11872214087-1756

Committed 16 Nov 2024 06:12PM UTC coverage: 70.243% (+0.5%) from 69.712%

Build # 11872214087-1756

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github

Committed by

tstack

Commit Message

[build] disable regex101

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0.0

/src/timer.cc

/**
 * Copyright (c) 2015, Suresh Sundriyal
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 * * 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.
 * * 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 REGENTS 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 REGENTS 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.
 */

#include "timer.hh"

#include "base/lnav_log.hh"
#include "config.h"

static const struct itimerval DISABLE_TV = {{0, 0}, {0, 0}};

timer::error::error(int err) : e_err(err) {}

timer::interrupt_timer::interrupt_timer(struct timeval t,
                                        sighandler_t_ sighandler = SIG_IGN)
    : new_handler(sighandler), new_val((struct itimerval){{0, 0}, t}),
      old_val(DISABLE_TV), armed(false)
{
    memset(&this->old_handler, 0, sizeof(this->old_handler));
}

int
timer::interrupt_timer::arm_timer()
{
    struct sigaction sa;

    // Disable the interval timer before setting the handler and arming the
    // interval timer or else we will have a race-condition where the timer
    // might fire and the appropriate handler might not be set.
    if (setitimer(ITIMER_REAL, &DISABLE_TV, &this->old_val) != 0) {
        log_error("Unable to disable the timer: %s", strerror(errno));
        return -1;
    }
    memset(&sa, 0, sizeof(sa));
    sa.sa_handler = this->new_handler;
    if (sigaction(SIGALRM, &sa, &this->old_handler) == -1) {
        log_error("Unable to set the signal handler: %s", strerror(errno));
        if (setitimer(ITIMER_REAL, &this->old_val, NULL) != 0) {
            log_error("Unable to reset the interrupt timer: %s",
                      strerror(errno));
            throw timer::error(errno);
        }
        return -1;
    }

    if (setitimer(ITIMER_REAL, &this->new_val, NULL) != 0) {
        if (sigaction(SIGALRM, &this->old_handler, NULL) == -1) {
            log_error("Unable to reset the signal handler: %s",
                      strerror(errno));
            throw timer::error(errno);
        }
        log_error("Unable to set the timer: %s", strerror(errno));
        return -1;
    }
    this->armed = true;
    return 0;
}

bool
timer::interrupt_timer::is_armed()
{
    return this->armed;
}

void
timer::interrupt_timer::disarm_timer()
{
    if (this->armed) {
        // Disable the interval timer before resetting the handler and rearming
        // the previous interval timer or else we will have a race-condition
        // where the timer might fire and the appropriate handler might not be
        // set.
        if (setitimer(ITIMER_REAL, &DISABLE_TV, NULL) != 0) {
            log_error("Failed to disable the timer: %s", strerror(errno));
            throw timer::error(errno);
        }
        if (sigaction(SIGALRM, &this->old_handler, NULL) == -1) {
            log_error("Failed to reinstall previous SIGALRM handler: %s",
                      strerror(errno));
            throw timer::error(errno);
        }
        if (setitimer(ITIMER_REAL, &this->old_val, NULL) != 0) {
            log_error("Failed to reset the timer to previous value: %s",
                      strerror(errno));
            throw timer::error(errno);
        }
        this->armed = false;
        this->old_val = DISABLE_TV;
        memset(&this->old_handler, 0, sizeof(this->old_handler));
    }
}

timer::interrupt_timer::~interrupt_timer()
{
    this->disarm_timer();
}

1	/**
2	* Copyright (c) 2015, Suresh Sundriyal
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	* * Redistributions of source code must retain the above copyright notice, this
10	* list of conditions and the following disclaimer.
11	* * Redistributions in binary form must reproduce the above copyright notice,
12	* this list of conditions and the following disclaimer in the documentation
13	* and/or other materials provided with the distribution.
14	* * Neither the name of the copyright holder nor the names of its contributors
15	* may be used to endorse or promote products derived from this software
16	* without specific prior written permission.
17	*
18	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
19	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
22	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	*/
29
30	#include "timer.hh"
31
32	#include "base/lnav_log.hh"
33	#include "config.h"
34
35	static const struct itimerval DISABLE_TV = {{0, 0}, {0, 0}};
36
37	timer::error::error(int err) : e_err(err) {}	×
38
39	timer::interrupt_timer::interrupt_timer(struct timeval t,	×
40	sighandler_t_ sighandler = SIG_IGN)	×
41	: new_handler(sighandler), new_val((struct itimerval){{0, 0}, t}),	×
42	old_val(DISABLE_TV), armed(false)	×
43	{
44	memset(&this->old_handler, 0, sizeof(this->old_handler));	×
45	}
46
47	int
48	timer::interrupt_timer::arm_timer()	×
49	{
50	struct sigaction sa;
51
52	// Disable the interval timer before setting the handler and arming the
53	// interval timer or else we will have a race-condition where the timer
54	// might fire and the appropriate handler might not be set.
55	if (setitimer(ITIMER_REAL, &DISABLE_TV, &this->old_val) != 0) {	×
56	log_error("Unable to disable the timer: %s", strerror(errno));	×
57	return -1;	×
58	}
59	memset(&sa, 0, sizeof(sa));	×
60	sa.sa_handler = this->new_handler;	×
61	if (sigaction(SIGALRM, &sa, &this->old_handler) == -1) {	×
62	log_error("Unable to set the signal handler: %s", strerror(errno));	×
63	if (setitimer(ITIMER_REAL, &this->old_val, NULL) != 0) {	×
64	log_error("Unable to reset the interrupt timer: %s",	×
65	strerror(errno));
66	throw timer::error(errno);	×
67	}
68	return -1;	×
69	}
70
71	if (setitimer(ITIMER_REAL, &this->new_val, NULL) != 0) {	×
72	if (sigaction(SIGALRM, &this->old_handler, NULL) == -1) {	×
73	log_error("Unable to reset the signal handler: %s",	×
74	strerror(errno));
75	throw timer::error(errno);	×
76	}
77	log_error("Unable to set the timer: %s", strerror(errno));	×
78	return -1;	×
79	}
80	this->armed = true;	×
81	return 0;	×
82	}
83
84	bool
85	timer::interrupt_timer::is_armed()	×
86	{
87	return this->armed;	×
88	}
89
90	void
91	timer::interrupt_timer::disarm_timer()	×
92	{
93	if (this->armed) {	×
94	// Disable the interval timer before resetting the handler and rearming
95	// the previous interval timer or else we will have a race-condition
96	// where the timer might fire and the appropriate handler might not be
97	// set.
98	if (setitimer(ITIMER_REAL, &DISABLE_TV, NULL) != 0) {	×
99	log_error("Failed to disable the timer: %s", strerror(errno));	×
100	throw timer::error(errno);	×
101	}
102	if (sigaction(SIGALRM, &this->old_handler, NULL) == -1) {	×
103	log_error("Failed to reinstall previous SIGALRM handler: %s",	×
104	strerror(errno));
105	throw timer::error(errno);	×
106	}
107	if (setitimer(ITIMER_REAL, &this->old_val, NULL) != 0) {	×
108	log_error("Failed to reset the timer to previous value: %s",	×
109	strerror(errno));
110	throw timer::error(errno);	×
111	}
112	this->armed = false;	×
113	this->old_val = DISABLE_TV;	×
114	memset(&this->old_handler, 0, sizeof(this->old_handler));	×
115	}
116	}
117
118	timer::interrupt_timer::~interrupt_timer()	×
119	{
120	this->disarm_timer();	×
121	}

tstack / lnav / 11872214087-1756

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