86 lines
2.3 KiB
C++
86 lines
2.3 KiB
C++
#ifndef Log_included
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#define Log_included
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#include "Boolean.h"
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#include <stdarg.h>
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// Log is an augmented syslog(3C). There are three log levels, DEBUG
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// INFO and LOG. Logging can be done to the foreground (stderr) or
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// to the background (syslog).
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//
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// Control interface:
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//
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// debug(), info(), error() control the log level.
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// foreground(), background() control where log messages go.
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// name() sets the program's name (i.e., fam)
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//
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// Log interface:
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//
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// debug(fmt, ...) log at LOG_DEBUG level
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// info(fmt, ...) log at LOG_INFO level
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// error(fmt, ...) log at LOG_ERR level
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// perror(fmt, ...) log at LOG_ERR, append system error string
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//
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// All the log interface routines take printf-like arguments. In
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// addition, they all recognizer "%m", which substitutes the system
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// error string. "%m" works even when logging to foreground.
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//
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// When NDEBUG is not defined, Log.C also implements a replacement
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// for the libc function __assert(). The replacement function writes
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// the failed assertion message to the current log (i.e., stderr or
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// syslog), then sets its uid to 0, creates a directory in /usr/tmp,
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// logs the name of the directory, and chdir() to it so the core file
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// can be found.
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class Log {
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public:
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enum LogLevel { CRITICAL = 0, ERROR = 1, INFO = 2, DEBUG = 3 };
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#ifdef NO_LEAKS
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Log();
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~Log();
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#endif
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// Message logging functions. Three different priorities.
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static void debug(const char *fmt, ...);
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static void info(const char *fmt, ...);
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static void error(const char *fmt, ...);
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static void critical(const char *fmt, ...);
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// perror() is like error() but appends system error string.
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static void perror(const char *format, ...);
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// Control functions
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static void debug();
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static void info();
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static void error();
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static void foreground();
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static void background();
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static void name(const char *);
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private:
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static void vlog(LogLevel, const char *format, va_list);
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static void vfglog(LogLevel, const char *format, va_list args);
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static LogLevel level;
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static Boolean log_to_stderr;
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static const char *program_name;
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static Boolean syslog_open;
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static unsigned count;
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};
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#ifdef NO_LEAKS
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static Log Log_instance;
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#endif
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#endif /* !Log_included */
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