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/*
* Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
* Copyright (c) 2016-2020 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#ifdef HAVE_PREADV
# include <fcntl.h>
# include <stdio.h>
# include <sys/uio.h>
# include <unistd.h>
# define LEN 8
static void
print_iov(const struct iovec *iov)
{
unsigned int i;
unsigned char *buf = iov->iov_base;
fputs("{iov_base=\"", stdout);
for (i = 0; i < iov->iov_len; ++i)
printf("\\%d", (int) buf[i]);
printf("\", iov_len=%u}", (unsigned) iov->iov_len);
}
static void
print_iovec(const struct iovec *iov, unsigned int cnt)
{
unsigned int i;
putchar('[');
for (i = 0; i < cnt; ++i) {
if (i)
fputs(", ", stdout);
print_iov(&iov[i]);
}
putchar(']');
}
int
main(void)
{
const off_t offset = 0xdefaceddeadbeefLL;
char *buf = tail_alloc(LEN);
TAIL_ALLOC_OBJECT_CONST_PTR(struct iovec, iov);
iov->iov_base = buf;
iov->iov_len = LEN;
(void) close(0);
if (open("/dev/zero", O_RDONLY))
perror_msg_and_fail("open");
if (preadv(0, iov, 1, offset) != LEN)
perror_msg_and_fail("preadv");
printf("preadv(0, ");
print_iovec(iov, 1);
printf(", 1, %lld) = %u\n", (long long) offset, LEN);
if (preadv(0, iov, 1, -1) != -1)
perror_msg_and_fail("preadv");
printf("preadv(0, [{iov_base=%p, iov_len=%zu}], 1, -1) = "
"-1 EINVAL (%m)\n", iov->iov_base, iov->iov_len);
if (preadv(0, NULL, 1, -2) != -1)
perror_msg_and_fail("preadv");
printf("preadv(0, NULL, 1, -2) = -1 EINVAL (%m)\n");
if (preadv(0, iov, 0, -3) != -1)
perror_msg_and_fail("preadv");
printf("preadv(0, [], 0, -3) = -1 EINVAL (%m)\n");
int fd = create_tmpfile(O_RDWR);
static const char w[] = "0123456789abcde";
if (write(fd, w, LENGTH_OF(w)) != LENGTH_OF(w))
perror_msg_and_fail("write");
static const char r0_c[] = "01234567";
static const char r1_c[] = "89abcde";
const unsigned int r_len = (LENGTH_OF(w) + 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_));
long rc;
rc = preadv(fd, r_iov, ARRAY_SIZE(r0_iov_), 0);
if (rc != (int) r_len)
perror_msg_and_fail("preadv: expected %u, returned %ld",
r_len, rc);
printf("preadv(%d, [{iov_base=\"%s\", iov_len=%u}], %u, 0) = %u\n",
fd, r0_c, r_len, (unsigned int) ARRAY_SIZE(r0_iov_), r_len);
void *r1 = tail_alloc(r_len);
void *r2 = tail_alloc(LENGTH_OF(w));
const struct iovec r1_iov_[] = {
{
.iov_base = r1,
.iov_len = r_len
},
{
.iov_base = r2,
.iov_len = LENGTH_OF(w)
}
};
r_iov = tail_memdup(r1_iov_, sizeof(r1_iov_));
rc = preadv(fd, r_iov, ARRAY_SIZE(r1_iov_), r_len);
if (rc != (int) LENGTH_OF(w) - (int) r_len)
perror_msg_and_fail("preadv: expected %d, returned %ld",
(int) LENGTH_OF(w) - r_len, rc);
printf("preadv(%d, [{iov_base=\"%s\", iov_len=%u}"
", {iov_base=\"\", iov_len=%u}], %u, %u) = %u\n",
fd, r1_c, r_len, LENGTH_OF(w),
(unsigned int) ARRAY_SIZE(r1_iov_),
r_len, LENGTH_OF(w) - r_len);
puts("+++ exited with 0 +++");
return 0;
}
#else
SKIP_MAIN_UNDEFINED("HAVE_PREADV")
#endif
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