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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2015 Fujitsu Ltd.
* Author: Xiao Yang <yangx.jy@cn.fujitsu.com>
* Copyright (c) Linux Test Project, 2016-2023
*/
/*\
* [Description]
*
* Testcase to check the basic functionality of the preadv(2).
*
* Preadv(2) should succeed to read the expected content of data
* and after reading the file, the file offset is not changed.
*/
#define _GNU_SOURCE
#include <string.h>
#include <sys/uio.h>
#include "tst_test.h"
#include "preadv.h"
#define CHUNK 64
static int fd;
static struct iovec *rd_iovec;
static struct tcase {
int count;
off_t offset;
ssize_t size;
char content;
} tcases[] = {
{1, 0, CHUNK, 'a'},
{2, 0, CHUNK, 'a'},
{1, CHUNK*3/2, CHUNK/2, 'b'}
};
static void verify_preadv(unsigned int n)
{
int i;
char *vec;
struct tcase *tc = &tcases[n];
vec = rd_iovec[0].iov_base;
memset(vec, 0x00, CHUNK);
SAFE_LSEEK(fd, 0, SEEK_SET);
TEST(preadv(fd, rd_iovec, tc->count, tc->offset));
if (TST_RET < 0) {
tst_res(TFAIL | TTERRNO, "Preadv(2) failed");
return;
}
if (TST_RET != tc->size) {
tst_res(TFAIL, "Preadv(2) read %li bytes, expected %zi",
TST_RET, tc->size);
return;
}
for (i = 0; i < tc->size; i++) {
if (vec[i] != tc->content)
break;
}
if (i < tc->size) {
tst_res(TFAIL, "Buffer wrong at %i have %02x expected %02x",
i, vec[i], tc->content);
return;
}
if (SAFE_LSEEK(fd, 0, SEEK_CUR) != 0) {
tst_res(TFAIL, "Preadv(2) has changed file offset");
return;
}
tst_res(TPASS, "Preadv(2) read %zi bytes successfully "
"with content '%c' expectedly", tc->size, tc->content);
}
static void setup(void)
{
char buf[CHUNK];
fd = SAFE_OPEN("file", O_RDWR | O_CREAT, 0644);
memset(buf, 'a', sizeof(buf));
SAFE_WRITE(SAFE_WRITE_ALL, fd, buf, sizeof(buf));
memset(buf, 'b', sizeof(buf));
SAFE_WRITE(SAFE_WRITE_ALL, fd, buf, sizeof(buf));
}
static void cleanup(void)
{
if (fd > 0)
SAFE_CLOSE(fd);
}
static struct tst_test test = {
.tcnt = ARRAY_SIZE(tcases),
.setup = setup,
.cleanup = cleanup,
.test = verify_preadv,
.needs_tmpdir = 1,
.bufs = (struct tst_buffers []) {
{&rd_iovec, .iov_sizes = (int[]){CHUNK, 0, -1}},
{},
}
};
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