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tapdisk2.c
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tapdisk2.c
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/*
* Copyright (c) 2016, Citrix Systems, Inc.
*
* 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 of the copyright holder 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include "tapdisk.h"
#include "tapdisk-utils.h"
#include "tapdisk-server.h"
#include "tapdisk-control.h"
#include "tapdisk-metrics.h"
void tdnbd_fdreceiver_start();
void tdnbd_fdreceiver_stop();
static void
usage(const char *app, int err)
{
fprintf(stderr, "usage: %s <-u uuid> <-c control socket>\n", app);
exit(err);
}
static FILE *
fdup(FILE *stream, const char *mode)
{
int fd, err;
FILE *f;
fd = dup(STDOUT_FILENO);
if (fd < 0)
goto fail;
f = fdopen(fd, mode);
if (!f)
goto fail;
return f;
fail:
err = -errno;
if (fd >= 0)
close(fd);
errno = -err;
return NULL;
}
int
main(int argc, char *argv[])
{
char *control;
int c, err, nodaemon;
FILE *out;
control = NULL;
nodaemon = 0;
while ((c = getopt(argc, argv, "Dh")) != -1) {
switch (c) {
case 'D':
nodaemon = 1;
break;
case 'h':
usage(argv[0], 0);
break;
default:
usage(argv[0], EINVAL);
}
}
if (optind != argc)
usage(argv[0], EINVAL);
err = tapdisk_server_init();
if (err) {
DPRINTF("failed to initialize server: %d\n", err);
goto out;
}
out = fdup(stdout, "w");
if (!out) {
err = -errno;
DPRINTF("failed to dup stdout: %d\n", err);
goto out;
}
if (!nodaemon) {
err = daemon(0, 0);
if (err) {
DPRINTF("failed to daemonize: %d\n", errno);
goto out;
}
}
tapdisk_start_logging("tapdisk", NULL);
err = tapdisk_control_open(&control);
if (err) {
DPRINTF("failed to open control socket: %d\n", err);
goto out;
}
err = tapdisk_server_complete();
if (err) {
DPRINTF("failed to complete server: %d\n", err);
goto out;
}
DPRINTF("Tapdisk running, control on %s\n", control);
fprintf(out, "%s\n", control);
fclose(out);
err = td_metrics_start();
if (err) {
DPRINTF("failed to create metrics folder: %d\n", err);
goto out;
}
/*
* NB: We're unconditionally starting the FD receiver here - this is
* for the block-nbd driver. In the future we may want to start this as
* a response to a tap-ctl message
*/
tdnbd_fdreceiver_start();
err = tapdisk_server_run();
out:
if (err) {
EPRINTF("Tapdisk exiting with error %d\n", err);
}
td_metrics_stop();
tdnbd_fdreceiver_stop();
tapdisk_control_close();
tapdisk_stop_logging();
return -err;
}