN::Distribution with correct name of html2text
    DEBPKG:debian/perl5db-x-terminal-emulator.patch - https://bugs.debian.org/668490 Invoke x-terminal-emulator rather than xterm in perl5db.pl
    DEBPKG:debian/cpan-missing-site-dirs - https://bugs.debian.org/688842 Fix CPAN::FirstTime defaults with nonexisting site dirs if a parent is writable
    DEBPKG:fixes/memoize_storable_nstore - [rt.cpan.org #77790] https://bugs.debian.org/587650 Memoize::Storable: respect 'nstore' option not respected
    DEBPKG:debian/regen-skip - Skip a regeneration check in unrelated git repositories
    DEBPKG:debian/makemaker-pasthru - https://bugs.debian.org/758471 Pass LD settings through to subdirectories
    DEBPKG:debian/makemaker-manext - https://bugs.debian.org/247370 Make EU::MakeMaker honour MANnEXT settings in generated manpage headers
    DEBPKG:debian/devel-ppport-reproducibility - https://bugs.debian.org/801523 Sort the list of XS code files when generating RealPPPort.xs
    DEBPKG:debian/encode-unicode-bom-doc - https://bugs.debian.org/798727 Document Debian backport of Encode::Unicode fix
    DEBPKG:debian/kfreebsd-softupdates - https://bugs.debian.org/796798 Work around Debian Bug#796798
    DEBPKG:fixes/autodie-scope - https://bugs.debian.org/798096 Fix a scoping issue with "no autodie" and the "system" sub
    DEBPKG:fixes/crosscompile-no-targethost - [23695c0] [perl #127234] Fix the Configure escape with usecrosscompile but no targethost
    DEBPKG:fixes/memoize-pod - [rt.cpan.org #89441] Fix POD errors in Memoize
    DEBPKG:fixes/ok-pod - Added encoding for pod.
    DEBPKG:debian/hurd-softupdates - https://bugs.debian.org/822735 Fix t/op/stat.t failures on hurd
    DEBPKG:fixes/nntp_docs - https://bugs.debian.org/51962 Net::NNTP: Correct innd/nnrpd confusion in relation to Reader option
    DEBPKG:fixes/math_complex_doc_great_circle - https://bugs.debian.org/697567 [rt.cpan.org #114104] Math::Trig: clarify definition of great_circle_midpoint
    DEBPKG:fixes/math_complex_doc_see_also - https://bugs.debian.org/697568 [rt.cpan.org #114105] Math::Trig: add missing SEE ALSO
    DEBPKG:fixes/math_complex_doc_angle_units - https://bugs.debian.org/731505 [rt.cpan.org #114106] Math::Trig: document angle units
    DEBPKG:fixes/cpan_web_link - https://bugs.debian.org/367291 CPAN: Add link to main CPAN web site
    DEBPKG:fixes/time_piece_doc - https://bugs.debian.org/817925 Time::Piece: Improve documentation for add_months and add_years
    DEBPKG:fixes/perlbug-refactor - https://bugs.debian.org/822463 [perl #128020] perlbug: Refactor duplicated file reading code
    DEBPKG:fixes/perlbug-linewrap - https://bugs.debian.org/822463 [perl #128020] perlbug: wrap overly long lines
    DEBPKG:fixes/hurd_sigaction - https://bugs.debian.org/825016 [d54f4ed] ext/POSIX/t/sigaction.t: Skip uid and pid tests on GNU/Hurd
    DEBPKG:fixes/hurd_hints - [4694301] https://bugs.debian.org/825020 [perl #128279] Modify hints for Hurd per Debian ticket 825020.
    DEBPKG:fixes/extutils-parsexs-reproducibility - [perl #128517] https://bugs.debian.org/829296 Make the output of ExtUtils::ParseXS reproducible
    DEBPKG:debian/CVE-2016-1238/sitecustomize-in-etc - Look for sitecustomize.pl in /etc/perl rather than sitelib on Debian systems
    DEBPKG:debian/CVE-2016-1238/test-suite-without-dot - [perl #127810] Patch unit tests to explicitly insert "." into @INC when needed.
    DEBPKG:debian/CVE-2016-1238/eumm-without-dot - [perl #127810] Add PERL_USE_UNSAFE_INC support to EU::MM for fortify_inc support.
    DEBPKG:debian/CVE-2016-1238/cpan-without-dot - [perl #127810] Set PERL_USE_UNSAFE_INC for cpan usage
