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| | // SPDX-License-Identifier: GPL-2.0-or-later
/* rampstream - Generate a check and stream of bytes in a ramp pattern
*
* Copyright Red Hat
* Author: David Gibson <david@gibson.dropbear.id.au>
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
/* Length of the repeating ramp. This is a deliberately not a "round" number so
* that we're very likely to misalign with likely block or chunk sizes of the
* transport. That means we'll detect gaps in the stream, even if they occur
* neatly on block boundaries. Specifically this is the largest 8-bit prime. */
#define RAMPLEN 251
#define INTERVAL 10000
#define ARRAY_SIZE(a) ((int)(sizeof(a) / sizeof((a)[0])))
#define die(...) \
do { \
fprintf(stderr, "rampstream: " __VA_ARGS__); \
exit(1); \
} while (0)
static void usage(void)
{
die("Usage:\n"
" rampstream send <number>\n"
" Generate a ramp pattern of bytes on stdout, repeated <number>\n"
" times\n"
" rampstream check <number>\n"
" Check a ramp pattern of bytes on stdin, repeater <number>\n"
" times\n");
}
static void ramp_send(unsigned long long num, const uint8_t *ramp)
{
unsigned long long i;
for (i = 0; i < num; i++) {
int off = 0;
ssize_t rc;
if (i % INTERVAL == 0)
fprintf(stderr, "%llu...\r", i);
while (off < RAMPLEN) {
rc = write(1, ramp + off, RAMPLEN - off);
if (rc < 0) {
if (errno == EINTR ||
errno == EAGAIN ||
errno == EWOULDBLOCK)
continue;
die("Error writing ramp: %s\n",
strerror(errno));
}
if (rc == 0)
die("Zero length write\n");
off += rc;
}
}
}
static void ramp_check(unsigned long long num, const uint8_t *ramp)
{
unsigned long long i;
for (i = 0; i < num; i++) {
uint8_t buf[RAMPLEN];
int off = 0;
ssize_t rc;
if (i % INTERVAL == 0)
fprintf(stderr, "%llu...\r", i);
while (off < RAMPLEN) {
rc = read(0, buf + off, RAMPLEN - off);
if (rc < 0) {
if (errno == EINTR ||
errno == EAGAIN ||
errno == EWOULDBLOCK)
continue;
die("Error reading ramp: %s\n",
strerror(errno));
}
if (rc == 0)
die("Unexpected EOF, ramp %llu, byte %d\n",
i, off);
off += rc;
}
if (memcmp(buf, ramp, sizeof(buf)) != 0) {
int j, k;
for (j = 0; j < RAMPLEN; j++)
if (buf[j] != ramp[j])
break;
for (k = j; k < RAMPLEN && k < j + 16; k++)
fprintf(stderr,
"Byte %d: expected 0x%02x, got 0x%02x\n",
k, ramp[k], buf[k]);
die("Data mismatch, ramp %llu, byte %d\n", i, j);
}
}
}
int main(int argc, char *argv[])
{
const char *subcmd = argv[1];
unsigned long long num;
uint8_t ramp[RAMPLEN];
char *e;
int i;
if (argc < 2)
usage();
errno = 0;
num = strtoull(argv[2], &e, 0);
if (*e || errno)
usage();
/* Initialize the ramp block */
for (i = 0; i < RAMPLEN; i++)
ramp[i] = i;
if (strcmp(subcmd, "send") == 0)
ramp_send(num, ramp);
else if (strcmp(subcmd, "check") == 0)
ramp_check(num, ramp);
else
usage();
exit(0);
}
|