/usr/include/ace/Log_Msg.h is in libace-dev 6.3.3+dfsg-1.
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//=============================================================================
/**
* @file Log_Msg.h
*
* @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
*/
//=============================================================================
#ifndef ACE_LOG_MSG_H
#define ACE_LOG_MSG_H
#include /**/ "ace/pre.h"
// This stuff must come first to avoid problems with circular
// headers...
// ... but ACE_NDEBUG and ACE_NLOGGING can come from the config.h file, so
// pull that one early.
#include /**/ "ace/config-all.h"
#include /**/ "ace/ACE_export.h"
#include "ace/Global_Macros.h"
#include "ace/Default_Constants.h"
#include "ace/Log_Priority.h"
#include "ace/os_include/os_limits.h"
#include "ace/Synch_Traits.h"
// The ACE_ASSERT macro used to be defined here, include ace/Assert.h
// for backwards compatibility.
#include "ace/Assert.h"
#if defined (ACE_NLOGGING)
#if !defined (ACE_HEX_DUMP)
# define ACE_HEX_DUMP(X) do {} while (0)
#endif
#if !defined (ACE_RETURN)
# define ACE_RETURN(Y) do { return (Y); } while (0)
#endif
#if !defined (ACE_ERROR_RETURN)
# define ACE_ERROR_RETURN(X, Y) return (Y)
#endif
#if !defined (ACE_ERROR_BREAK)
# define ACE_ERROR_BREAK(X) { break; }
#endif
#if !defined (ACE_ERROR)
# define ACE_ERROR(X) do {} while (0)
#endif
#if !defined (ACE_DEBUG)
# define ACE_DEBUG(X) do {} while (0)
#endif
#if !defined (ACE_ERROR_INIT)
# define ACE_ERROR_INIT(VALUE, FLAGS)
#endif
#else
#if !defined (ACE_HEX_DUMP)
#define ACE_HEX_DUMP(X) \
do { \
int const __ace_error = ACE_Log_Msg::last_error_adapter (); \
ACE_Log_Msg *ace___ = ACE_Log_Msg::instance (); \
ace___->conditional_set (__FILE__, __LINE__, 0, __ace_error); \
ace___->log_hexdump X; \
} while (0)
#endif
#if !defined (ACE_RETURN)
#define ACE_RETURN(Y) \
do { \
int const __ace_error = ACE_Log_Msg::last_error_adapter (); \
ACE_Log_Msg *ace___ = ACE_Log_Msg::instance (); \
ace___->set (__FILE__, __LINE__, Y, __ace_error, ace___->restart (), \
ace___->msg_ostream (), ace___->msg_callback ()); \
return Y; \
} while (0)
#endif
#if !defined (ACE_ERROR_RETURN)
#define ACE_ERROR_RETURN(X, Y) \
do { \
int const __ace_error = ACE_Log_Msg::last_error_adapter (); \
ACE_Log_Msg *ace___ = ACE_Log_Msg::instance (); \
ace___->conditional_set (__FILE__, __LINE__, Y, __ace_error); \
ace___->log X; \
return Y; \
} while (0)
#endif
#if !defined (ACE_ERROR)
#define ACE_ERROR(X) \
do { \
int const __ace_error = ACE_Log_Msg::last_error_adapter (); \
ACE_Log_Msg *ace___ = ACE_Log_Msg::instance (); \
ace___->conditional_set (__FILE__, __LINE__, -1, __ace_error); \
ace___->log X; \
} while (0)
#endif
#if !defined (ACE_DEBUG)
#define ACE_DEBUG(X) \
do { \
int const __ace_error = ACE_Log_Msg::last_error_adapter (); \
ACE_Log_Msg *ace___ = ACE_Log_Msg::instance (); \
ace___->conditional_set (__FILE__, __LINE__, 0, __ace_error); \
ace___->log X; \
} while (0)
#endif
#if !defined (ACE_ERROR_INIT)
#define ACE_ERROR_INIT(VALUE, FLAGS) \
do { \
ACE_Log_Msg *ace___ = ACE_Log_Msg::instance (); \
ace___->set_flags (FLAGS); \
ace___->op_status (VALUE); \
} while (0)
#endif
#if !defined (ACE_ERROR_BREAK)
#define ACE_ERROR_BREAK(X) { ACE_ERROR (X); break; }
#endif
#endif /* ACE_NLOGGING */
#include "ace/OS_Log_Msg_Attributes.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
// These workarounds are necessary for nasty libraries or platforms
// that #define STDERR or THREAD (e.g. LynxOS). We simply #undef
// these macros as there is no way to save the macro definition using
// the pre-processor. See Bugzilla Bug #299 for more info.