    DEBPKG:debian/document_inc_removal - Document in perlvar that we remove '.' from @INC by default
    DEBPKG:fixes/extutils_makemaker_reproducible - https://bugs.debian.org/835815 https://bugs.debian.org/834190 Make perllocal.pod files reproducible
    DEBPKG:debian/CVE-2016-1238/remove-inc-test - Remove test for '.' in @INC as it might not be
    DEBPKG:fixes/file_path_hurd_errno - File-Path: Fix test failure in Hurd due to hard-coded ENOENT
    DEBPKG:debian/hppa_op_optimize_workaround - https://bugs.debian.org/838613 Temporarily lower the optimization of op.c on hppa due to gcc-6 problems
    DEBPKG:fixes/test-builder-warning - https://bugs.debian.org/840968 Silence a 'used only once' warning in Test::Builder
    DEBPKG:fixes/longdblinf-randomness - [dd68853] [perl #130133] https://bugs.debian.org/844752 Configure: fix garbage filtering with 80-bit long doubles
    DEBPKG:debian/installman-utf8 - https://bugs.debian.org/840211 Generate man pages with UTF-8 characters
    DEBPKG:fixes/list_assign_leak - [1050723] [perl #130766] https://bugs.debian.org/855064 avoid a leak in list assign from/to magic values
    DEBPKG:fixes/perlfunc_inc_doc - [a03e9f8] https://bugs.debian.org/839536 [perl #130832] Documentation fixes for '.' possibly no longer being in @INC
    DEBPKG:fixes/file_path_chmod_race - https://bugs.debian.org/863870 [rt.cpan.org #121951] Prevent directory chmod race attack.
    DEBPKG:fixes/extutils_file_path_compat - Correct the order of tests of chmod(). (#294)
    DEBPKG:debian/customized - Update customized.dat for files patched in Debian
    DEBPKG:fixes/getopt-long-1 - https://bugs.debian.org/855532 [rt.cpan.org #114999] Fix bug RT#114999
    DEBPKG:fixes/getopt-long-2 - [rt.cpan.org #120300] Withdraw part of commit 5d9947fb445327c7299d8beb009d609bc70066c0, which tries to implement more GNU getopt_long campatibility. GNU
    DEBPKG:fixes/getopt-long-3 - provide a default value for optional arguments
    DEBPKG:fixes/getopt-long-4 - https://bugs.debian.org/864544 [rt.cpan.org #122068] Fix issue #122068.
    DEBPKG:fixes/fbm-instr-crash - [bb152a4] [perl #131575] https://bugs.debian.org/864782 don't call Perl_fbm_instr() with negative length
    DEBPKG:debian/CVE-2016-1238/base-pm-amends-pt2 - [1afa289] Limit dotless-INC effect on base.pm with guard:
    DEBPKG:fixes/CVE-2017-12837 - https://bugs.debian.org/875596 [perl #131582] [f7e5417] regcomp [perl #131582]
    DEBPKG:fixes/CVE-2017-12883 - https://bugs.debian.org/875597 [perl #131598] [40b3cda] PATCH: [perl #131598]
    DEBPKG:fixes/CVE-2018-6797 - [perl #132227] (perl #132227) restart a node if we change to uni rules within the node and encounter a sharp S
    DEBPKG:fixes/CVE-2018-6798/pt1 - [perl #132063] Heap buffer overflow
    DEBPKG:fixes/CVE-2018-6798/pt2 - [perl #132063] v5.24.3: fix TRIE_READ_CHAR and DECL_TRIE_TYPE to account for non-utf8 target
    DEBPKG:fixes/CVE-2018-6798/pt3 - [perl #132063] (perl #132063) we should no longer warn for this code
    DEBPKG:fixes/CVE-2018-6913 - [perl #131844] (perl #131844) fix various space calculation issues in pp_pack.c
    DEBPKG:fixes/CVE-2018-12015-Archive-Tar-directory-traversal - https://bugs.debian.org/900834 [rt.cpan.org #125523] Remove existing files before overwriting them
    DEBPKG:fixes/CVE-2018-18311 - Perl_my_setenv(); handle integer wrap
    DEBPKG:fixes/CVE-2018-18312 - for 5.26 maint
    DEBPKG:fixes/CVE-2018-18313 - regcomp.c: Convert some strchr to memchr
    DEBPKG:fixes/CVE-2018-18314 - fix #131649 - extended charclass can trigger assert


