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delay.c
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delay.c
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/*
* Copyright (c) 2018 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#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, struct timespec *val, 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 = *val;
}
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);
}