ACE
6.1.6
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Provides a variable length argument message logging abstraction. More...
#include <Log_Msg.h>
Public Types | |
enum | { STDERR = 1, LOGGER = 2, OSTREAM = 4, MSG_CALLBACK = 8, VERBOSE = 16, VERBOSE_LITE = 32, SILENT = 64, SYSLOG = 128, CUSTOM = 256 } |
enum | MASK_TYPE { PROCESS = 0, THREAD = 1 } |
Public Member Functions | |
ACE_Log_Msg (void) | |
Initialize logger. | |
~ACE_Log_Msg (void) | |
cleanup logger. | |
int | open (const ACE_TCHAR *prog_name, u_long options_flags=ACE_Log_Msg::STDERR, const ACE_TCHAR *logger_key=0) |
Initialize the ACE logging facility. | |
void | set_flags (u_long f) |
void | clr_flags (u_long f) |
u_long | flags (void) |
void | sync (const ACE_TCHAR *program_name) |
void | op_status (int status) |
int | op_status (void) const |
void | errnum (int) |
int | errnum (void) const |
void | linenum (int) |
Set the line number where an error occurred. | |
int | linenum (void) const |
Get the line number where an error occurred. | |
void | file (const char *) |
Set the file name where an error occurred. | |
const char * | file (void) |
Get the file name where an error occurred. | |
void | msg (const ACE_TCHAR *) |
Set the message that describes what type of error occurred. | |
const ACE_TCHAR * | msg (void) |
Get the message that describes what type of error occurred. | |
void | restart (bool r) |
bool | restart (void) const |
void | msg_ostream (ACE_OSTREAM_TYPE *) |
Update the ostream without overwriting the delete_ostream_ flag. | |
void | msg_ostream (ACE_OSTREAM_TYPE *, bool delete_ostream) |
ACE_OSTREAM_TYPE * | msg_ostream (void) const |
Get the ostream that is used to print error messages. | |
ACE_Log_Msg_Callback * | msg_callback (ACE_Log_Msg_Callback *c) |
ACE_Log_Msg_Callback * | msg_callback (void) const |
int | inc (void) |
Nesting depth increment. | |
int | dec (void) |
Nesting depth decrement. | |
int | trace_depth (void) const |
Get trace depth. | |
void | trace_depth (int) |
Set trace depth. | |
bool | trace_active (void) const |
Get trace active status. | |
void | trace_active (bool value) |
Set trace active status. | |
ACE_Thread_Descriptor * | thr_desc (void) const |
Get the TSS thread descriptor. | |
void | thr_desc (ACE_Thread_Descriptor *td) |
void | stop_tracing (void) |
Stop tracing status on a per-thread basis... | |
void | start_tracing (void) |
Start tracing status on a per-thread basis... | |
bool | tracing_enabled (void) const |
Query tracing status on a per-thread basis... | |
u_long | priority_mask (MASK_TYPE=THREAD) |
Get the current ACE_Log_Priority mask. | |
u_long | priority_mask (u_long, MASK_TYPE=THREAD) |
Set the ACE_Log_Priority mask, returns original mask. | |
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 *,...) |
Return true if the requested priority is enabled. | |
pid_t | getpid (void) const |
const ACE_TCHAR * | local_host (void) const |
Get the name of the local host. | |
void | local_host (const ACE_TCHAR *) |
Set the name of the local host. | |
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) |
void | conditional_set (const char *file, int line, int op_status, int errnum) |
ssize_t | log (ACE_Log_Priority priority, const ACE_TCHAR *format,...) |
ssize_t | log (ACE_Log_Priority priority, const ACE_ANTI_TCHAR *format,...) |
ssize_t | log (const ACE_TCHAR *format, ACE_Log_Priority priority, va_list argp) |
ssize_t | log (ACE_Log_Record &log_record, int suppress_stderr=0) |
int | log_hexdump (ACE_Log_Priority log_priority, const char *buffer, size_t size, const ACE_TCHAR *text=0) |
void | dump (void) const |
Dump the state of an object. | |
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. | |
