94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
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// 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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* Copyright (c) International Business Machines Corp., 2002
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* ported from SPIE, section2/filesuite/pread_pwrite.c, by Airong Zhang
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*/
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/*\
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* [Description]
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*
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* Test the pwrite() system call with O_APPEND.
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*
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* Writing 2k data to the file, close it and reopen it with O_APPEND.
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*
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* POSIX requires that opening a file with the O_APPEND flag should have no effect on the
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* location at which pwrite() writes data. However, on Linux, if a file is opened with
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* O_APPEND, pwrite() appends data to the end of the file, regardless of the value of offset.
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*/
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#include <stdlib.h>
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#include <inttypes.h>
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#include "tst_test.h"
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#include "tst_safe_prw.h"
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#define K1 1024
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#define K2 (K1 * 2)
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#define K3 (K1 * 3)
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#define DATA_FILE "pwrite04_file"
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static int fd = -1;
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static char *write_buf[2];
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static void l_seek(int fdesc, off_t offset, int whence, off_t checkoff)
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{
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off_t offloc;
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offloc = SAFE_LSEEK(fdesc, offset, whence);
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if (offloc != checkoff) {
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tst_res(TFAIL, "%" PRId64 " = lseek(%d, %" PRId64 ", %d) != %" PRId64,
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(int64_t)offloc, fdesc, (int64_t)offset, whence, (int64_t)checkoff);
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}
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}
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static void verify_pwrite(void)
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{
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struct stat statbuf;
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fd = SAFE_OPEN(DATA_FILE, O_RDWR | O_CREAT | O_TRUNC, 0666);
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SAFE_PWRITE(1, fd, write_buf[0], K2, 0);
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SAFE_CLOSE(fd);
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fd = SAFE_OPEN(DATA_FILE, O_RDWR | O_APPEND, 0666);
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SAFE_FSTAT(fd, &statbuf);
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if (statbuf.st_size != K2)
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tst_res(TFAIL, "file size is %ld != K2", statbuf.st_size);
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/* Appends data to the end of the file regardless of offset. */
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l_seek(fd, K1, SEEK_SET, K1);
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SAFE_PWRITE(1, fd, write_buf[1], K1, 0);
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l_seek(fd, 0, SEEK_CUR, K1);
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SAFE_FSTAT(fd, &statbuf);
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if (statbuf.st_size != K3)
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tst_res(TFAIL, "file size is %ld != K3", statbuf.st_size);
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tst_res(TPASS, "O_APPEND test passed.");
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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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write_buf[0] = SAFE_MALLOC(K2);
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memset(write_buf[0], 0, K2);
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write_buf[1] = SAFE_MALLOC(K1);
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memset(write_buf[0], 1, K1);
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}
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static void cleanup(void)
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{
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free(write_buf[0]);
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free(write_buf[1]);
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if (fd > -1)
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SAFE_CLOSE(fd);
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SAFE_UNLINK(DATA_FILE);
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}
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static struct tst_test test = {
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.needs_tmpdir = 1,
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.setup = setup,
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.cleanup = cleanup,
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.test_all = verify_pwrite,
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};
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