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76 lines
1.5 KiB
76 lines
1.5 KiB
7 months ago
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) International Business Machines Corp., 2001
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* 07/2001 Ported by John George
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* Copyright (c) 2017 Fujitsu Ltd.
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* 04/2017 Modified by Jinhui Huang
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*/
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/*
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* DESCRIPTION
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* Testcase to check that write(2) doesn't corrupt a file when it fails
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*
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* ALGORITHM
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* Create a file for writing, write 100 bytes to it. Then make write(2)
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* fail with some erroneous parameter, close the fd. Then reopen the
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* file in RDONLY mode, and read the contents of the file. Compare the
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* buffers, to see whether they are same.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include "tst_test.h"
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static char *bad_addr;
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static char wbuf[BUFSIZ], rbuf[BUFSIZ];
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static int fd;
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static void verify_write(void)
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{
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fd = SAFE_CREAT("testfile", 0644);
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SAFE_WRITE(1, fd, wbuf, 100);
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if (write(fd, bad_addr, 100) != -1) {
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tst_res(TFAIL, "write() failed to fail");
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SAFE_CLOSE(fd);
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return;
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}
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SAFE_CLOSE(fd);
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fd = SAFE_OPEN("testfile", O_RDONLY);
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memset(rbuf, 0, BUFSIZ);
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SAFE_READ(0, fd, rbuf, 100);
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if (memcmp(wbuf, rbuf, 100) == 0)
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tst_res(TPASS, "failure of write() did not corrupt the file");
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else
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tst_res(TFAIL, "failure of write() corrupted the file");
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SAFE_CLOSE(fd);
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}
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static void setup(void)
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{
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bad_addr = SAFE_MMAP(0, 1, PROT_NONE,
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MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
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memset(wbuf, '0', 100);
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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);
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}
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static struct tst_test test = {
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.test_all = verify_write,
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.setup = setup,
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.cleanup = cleanup,
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.needs_tmpdir = 1,
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};
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