int | acquire (void) |
Acquire the internal lock. | |
int | release (void) |
Release the internal lock. |
Static Public Member Functions | |
static ACE_Log_Msg * | instance (void) |
Returns a pointer to the Singleton. | |
static int | last_error_adapter (void) |
Returns last error. | |
static int | exists (void) |
Returns non-null if an ACE_Log_Msg exists for the calling thread. | |
static const ACE_TCHAR * | program_name (void) |
Returns the current program name used for logging. | |
static void | disable_debug_messages (ACE_Log_Priority priority=LM_DEBUG) |
static void | enable_debug_messages (ACE_Log_Priority priority=LM_DEBUG) |
static ACE_Log_Msg_Backend * | msg_backend (ACE_Log_Msg_Backend *b) |
static ACE_Log_Msg_Backend * | msg_backend (void) |
static void | init_hook (ACE_OS_Log_Msg_Attributes &attributes) |
static void | inherit_hook (ACE_OS_Thread_Descriptor *thr_desc, ACE_OS_Log_Msg_Attributes &attributes) |
Public Attributes | |
ACE_ALLOC_HOOK_DECLARE | |
Declare the dynamic allocation hooks. | |
bool | is_set_ |
const char * | file_ |
int | line_ |
int | op_status_ |
Private Types | |
typedef ACE_Atomic_Op < ACE_SYNCH_MUTEX, unsigned long > | Atomic_ULong |
Private Member Functions | |
void | cleanup_ostream () |
ACE_Log_Msg & | operator= (const ACE_Log_Msg &) |
ACE_Log_Msg (const ACE_Log_Msg &) |
Static Private Member Functions | |
static void | close (void) |
For cleanup, at program termination. | |
static void | sync_hook (const ACE_TCHAR *prg_name) |
Decouple the OS layer from the ACE_Log_Msg layer. | |
static ACE_OS_Thread_Descriptor * | thr_desc_hook (void) |
Return the TSS singleton thread descriptor. |
Private Attributes | |
int | status_ |
Status of operation (-1 means failure, >= 0 means success). | |
int | errnum_ |
Type of error that occurred (see <sys/errno.h>). | |
int | linenum_ |
Line number where the error occurred. | |
char | file_ [MAXPATHLEN+1] |
File where the error occurred. | |
ACE_TCHAR * | msg_ |
bool | restart_ |
ACE_OSTREAM_TYPE * | ostream_ |
The ostream where logging messages can be written. | |
Atomic_ULong * | ostream_refcount_ |
ACE_Log_Msg_Callback * | msg_callback_ |
The callback object. | |
int | trace_depth_ |
Depth of the nesting for printing traces. | |
bool | trace_active_ |
Are we already within an ACE_Trace constructor call? | |
bool | tracing_enabled_ |
Are we allowing tracing in this thread? | |
ACE_Thread_Descriptor * | thr_desc_ |
u_long | priority_mask_ |
int | timestamp_ |
Always timestamp? | |
struct { | |
bool is_set_ | |
const char * file_ | |
int line_ | |
int op_status_ | |
int errnum_ | |
} | conditional_values_ |
Static Private Attributes | |
static u_long | process_priority_mask_ |
static const ACE_TCHAR * | program_name_ = 0 |
Records the program name. | |
static const ACE_TCHAR * | local_host_ = 0 |
Name of the local host (used when printing messages). | |
static pid_t | pid_ = -2 |
Process id of the current process. | |
static u_long | flags_ = ACE_Log_Msg::STDERR |
Default is to use stderr. | |
static ptrdiff_t | msg_off_ = 0 |
Offset of msg_[]. | |
static int | instance_count_ = 0 |
static u_long | default_priority_mask_ = 0 |
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 priority_mask_
object attribute is thread- specific and specifies the priority levels logged by the thread. The 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 priority_mask_
and all levels are enabled for 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.
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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.
anonymous enum |
ACE_Log_Msg::ACE_Log_Msg | ( | void | ) |
Initialize logger.
ACE_Log_Msg::~ACE_Log_Msg | ( | void | ) |
cleanup logger.
