1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
/*
* Copyright (c) 2018 The strace developers.
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include "defs.h"
struct inject_delay_data {
struct timespec ts_enter;
struct timespec ts_exit;
};
static struct inject_delay_data *delay_data_vec;
static size_t delay_data_vec_capacity; /* size of the arena */
static size_t delay_data_vec_size; /* size of the used arena */
static timer_t delay_timer = (timer_t) -1;
static bool delay_timer_is_armed;
static void
expand_delay_data_vec(void)
{
const size_t old_capacity = delay_data_vec_capacity;
delay_data_vec = xgrowarray(delay_data_vec, &delay_data_vec_capacity,
sizeof(*delay_data_vec));
memset(delay_data_vec + old_capacity, 0,
(delay_data_vec_capacity - old_capacity)
* sizeof(*delay_data_vec));
}
uint16_t
alloc_delay_data(void)
{
const uint16_t rval = delay_data_vec_size;
if (rval < delay_data_vec_size)
error_func_msg_and_die("delay index overflow");
if (delay_data_vec_size == delay_data_vec_capacity)
expand_delay_data_vec();
++delay_data_vec_size;
return rval;
}
void
fill_delay_data(uint16_t delay_idx, int intval, bool isenter)
{
if (delay_idx >= delay_data_vec_size)
error_func_msg_and_die("delay_idx >= delay_data_vec_size");
struct timespec *ts;
if (isenter)
ts = &(delay_data_vec[delay_idx].ts_enter);
else
ts = &(delay_data_vec[delay_idx].ts_exit);
ts->tv_sec = intval / 1000000;
ts->tv_nsec = intval % 1000000 * 1000;
}
static bool
is_delay_timer_created(void)
{
return delay_timer != (timer_t) -1;
}
bool
is_delay_timer_armed(void)
{
return delay_timer_is_armed;
}
void
delay_timer_expired(void)
{
delay_timer_is_armed = false;
}
void
arm_delay_timer(const struct tcb *const tcp)
{
const struct itimerspec its = {
.it_value = tcp->delay_expiration_time
};
if (timer_settime(delay_timer, TIMER_ABSTIME, &its, NULL))
perror_msg_and_die("timer_settime");
delay_timer_is_armed = true;
debug_func_msg("timer set to %lld.%09ld for pid %d",
(long long) tcp->delay_expiration_time.tv_sec,
(long) tcp->delay_expiration_time.tv_nsec,
tcp->pid);
}
void
delay_tcb(struct tcb *tcp, uint16_t delay_idx, bool isenter)
{
if (delay_idx >= delay_data_vec_size)
error_func_msg_and_die("delay_idx >= delay_data_vec_size");
debug_func_msg("delaying pid %d on %s",
tcp->pid, isenter ? "enter" : "exit");
tcp->flags |= TCB_DELAYED;
struct timespec *ts_diff;
if (isenter)
ts_diff = &(delay_data_vec[delay_idx].ts_enter);
else
ts_diff = &(delay_data_vec[delay_idx].ts_exit);
struct timespec ts_now;
clock_gettime(CLOCK_MONOTONIC, &ts_now);
ts_add(&tcp->delay_expiration_time, &ts_now, ts_diff);
if (is_delay_timer_created()) {
struct itimerspec its;
if (timer_gettime(delay_timer, &its))
perror_msg_and_die("timer_gettime");
const struct timespec *const ts_old = &its.it_value;
if (ts_nz(ts_old) && ts_cmp(ts_diff, ts_old) > 0)
return;
} else {
if (timer_create(CLOCK_MONOTONIC, NULL, &delay_timer))
perror_msg_and_die("timer_create");
}
arm_delay_timer(tcp);
}
|
