69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Copyright (c) Matthew Wilcox for Hewlett Packard 2003
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* Author: Matthew Wilcox
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*
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* Test Description:
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* This test verifies that flock locks held on one fd conflict with flock
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* locks held on a different fd.
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*
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* Test Steps:
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* The process opens two file descriptors on the same file. It acquires
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* an exclusive flock on the first descriptor, checks that attempting to
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* acquire an flock on the second descriptor fails. Then it removes the
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* first descriptor's lock and attempts to acquire an exclusive lock on
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* the second descriptor.
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*/
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#include <errno.h>
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#include <sys/file.h>
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#include "tst_test.h"
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static void verify_flock(void)
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{
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int fd1, fd2;
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fd1 = SAFE_OPEN("testfile", O_RDWR);
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TEST(flock(fd1, LOCK_EX | LOCK_NB));
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if (TST_RET != 0)
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tst_res(TFAIL | TTERRNO, "First attempt to flock() failed");
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else
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tst_res(TPASS, "First attempt to flock() passed");
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fd2 = SAFE_OPEN("testfile", O_RDWR);
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TEST(flock(fd2, LOCK_EX | LOCK_NB));
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if (TST_RET == -1)
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tst_res(TPASS | TTERRNO, "Second attempt to flock() denied");
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else
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tst_res(TFAIL, "Second attempt to flock() succeeded!");
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TEST(flock(fd1, LOCK_UN));
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if (TST_RET != 0)
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tst_res(TFAIL | TTERRNO, "Failed to unlock fd1");
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else
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tst_res(TPASS, "Unlocked fd1");
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TEST(flock(fd2, LOCK_EX | LOCK_NB));
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if (TST_RET != 0)
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tst_res(TFAIL | TTERRNO, "Third attempt to flock() denied!");
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else
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tst_res(TPASS, "Third attempt to flock() succeeded");
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SAFE_CLOSE(fd1);
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SAFE_CLOSE(fd2);
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}
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static void setup(void)
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{
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int fd;
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fd = SAFE_OPEN("testfile", O_CREAT | O_TRUNC | O_RDWR, 0666);
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SAFE_CLOSE(fd);
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}
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static struct tst_test test = {
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.test_all = verify_flock,
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.needs_tmpdir = 1,
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.setup = setup,
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};
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