1 /*
2 * Copyright (c) 2008, XenSource Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of XenSource Inc. nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
20 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28 #include <stdio.h>
29 #include <errno.h>
30 #include <stdlib.h>
31 #include <unistd.h>
32 #include <string.h>
33 #include <getopt.h>
34
35 #include "tap-ctl.h"
36
37 static int
__tap_ctl_close(const int id,const int minor,const int force)38 __tap_ctl_close(const int id, const int minor, const int force)
39 {
40 int err;
41 tapdisk_message_t message;
42
43 memset(&message, 0, sizeof(message));
44 message.type = TAPDISK_MESSAGE_CLOSE;
45 if (force)
46 message.type = TAPDISK_MESSAGE_FORCE_SHUTDOWN;
47 message.cookie = minor;
48
49 err = tap_ctl_connect_send_and_receive(id, &message, 5);
50 if (err)
51 return err;
52
53 if (message.type == TAPDISK_MESSAGE_CLOSE_RSP) {
54 err = message.u.response.error;
55 if (err)
56 EPRINTF("close failed: %d\n", err);
57 } else {
58 EPRINTF("got unexpected result '%s' from %d\n",
59 tapdisk_message_name(message.type), id);
60 err = EINVAL;
61 }
62
63 return err;
64 }
65
66 int
tap_ctl_close(const int id,const int minor,const int force)67 tap_ctl_close(const int id, const int minor, const int force)
68 {
69 int i, err;
70
71 for (i = 0; i < 20; i++) {
72 err = __tap_ctl_close(id, minor, force);
73 if (!err)
74 return 0;
75
76 err = (err < 0 ? -err : err);
77 if (err != EAGAIN) {
78 EPRINTF("close failed: %d\n", err);
79 return err;
80 }
81
82 usleep(1000);
83 }
84
85 EPRINTF("close timed out\n");
86 return EIO;
87 }
88