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/* ftcat -- Pump events from a Feather-Trace device to stdout.
* Copyright (C) 2007, 2008 B. Brandenburg.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/ioctl.h>
#include "timestamp.h"
#define MAX_EVENTS 128
static int fd;
static int event_count = 0;
static cmd_t ids[MAX_EVENTS];
static unsigned long total_bytes = 0;
static unsigned long stop_after_bytes = 0;
static int disable_all(int fd)
{
int disabled = 0;
int i;
fprintf(stderr, "Disabling %d events.\n", event_count);
for (i = 0; i < event_count; i++)
if (ioctl(fd, DISABLE_CMD, ids[i]) < 0)
perror("ioctl(DISABLE_CMD)");
else
disabled++;
return disabled == event_count;
}
static int enable_event(int fd, char* str)
{
cmd_t *id;
int err;
id = ids + event_count;
if (!str2event(str, id)) {
errno = EINVAL;
return 0;
}
event_count += 1;
err = ioctl(fd, ENABLE_CMD, *id);
if (err < 0)
printf("ioctl(%d, %d, %d) => %d (errno: %d)\n", fd, (int) ENABLE_CMD, *id,
err, errno);
return err == 0;
}
static void cat2stdout(int fd)
{
static char buf[4096];
int rd;
while ((rd = read(fd, buf, 4096)) > 0) {
total_bytes += rd;
fwrite(buf, 1, rd, stdout);
if (stop_after_bytes && total_bytes >= stop_after_bytes)
break;
}
}
static void _usage(void)
{
fprintf(stderr,
"Usage: ftcat [OPTIONS] <ft device> TS1 TS2 ....\n"
"\nOptions:\n"
" -s SIZE -- stop tracing afer recording SIZE bytes\n");
exit(1);
}
#define usage(fmt, args...) do { fprintf(stderr, "Error: " fmt "\n", ## args); _usage(); } while (0)
static void shutdown(int sig)
{
int ok;
ok = disable_all(fd);
if (!ok)
fprintf(stderr, "disable_all: %m\n");
}
#define OPTSTR "s:"
int main(int argc, char** argv)
{
int opt;
const char* trace_file;
while ((opt = getopt(argc, argv, OPTSTR)) != -1) {
switch (opt) {
case 's':
stop_after_bytes = atol(optarg);
if (stop_after_bytes == 0)
usage("invalid size (%s)", optarg);
break;
case ':':
usage("Argument missing.");
break;
case '?':
default:
usage("Bad argument.");
break;
}
}
argc -= optind;
argv += optind;
if (argc < 3)
usage("Argument missing.");
trace_file = argv[0];
fd = open(trace_file, O_RDWR);
if (fd < 0) {
usage("could not open feathertrace device (%s): %m", trace_file);
return 1;
}
argc -= 1;
argv += 1;
signal(SIGINT, shutdown);
signal(SIGUSR1, shutdown);
signal(SIGTERM, shutdown);
while (argc--) {
if (!enable_event(fd, *argv)) {
fprintf(stderr, "Enabling %s failed: %m\n", *argv);
return 2;
}
argv++;
}
cat2stdout(fd);
close(fd);
fflush(stdout);
fprintf(stderr, "%s: %lu bytes read.\n", trace_file, total_bytes);
return 0;
}
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