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GET /api/patches/2218118/?format=api
{ "id": 2218118, "url": "http://patchwork.ozlabs.org/api/patches/2218118/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ltp/patch/20260331-nanosleep_posix_fix-v2-1-a0b72e6d586d@suse.com/", "project": { "id": 59, "url": "http://patchwork.ozlabs.org/api/projects/59/?format=api", "name": "Linux Test Project development", "link_name": "ltp", "list_id": "ltp.lists.linux.it", "list_email": "ltp@lists.linux.it", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260331-nanosleep_posix_fix-v2-1-a0b72e6d586d@suse.com>", "list_archive_url": null, "date": "2026-03-31T12:42:58", "name": "[v2] nanosleep: Use CLOCK_MONOTONIC for elapsed time measurement", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": false, "hash": "5982c8df2bd1e4c9a14eb1d53245d5eb1f063a25", "submitter": { "id": 83220, "url": "http://patchwork.ozlabs.org/api/people/83220/?format=api", "name": "Andrea Cervesato", "email": "andrea.cervesato@suse.de" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/ltp/patch/20260331-nanosleep_posix_fix-v2-1-a0b72e6d586d@suse.com/mbox/", "series": [ { "id": 498190, "url": "http://patchwork.ozlabs.org/api/series/498190/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ltp/list/?series=498190", "date": "2026-03-31T12:42:58", "name": "[v2] nanosleep: Use CLOCK_MONOTONIC for elapsed time measurement", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/498190/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2218118/comments/", "check": "success", "checks": "http://patchwork.ozlabs.org/api/patches/2218118/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "ltp@lists.linux.it" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "ltp@picard.linux.it" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=CkDu4bFx;\n\tdkim=fail reason=\"signature verification failed\" header.d=suse.de\n header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519\n header.b=5WwJo+sb;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key)\n header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa\n header.b=kUEYARGJ;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=6UB3uRbz;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=2001:1418:10:5::2; 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d=suse.de;\n s=susede2_rsa;\n t=1774960979;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n mime-version:mime-version:content-type:content-type:\n content-transfer-encoding:content-transfer-encoding;\n bh=2dZUmZMnw3F0IoY83OcmXK0joa1UAllf+kijxIg4BGw=;\n b=kUEYARGJ+1PQQQDlTjQKiHyxNDish1ZmYKyLPg+qkcq3PndQmL6e3jGV7UimQhAhjBQKL2\n XAUdCX/cm3wwWhul9RD3kEKBjjsw3r1NZ1VlIZ688cCPb+kIqtaM9ooi9M3L94aN4X0lN2\n kTgoboHMqtsA9/MabR6fK1OQ4QsxL3g=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_ed25519; t=1774960979;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n mime-version:mime-version:content-type:content-type:\n content-transfer-encoding:content-transfer-encoding;\n bh=2dZUmZMnw3F0IoY83OcmXK0joa1UAllf+kijxIg4BGw=;\n b=6UB3uRbzYWysU0KL4fwvIbO3GxU7h+2dtQEch+V98YwwCh7r/qiLimzzpVVxfFGgKqkMFG\n DJfH3ENx4KI4d2Cw==" ], "From": "Andrea Cervesato <andrea.cervesato@suse.de>", "Date": "Tue, 31 Mar 2026 14:42:58 +0200", "MIME-Version": "1.0", "Message-Id": "<20260331-nanosleep_posix_fix-v2-1-a0b72e6d586d@suse.com>", "X-B4-Tracking": "v=1; 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FUZZY_RATELIMITED(0.00)[rspamd.com];\n RCVD_TLS_ALL(0.00)[];\n DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n TO_DN_ALL(0.00)[]; FROM_HAS_DN(0.00)[];\n RCPT_COUNT_THREE(0.00)[3]; FROM_EQ_ENVFROM(0.00)[];\n TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2];\n DBL_BLOCKED_OPENRESOLVER(0.00)[anthropic.com:email, suse.com:mid,\n suse.com:email, imap1.dmz-prg2.suse.org:helo]", "X-Spam-Score": "-4.30", "X-Spam-Level": "", "X-Spam-Status": "No, score=0.1 required=7.0 tests=DKIM_SIGNED,DKIM_VALID,\n DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS shortcircuit=no\n autolearn=disabled version=4.0.1", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on in-6.smtp.seeweb.it", "X-Virus-Scanned": "clamav-milter 1.0.9 at in-6.smtp.seeweb.it", "X-Virus-Status": "Clean", "Subject": "[LTP] [PATCH v2] nanosleep: Use CLOCK_MONOTONIC for elapsed time\n measurement", "X-BeenThere": "ltp@lists.linux.it", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "Linux Test Project <ltp.lists.linux.it>", "List-Unsubscribe": "<https://lists.linux.it/options/ltp>,\n <mailto:ltp-request@lists.linux.it?subject=unsubscribe>", "List-Archive": "<http://lists.linux.it/pipermail/ltp/>", "List-Post": "<mailto:ltp@lists.linux.it>", "List-Help": "<mailto:ltp-request@lists.linux.it?subject=help>", "List-Subscribe": "<https://lists.linux.it/listinfo/ltp>,\n <mailto:ltp-request@lists.linux.it?subject=subscribe>", "Cc": "Claude <noreply@anthropic.com>", "Content-Type": "text/plain; charset=\"us-ascii\"", "Content-Transfer-Encoding": "7bit", "Errors-To": "ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it", "Sender": "\"ltp\" <ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it>" }, "content": "From: Andrea Cervesato <andrea.cervesato@suse.com>\n\nAll nanosleep POSIX conformance tests used CLOCK_REALTIME to measure\nelapsed sleep duration. CLOCK_REALTIME can jump due to NTP corrections,\nVM time sync, or other wall-clock adjustments, causing sporadic test\nfailures where measured time far exceeds expected sleep duration.\n\nSwitch to CLOCK_MONOTONIC which is immune to wall-clock changes and is\nthe correct clock for measuring elapsed durations. Guard with\n_POSIX_MONOTONIC_CLOCK and fall back to CLOCK_REALTIME with a warning\non systems where CLOCK_MONOTONIC is unavailable.\n\nCo-authored-by: Claude <noreply@anthropic.com>\nSigned-off-by: Andrea Cervesato <andrea.cervesato@suse.com>\n---\nChanges in v2:\n- introduce TEST_CLOCK to select the right available clock type\n- print a message in case CLOCK_MONOTONIC is not available\n- Link to v1: https://lore.kernel.org/r/20260331-nanosleep_posix_fix-v1-1-7a707f871582@suse.com\n---\n .../conformance/interfaces/nanosleep/1-1.c | 14 ++++++++++++--\n .../conformance/interfaces/nanosleep/1-2.c | 14 ++++++++++++--\n .../conformance/interfaces/nanosleep/1-3.c | 14 ++++++++++++--\n .../conformance/interfaces/nanosleep/10000-1.c | 14 ++++++++++++--\n .../conformance/interfaces/nanosleep/2-1.c | 14 ++++++++++++--\n .../conformance/interfaces/nanosleep/3-2.c | 14 ++++++++++++--\n .../conformance/interfaces/nanosleep/7-2.c | 14 ++++++++++++--\n 