#if defined (STDERR)
# undef STDERR
#endif /* STDERR */
#if defined (THREAD)
# undef THREAD
#endif /* THREAD */
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
class ACE_Log_Msg_Callback;
class ACE_Log_Msg_Backend;
// ****************************************************************
#define ACE_LOG_MSG ACE_Log_Msg::instance ()
// Forward declaration
class ACE_Thread_Descriptor;
class ACE_Log_Record;
class ACE_Log_Category_TSS;
template<typename M, typename T> class ACE_Atomic_Op;
/**
* @class ACE_Log_Msg
*
* @brief Provides a variable length argument message logging
* abstraction.
*
* This class is very flexible since it allows formatted error
* messages to be printed in a thread-safe manner to various
* locations, such as stderr, cerr, a distributed logger, etc. The
* current message is also kept in a thread-specific storage location
* (threads spawned using ACE_Thread_Manager automatically get an
* ACE_Log_Msg object that inherits the spawning thread's settings),
* which can be used to communicate errors between framework methods
* and callers. A message is logged by the log() method, only if the
* message priority is currently enabled. Moreover, only the current
* log message is stored here -- it will be overwritten by the
* subsequent call to log().
*
* The ACE_Log_Msg class uses two priority masks to control its
* logging behavior. The @c priority_mask_ object attribute is
* thread- specific and specifies the priority levels logged by the
* thread. The @c process_priority_mask_ class attribute is not
* thread-specific and specifies the priority levels that will be
* logged by all threads in the process. By default, all levels are
* disabled for @c priority_mask_ and all levels are enabled for @c
* process_priority_mask_ (i.e. the process-wide mask controls the
* settings, and each instance can expand on it if desired). Both
* priority masks can be modified using the priority_mask() method of
* this class.
*/
class ACE_Export ACE_Log_Msg
{
public:
// Logger Flags.
enum
{
/// Write messages to stderr.
STDERR = 1,
/// Write messages to the local client logger daemon.
LOGGER = 2,
/// Write messages to the ostream * stored in thread-specific
/// storage.
OSTREAM = 4,
/// Write messages to the callback object.
MSG_CALLBACK = 8,
/// Display messages in a verbose manner.
VERBOSE = 16,
/// Display messages in a less verbose manner (i.e., only print
/// information that can change between calls).
VERBOSE_LITE = 32,
/// Do not print messages at all (just leave in thread-specific
/// storage for later inspection).
SILENT = 64,
/// Write messages to the system's event log.
SYSLOG = 128,
/// Write messages to the user provided backend
CUSTOM = 256
};
// = Initialization and termination routines.
/// Returns a pointer to the Singleton.
static ACE_Log_Msg *instance (void);
/// Returns last error.
static int last_error_adapter (void);
/// Returns non-null if an ACE_Log_Msg exists for the calling thread.
static int exists (void);
/// Returns the current program name used for logging.
static const ACE_TCHAR * program_name (void);
/// Clears the flag from the default priority mask used to
/// initialize ACE_Log_Msg instances.
static void disable_debug_messages (ACE_Log_Priority priority = LM_DEBUG);
/// Sets the flag in the default priority mask used to initialize
/// ACE_Log_Msg instances.
static void enable_debug_messages (ACE_Log_Priority priority = LM_DEBUG);
/// Initialize logger.
ACE_Log_Msg (void);
/// cleanup logger.
~ACE_Log_Msg (void);
/// Initialize the ACE logging facility.
/**
* Initialize the ACE logging facility. Supplies the program name
* that is available to each logging message call. Default arguments
* set up logging to STDERR only.
*
* @param prog_name The name of the calling program.
