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222 lines
6.7 KiB
C
222 lines
6.7 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef prlog_h___
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#define prlog_h___
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#include "prtypes.h"
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PR_BEGIN_EXTERN_C
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/*
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** prlog.h -- Declare interfaces to NSPR's Logging service
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**
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** NSPR provides a logging service that is used by NSPR itself and is
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** available to client programs.
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**
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** To use the service from a client program, you should create a
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** PRLogModuleInfo structure by calling PR_NewLogModule(). After
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** creating the LogModule, you can write to the log using the PR_LOG()
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** macro.
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**
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** Initialization of the log service is handled by NSPR initialization.
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**
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** At execution time, you must enable the log service. To enable the
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** log service, set the environment variable: NSPR_LOG_MODULES
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** variable.
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**
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** NSPR_LOG_MODULES variable has the form:
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**
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** <moduleName>:<value>[, <moduleName>:<value>]*
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**
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** Where:
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** <moduleName> is the name passed to PR_NewLogModule().
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** <value> is a numeric constant, e.g. 5. This value is the maximum
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** value of a log event, enumerated by PRLogModuleLevel, that you want
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** written to the log.
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**
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** For example: to record all events of greater value than or equal to
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** PR_LOG_ERROR for a LogModule names "gizmo", say:
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**
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** set NSPR_LOG_MODULES=gizmo:2
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**
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** Note that you must specify the numeric value of PR_LOG_ERROR.
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**
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** Special LogModule names are provided for controlling NSPR's log
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** service at execution time. These controls should be set in the
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** NSPR_LOG_MODULES environment variable at execution time to affect
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** NSPR's log service for your application.
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**
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** The special LogModule "all" enables all LogModules. To enable all
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** LogModule calls to PR_LOG(), say:
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**
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** set NSPR_LOG_MODULES=all:5
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**
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** The special LogModule name "sync" tells the NSPR log service to do
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** unbuffered logging.
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**
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** The special LogModule name "bufsize:<size>" tells NSPR to set the
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** log buffer to <size>.
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**
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** The environment variable NSPR_LOG_FILE specifies the log file to use
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** unless the default of "stderr" is acceptable. For MS Windows
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** systems, NSPR_LOG_FILE can be set to a special value: "WinDebug"
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** (case sensitive). This value causes PR_LOG() output to be written
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** using the Windows API OutputDebugString(). OutputDebugString()
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** writes to the debugger window; some people find this helpful.
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**
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**
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** To put log messages in your programs, use the PR_LOG macro:
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**
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** PR_LOG(<module>, <level>, (<printfString>, <args>*));
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**
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** Where <module> is the address of a PRLogModuleInfo structure, and
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** <level> is one of the levels defined by the enumeration:
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** PRLogModuleLevel. <args> is a printf() style of argument list. That
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** is: (fmtstring, ...).
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**
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** Example:
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**
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** main() {
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** PRIntn one = 1;
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** PRLogModuleInfo * myLm = PR_NewLogModule("gizmo");
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** PR_LOG( myLm, PR_LOG_ALWAYS, ("Log this! %d\n", one));
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** return;
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** }
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**
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** Note the use of printf() style arguments as the third agrument(s) to
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** PR_LOG().
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**
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** After compiling and linking you application, set the environment:
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**
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** set NSPR_LOG_MODULES=gizmo:5
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** set NSPR_LOG_FILE=logfile.txt
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**
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** When you execute your application, the string "Log this! 1" will be
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** written to the file "logfile.txt".
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**
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** Note to NSPR engineers: a number of PRLogModuleInfo structures are
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** defined and initialized in prinit.c. See this module for ideas on
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** what to log where.
