{"id":2234839,"url":"http://patchwork.ozlabs.org/api/1.2/covers/2234839/?format=json","web_url":"http://patchwork.ozlabs.org/project/glibc/cover/20260508060410.13725-1-gaoxiang@kylinos.cn/","project":{"id":41,"url":"http://patchwork.ozlabs.org/api/1.2/projects/41/?format=json","name":"GNU C Library","link_name":"glibc","list_id":"libc-alpha.sourceware.org","list_email":"libc-alpha@sourceware.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260508060410.13725-1-gaoxiang@kylinos.cn>","list_archive_url":null,"date":"2026-05-08T06:04:08","name":"[v5,0/2] libio: Keep memstream result buffers independent of setvbuf","submitter":{"id":92909,"url":"http://patchwork.ozlabs.org/api/1.2/people/92909/?format=json","name":"Gao Xiang","email":"gaoxiang@kylinos.cn"},"mbox":"http://patchwork.ozlabs.org/project/glibc/cover/20260508060410.13725-1-gaoxiang@kylinos.cn/mbox/","series":[{"id":503327,"url":"http://patchwork.ozlabs.org/api/1.2/series/503327/?format=json","web_url":"http://patchwork.ozlabs.org/project/glibc/list/?series=503327","date":"2026-05-08T06:04:09","name":"libio: Keep memstream result buffers independent of setvbuf","version":5,"mbox":"http://patchwork.ozlabs.org/series/503327/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/covers/2234839/comments/","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","libc-alpha@sourceware.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","libc-alpha@sourceware.org"],"Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=2620:52:6:3111::32; helo=vm01.sourceware.org;\n envelope-from=libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org;\n 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URL:0,TC:0,Content:0,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTIO\n N:release,TS:5","X-CID-INFO":"VERSION:1.3.12, REQID:6310c4b0-ffd1-4667-b68e-a81400d27465, IP:10,\n UR\n L:0,TC:0,Content:0,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTION:\n release,TS:5","X-CID-META":"VersionHash:e7bac3a, CLOUDID:15b22eff48cc6af7979c10ba694ae800,\n BulkI\n D:260508140625BX3IODUT,BulkQuantity:0,Recheck:0,SF:17|19|66|78|81|82|102|1\n 27|898,TC:nil,Content:0|15|50,EDM:-3,IP:-2,URL:0,File:nil,RT:nil,Bulk:nil,\n QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0\n ,ARC:0","X-CID-BVR":"2,SSN|SDN","X-CID-BAS":"2,SSN|SDN,0,_","X-CID-FACTOR":"TF_CID_SPAM_SNR,TF_CID_SPAM_FAS,TF_CID_SPAM_FSD","X-CID-RHF":"D41D8CD98F00B204E9800998ECF8427E","X-User":"gaoxiang@kylinos.cn","From":"Gao Xiang ","To":"libc-alpha@sourceware.org","Cc":"Adhemerval Zanella Netto ,\n Andreas Schwab , Rocket Ma ,\n Xiang Gao ","Subject":"[PATCH v5 0/2] libio: Keep memstream result buffers independent of\n setvbuf","Date":"Fri, 8 May 2026 14:04:08 +0800","Message-ID":"<20260508060410.13725-1-gaoxiang@kylinos.cn>","X-Mailer":"git-send-email 2.53.0","In-Reply-To":"<20260507094000.22966-1-gaoxiang@kylinos.cn>","References":"<20260507094000.22966-1-gaoxiang@kylinos.cn>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-BeenThere":"libc-alpha@sourceware.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Libc-alpha mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org"},"content":"From: Xiang Gao \n\nThis series fixes two paths where setbuf/setvbuf can interfere with \nthe growable result buffers managed by open_memstream and\nopen_wmemstream.\n\nPatch 1 keeps the v2 setbuf fix: memstream-specific setbuf hooks keep\nthe internal growable result buffer unchanged.\n\nPatch 2 handles the setvbuf (stream, NULL, _IOFBF, 0) path, which can\ncall _IO_DOALLOCATE and return without invoking the stream setbuf hook. \n\nChanges in v5:\n * Address coding-style comments following the GNU Coding Standards:\n - Drop unrelated style changes in existing libioP.h declarations.\n - Remove unnecessary casts for unused hook parameters.\n - Fix GNU comment spacing.\n\nChanges in v4:\n * Refactor the test cases in both patches by using libio/tst-memstream.h,\n so that the regression tests cover both open_memstream and\n open_wmemstream, as suggested by Andreas Schwab.\n * Use TEST_VERIFY_EXIT for pointer guard checks.\n * Fix typos.\n\nTested on x86_64-linux-gnu with no regression:\n make -j$(nproc) subdirs=libio check\n\n\nXiang Gao (2):\n libio: Ignore setbuf for open_memstream and open_wmemstream [BZ\n #34019]\n libio: Ignore doallocate for open_memstream and open_wmemstream [BZ\n #34019]\n\n libio/Makefile | 4 ++\n libio/libioP.h | 6 +++\n libio/memstream.c | 17 +++++++\n libio/tst-memstream-setbuf.c | 41 +++++++++++++++\n libio/tst-memstream-setvbuf-doallocate.c | 61 +++++++++++++++++++++++\n libio/tst-wmemstream-setbuf.c | 20 ++++++++\n libio/tst-wmemstream-setvbuf-doallocate.c | 20 ++++++++\n libio/vtables.c | 12 +++--\n libio/wmemstream.c | 17 +++++++\n 9 files changed, 194 insertions(+), 4 deletions(-)\n create mode 100644 libio/tst-memstream-setbuf.c\n create mode 100644 libio/tst-memstream-setvbuf-doallocate.c\n create mode 100644 libio/tst-wmemstream-setbuf.c\n create mode 100644 libio/tst-wmemstream-setvbuf-doallocate.c"}