{"id":2227292,"url":"http://patchwork.ozlabs.org/api/patches/2227292/?format=json","web_url":"http://patchwork.ozlabs.org/project/ltp/patch/20260423120309.18049-4-chrubis@suse.cz/","project":{"id":59,"url":"http://patchwork.ozlabs.org/api/projects/59/?format=json","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":"<20260423120309.18049-4-chrubis@suse.cz>","list_archive_url":null,"date":"2026-04-23T12:03:04","name":"[v2,3/8] syscalls: Add epoll_wait09","commit_ref":null,"pull_url":null,"state":"needs-review-ack","archived":false,"hash":"6a8f3ec09624d37f69cebfded8bd679cbe3d168e","submitter":{"id":8530,"url":"http://patchwork.ozlabs.org/api/people/8530/?format=json","name":"Cyril Hrubis","email":"chrubis@suse.cz"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/ltp/patch/20260423120309.18049-4-chrubis@suse.cz/mbox/","series":[{"id":501188,"url":"http://patchwork.ozlabs.org/api/series/501188/?format=json","web_url":"http://patchwork.ozlabs.org/project/ltp/list/?series=501188","date":"2026-04-23T12:03:01","name":"Add more epoll tests","version":2,"mbox":"http://patchwork.ozlabs.org/series/501188/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2227292/comments/","check":"warning","checks":"http://patchwork.ozlabs.org/api/patches/2227292/checks/","tags":{},"related":[],"headers":{"Return-Path":"","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.cz header.i=@suse.cz header.a=rsa-sha256\n header.s=susede2_rsa header.b=oBXk2cwT;\n\tdkim=fail reason=\"signature verification failed\" header.d=suse.cz\n header.i=@suse.cz header.a=ed25519-sha256 header.s=susede2_ed25519\n header.b=GMyc+060;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key)\n header.d=suse.cz header.i=@suse.cz header.a=rsa-sha256 header.s=susede2_rsa\n header.b=oBXk2cwT;\n\tdkim=neutral header.d=suse.cz header.i=@suse.cz header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=GMyc+060;\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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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "},"content":"Test checks that events from recursive epoll are propagated correctly.\n\nSigned-off-by: Cyril Hrubis \n---\n runtest/syscalls | 1 +\n .../kernel/syscalls/epoll_wait/.gitignore | 1 +\n .../kernel/syscalls/epoll_wait/epoll_wait09.c | 132 ++++++++++++++++++\n 3 files changed, 134 insertions(+)\n create mode 100644 testcases/kernel/syscalls/epoll_wait/epoll_wait09.c","diff":"diff --git a/runtest/syscalls b/runtest/syscalls\nindex 99cdd1db8..569e8bbe4 100644\n--- a/runtest/syscalls\n+++ b/runtest/syscalls\n@@ -196,6 +196,7 @@ epoll_wait05 epoll_wait05\n epoll_wait06 epoll_wait06\n epoll_wait07 epoll_wait07\n epoll_wait08 epoll_wait08\n+epoll_wait09 epoll_wait09\n \n epoll_pwait01 epoll_pwait01\n epoll_pwait02 epoll_pwait02\ndiff --git a/testcases/kernel/syscalls/epoll_wait/.gitignore b/testcases/kernel/syscalls/epoll_wait/.gitignore\nindex f3b208950..f32ec535b 100644\n--- a/testcases/kernel/syscalls/epoll_wait/.gitignore\n+++ b/testcases/kernel/syscalls/epoll_wait/.gitignore\n@@ -6,3 +6,4 @@ epoll_wait05\n epoll_wait06\n epoll_wait07\n epoll_wait08\n+epoll_wait09\ndiff --git a/testcases/kernel/syscalls/epoll_wait/epoll_wait09.c b/testcases/kernel/syscalls/epoll_wait/epoll_wait09.c\nnew file mode 100644\nindex 000000000..790690884\n--- /dev/null\n+++ b/testcases/kernel/syscalls/epoll_wait/epoll_wait09.c\n@@ -0,0 +1,132 @@\n+// SPDX-License-Identifier: GPL-2.0-or-later\n+/*\n+ * Copyright (c) 2026 Cyril Hrubis \n+ */\n+\n+/*\\\n+ * Verify that epoll_wait works with nested epoll instances up to the maximum\n+ * nesting depth of 5 allowed by the kernel (EP_MAX_NESTS).