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MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.998]; MIME_GOOD(-0.10)[text/plain]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; DBL_BLOCKED_OPENRESOLVER(0.00)[ev.events:url,suse.cz:mid,suse.cz:email]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[ltp@lists.linux.it]; RCVD_TLS_ALL(0.00)[] X-Virus-Scanned: clamav-milter 1.0.9 at in-4.smtp.seeweb.it X-Virus-Status: Clean Subject: [LTP] [PATCH v2 3/8] syscalls: Add epoll_wait09 X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Test checks that events from recursive epoll are propagated correctly. Signed-off-by: Cyril Hrubis --- runtest/syscalls | 1 + .../kernel/syscalls/epoll_wait/.gitignore | 1 + .../kernel/syscalls/epoll_wait/epoll_wait09.c | 132 ++++++++++++++++++ 3 files changed, 134 insertions(+) create mode 100644 testcases/kernel/syscalls/epoll_wait/epoll_wait09.c diff --git a/runtest/syscalls b/runtest/syscalls index 99cdd1db8..569e8bbe4 100644 --- a/runtest/syscalls +++ b/runtest/syscalls @@ -196,6 +196,7 @@ epoll_wait05 epoll_wait05 epoll_wait06 epoll_wait06 epoll_wait07 epoll_wait07 epoll_wait08 epoll_wait08 +epoll_wait09 epoll_wait09 epoll_pwait01 epoll_pwait01 epoll_pwait02 epoll_pwait02 diff --git a/testcases/kernel/syscalls/epoll_wait/.gitignore b/testcases/kernel/syscalls/epoll_wait/.gitignore index f3b208950..f32ec535b 100644 --- a/testcases/kernel/syscalls/epoll_wait/.gitignore +++ b/testcases/kernel/syscalls/epoll_wait/.gitignore @@ -6,3 +6,4 @@ epoll_wait05 epoll_wait06 epoll_wait07 epoll_wait08 +epoll_wait09 diff --git a/testcases/kernel/syscalls/epoll_wait/epoll_wait09.c b/testcases/kernel/syscalls/epoll_wait/epoll_wait09.c new file mode 100644 index 000000000..790690884 --- /dev/null +++ b/testcases/kernel/syscalls/epoll_wait/epoll_wait09.c @@ -0,0 +1,132 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2026 Cyril Hrubis + */ + +/*\ + * Verify that epoll_wait works with nested epoll instances up to the maximum + * nesting depth of 5 allowed by the kernel (EP_MAX_NESTS). + * + * [Algorithm] + * + * - Create a pipe. + * - Build a chain of epoll instances of the given depth where the innermost + * monitors the pipe read end and each subsequent one monitors the previous. + * - Write data to the pipe. + * - Call epoll_wait on the outermost epoll instance and verify it reports + * EPOLLIN. + * - Walk the chain inward calling epoll_wait on each level and verify that + * every level reports EPOLLIN on the expected fd. + * - Read the data from the pipe to drain it. + */ + +#include + +#include "tst_epoll.h" +#include "tst_test.h" + +#define MAX_DEPTH 5 + +static int epfds[MAX_DEPTH]; +static int fds[2] = {-1, -1}; + +static struct tcase { + int depth; +} tcases[] = { + {2}, + {3}, + {4}, + {5}, +}; + +static void run(unsigned int n) +{ + struct tcase *tc = &tcases[n]; + struct epoll_event ev; + int prev_fd, i; + char buf; + + prev_fd = fds[0]; + + for (i = 0; i < tc->depth; i++) { + epfds[i] = SAFE_EPOLL_CREATE1(0); + + ev.events = EPOLLIN; + ev.data.fd = prev_fd; + + SAFE_EPOLL_CTL(epfds[i], EPOLL_CTL_ADD, prev_fd, &ev); + + prev_fd = epfds[i]; + } + + SAFE_WRITE(SAFE_WRITE_ALL, fds[1], "x", 1); + + /* Walk from outermost to innermost verifying each level */ + for (i = tc->depth - 1; i >= 0; i--) { + int expected_fd = (i > 0) ? epfds[i - 1] : fds[0]; + + TEST(epoll_wait(epfds[i], &ev, 1, 1000)); + if (TST_RET != 1) { + tst_res(TFAIL | TTERRNO, + "depth %d/%d: epoll_wait() returned %li, expected 1", + tc->depth - i, tc->depth, TST_RET); + goto end; + } + + if (ev.data.fd != expected_fd) { + tst_res(TFAIL, + "depth %d/%d: data.fd %d, expected %d", + tc->depth - i, tc->depth, + ev.data.fd, expected_fd); + goto end; + } + + if (!(ev.events & EPOLLIN)) { + tst_res(TFAIL, + "depth %d/%d: events %x, expected EPOLLIN", + tc->depth - i, tc->depth, ev.events); + goto end; + } + } + + tst_res(TPASS, "epoll_wait() with %d nested levels", tc->depth); + +end: + SAFE_READ(1, fds[0], &buf, 1); + + for (i = tc->depth - 1; i >= 0; i--) { + if (epfds[i] != -1) + SAFE_CLOSE(epfds[i]); + } + +} + +static void setup(void) +{ + int i; + + for (i = 0; i < MAX_DEPTH; i++) + epfds[i] = -1; + + SAFE_PIPE(fds); +} + +static void cleanup(void) +{ + int i; + + for (i = 0; i < MAX_DEPTH; i++) { + if (epfds[i] != -1) + SAFE_CLOSE(epfds[i]); + } + + SAFE_CLOSE(fds[0]); + SAFE_CLOSE(fds[1]); +} + +static struct tst_test test = { + .test = run, + .setup = setup, + .cleanup = cleanup, + .tcnt = ARRAY_SIZE(tcases), +}; -- 2.52.0 -- Mailing list info: https://lists.linux.it/listinfo/ltp