Fix daemon resets SIGHUP #173
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When using the daemon utility and flag YAZ_DAEMON_LOG_REOPEN to allow for SIGHUP to re-open log files, it would only work once as the SIGHUP handler action was cleared. Now it remains enabled, so that SIGHUP can be received multiple times.
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Pull request overview
This PR fixes a bug where the SIGHUP signal handler for log file reopening would only work once. The issue was caused by using the deprecated signal() function which has platform-dependent behavior that may reset the handler to default after the first invocation.
Changes:
- Replaced
signal()withsigaction()for SIGHUP handler registration to ensure handler persists across multiple signal invocations - Added logging statement to track when SIGHUP is received
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| sigemptyset(&sa.sa_mask); | ||
| sa.sa_handler = log_reopen_handler; | ||
| sa.sa_flags = 0; | ||
| sigaction(SIGHUP, &sa, 0); |
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The third argument to sigaction should be NULL instead of 0 for better code clarity. While 0 is technically valid, using NULL makes it explicit that this is a pointer argument and improves code readability.
Suggested change
| sigaction(SIGHUP, &sa, 0); | |
| sigaction(SIGHUP, &sa, NULL); |
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When using the daemon utility and flag YAZ_DAEMON_LOG_REOPEN to allow for SIGHUP to re-open log files, it would only work once as the SIGHUP handler action was cleared. Now it remains enabled, so that SIGHUP can be received multiple times.