reflect.c
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/****************************************************************************
*
* Copyright (c) 2014 Andrew Tridgell. 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. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
****************************************************************************/
/**
* @file reflect.c
*
* simple data reflector for load testing terminals (especially USB)
*
* @author Andrew Tridgell
*/
#include <px4_platform_common/px4_config.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include <systemlib/err.h>
__EXPORT int reflect_main(int argc, char *argv[]);
// memory corruption checking
#define MAX_BLOCKS 1000
static uint32_t nblocks;
struct block {
uint32_t v[256];
};
static struct block *blocks[MAX_BLOCKS];
#define VALUE(i) ((i*7) ^ 0xDEADBEEF)
static void allocate_blocks(void)
{
while (nblocks < MAX_BLOCKS) {
blocks[nblocks] = calloc(1, sizeof(struct block));
if (blocks[nblocks] == NULL) {
break;
}
for (uint32_t i = 0; i < sizeof(blocks[nblocks]->v) / sizeof(uint32_t); i++) {
blocks[nblocks]->v[i] = VALUE(i);
}
nblocks++;
}
printf("Allocated %u blocks\n", nblocks);
}
static void check_blocks(void)
{
for (uint32_t n = 0; n < nblocks; n++) {
for (uint32_t i = 0; i < sizeof(blocks[nblocks]->v) / sizeof(uint32_t); i++) {
assert(blocks[n]->v[i] == VALUE(i));
}
}
}
int
reflect_main(int argc, char *argv[])
{
uint32_t total = 0;
printf("Starting reflector\n");
allocate_blocks();
while (true) {
char buf[128];
ssize_t n = read(0, buf, sizeof(buf));
if (n < 0) {
break;
}
if (n > 0) {
write(1, buf, n);
}
total += n;
if (total > 1024000) {
check_blocks();
total = 0;
}
}
return OK;
}