7 files changed, 84 insertions(+), 14 deletions(-)\n\n\n---\nbase-commit: 4688c20c01eece869b59e05ca3dd68c43e0d6af7\nchange-id: 20260331-nanosleep_posix_fix-66162acca1ed\n\nBest regards,", "diff": "diff --git a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/1-1.c b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/1-1.c\nindex 687d01e288d914fbbdc18287746f71296c7a4327..75b34346f13d9b62e2333dbc78023a812fc9c908 100644\n--- a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/1-1.c\n+++ b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/1-1.c\n@@ -12,13 +12,23 @@\n #include <time.h>\n #include \"posixtest.h\"\n \n+#ifdef _POSIX_MONOTONIC_CLOCK\n+#define TEST_CLOCK CLOCK_MONOTONIC\n+#else\n+#define TEST_CLOCK CLOCK_REALTIME\n+#endif\n+\n int main(void)\n {\n \tstruct timespec tssleepfor, tsstorage, tsbefore, tsafter;\n \tint sleepnsec = 3;\n \tint slepts = 0, sleptns = 0;\n \n-\tif (clock_gettime(CLOCK_REALTIME, &tsbefore) == -1) {\n+#ifndef _POSIX_MONOTONIC_CLOCK\n+\tprintf(\"CLOCK_MONOTONIC unavailable, test may fail due to external clock adjustments\\n\");\n+#endif\n+\n+\tif (clock_gettime(TEST_CLOCK, &tsbefore) == -1) {\n \t\tperror(\"Error in clock_gettime()\\n\");\n \t\treturn PTS_UNRESOLVED;\n \t}\n@@ -30,7 +40,7 @@ int main(void)\n \t\treturn PTS_UNRESOLVED;\n \t}\n \n-\tif (clock_gettime(CLOCK_REALTIME, &tsafter) == -1) {\n+\tif (clock_gettime(TEST_CLOCK, &tsafter) == -1) {\n \t\tperror(\"Error in clock_gettime()\\n\");\n \t\treturn PTS_UNRESOLVED;\n \t}\ndiff --git a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/1-2.c b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/1-2.c\nindex 76f31982508dc87a4f400022cd46fe766071f27d..4a38bd507bba47792b942feb53954b95e92dc222 100644\n--- a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/1-2.c\n+++ b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/1-2.c\n@@ -15,13 +15,23 @@\n #include <sys/wait.h>\n #include \"posixtest.h\"\n \n+#ifdef _POSIX_MONOTONIC_CLOCK\n+#define TEST_CLOCK CLOCK_MONOTONIC\n+#else\n+#define TEST_CLOCK CLOCK_REALTIME\n+#endif\n+\n int main(void)\n {\n \tstruct timespec tssleepfor, tsstorage, tsbefore, tsafter;\n \tint sleepsec = 30;\n \tint pid;\n \n-\tif (clock_gettime(CLOCK_REALTIME, &tsbefore) == -1) {\n+#ifndef _POSIX_MONOTONIC_CLOCK\n+\tprintf(\"CLOCK_MONOTONIC unavailable, test may fail due to external clock adjustments\\n\");\n+#endif\n+\n+\tif (clock_gettime(TEST_CLOCK, &tsbefore) == -1) {\n \t\tperror(\"Error in clock_gettime()\\n\");\n \t\treturn PTS_UNRESOLVED;\n \t}\n@@ -46,7 +56,7 @@ int main(void)\n \t\t\tperror(\"Error waiting for child to exit\\n\");\n \t\t\treturn PTS_UNRESOLVED;\n \t\t}\n-\t\tif (clock_gettime(CLOCK_REALTIME, &tsafter) == -1) {\n+\t\tif (clock_gettime(TEST_CLOCK, &tsafter) == -1) {\n \t\t\tperror(\"Error in clock_gettime()\\n\");\n \t\t\treturn PTS_UNRESOLVED;\n \t\t}\ndiff --git a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/1-3.c b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/1-3.c\nindex 31ac00858018c3741758d0b5f2bf28f87aa6c1bf..7d5600788d6bc4682f228ccc7c669576827c397a 100644\n--- a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/1-3.c\n+++ b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/1-3.c\n@@ -16,6 +16,12 @@\n #include <sys/wait.h>\n #include \"posixtest.h\"\n \n+#ifdef _POSIX_MONOTONIC_CLOCK\n+#define TEST_CLOCK CLOCK_MONOTONIC\n+#else\n+#define TEST_CLOCK CLOCK_REALTIME\n+#endif\n+\n static void handler(int signo PTS_ATTRIBUTE_UNUSED)\n {\n \tprintf(\"In handler\\n\");\n@@ -28,7 +34,11 @@ int main(void)\n \tint pid;\n \tstruct sigaction act;\n \n-\tif (clock_gettime(CLOCK_REALTIME, &tsbefore) == -1) {\n+#ifndef _POSIX_MONOTONIC_CLOCK\n+\tprintf(\"CLOCK_MONOTONIC unavailable, test may fail due to external clock adjustments\\n\");\n+#endif\n+\n+\tif (clock_gettime(TEST_CLOCK, &tsbefore) == -1) {\n \t\tperror(\"Error in clock_gettime()\\n\");\n \t\treturn PTS_UNRESOLVED;\n \t}\n@@ -64,7 +74,7 @@ int main(void)\n \t\t\tperror(\"Error waiting for child to exit\\n\");\n \t\t\treturn PTS_UNRESOLVED;\n \t\t}\n-\t\tif (clock_gettime(CLOCK_REALTIME, &tsafter) == -1) {\n+\t\tif (clock_gettime(TEST_CLOCK, &tsafter) == -1) {\n \t\t\tperror(\"Error in clock_gettime()\\n\");\n \t\t\treturn PTS_UNRESOLVED;\n \t\t}\ndiff --git a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/10000-1.c b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/10000-1.c\nindex 883885df434fb4ba3bb555dd565880f14623a984..ebcf366acb52fd149f19951a6e4e0764bd503807 100644\n--- a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/10000-1.c\n+++ b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/10000-1.c\n@@ -19,6 +19,12 @@\n #include <errno.h>\n #include \"posixtest.h\"\n \n+#ifdef _POSIX_MONOTONIC_CLOCK\n+#define TEST_CLOCK CLOCK_MONOTONIC\n+#else\n+#define TEST_CLOCK CLOCK_REALTIME\n+#endif\n+\n #define NUMVALID 6\n #define NUMINVALID 7\n \n@@ -51,18 +57,22 @@ int main(void)\n \tint failure = 0;\n \tint slepts = 0, sleptns = 0;\n \n+#ifndef _POSIX_MONOTONIC_CLOCK\n+\tprintf(\"CLOCK_MONOTONIC unavailable, test may fail due to external clock adjustments\\n\");\n+#endif\n+\n \tfor (i = 0; i < NUMVALID; i++) {\n \t\ttssleepfor.tv_sec = sleepvalid[i][0];\n \t\ttssleepfor.tv_nsec = sleepvalid[i][1];\n \t\tprintf(\"sleep %d sec %d nsec\\n\",\n \t\t (int)tssleepfor.tv_sec, (int)tssleepfor.tv_nsec);\n-\t\tif (clock_gettime(CLOCK_REALTIME, &tsbefore) == -1) {\n+\t\tif (clock_gettime(TEST_CLOCK, &tsbefore) == -1) {\n \t\t\tperror(\"Error in clock_gettime()\\n\");\n \t\t\treturn PTS_UNRESOLVED;\n \t\t}\n \n \t\tif (nanosleep(&tssleepfor, &tsstorage) == 0) {\n-\t\t\tif (clock_gettime(CLOCK_REALTIME, &tsafter) == -1) {\n+\t\t\tif (clock_gettime(TEST_CLOCK, &tsafter) == -1) {\n \t\t\t\tperror(\"Error in clock_gettime()\\n\");\n \t\t\t\treturn PTS_UNRESOLVED;\n \t\t\t}\ndiff --git a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/2-1.c b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/2-1.c\nindex cce3941e7be7212ea286647ec601d3ecbb9bb85a..8586e0ecec023029b60bce8ad5e1e72206daee34 100644\n--- a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/2-1.c\n+++ b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/2-1.c\n@@ -13,6 +13,12 @@\n #include <time.h>\n #include \"posixtest.h\"\n \n+#ifdef _POSIX_MONOTONIC_CLOCK\n+#define TEST_CLOCK CLOCK_MONOTONIC\n+#else\n+#define TEST_CLOCK CLOCK_REALTIME\n+#endif\n+\n #define NUMINTERVALS 13\n int main(void)\n {\n@@ -25,7 +31,11 @@ int main(void)\n \tint failure = 0;\n \tint slepts, sleptns;\n \n-\tif (clock_gettime(CLOCK_REALTIME, &tsbefore) == -1) {\n+#ifndef _POSIX_MONOTONIC_CLOCK\n+\tprintf(\"CLOCK_MONOTONIC unavailable, test may fail due to external clock adjustments\\n\");\n+#endif\n+\n+\tif (clock_gettime(TEST_CLOCK, &tsbefore) == -1) {\n \t\tperror(\"Error in clock_gettime()\\n\");\n \t\treturn PTS_UNRESOLVED;\n \t}\n@@ -38,7 +48,7 @@ int main(void)\n \t\t\treturn PTS_UNRESOLVED;\n \t\t}\n \n-\t\tif (clock_gettime(CLOCK_REALTIME, &tsafter) == -1) {\n+\t\tif (clock_gettime(TEST_CLOCK, &tsafter) == -1) {\n \t\t\tperror(\"Error in clock_gettime()\\n\");\n \t\t\treturn PTS_UNRESOLVED;\n \t\t}\ndiff --git a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/3-2.c b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/3-2.c\nindex bfc271edf25f9cd0f343eef11b335d5da20eb646..1329a7e988055ed3815e4e4037f331f576264d1a 100644\n--- a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/3-2.c\n+++ b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/3-2.c\n@@ -16,6 +16,12 @@\n #include <stdlib.h>\n #include \"posixtest.h\"\n \n+#ifdef _POSIX_MONOTONIC_CLOCK\n+#define TEST_CLOCK CLOCK_MONOTONIC\n+#else\n+#define TEST_CLOCK CLOCK_REALTIME\n+#endif\n+\n #define SLEEPSEC 5\n \n #define CHILDPASS 0\t\t//if interrupted, child will return 0\n@@ -26,7 +32,11 @@ int main(void)\n \tint pid, slepts;\n \tstruct timespec tsbefore, tsafter;\n \n-\tif (clock_gettime(CLOCK_REALTIME, &tsbefore) != 0) {\n+#ifndef _POSIX_MONOTONIC_CLOCK\n+\tprintf(\"CLOCK_MONOTONIC unavailable, test may fail due to external clock adjustments\\n\");\n+#endif\n+\n+\tif (clock_gettime(TEST_CLOCK, &tsbefore) != 0) {\n \t\tperror(\"clock_gettime() did not return success\\n\");\n \t\treturn PTS_UNRESOLVED;\n \t}\n@@ -74,7 +84,7 @@ int main(void)\n \t\t\treturn PTS_FAIL;\n \t\t}\n \n-\t\tif (clock_gettime(CLOCK_REALTIME, &tsafter) == -1) {\n+\t\tif (clock_gettime(TEST_CLOCK, &tsafter) == -1) {\n \t\t\tperror(\"Error in clock_gettime()\\n\");\n \t\t\treturn PTS_UNRESOLVED;\n \t\t}\ndiff --git a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/7-2.c b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/7-2.c\nindex caf4470e4a26b27ec79deed27c147e2feceffdf8..70eeca9ff8eb10ac052b81f102853747a5066685 100644\n--- a/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/7-2.c\n+++ b/testcases/open_posix_testsuite/conformance/interfaces/nanosleep/7-2.c\n@@ -17,6 +17,12 @@\n #include <stdlib.h>\n #include \"posixtest.h\"\n \n+#ifdef _POSIX_MONOTONIC_CLOCK\n+#define TEST_CLOCK CLOCK_MONOTONIC\n+#else\n+#define TEST_CLOCK CLOCK_REALTIME\n+#endif\n+\n #define CHILDSUCCESS 1\n #define CHILDFAILURE 0\n \n@@ -34,7 +40,11 @@ int main(void)\n \tint pid;\n \tstruct sigaction act;\n \n-\tif (clock_gettime(CLOCK_REALTIME, &tsbefore) == -1) {\n+#ifndef _POSIX_MONOTONIC_CLOCK\n+\tprintf(\"CLOCK_MONOTONIC unavailable, test may fail due to external clock adjustments\\n\");\n+#endif\n+\n+\tif (clock_gettime(TEST_CLOCK, &tsbefore) == -1) {\n \t\tperror(\"Error in clock_gettime()\\n\");\n \t\treturn PTS_UNRESOLVED;\n \t}\n@@ -60,7 +70,7 @@ int main(void)\n \t\t\treturn CHILDFAILURE;\n \t\t}\n \n-\t\tif (clock_gettime(CLOCK_REALTIME, &tsafter) == -1) {\n+\t\tif (clock_gettime(TEST_CLOCK, &tsafter) == -1) {\n \t\t\tperror(\"Error in clock_gettime()\\n\");\n \t\t\treturn CHILDFAILURE;\n \t\t}\n", "prefixes": [ "v2" ] }