72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) Linux Test Project, 2021
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* Author: Xie Ziyao <ziyaoxie@outlook.com>
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*/
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/*\
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* [Description]
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*
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* Verify that epoll_ctl() fails with ELOOP if fd refers to an epoll instance
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* and this EPOLL_CTL_ADD operation would result in a circular loop of epoll
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* instances monitoring one another.
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*/
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#include <poll.h>
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#include <sys/epoll.h>
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#include "tst_test.h"
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#define MAX_DEPTH 5
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static int epfd, origin_epfd, new_epfd;
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static int fd[2];
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static struct epoll_event events = {.events = EPOLLIN};
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static void setup(void)
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{
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int i;
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SAFE_PIPE(fd);
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for (i = 0, epfd = fd[0]; i < MAX_DEPTH; i++, epfd = new_epfd) {
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new_epfd = epoll_create(1);
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if (new_epfd == -1)
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tst_brk(TBROK | TERRNO, "fail to create epoll instance");
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if (i == 0)
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origin_epfd = new_epfd;
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events.data.fd = epfd;
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if (epoll_ctl(new_epfd, EPOLL_CTL_ADD, epfd, &events))
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tst_brk(TBROK | TERRNO, "epoll_clt(..., EPOLL_CTL_ADD, ...)");
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}
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events.data.fd = fd[0];
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if (epoll_ctl(origin_epfd, EPOLL_CTL_DEL, fd[0], &events))
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tst_brk(TBROK | TERRNO, "epoll_clt(..., EPOLL_CTL_DEL, ...)");
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}
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static void cleanup(void)
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{
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if (fd[0])
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SAFE_CLOSE(fd[0]);
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if (fd[1])
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SAFE_CLOSE(fd[1]);
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}
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static void verify_epoll_ctl(void)
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{
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events.data.fd = epfd;
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TST_EXP_FAIL(epoll_ctl(origin_epfd, EPOLL_CTL_ADD, epfd, &events),
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ELOOP, "epoll_clt(..., EPOLL_CTL_ADD, ...)");
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}
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static struct tst_test test = {
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.setup = setup,
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.cleanup = cleanup,
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.test_all = verify_epoll_ctl,
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};
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