@INC for perl 5.24.1:
    /etc/perl
    /usr/local/lib/i386-linux-gnu/perl/5.24.1
    /usr/local/share/perl/5.24.1
    /usr/lib/i386-linux-gnu/perl5/5.24
    /usr/share/perl5
    /usr/lib/i386-linux-gnu/perl/5.24
    /usr/share/perl/5.24
    /usr/local/lib/site_perl
    /usr/lib/i386-linux-gnu/perl-base


Environment for perl 5.24.1:
    HOME=/home/ew
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/lib/ccache:/home/ew/r/trunk/bin:/home/ew/bin:/usr/local/bin:/usr/bin:/bin
    PERL_BADLANG (unset)
    SHELL=/bin/bash

p5pRT · 2019-07-02T05:45:59Z

From @tonycoz

On Sun, 23 Jun 2019 18:50:24 -0700, e@80x24.org wrote:

I love using open(FH, MODE, undef) to create unlinked temporary
files with minimal typing.

But I was surprised when using "+>>" as the MODE did not set
O_APPEND on the temporary file handle (or warn about the ">>"
being ignored. I want to use O_APPEND so I can easily append to
it from one callback while while using sendfile or pread+SSL_write
to write to a socket.

I'm using this as a lazy write buffer for reading the output of
process (e.g. git-http-backend/git-archive) while sending to
a client which may not be able to keep up with the output speed.

I've attached a partial solution, that works on Linux (and presumably other POSIX-ish systems) and Win32.

From what I remember of a discussion with Craig back when working on the in-place editing re-work, the code currently guarded by !defined(VMS) should also work on VMS, except for the default to /tmp/.

Tony

p5pRT · 2019-07-02T05:45:59Z

From @tonycoz

open-temp-flags.diff

p5pRT · 2019-07-02T05:45:59Z

The RT System itself - Status changed from 'new' to 'open'

p5pRT · 2019-07-02T07:18:35Z

From e@80x24.org

Tony Cook via RT <perlbug-followup@perl.org> wrote:

On Sun, 23 Jun 2019 18:50:24 -0700, e@80x24.org wrote:

I love using open(FH, MODE, undef) to create unlinked temporary
files with minimal typing.

But I was surprised when using "+>>" as the MODE did not set
O_APPEND on the temporary file handle (or warn about the ">>"
being ignored. I want to use O_APPEND so I can easily append to
it from one callback while while using sendfile or pread+SSL_write
to write to a socket.

I've attached a partial solution, that works on Linux (and
presumably other POSIX-ish systems) and Win32.

Thanks, I can confirm "+>>" works and sets O_APPEND with your
patches on top of 82651ab on
my FreeBSD 11.2 system.

However, there's a regression:

"+>" (which previously worked and is documented) now fails
completely:

./perl -e 'open(my $fh, "+>", undef) or die "open: $!"'

I couldn't even find the syscall being made via truss.

From what I remember of a discussion with Craig back when
working on the in-place editing re-work, the code currently
guarded by !defined(VMS) should also work on VMS, except for
the default to /tmp/.

I have no clue about non-POSIX-ish stuff :x

https://rt-archive.perl.org/perl5/Ticket/Display.html?id=134221

p5pRT · 2019-07-03T01:08:24Z

From @tonycoz

On Tue, 02 Jul 2019 00:18:35 -0700, e@80x24.org wrote:

Tony Cook via RT <perlbug-followup@perl.org> wrote:

On Sun, 23 Jun 2019 18:50:24 -0700, e@80x24.org wrote:

I love using open(FH, MODE, undef) to create unlinked temporary
files with minimal typing.

