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e3830e909d
Until now, fatal_signal_fork() has simply disabled all the fatal signal callback hooks. This worked fine, because a daemon process forked only once and the parent didn't do much before it exited. But upcoming commits will introduce a --monitor option, which requires processes to fork multiple times. Sometimes the parent process will fork, then run for a while, then fork again. It's not good to disable the hooks in the child process in such a case, because that prevents e.g. pidfiles from being removed at the child's exit. So this commit changes the semantics of fatal_signal_fork() to just clearing out hooks. After hooks are cleared, new hooks can be added and will be executed on process termination in the usual way. This commit also introduces a cancellation callback function so that a canceled hook can free resources.
43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010 Nicira Networks.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef FATAL_SIGNAL_H
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#define FATAL_SIGNAL_H 1
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#include <stdbool.h>
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/* Basic interface. */
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void fatal_signal_add_hook(void (*hook_cb)(void *aux),
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void (*cancel_cb)(void *aux), void *aux,
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bool run_at_exit);
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void fatal_signal_fork(void);
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void fatal_signal_run(void);
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void fatal_signal_wait(void);
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/* Convenience functions for unlinking files upon termination.
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*
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* These functions also unlink the files upon normal process termination via
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* exit(). */
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void fatal_signal_add_file_to_unlink(const char *);
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void fatal_signal_remove_file_to_unlink(const char *);
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int fatal_signal_unlink_file_now(const char *);
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/* Interface for other code that catches one of our signals and needs to pass
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* it through. */
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void fatal_signal_handler(int sig_nr);
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#endif /* fatal-signal.h */
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