94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2022 FUJITSU LIMITED. All rights reserved.
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* Author: Yang Xu <xuyang2018.jy@fujitsu.com>
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*/
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/*\
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* [Description]
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*
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* Verify that the PIDFD_NONBLOCK flag works with pidfd_open() and
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* that waitid() with a non-blocking pidfd returns EAGAIN.
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*/
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#include <unistd.h>
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#include <sys/wait.h>
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#include <stdlib.h>
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#include "tst_test.h"
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#include "lapi/pidfd.h"
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#ifndef P_PIDFD
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#define P_PIDFD 3
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#endif
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static int pidfd = -1;
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static void run(void)
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{
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int flag, pid, ret;
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siginfo_t info;
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pid = SAFE_FORK();
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if (!pid) {
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TST_CHECKPOINT_WAIT(0);
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exit(EXIT_SUCCESS);
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}
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TST_EXP_FD_SILENT(pidfd_open(pid, PIDFD_NONBLOCK),
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"pidfd_open(%d, PIDFD_NONBLOCK)", pid);
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pidfd = TST_RET;
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flag = SAFE_FCNTL(pidfd, F_GETFL);
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if (!(flag & O_NONBLOCK))
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tst_brk(TFAIL, "pidfd_open(%d, O_NONBLOCK) didn't set O_NONBLOCK flag", pid);
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tst_res(TPASS, "pidfd_open(%d, O_NONBLOCK) sets O_NONBLOCK flag", pid);
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TST_EXP_FAIL(waitid(P_PIDFD, pidfd, &info, WEXITED), EAGAIN,
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"waitid(P_PIDFD,...,WEXITED)");
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TST_CHECKPOINT_WAKE(0);
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ret = TST_RETRY_FUNC(waitid(P_PIDFD, pidfd, &info, WEXITED), TST_RETVAL_EQ0);
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if (ret == 0) {
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tst_res(TPASS, "waitid(P_PIDFD) succeeded after child process terminated");
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} else {
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tst_res(TFAIL, "waitid(P_PIDFD) failed after child process terminated");
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SAFE_WAIT(NULL);
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}
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SAFE_CLOSE(pidfd);
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}
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static void setup(void)
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{
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pidfd_open_supported();
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TEST(pidfd_open(getpid(), PIDFD_NONBLOCK));
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if (TST_RET == -1) {
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if (TST_ERR == EINVAL) {
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tst_brk(TCONF, "PIDFD_NONBLOCK was supported since linux 5.10");
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return;
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}
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tst_brk(TFAIL | TTERRNO,
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"pidfd_open(getpid(),PIDFD_NONBLOCK) failed unexpectedly");
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}
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SAFE_CLOSE(TST_RET);
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}
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static void cleanup(void)
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{
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if (pidfd > -1)
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SAFE_CLOSE(pidfd);
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}
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static struct tst_test test = {
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.needs_root = 1,
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.forks_child = 1,
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.needs_checkpoints = 1,
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.setup = setup,
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.cleanup = cleanup,
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.test_all = run,
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};
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