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int ACE_Log_Msg::acquire | ( | void | ) |
Acquire the internal lock.
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For cleanup, at program termination.
void ACE_Log_Msg::clr_flags | ( | u_long | f | ) |
Disable the bits in the logger's options flags.
void ACE_Log_Msg::conditional_set | ( | const char * | file, |
int | line, | ||
int | op_status, | ||
int | errnum | ||
) |
These values are only actually set if the requested priority is enabled.
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Nesting depth decrement.
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Clears the flag from the default priority mask used to initialize ACE_Log_Msg instances.
void ACE_Log_Msg::dump | ( | void | ) | const |
Dump the state of an object.
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Sets the flag in the default priority mask used to initialize ACE_Log_Msg instances.
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Set the value of the errnum (by convention this corresponds to errno).
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Get the value of the errnum (by convention this corresponds to errno).
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Returns non-null if an ACE_Log_Msg exists for the calling thread.
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Set the file name where an error occurred.
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Get the file name where an error occurred.
u_long ACE_Log_Msg::flags | ( | void | ) |
Return the bits in the logger's options flags.
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Optimize reading of the pid (avoids a system call if the value is cached...).
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Nesting depth increment.
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Inherit hook, the attributes field is a ACE_OS_Log_Msg_Attributes object, invoke the inherit_log_msg() method on it, then destroy it and set the attribute argument to 0.
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Init hook, create a Log_Msg_Attribute object, initialize its attributes from the TSS Log_Msg and save the object in the attributes argument
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Returns a pointer to the Singleton.
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Returns last error.
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Set the line number where an error occurred.
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Get the line number where an error occurred.
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Get the name of the local host.
void ACE_Log_Msg::local_host | ( | const ACE_TCHAR * | s | ) |
Set the name of the local host.
ssize_t ACE_Log_Msg::log | ( | ACE_Log_Priority | log_priority, |
const ACE_TCHAR * | format_str, | ||
... | |||
) |
Format a message to the thread-safe ACE logging mechanism. Valid options (prefixed by '', as in printf format strings) include:
Valid Options (prefixed by '', as in printf format strings) include: 'A': print an ACE_timer_t value 'a': exit the program at this point (var-argument is the exit status!) 'b': print a ssize_t value 'B': print a size_t value 'c': print a character 'C': print a character string 'i', 'd': print a decimal number 'I', indent according to nesting depth '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': format the current process id 'p': format 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': format a character string 'T': print timestamp in hour:minute:sec:usec format. 'D': print timestamp in month/day/year hour:minute:sec:usec format. 't': print thread id (1 if single-threaded) 'u': print as unsigned int 'x': print as a hex number 'X': print as a hex number 'w': print a wide character 'W': print out a wide character string. 'z': print an ACE_OS::WChar character 'Z': print an ACE_OS::WChar character string ':': print a time_t value as an integral number '': format a single percent sign, ''
ssize_t ACE_Log_Msg::log | ( | ACE_Log_Priority | log_priority, |
const ACE_ANTI_TCHAR * | format_str, | ||
... | |||
) |
Since this is the ANTI_TCHAR version, we need to convert the format string over.
ssize_t ACE_Log_Msg::log | ( | const ACE_TCHAR * | format, |
ACE_Log_Priority | priority, | ||
va_list | argp | ||
) |
An alternative logging mechanism that makes it possible to integrate variable argument lists from other logging mechanisms into the ACE mechanism.
ssize_t ACE_Log_Msg::log | ( | ACE_Log_Record & | log_record, |
int | suppress_stderr = 0 |
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Log a custom built log record to the currently enabled logging sinks.
int ACE_Log_Msg::log_hexdump | ( | ACE_Log_Priority | log_priority, |
const char * | buffer, | ||
size_t | size, | ||
const ACE_TCHAR * | text = 0 |
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) |
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.
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Return true if the requested priority is enabled.
int ACE_Log_Msg::log_priority_enabled | ( | ACE_Log_Priority | log_priority, |
const char * | , | ||
... | |||
) |
Return true if the requested priority is enabled.