* @param options_flags A bitwise-or of options flags used to set the
* initial behavior and logging sink(s). (see the
* enum above for the valid values).
* @param logger_key The name of ACE_FIFO rendezvous point where the
* local client logger daemon is listening for logging
* messages if the LOGGER bit is set in the @a flags
* argument. If the SYSLOG bit is set in @a flags,
* @a logger_key is the source/program name specified
* in the syslog facility (UNIX/Linux) or the Windows
* event log (Windows). In the SYSLOG case, if
* @a logger_key is 0, @a prog_name is used.
*/
int open (const ACE_TCHAR *prog_name,
u_long options_flags = ACE_Log_Msg::STDERR,
const ACE_TCHAR *logger_key = 0);
// = Set/get the options flags.
/**
* Enable the bits in the logger's options flags.
*/
void set_flags (u_long f);
/**
* Disable the bits in the logger's options flags.
*/
void clr_flags (u_long f);
/**
* Return the bits in the logger's options flags.
*/
u_long flags (void);
/** @name Allow apps to acquire and release internal synchronization
* lock
*
* This lock is used internally by the ACE_Log_Msg
* implementation. By exporting the lock, applications can hold the
* lock atomically over a number of calls to ACE_Log_Msg.
*/
//@{
/// Acquire the internal lock.
int acquire (void);
/// Release the internal lock.
int release (void);
//@}
/// Call after doing a @c fork() to resynchronize the process id and
/// @c program_name_ variables.
void sync (const ACE_TCHAR *program_name);
// = Set/get methods. Note that these are non-static and thus will
// be thread-specific.
/// Set the result of the operation status (by convention, -1 means
/// error).
void op_status (int status);
/// Get the result of the operation status (by convention, -1 means
/// error).
int op_status (void) const;
/// Set the value of the errnum (by convention this corresponds to
/// errno).
void errnum (int);
/// Get the value of the errnum (by convention this corresponds to
/// errno).
int errnum (void) const;
/// Set the line number where an error occurred.
void linenum (int);
/// Get the line number where an error occurred.
int linenum (void) const;
/// Set the file name where an error occurred.
void file (const char *);
/// Get the file name where an error occurred.
const char *file (void);
/// Set the message that describes what type of error occurred.
void msg (const ACE_TCHAR *);
/// Get the message that describes what type of error occurred.
const ACE_TCHAR *msg (void);
/// Set the field that indicates whether interrupted calls should be
/// restarted.
void restart (bool r);
/// Get the field that indicates whether interrupted calls should be
/// restarted.
bool restart (void) const;
// = Notice that the following two function is equivalent to
// "void msg_ostream (HANDLE)" and "HANDLE msg_ostream (void)"
// on Windows CE. There is no <iostream.h> support on CE.
/// Update the ostream without overwriting the delete_ostream_ flag.
void msg_ostream (ACE_OSTREAM_TYPE *);
/**
* delete_stream == true, forces Log_Msg.h to delete the stream in
* its own ~dtor (assumes control of the stream)
* use only with proper ostream (eg: fstream), not (cout, cerr)
*/
void msg_ostream (ACE_OSTREAM_TYPE *, bool delete_ostream);
/// Get the ostream that is used to print error messages.
ACE_OSTREAM_TYPE *msg_ostream (void) const;
/**
* Set a new callback object and return the existing callback to
* allow "chaining". Note that ACE_Log_Msg_Callback objects are not
* inherited when spawning a new thread, so you'll need to reset
* them in each thread.
*/
ACE_Log_Msg_Callback *msg_callback (ACE_Log_Msg_Callback *c);
ACE_Log_Msg_Callback *msg_callback (void) const;
/**
* Set a new backend object and return the existing backend to
* allow "chaining". Note that as opposed to ACE_Log_Msg_Callback,
* ACE_Log_Msg_Backend is a per-process entity.
*
* @note Be aware that because of the current architecture there is
* no guarantee that open (), reset () and close () will be called
* on a backend object.