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**
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*/
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typedef enum PRLogModuleLevel {
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PR_LOG_NONE = 0, /* nothing */
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PR_LOG_ALWAYS = 1, /* always printed */
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PR_LOG_ERROR = 2, /* error messages */
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PR_LOG_WARNING = 3, /* warning messages */
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PR_LOG_DEBUG = 4, /* debug messages */
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PR_LOG_NOTICE = PR_LOG_DEBUG, /* notice messages */
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PR_LOG_WARN = PR_LOG_WARNING, /* warning messages */
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PR_LOG_MIN = PR_LOG_DEBUG, /* minimal debugging messages */
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PR_LOG_MAX = PR_LOG_DEBUG /* maximal debugging messages */
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} PRLogModuleLevel;
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/*
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** One of these structures is created for each module that uses logging.
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** "name" is the name of the module
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** "level" is the debugging level selected for that module
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*/
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typedef struct PRLogModuleInfo {
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const char *name;
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PRLogModuleLevel level;
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struct PRLogModuleInfo *next;
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} PRLogModuleInfo;
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/*
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** Create a new log module.
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*/
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NSPR_API(PRLogModuleInfo*) PR_NewLogModule(const char *name);
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/*
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** Set the file to use for logging. Returns PR_FALSE if the file cannot
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** be created
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*/
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NSPR_API(PRBool) PR_SetLogFile(const char *name);
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/*
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** Set the size of the logging buffer. If "buffer_size" is zero then the
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** logging becomes "synchronous" (or unbuffered).
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*/
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NSPR_API(void) PR_SetLogBuffering(PRIntn buffer_size);
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/*
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** Print a string to the log. "fmt" is a PR_snprintf format type. All
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** messages printed to the log are preceeded by the name of the thread
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** and a time stamp. Also, the routine provides a missing newline if one
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** is not provided.
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*/
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NSPR_API(void) PR_LogPrint(const char *fmt, ...);
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/*
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** Flush the log to its file.
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*/
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NSPR_API(void) PR_LogFlush(void);
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NSPR_API(void) PR_Assert(const char *s, const char *file, PRIntn ln);
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#if defined(DEBUG) || defined(FORCE_PR_LOG)
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#define PR_LOGGING 1
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#define PR_LOG_TEST(_module,_level) \
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((_module)->level >= (_level))
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/*
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** Log something.
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** "module" is the address of a PRLogModuleInfo structure
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** "level" is the desired logging level
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** "args" is a variable length list of arguments to print, in the following
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** format: ("printf style format string", ...)
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*/
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#define PR_LOG(_module,_level,_args) \
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PR_BEGIN_MACRO \
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if (PR_LOG_TEST(_module,_level)) { \
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PR_LogPrint _args; \
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} \
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PR_END_MACRO
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#else /* defined(DEBUG) || defined(FORCE_PR_LOG) */
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#undef PR_LOGGING
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#define PR_LOG_TEST(module,level) 0
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#define PR_LOG(module,level,args)
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#endif /* defined(DEBUG) || defined(FORCE_PR_LOG) */
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#ifndef NO_NSPR_10_SUPPORT
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#ifdef PR_LOGGING
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#define PR_LOG_BEGIN PR_LOG
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#define PR_LOG_END PR_LOG
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#define PR_LOG_DEFINE PR_NewLogModule
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#else
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#define PR_LOG_BEGIN(module,level,args)
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#define PR_LOG_END(module,level,args)
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#define PR_LOG_DEFINE(_name) NULL
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#endif /* PR_LOGGING */
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#endif /* NO_NSPR_10_SUPPORT */
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#if defined(DEBUG) || defined(FORCE_PR_ASSERT)
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#define PR_ASSERT(_expr) \
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((_expr)?((void)0):PR_Assert(# _expr,__FILE__,__LINE__))
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#define PR_NOT_REACHED(_reasonStr) \
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PR_Assert(_reasonStr,__FILE__,__LINE__)
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#else
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#define PR_ASSERT(expr) ((void) 0)
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#define PR_NOT_REACHED(reasonStr)
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#endif /* defined(DEBUG) || defined(FORCE_PR_ASSERT) */
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PR_END_EXTERN_C
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#endif /* prlog_h___ */
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