But I was surprised when using "+>>" as the MODE did not set
O_APPEND on the temporary file handle (or warn about the ">>"
being ignored. I want to use O_APPEND so I can easily append to
it from one callback while while using sendfile or pread+SSL_write
to write to a socket.

I've attached a partial solution, that works on Linux (and
presumably other POSIX-ish systems) and Win32.

Thanks, I can confirm "+>>" works and sets O_APPEND with your
patches on top of 82651ab on
my FreeBSD 11.2 system.

However, there's a regression:

"+>" (which previously worked and is documented) now fails
completely:

./perl -e 'open(my $fh, "+>", undef) or die "open: $!"'

I couldn't even find the syscall being made via truss.

Here's an updated patch.

Tony

p5pRT · 2019-07-03T01:08:24Z

From @tonycoz

open-temp-flags2.diff

p5pRT · 2019-07-03T01:34:26Z

From e@80x24.org

Tony Cook via RT <perlbug-followup@perl.org> wrote:

On Tue, 02 Jul 2019 00:18:35 -0700, e@80x24.org wrote:

However, there's a regression:

"+>" (which previously worked and is documented) now fails
completely:

./perl -e 'open(my $fh, "+>", undef) or die "open: $!"'

I couldn't even find the syscall being made via truss.

Here's an updated patch.

Looks good and confirmed both "+>" and "+>>" via truss output on
FreeBSD 11.2

p5pRT · 2019-07-16T06:23:12Z

From @tonycoz

On Tue, 02 Jul 2019 18:34:26 -0700, e@80x24.org wrote:

Tony Cook via RT <perlbug-followup@perl.org> wrote:

On Tue, 02 Jul 2019 00:18:35 -0700, e@80x24.org wrote:

However, there's a regression:

"+>" (which previously worked and is documented) now fails
completely:

./perl -e 'open(my $fh, "+>", undef) or die "open: $!"'

I couldn't even find the syscall being made via truss.

Here's an updated patch.

Looks good and confirmed both "+>" and "+>>" via truss output on
FreeBSD 11.2

Craig helped me out with the VMS support.

So:

ae73d7e append mode for POSIX-like systems
0424723 for Win32
74b421c and VMS now (sort of) uses the same mkostemp() code that POSIX-like systems do.

Tony

p5pRT · 2019-07-16T06:31:49Z

@tonycoz - Status changed from 'open' to 'pending release'

p5pRT · 2019-07-18T19:24:20Z

From @steve-m-hay

Unfortunately, this has broken VC++ builds on Windows (at least VC6 thru VC2015) - there is no O_ACCMODE here.

p5pRT · 2019-07-19T01:02:32Z

From @tonycoz

On Thu, 18 Jul 2019 12:24:20 -0700, shay wrote:

Unfortunately, this has broken VC++ builds on Windows (at least VC6
thru VC2015) - there is no O_ACCMODE here.

Fixed by 52bd4b1.

Tony

p5pRT closed this as completed Jul 16, 2019

p5pRT added Wishlist affects-5.24 distro-Linux type-core labels Oct 19, 2019

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open(FH, "+>>", undef) doesn't set O_APPEND #17058

open(FH, "+>>", undef) doesn't set O_APPEND #17058

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open(FH, "+>>", undef) doesn't set O_APPEND #17058

open(FH, "+>>", undef) doesn't set O_APPEND #17058

Comments

p5pRT commented Jun 24, 2019

p5pRT commented Jun 24, 2019

From e@80x24.org

Created by e@80x24.org

p5pRT commented Jul 2, 2019

From @tonycoz

p5pRT commented Jul 2, 2019

From @tonycoz

p5pRT commented Jul 2, 2019

p5pRT commented Jul 2, 2019

From e@80x24.org

p5pRT commented Jul 3, 2019

From @tonycoz

p5pRT commented Jul 3, 2019

From @tonycoz

p5pRT commented Jul 3, 2019

From e@80x24.org

p5pRT commented Jul 16, 2019

From @tonycoz

p5pRT commented Jul 16, 2019

p5pRT commented Jul 18, 2019

From @steve-m-hay

p5pRT commented Jul 19, 2019

From @tonycoz