*
*/
static ACE_Log_Msg_Backend *msg_backend (ACE_Log_Msg_Backend *b);
static ACE_Log_Msg_Backend *msg_backend (void);
/// Nesting depth increment.
int inc (void);
/// Nesting depth decrement.
int dec (void);
/// Get trace depth.
int trace_depth (void) const;
/// Set trace depth.
void trace_depth (int);
/// Get trace active status.
bool trace_active (void) const;
/// Set trace active status.
void trace_active (bool value);
/// Get the TSS thread descriptor.
ACE_Thread_Descriptor *thr_desc (void) const;
/**
* Set the TSS thread descriptor. This method will call
* td->acquire_release to block execution until this call
* return.
*/
void thr_desc (ACE_Thread_Descriptor *td);
/// Stop tracing status on a per-thread basis...
void stop_tracing (void);
/// Start tracing status on a per-thread basis...
void start_tracing (void);
/// Query tracing status on a per-thread basis...
bool tracing_enabled (void) const;
typedef enum
{
PROCESS = 0,
THREAD = 1
} MASK_TYPE;
// = Get/set the priority mask.
/// Get the current ACE_Log_Priority mask.
u_long priority_mask (MASK_TYPE = THREAD);
/// Set the ACE_Log_Priority mask, returns original mask.
u_long priority_mask (u_long, MASK_TYPE = THREAD);
/// Return true if the requested priority is enabled.
int log_priority_enabled (ACE_Log_Priority log_priority);
/// Return true if the requested priority is enabled.
int log_priority_enabled (ACE_Log_Priority log_priority,
const char *,
...);
#if defined (ACE_USES_WCHAR)
// We are not using ACE_TCHAR for this since ACE_HEX_DUMP
// doesn't take in a ACE_TCHAR. log_hexdump takes in a char
// string, so this must be able to take in a char string even
// when using ACE_USES_WCHAR.
/// Return true if the requested priority is enabled.
int log_priority_enabled (ACE_Log_Priority log_priority,
const wchar_t *,
...);
#endif /* ACE_USES_WCHAR */
/// Optimize reading of the pid (avoids a system call if the value is
/// cached...).
pid_t getpid (void) const;
/// Get the name of the local host.
const ACE_TCHAR *local_host (void) const;
/// Set the name of the local host.
void local_host (const ACE_TCHAR *);
/**
* Set the line number, file name, operational status, error number,
* restart flag, ostream, and the callback object. This combines
* all the other set methods into a single method.
*/
void set (const char *file,
int line,
int op_status = -1,
int errnum = 0,
bool restart = true,
ACE_OSTREAM_TYPE *os = 0,
ACE_Log_Msg_Callback *c = 0);
/// These values are only actually set if the requested priority is
/// enabled.
void conditional_set (const char *file,
int line,
int op_status,
int errnum);
/**
* Format a message to the thread-safe ACE logging mechanism. Valid
* options (prefixed by '%', as in printf format strings) include:
* - 'A': print an ACE_timer_t value (which could be either double
* or ACE_UINT32.)
* - 'a': abort the program at this point abruptly.
* - 'b': print a ssize_t value
* - 'B': print a size_t value
* - 'c': print a character
* - 'C': print a char* character string (also see s and W)
* - 'i', 'd': print a decimal number
* - 'I': indent according to nesting depth (obtained from
* ACE_Trace::get_nesting_indent()).
* - 'e', 'E', 'f', 'F', 'g', 'G': print a double
* - 'l': print line number where an error occurred.
* - 'M': print the name of the priority of the message.
* - 'm': return the message corresponding to errno value, e.g., as
* done by strerror()
* - 'N': print file name where the error occurred.
