Branch data Line data Source code
1 : : /*
2 : : * Copyright (c) 2016, Citrix Systems, Inc.
3 : : *
4 : : * All rights reserved.
5 : : *
6 : : * Redistribution and use in source and binary forms, with or without
7 : : * modification, are permitted provided that the following conditions are met:
8 : : *
9 : : * 1. Redistributions of source code must retain the above copyright
10 : : * notice, this list of conditions and the following disclaimer.
11 : : * 2. Redistributions in binary form must reproduce the above copyright
12 : : * notice, this list of conditions and the following disclaimer in the
13 : : * documentation and/or other materials provided with the distribution.
14 : : * 3. Neither the name of the copyright holder nor the names of its
15 : : * contributors may be used to endorse or promote products derived from
16 : : * this software without specific prior written permission.
17 : : *
18 : : * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 : : * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 : : * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 : : * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
22 : : * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 : : * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 : : * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25 : : * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26 : : * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27 : : * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 : : * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 : : */
30 : :
31 : : #ifndef _TAPDISK_STATS_H_
32 : : #define _TAPDISK_STATS_H_
33 : :
34 : : #include <string.h>
35 : :
36 : : #define TD_STATS_MAX_DEPTH 8
37 : :
38 : : struct tapdisk_stats_ctx {
39 : : char *pos;
40 : :
41 : : char *buf;
42 : : size_t size;
43 : :
44 : : int n_elem[TD_STATS_MAX_DEPTH];
45 : : int depth;
46 : : int err;
47 : : };
48 : :
49 : : typedef struct tapdisk_stats_ctx td_stats_t;
50 : :
51 : : static inline void
52 : : tapdisk_stats_init(td_stats_t *st, char *buf, size_t size)
53 : : {
54 : : memset(st, 0, sizeof(*st));
55 : :
56 : 3 : st->pos = buf;
57 : 3 : st->buf = buf;
58 : 3 : st->size = size;
59 : : }
60 : :
61 : : static inline ssize_t
62 : : tapdisk_stats_length(td_stats_t *st)
63 : : {
64 : : if (st->err)
65 : : return st->err;
66 : :
67 : : return st->pos - st->buf;
68 : : }
69 : :
70 : : void tapdisk_stats_enter(td_stats_t *st, char t);
71 : : void tapdisk_stats_leave(td_stats_t *st, char t);
72 : : void tapdisk_stats_field(td_stats_t *st, const char *key, const char *conv, ...);
73 : : void tapdisk_stats_val(td_stats_t *st, const char *conv, ...);
74 : :
75 : : #endif /* _TAPDISK_STATS_H_ */
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