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sourceware.org", "X-UUID": [ "0991dbda49f911f1aa26b74ffac11d73-20260507", "0991dbda49f911f1aa26b74ffac11d73-20260507" ], "X-CTIC-Tags": "HR_CC_COUNT, HR_CC_DOMAIN_COUNT, HR_CC_NAME, HR_CTE_8B,\n HR_CTT_MISS\n HR_DATE_H, HR_DATE_WKD, HR_DATE_ZONE, HR_FROM_NAME, HR_SJ_DIGIT_LEN\n HR_SJ_LANG, HR_SJ_LEN, HR_SJ_LETTER, HR_SJ_NOR_SYM, HR_SJ_PHRASE\n HR_SJ_PHRASE_LEN, HR_SJ_WS, HR_TO_COUNT, HR_TO_DOMAIN_COUNT, HR_TO_NO_NAME\n IP_UNTRUSTED, SRC_UNTRUSTED, IP_UNFAMILIAR, SRC_UNFAMILIAR, DN_TRUSTED\n SRC_TRUSTED, SA_EXISTED, SN_TRUSTED, SN_EXISTED, SPF_NOPASS\n DKIM_NOPASS, DMARC_NOPASS", "X-CID-O-RULE": "Release_Ham", "X-CID-RULE": "Release_Ham", "X-CID-O-INFO": "VERSION:1.3.12, REQID:2b9fd562-4f6d-442b-8f93-98d56fed4db9,\n IP:10,\n 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:2b9fd562-4f6d-442b-8f93-98d56fed4db9, 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:a6f3fead01e1ee8f40fb12e2a55ada85,\n BulkI\n D:26050717422070EKQ3NW,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 <gaoxiang@kylinos.cn>", "To": "libc-alpha@sourceware.org", "Cc": "Andreas Schwab <schwab@suse.de>,\n Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>,\n Rocket Ma <marocketbd@gmail.com>, Xiang Gao <gaoxiang@kylinos.cn>", "Subject": "[PATCH v4 0/2] libio: Keep memstream result buffers independent of\n setvbuf", "Date": "Thu, 7 May 2026 17:39:58 +0800", "Message-ID": "<20260507094000.22966-1-gaoxiang@kylinos.cn>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<mvm7bpg6cwr.fsf@suse.de>", "References": "<mvm7bpg6cwr.fsf@suse.de>", "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 <libc-alpha.sourceware.org>", "List-Unsubscribe": "<https://sourceware.org/mailman/options/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=unsubscribe>", "List-Archive": "<https://sourceware.org/pipermail/libc-alpha/>", "List-Post": "<mailto:libc-alpha@sourceware.org>", "List-Help": "<mailto:libc-alpha-request@sourceware.org?subject=help>", "List-Subscribe": "<https://sourceware.org/mailman/listinfo/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=subscribe>", "Errors-To": "libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org" }, "content": "From: Xiang Gao <gaoxiang@kylinos.cn>\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 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 | 15 ++++--\n libio/memstream.c | 20 ++++++++\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 | 20 ++++++++\n 9 files changed, 205 insertions(+), 8 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" }