* - 'n': print the name of the program (or "<unknown>" if not set)
* - 'o': print as an octal number
* - 'P': print out the current process id
* - 'p': print out the appropriate errno message from sys_errlist,
* e.g., as done by perror()
* - 'Q': print out the uint64 number
* - 'q': print out the int64 number
* - '@': print a void* pointer (in hexadecimal)
* - 'r': call the function pointed to by the corresponding argument
* - 'R': print return status
* - 'S': print out the appropriate signal message corresponding
* to var-argument, e.g., as done by strsignal()
* - 's': prints a ACE_TCHAR* character string (also see C and W)
* - 'T': print timestamp in hour:minute:sec:usec format (plain option,
* i.e. without any flags, prints system supplied timestamp;
* with '#' flag added expects ACE_Time_Value* in argument list)
* - 'D': print timestamp as Weekday Month day year hour:minute:sec.usec
* (plain option, i.e. without any flags, prints system supplied
* timestamp; with '#' flag added expects ACE_Time_Value* in
* argument list)
* - 't': print thread id (1 if single-threaded)
* - 'u': print as unsigned int
* - 'w': prints a wide character
* - 'W': prints a wchar_t* character string (also see C and s)
* - 'x': print as a hex number
* - 'X': print as a hex number
* - 'z': print an ACE_OS::WChar character
* - 'Z': print an ACE_OS::WChar character string
* - ':': print a time_t value as an integral number
* - '%': print out a single percent sign, '%'
* - '?': print out stack trace (see Stack_Trace.h header comments)
*/
ssize_t log (ACE_Log_Priority priority, const ACE_TCHAR *format, ...);
#if defined (ACE_HAS_WCHAR)
ssize_t log (ACE_Log_Priority priority, const ACE_ANTI_TCHAR *format, ...);
#endif /* ACE_HAS_WCHAR */
/**
* An alternative logging mechanism that makes it possible to
* integrate variable argument lists from other logging mechanisms
* into the ACE mechanism.
*/
ssize_t log (const ACE_TCHAR *format,
ACE_Log_Priority priority,
va_list argp,
ACE_Log_Category_TSS* category=0);
/// Log a custom built log record to the currently enabled logging
/// sinks.
ssize_t log (ACE_Log_Record &log_record,
int suppress_stderr = 0);
/**
* Method to log hex dump. This is useful for debugging. Calls
* log() to do the actual print, but formats first to make the chars
* printable.
*/
int log_hexdump (ACE_Log_Priority log_priority,
const char *buffer,
size_t size,
const ACE_TCHAR *text = 0,
ACE_Log_Category_TSS* category=0);
/**
* Init hook, create a Log_Msg_Attribute object, initialize its
* attributes from the TSS Log_Msg and save the object in the
* @a attributes argument
*/
static void init_hook (ACE_OS_Log_Msg_Attributes &attributes
# if defined (ACE_HAS_WIN32_STRUCTURAL_EXCEPTIONS)
, ACE_SEH_EXCEPT_HANDLER selector = 0
, ACE_SEH_EXCEPT_HANDLER handler = 0
# endif /* ACE_HAS_WIN32_STRUCTURAL_EXCEPTIONS */
);
/**
* Inherit hook, the @a attributes field is a ACE_OS_Log_Msg_Attributes
* object, invoke the inherit_log_msg() method on it, then destroy
* it and set the @a attribute argument to 0.
*/
static void inherit_hook (ACE_OS_Thread_Descriptor *thr_desc,
ACE_OS_Log_Msg_Attributes &attributes);
/// Dump the state of an object.
void dump (void) const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
private:
void cleanup_ostream ();
/// Status of operation (-1 means failure, >= 0 means success).
int status_;
/// Type of error that occurred (see <sys/errno.h>).
int errnum_;
/// Line number where the error occurred.
int linenum_;
/// File where the error occurred.
char file_[MAXPATHLEN + 1];
/// The log message, which resides in thread-specific storage. Note
/// that only the current log message is stored here -- it will be
/// overwritten by the subsequent call to log().
ACE_TCHAR* msg_; // Add one for NUL-terminator.
/// Indicates whether we should restart system calls that are
/// interrupted.
bool restart_;
/// The ostream where logging messages can be written.
ACE_OSTREAM_TYPE *ostream_;
/// This pointer is 0 if we are not reference counting (the user has not
/// passed "true" for the delete_ostream argument to msg_ostream).
/// If we are reference counting, this points to a shared count that will
/// be deleted when it reaches zero. Since we want optional but shared
/// ownership neither std::auto_ptr nor ACE_Strong_Bound_Ptr have the right
/// semantics. *Bound_Ptr also doesn't take advantage of Atomic_Op.
typedef ACE_Atomic_Op<ACE_SYNCH_MUTEX, unsigned long> Atomic_ULong;
Atomic_ULong *ostream_refcount_;
/// The callback object.