\n+ *\n+ * [Algorithm]\n+ *\n+ * - Create a pipe.\n+ * - Build a chain of epoll instances of the given depth where the innermost\n+ * monitors the pipe read end and each subsequent one monitors the previous.\n+ * - Write data to the pipe.\n+ * - Call epoll_wait on the outermost epoll instance and verify it reports\n+ * EPOLLIN.\n+ * - Walk the chain inward calling epoll_wait on each level and verify that\n+ * every level reports EPOLLIN on the expected fd.\n+ * - Read the data from the pipe to drain it.\n+ */\n+\n+#include \n+\n+#include \"tst_epoll.h\"\n+#include \"tst_test.h\"\n+\n+#define MAX_DEPTH 5\n+\n+static int epfds[MAX_DEPTH];\n+static int fds[2] = {-1, -1};\n+\n+static struct tcase {\n+\tint depth;\n+} tcases[] = {\n+\t{2},\n+\t{3},\n+\t{4},\n+\t{5},\n+};\n+\n+static void run(unsigned int n)\n+{\n+\tstruct tcase *tc = &tcases[n];\n+\tstruct epoll_event ev;\n+\tint prev_fd, i;\n+\tchar buf;\n+\n+\tprev_fd = fds[0];\n+\n+\tfor (i = 0; i < tc->depth; i++) {\n+\t\tepfds[i] = SAFE_EPOLL_CREATE1(0);\n+\n+\t\tev.events = EPOLLIN;\n+\t\tev.data.fd = prev_fd;\n+\n+\t\tSAFE_EPOLL_CTL(epfds[i], EPOLL_CTL_ADD, prev_fd, &ev);\n+\n+\t\tprev_fd = epfds[i];\n+\t}\n+\n+\tSAFE_WRITE(SAFE_WRITE_ALL, fds[1], \"x\", 1);\n+\n+\t/* Walk from outermost to innermost verifying each level */\n+\tfor (i = tc->depth - 1; i >= 0; i--) {\n+\t\tint expected_fd = (i > 0) ? epfds[i - 1] : fds[0];\n+\n+\t\tTEST(epoll_wait(epfds[i], &ev, 1, 1000));\n+\t\tif (TST_RET != 1) {\n+\t\t\ttst_res(TFAIL | TTERRNO,\n+\t\t\t\t\"depth %d/%d: epoll_wait() returned %li, expected 1\",\n+\t\t\t\ttc->depth - i, tc->depth, TST_RET);\n+\t\t\tgoto end;\n+\t\t}\n+\n+\t\tif (ev.data.fd != expected_fd) {\n+\t\t\ttst_res(TFAIL,\n+\t\t\t\t\"depth %d/%d: data.fd %d, expected %d\",\n+\t\t\t\ttc->depth - i, tc->depth,\n+\t\t\t\tev.data.fd, expected_fd);\n+\t\t\tgoto end;\n+\t\t}\n+\n+\t\tif (!(ev.events & EPOLLIN)) {\n+\t\t\ttst_res(TFAIL,\n+\t\t\t\t\"depth %d/%d: events %x, expected EPOLLIN\",\n+\t\t\t\ttc->depth - i, tc->depth, ev.events);\n+\t\t\tgoto end;\n+\t\t}\n+\t}\n+\n+\ttst_res(TPASS, \"epoll_wait() with %d nested levels\", tc->depth);\n+\n+end:\n+\tSAFE_READ(1, fds[0], &buf, 1);\n+\n+\tfor (i = tc->depth - 1; i >= 0; i--) {\n+\t\tif (epfds[i] != -1)\n+\t\t\tSAFE_CLOSE(epfds[i]);\n+\t}\n+\n+}\n+\n+static void setup(void)\n+{\n+\tint i;\n+\n+\tfor (i = 0; i < MAX_DEPTH; i++)\n+\t\tepfds[i] = -1;\n+\n+\tSAFE_PIPE(fds);\n+}\n+\n+static void cleanup(void)\n+{\n+\tint i;\n+\n+\tfor (i = 0; i < MAX_DEPTH; i++) {\n+\t\tif (epfds[i] != -1)\n+\t\t\tSAFE_CLOSE(epfds[i]);\n+\t}\n+\n+\tSAFE_CLOSE(fds[0]);\n+\tSAFE_CLOSE(fds[1]);\n+}\n+\n+static struct tst_test test = {\n+\t.test = run,\n+\t.setup = setup,\n+\t.cleanup = cleanup,\n+\t.tcnt = ARRAY_SIZE(tcases),\n+};\n","prefixes":["v2","3/8"]}