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/*
* Check decoding of preadv and pwritev syscalls.
*
* Copyright (c) 2016 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2016-2023 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#if defined HAVE_PREADV && defined HAVE_PWRITEV
# include <fcntl.h>
# include <stdio.h>
# include <sys/uio.h>
# include <unistd.h>
int
main(void)
{
tprintf("%s", "");
static char tmp[] = "preadv-pwritev-tmpfile";
if (open(tmp, O_CREAT|O_RDONLY|O_TRUNC, 0600) != 0)
perror_msg_and_fail("creat: %s", tmp);
if (open(tmp, O_WRONLY) != 1)
perror_msg_and_fail("open: %s", tmp);
if (unlink(tmp))
perror_msg_and_fail("unlink: %s", tmp);
static const char w0_c[] = "012";
const char *w0_d = hexdump_strdup(w0_c);
void *w0 = tail_memdup(w0_c, LENGTH_OF(w0_c));
const void *efault = w0 + LENGTH_OF(w0_c);
static const char w1_c[] = "34567";
const char *w1_d = hexdump_strdup(w1_c);
void *w1 = tail_memdup(w1_c, LENGTH_OF(w1_c));
static const char w2_c[] = "89abcde";
const char *w2_d = hexdump_strdup(w2_c);
void *w2 = tail_memdup(w2_c, LENGTH_OF(w2_c));
long rc;
rc = pwritev(1, efault, 42, 0);
tprintf("pwritev(1, %p, 42, 0) = %s\n",
efault, sprintrc(rc));
rc = preadv(0, efault, 42, 0);
tprintf("preadv(0, %p, 42, 0) = %s\n",
efault, sprintrc(rc));
static const char r0_c[] = "01234567";
const char *r0_d = hexdump_strdup(r0_c);
static const char r1_c[] = "89abcde";
const char *r1_d = hexdump_strdup(r1_c);
const struct iovec w_iov_[] = {
{
.iov_base = w0,
.iov_len = LENGTH_OF(w0_c)
}, {
.iov_base = w1,
.iov_len = LENGTH_OF(w1_c)
}, {
.iov_base = w2,
.iov_len = LENGTH_OF(w2_c)
}
};
const struct iovec *w_iov = tail_memdup(w_iov_, sizeof(w_iov_));
rc = pwritev(1, w_iov, 0, 0);
if (rc)
perror_msg_and_fail("pwritev: expected 0, returned %ld", rc);
tprintf("pwritev(1, [], 0, 0) = 0\n");
rc = pwritev(1, w_iov + ARRAY_SIZE(w_iov_) - 1, 2, 0);
tprintf("pwritev(1, [{iov_base=\"%s\", iov_len=%u}, ... /* %p */], 2, 0)"
" = %s\n",
w2_c, LENGTH_OF(w2_c), w_iov + ARRAY_SIZE(w_iov_),
sprintrc(rc));
const unsigned int w_len =
LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c);
rc = pwritev(1, w_iov, ARRAY_SIZE(w_iov_), 0);
if (rc != (int) w_len)
perror_msg_and_fail("pwritev: expected %u, returned %ld",
w_len, rc);
close(1);
tprintf("pwritev(1, [{iov_base=\"%s\", iov_len=%u}"
", {iov_base=\"%s\", iov_len=%u}"
", {iov_base=\"%s\", iov_len=%u}], %u, 0) = %u\n"
" * %u bytes in buffer 0\n"
" | 00000 %-49s %-16s |\n"
" * %u bytes in buffer 1\n"
" | 00000 %-49s %-16s |\n"
" * %u bytes in buffer 2\n"
" | 00000 %-49s %-16s |\n",
w0_c, LENGTH_OF(w0_c), w1_c, LENGTH_OF(w1_c),
w2_c, LENGTH_OF(w2_c), (unsigned int) ARRAY_SIZE(w_iov_), w_len,
LENGTH_OF(w0_c), w0_d, w0_c,
LENGTH_OF(w1_c), w1_d, w1_c, LENGTH_OF(w2_c), w2_d, w2_c);
const unsigned int r_len = (w_len + 1) / 2;
void *r0 = tail_alloc(r_len);
const struct iovec r0_iov_[] = {
{
.iov_base = r0,
.iov_len = r_len
}
};
const struct iovec *r_iov = tail_memdup(r0_iov_, sizeof(r0_iov_));
rc = preadv(0, r_iov, ARRAY_SIZE(r0_iov_), 0);
if (rc != (int) r_len)
perror_msg_and_fail("preadv: expected %u, returned %ld",
r_len, rc);
tprintf("preadv(0, [{iov_base=\"%s\", iov_len=%u}], %u, 0) = %u\n"
" * %u bytes in buffer 0\n"
" | 00000 %-49s %-16s |\n",
r0_c, r_len, (unsigned int) ARRAY_SIZE(r0_iov_),
r_len, r_len, r0_d, r0_c);
void *r1 = tail_alloc(r_len);
void *r2 = tail_alloc(w_len);
const struct iovec r1_iov_[] = {
{
.iov_base = r1,
.iov_len = r_len
},
{
.iov_base = r2,
.iov_len = w_len
}
};
r_iov = tail_memdup(r1_iov_, sizeof(r1_iov_));
rc = preadv(0, r_iov, ARRAY_SIZE(r1_iov_), r_len);
if (rc != (int) w_len - (int) r_len)
perror_msg_and_fail("preadv: expected %d, returned %ld",
(int) w_len - r_len, rc);
tprintf("preadv(0, [{iov_base=\"%s\", iov_len=%u}"
", {iov_base=\"\", iov_len=%u}], %u, %u) = %u\n"
" * %u bytes in buffer 0\n"
" | 00000 %-49s %-16s |\n",
r1_c, r_len, w_len, (unsigned int) ARRAY_SIZE(r1_iov_),
r_len, w_len - r_len,
w_len - r_len, r1_d, r1_c);
close(0);
tprintf("+++ exited with 0 +++\n");
return 0;
}
#else
SKIP_MAIN_UNDEFINED("HAVE_PREADV && HAVE_PWRITEV")
#endif
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