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Set the message that describes what type of error occurred.
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Get the message that describes what type of error occurred.
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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.
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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.
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Update the ostream without overwriting the delete_ostream_ flag.
void ACE_Log_Msg::msg_ostream | ( | ACE_OSTREAM_TYPE * | m, |
bool | delete_ostream | ||
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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)
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Get the ostream that is used to print error messages.
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Set the result of the operation status (by convention, -1 means error).
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Get the result of the operation status (by convention, -1 means error).
int ACE_Log_Msg::open | ( | const ACE_TCHAR * | prog_name, |
u_long | options_flags = ACE_Log_Msg::STDERR , |
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const ACE_TCHAR * | logger_key = 0 |
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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.
prog_name | The name of the calling program. |
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). |
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 flags argument. If the SYSLOG bit is set in flags, 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 logger_key is 0, prog_name is used. |
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Get the current ACE_Log_Priority mask.
Set the ACE_Log_Priority mask, returns original mask.
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Returns the current program name used for logging.
int ACE_Log_Msg::release | ( | void | ) |
Release the internal lock.
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Set the field that indicates whether interrupted calls should be restarted.
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Get the field that indicates whether interrupted calls should be restarted.
void ACE_Log_Msg::set | ( | const char * | file, |
int | line, | ||
int | op_status = -1 , |
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int | errnum = 0 , |
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bool | restart = true , |
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ACE_OSTREAM_TYPE * | os = 0 , |
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ACE_Log_Msg_Callback * | c = 0 |
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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 ACE_Log_Msg::set_flags | ( | u_long | f | ) |
Enable the bits in the logger's options flags.
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Start tracing status on a per-thread basis...
Enable the tracing facility on a per-thread basis.
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Stop tracing status on a per-thread basis...
Disable the tracing facility on a per-thread basis.
void ACE_Log_Msg::sync | ( | const ACE_TCHAR * | program_name | ) |
Call after doing a fork()
to resynchronize the process id and program_name_
variables.
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Decouple the OS layer from the ACE_Log_Msg layer.
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Get the TSS thread descriptor.
void ACE_Log_Msg::thr_desc | ( | ACE_Thread_Descriptor * | td | ) |
Set the TSS thread descriptor. This method will call td->acquire_release to block execution until this call return.
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Return the TSS singleton thread descriptor.
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Get trace active status.
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Set trace active status.
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Get trace depth.
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Set trace depth.
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Query tracing status on a per-thread basis...
ACE_Log_Msg::ACE_ALLOC_HOOK_DECLARE |
Declare the dynamic allocation hooks.
struct { ... } ACE_Log_Msg::conditional_values_ |
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.
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Priority mask to use for each new instance
Default per-thread priority mask By default, no priorities are enabled.
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Type of error that occurred (see <sys/errno.h>).
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File where the error occurred.
const char* ACE_Log_Msg::file_ |
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Default is to use stderr.
Options flags used to hold the logger flag options, e.g., STDERR, LOGGER, OSTREAM, MSG_CALLBACK, etc.
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Number of existing ACE_Log_Msg instances; when 0, delete program/host names
Instance count for Log_Msg - used to know when dynamically allocated storage (program name and host name) can be safely deleted.
bool ACE_Log_Msg::is_set_ |
int ACE_Log_Msg::line_ |
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Line number where the error occurred.
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Name of the local host (used when printing messages).
Name of the local host.
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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().
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The callback object.
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Offset of msg_[].
Current offset of msg_[].
int ACE_Log_Msg::op_status_ |
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The ostream where logging messages can be written.
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Process id of the current process.
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Keeps track of all the per-thread ACE_Log_Priority values that are currently enabled. Default is for all logging priorities to be disabled.
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Records the program name.
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Indicates whether we should restart system calls that are interrupted.
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Status of operation (-1 means failure, >= 0 means success).
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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.
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Always timestamp?
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Are we already within an ACE_Trace constructor call?
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Depth of the nesting for printing traces.
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Are we allowing tracing in this thread?