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13a6ac5b4c
Blocking all signals on non-main threads is not the way to go, at least the handlers for SIGSEGV, SIGBUS, SIGILL, SIGABRT and SIGFPE need to run so we get backtraces. Otherwise the process just exits. Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Quagga Signal handling header.
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*
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* Copyright (C) 2004 Paul Jakma.
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*/
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#ifndef _FRR_SIGNAL_H
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#define _FRR_SIGNAL_H
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#include <frrevent.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define FRR_SIGNAL_TIMER_INTERVAL 2L
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struct frr_signal_t {
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int signal; /* signal number */
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void (*handler)(void); /* handler to call */
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volatile sig_atomic_t caught; /* private member */
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};
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/* initialise sigevent system
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* takes:
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* - pointer to valid struct event_loop
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* - number of elements in passed in signals array
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* - array of frr_signal_t's describing signals to handle
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* and handlers to use for each signal
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*/
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extern void signal_init(struct event_loop *m, int sigc,
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struct frr_signal_t *signals);
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/*
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* Check whether any signals have been received and are pending. This is done
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* with the application's key signals blocked. The complete set of signals
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* is returned in 'setp', so the caller can restore them when appropriate.
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* If there are pending signals, returns 'true', 'false' otherwise.
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*/
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bool frr_sigevent_check(sigset_t *setp);
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/* check whether there are signals to handle, process any found */
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extern int frr_sigevent_process(void);
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/* Ensure we don't handle "application-type" signals on a secondary thread by
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* blocking these signals when creating threads
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*
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* NB: SIGSEGV, SIGABRT, etc. must be allowed on all threads or we get no
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* crashlogs. Since signals vary a little bit between platforms, below is a
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* list of known things to go to the main thread. Any unknown signals should
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* stay thread-local.
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*/
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static inline void frr_sigset_add_mainonly(sigset_t *blocksigs)
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{
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/* signals we actively handle */
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sigaddset(blocksigs, SIGHUP);
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sigaddset(blocksigs, SIGINT);
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sigaddset(blocksigs, SIGTERM);
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sigaddset(blocksigs, SIGUSR1);
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/* signals we don't actively use but that semantically belong */
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sigaddset(blocksigs, SIGUSR2);
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sigaddset(blocksigs, SIGQUIT);
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sigaddset(blocksigs, SIGCHLD);
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sigaddset(blocksigs, SIGPIPE);
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sigaddset(blocksigs, SIGTSTP);
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sigaddset(blocksigs, SIGTTIN);
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sigaddset(blocksigs, SIGTTOU);
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sigaddset(blocksigs, SIGWINCH);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _FRR_SIGNAL_H */
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