mirror of https://gitee.com/openkylin/qemu.git
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*
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* FUSE: Filesystem in Userspace
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* Copyright (C) 2019 Red Hat, Inc.
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*
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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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/**
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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, const char *fmt,
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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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#endif /* FUSE_LOG_H_ */
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