blob: b0603c20063da8040d1bdef5d852e92073d2bab6 [file] [log] [blame]
/*
* Check decoding of readv and writev syscalls.
*
* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "tests.h"
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/uio.h>
int
main(void)
{
tprintf("%s", "");
int fds[2];
if (pipe(fds))
perror_msg_and_fail("pipe");
assert(0 == fds[0]);
assert(1 == fds[1]);
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));
assert(writev(1, efault, 42) == -1);
tprintf("writev(1, %p, 42) = -1 EFAULT (%m)\n", efault);
assert(readv(0, efault, 42) == -1);
tprintf("readv(0, %p, 42) = -1 EFAULT (%m)\n", efault);
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_));
assert(writev(1, w_iov, 0) == 0);
tprintf("writev(1, [], 0) = 0\n");
assert(writev(1, w_iov + ARRAY_SIZE(w_iov_) - 1, 2) == -1);
tprintf("writev(1, [{\"%s\", %u}, %p], 2) = -1 EFAULT (%m)\n",
w2_c, LENGTH_OF(w2_c), w_iov + ARRAY_SIZE(w_iov_));
const unsigned int w_len =
LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c);
assert(writev(1, w_iov, ARRAY_SIZE(w_iov_)) == (int) w_len);
close(1);
tprintf("writev(1, [{\"%s\", %u}, {\"%s\", %u}"
", {\"%s\", %u}], %u) = %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), 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_));
assert(readv(0, r_iov, ARRAY_SIZE(r0_iov_)) == (int) r_len);
tprintf("readv(0, [{\"%s\", %u}], %u) = %u\n"
" * %u bytes in buffer 0\n"
" | 00000 %-49s %-16s |\n",
r0_c, r_len, 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_));
assert(readv(0, r_iov, ARRAY_SIZE(r1_iov_)) == (int) w_len - r_len);
tprintf("readv(0, [{\"%s\", %u}, {\"\", %u}], %u) = %u\n"
" * %u bytes in buffer 0\n"
" | 00000 %-49s %-16s |\n",
r1_c, r_len, w_len, ARRAY_SIZE(r1_iov_), w_len - r_len,
w_len - r_len, r1_d, r1_c);
close(0);
tprintf("+++ exited with 0 +++\n");
return 0;
}