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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2023 OpenVPN Inc <sales@openvpn.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef SIG_H
#define SIG_H
#include "status.h"
#include "win32.h"
#define SIG_SOURCE_SOFT 0
#define SIG_SOURCE_HARD 1
/* CONNECTION_FAILED is also a "soft" status,
* It is thrown if a connection attempt fails
*/
#define SIG_SOURCE_CONNECTION_FAILED 2
/*
* Signal information, including signal code
* and descriptive text.
*/
struct signal_info
{
volatile int signal_received;
volatile int source;
const char *signal_text;
};
#define IS_SIG(c) ((c)->sig->signal_received)
struct context;
extern struct signal_info siginfo_static;
int parse_signal(const char *signame);
const char *signal_name(const int sig, const bool upper);
const char *signal_description(const int signum, const char *sigtext);
void throw_signal(const int signum);
void throw_signal_soft(const int signum, const char *signal_text);
void pre_init_signal_catch(void);
void post_init_signal_catch(void);
void restore_signal_state(void);
void print_signal(const struct signal_info *si, const char *title, int msglevel);
void print_status(struct context *c, struct status_output *so);
void remap_signal(struct context *c);
void signal_restart_status(const struct signal_info *si);
bool process_signal(struct context *c);
void register_signal(struct signal_info *si, int sig, const char *text);
void process_explicit_exit_notification_timer_wakeup(struct context *c);
void signal_reset(struct signal_info *si);
static inline void
halt_non_edge_triggered_signals(void)
{
#ifdef _WIN32
win32_signal_close(&win32_signal);
#endif
}
/**
* Copy the global signal_received (if non-zero) to the passed-in argument sig.
* As the former is volatile, do not assign if sig and &signal_received are the
* same. Even on windows signal_received is really volatile as it can change if
* a ctrl-C or ctrl-break is delivered. So use the same logic as above.
*
* Also, on windows always call win32_signal_get to pickup any signals simulated by
* key-board short cuts or the exit event.
*/
static inline void
get_signal(volatile int *sig)
{
#ifdef _WIN32
const int i = win32_signal_get(&win32_signal);
#else
const int i = siginfo_static.signal_received;
#endif
if (i && sig != &siginfo_static.signal_received)
{
*sig = i;
}
}
#endif /* ifndef SIG_H */
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