117 lines
2.6 KiB
C
117 lines
2.6 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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* Copyright (c) International Business Machines Corp., 2001
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* 07/2001 Ported by Wayne Boyer
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*/
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/*\
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* [Description]
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*
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* Verify the functionality of pread() by writing known data using pwrite()
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* to the file at various specified offsets and later read from the file from
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* various specified offsets, comparing the data read against the data written.
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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 TEMPFILE "pread_file"
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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 K4 (K1 * 4)
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#define NBUFS 4
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static int fildes;
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static char *write_buf[NBUFS];
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static char *read_buf[NBUFS];
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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, "return = %" PRId64 ", expected %" PRId64,
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(int64_t) offloc, (int64_t) checkoff);
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}
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}
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static void compare_bufers(void)
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{
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int count;
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int err_flg = 0;
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for (count = 0; count < NBUFS; count++) {
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if (memcmp(write_buf[count], read_buf[count], K1) != 0) {
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tst_res(TFAIL, "read/write buffer[%d] data mismatch", count);
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err_flg++;
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}
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}
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if (!err_flg)
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tst_res(TPASS, "Functionality of pread() is correct");
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}
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static void verify_pread(void)
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{
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SAFE_PREAD(1, fildes, read_buf[2], K1, K2);
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l_seek(fildes, 0, SEEK_CUR, K4);
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l_seek(fildes, 0, SEEK_SET, 0);
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SAFE_PREAD(1, fildes, read_buf[3], K1, K3);
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l_seek(fildes, 0, SEEK_CUR, 0);
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SAFE_READ(1, fildes, read_buf[0], K1);
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l_seek(fildes, 0, SEEK_CUR, K1);
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SAFE_PREAD(1, fildes, read_buf[1], K1, K1);
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l_seek(fildes, 0, SEEK_CUR, K1);
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compare_bufers();
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l_seek(fildes, K4, SEEK_SET, K4);
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}
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static void setup(void)
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{
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int count;
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for (count = 0; count < NBUFS; count++) {
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write_buf[count] = SAFE_MALLOC(K1);
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read_buf[count] = SAFE_MALLOC(K1);
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memset(write_buf[count], count, K1);
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}
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fildes = SAFE_OPEN(TEMPFILE, O_RDWR | O_CREAT, 0666);
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SAFE_PWRITE(1, fildes, write_buf[0], K1, 0);
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SAFE_PWRITE(1, fildes, write_buf[2], K1, K2);
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SAFE_PWRITE(1, fildes, write_buf[3], K1, K3);
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SAFE_PWRITE(1, fildes, write_buf[1], K1, K1);
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SAFE_LSEEK(fildes, K4, SEEK_SET);
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}
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static void cleanup(void)
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{
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int count;
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for (count = 0; count < NBUFS; count++) {
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free(write_buf[count]);
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free(read_buf[count]);
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}
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if (fildes > 0)
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SAFE_CLOSE(fildes);
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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_pread,
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};
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