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dae1184302
I see random ENOTCONN failures in xfstest generic/013 and generic/014
in my branch, but earliest on the 2nd run - takes ~12hours to get
the issue, but then there are no further information logged.
ENOTCONN points to a daemon crash - I need backtraces and a core dump.
This adds optional handling of fatal signals to print a core dump
and optional syslog logging with these new public functions:
fuse_set_fail_signal_handlers()
In addition to the existing fuse_set_signal_handlers(). This is not
enabled together with fuse_set_signal_handlers(), as it is change
in behavior and file systems might already have their own fatal
handlers.
fuse_log_enable_syslog
Print logs to syslog instead of stderr
fuse_log_close_syslog
Close syslog (for now just does closelog())
Code in fuse_signals.c is also updated, to be an array of signals,
and setting signal handlers is now down with a for-loop instead
of one hand coded set_one_signal_handler() per signal.
95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
/*
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FUSE: Filesystem in Userspace
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Copyright (C) 2019 Red Hat, Inc.
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This program can be distributed under the terms of the GNU LGPLv2.
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See the file COPYING.LIB.
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*/
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#ifndef FUSE_LOG_H_
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#define FUSE_LOG_H_
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/** @file
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*
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* This file defines the logging interface of FUSE
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*/
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#include <stdarg.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Log severity level
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*
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* These levels correspond to syslog(2) log levels since they are widely used.
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*/
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enum fuse_log_level {
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FUSE_LOG_EMERG,
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FUSE_LOG_ALERT,
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FUSE_LOG_CRIT,
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FUSE_LOG_ERR,
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FUSE_LOG_WARNING,
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FUSE_LOG_NOTICE,
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FUSE_LOG_INFO,
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FUSE_LOG_DEBUG
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};
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/**
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* Log message handler function.
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*
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* This function must be thread-safe. It may be called from any libfuse
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* function, including fuse_parse_cmdline() and other functions invoked before
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* a FUSE filesystem is created.
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*
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* Install a custom log message handler function using fuse_set_log_func().
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*
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* @param level log severity level
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* @param fmt sprintf-style format string including newline
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* @param ap format string arguments
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*/
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typedef void (*fuse_log_func_t)(enum fuse_log_level level,
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const char *fmt, va_list ap);
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/**
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* Install a custom log handler function.
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*
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* Log messages are emitted by libfuse functions to report errors and debug
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* information. Messages are printed to stderr by default but this can be
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* overridden by installing a custom log message handler function.
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*
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* The log message handler function is global and affects all FUSE filesystems
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* created within this process.
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*
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* @param func a custom log message handler function or NULL to revert to
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* the default
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*/
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void fuse_set_log_func(fuse_log_func_t func);
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/**
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* Emit a log message
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*
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* @param level severity level (FUSE_LOG_ERR, FUSE_LOG_DEBUG, etc)
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* @param fmt sprintf-style format string including newline
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*/
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void fuse_log(enum fuse_log_level level, const char *fmt, ...);
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/**
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* Switch default log handler from stderr to syslog
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*
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* Passed options are according to 'man 3 openlog'
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*/
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void fuse_log_enable_syslog(const char *ident, int option, int facility);
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/**
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* To be called at teardown to close syslog.
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*/
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void fuse_log_close_syslog(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* FUSE_LOG_H_ */
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