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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Quagga Signal handling header.
*
* Copyright (C) 2004 Paul Jakma.
*/
#ifndef _FRR_SIGNAL_H
#define _FRR_SIGNAL_H
#include <frrevent.h>
#ifdef __cplusplus
extern "C" {
#endif
#define FRR_SIGNAL_TIMER_INTERVAL 2L
struct frr_signal_t {
int signal; /* signal number */
void (*handler)(void); /* handler to call */
volatile sig_atomic_t caught; /* private member */
};
/* initialise sigevent system
* takes:
* - pointer to valid struct event_loop
* - number of elements in passed in signals array
* - array of frr_signal_t's describing signals to handle
* and handlers to use for each signal
*/
extern void signal_init(struct event_loop *m, int sigc,
struct frr_signal_t *signals);
/*
* Check whether any signals have been received and are pending. This is done
* with the application's key signals blocked. The complete set of signals
* is returned in 'setp', so the caller can restore them when appropriate.
* If there are pending signals, returns 'true', 'false' otherwise.
*/
bool frr_sigevent_check(sigset_t *setp);
/* check whether there are signals to handle, process any found */
extern int frr_sigevent_process(void);
/* Ensure we don't handle "application-type" signals on a secondary thread by
* blocking these signals when creating threads
*
* NB: SIGSEGV, SIGABRT, etc. must be allowed on all threads or we get no
* crashlogs. Since signals vary a little bit between platforms, below is a
* list of known things to go to the main thread. Any unknown signals should
* stay thread-local.
*/
static inline void frr_sigset_add_mainonly(sigset_t *blocksigs)
{
/* signals we actively handle */
sigaddset(blocksigs, SIGHUP);
sigaddset(blocksigs, SIGINT);
sigaddset(blocksigs, SIGTERM);
sigaddset(blocksigs, SIGUSR1);
/* signals we don't actively use but that semantically belong */
sigaddset(blocksigs, SIGUSR2);
sigaddset(blocksigs, SIGQUIT);
sigaddset(blocksigs, SIGCHLD);
sigaddset(blocksigs, SIGPIPE);
sigaddset(blocksigs, SIGTSTP);
sigaddset(blocksigs, SIGTTIN);
sigaddset(blocksigs, SIGTTOU);
sigaddset(blocksigs, SIGWINCH);
}
#ifdef __cplusplus
}
#endif
#endif /* _FRR_SIGNAL_H */
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