ACE_Log_Msg_Callback *msg_callback_;
/// Depth of the nesting for printing traces.
int trace_depth_;
/// Are we already within an ACE_Trace constructor call?
bool trace_active_;
/// Are we allowing tracing in this thread?
bool tracing_enabled_;
/**
* If we're running in the context of an ACE_Thread_Manager this
* will point to the thread descriptor adapter which holds the
* thread descriptor of the thread. This can be used to rapidly
* access all thread data kept in ACE_Thread_Descriptor.
*/
ACE_Thread_Descriptor *thr_desc_;
/**
* Keeps track of all the per-thread ACE_Log_Priority values that
* are currently enabled. Default is for all logging priorities to
* be disabled.
*/
u_long priority_mask_;
/// Always timestamp?
int timestamp_;
// = The following fields are *not* kept in thread-specific storage.
// We only want one instance for the entire process!
/**
* Keeps track of all the per-process ACE_Log_Priority values that
* are currently enabled. Default is for all logging priorities to
* be enabled.
*/
static u_long process_priority_mask_;
/// Records the program name.
static const ACE_TCHAR *program_name_;
/// Name of the local host (used when printing messages).
static const ACE_TCHAR *local_host_;
/// Options flags used to hold the logger flag options, e.g.,
/// STDERR, LOGGER, OSTREAM, MSG_CALLBACK, etc.
static u_long flags_;
/// Offset of msg_[].
static ptrdiff_t msg_off_;
/**
* Number of existing ACE_Log_Msg instances; when 0, delete program/host
* names
*/
static int instance_count_;
/**
* Priority mask to use for each new instance
*/
static u_long default_priority_mask_;
/// Anonymous struct since there will only be one instance. This
/// struct keeps information stored away in case we actually end up
/// calling log() if the log priority is correct.
struct
{
bool is_set_;
const char *file_;
int line_;
int op_status_;
int errnum_;
} conditional_values_;
#if defined (ACE_MT_SAFE) && (ACE_MT_SAFE != 0)
static bool key_created_;
#endif /* ACE_MT_SAFE */
/// For cleanup, at program termination.
static void close (void);
/// Decouple the OS layer from the ACE_Log_Msg layer.
static void sync_hook (const ACE_TCHAR *prg_name);
/// Return the TSS singleton thread descriptor
static ACE_OS_Thread_Descriptor *thr_desc_hook (void);
//friend void ACE_OS::cleanup_tss (const u_int);
// = Disallow these operations.
ACE_Log_Msg &operator= (const ACE_Log_Msg &);
ACE_Log_Msg (const ACE_Log_Msg &);
};
ACE_END_VERSIONED_NAMESPACE_DECL
#if defined (ACE_MT_SAFE) && (ACE_MT_SAFE != 0)
# if defined (ACE_HAS_THREAD_SPECIFIC_STORAGE) || \
defined (ACE_HAS_TSS_EMULATION)
/* static */
# if defined (ACE_HAS_THR_C_DEST)
# define LOCAL_EXTERN_PREFIX extern "C"
# else
# define LOCAL_EXTERN_PREFIX
# endif /* ACE_HAS_THR_C_DEST */
#if (defined (ACE_HAS_VERSIONED_NAMESPACE) && ACE_HAS_VERSIONED_NAMESPACE == 1)
# define ACE_TSS_CLEANUP_NAME ACE_PREPROC_CONCATENATE(ACE_,ACE_PREPROC_CONCATENATE(ACE_VERSIONED_NAMESPACE_NAME, _TSS_cleanup))
#else
# define ACE_TSS_CLEANUP_NAME ACE_TSS_cleanup
#endif /* ACE_HAS_VERSIONED_NAMESPACE == 1 */
LOCAL_EXTERN_PREFIX
void
ACE_TSS_CLEANUP_NAME (void *ptr);
# endif /* ACE_HAS_THREAD_SPECIFIC_STORAGE || ACE_HAS_TSS_EMULATION */
#endif /* ACE_MT_SAFE */
#if defined (__ACE_INLINE__)
#include "ace/Log_Msg.inl"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /* ACE_LOG_MSG_H */
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