XSI_SYSTEM_LOGGING

XSI System Logging option group. More...

syslog() priority codes
void	closelog (void)
	Close the connection to the system logger.
void	openlog (const char *ident, int logopt, int facility)
	Open a connection to the system logger.
int	setlogmask (int maskpri)
	Set the log priority mask.
void	syslog (int priority, const char *message,...)
	Write a message to the system logger.
void	vsyslog (int priority, const char *format, va_list ap)
	Write a message to the system logger (va_list form).

openlog() option flags
#define	LOG_PID   1
	Include the process ID in each log message.
#define	LOG_CONS   2
	Log to the system console if the logger is unavailable.
#define	LOG_NDELAY   4
	Open the connection to the logger immediately.
#define	LOG_ODELAY   8
	Delay the connection until the first message is sent.
#define	LOG_NOWAIT   16
	Do not wait for child processes created by logging.
#define	LOG_PERROR   32
	Also write messages to stderr.

Detailed Description

XSI System Logging option group.

Macro Definition Documentation

LOG_CONS

#define LOG_CONS   2

Log to the system console if the logger is unavailable.

Definition at line 25 of file syslog.h.

LOG_NDELAY

#define LOG_NDELAY   4

Open the connection to the logger immediately.

Definition at line 27 of file syslog.h.

LOG_NOWAIT

#define LOG_NOWAIT   16

Do not wait for child processes created by logging.

Definition at line 31 of file syslog.h.

LOG_ODELAY

#define LOG_ODELAY   8

Delay the connection until the first message is sent.

Definition at line 29 of file syslog.h.

LOG_PERROR

#define LOG_PERROR   32

Also write messages to stderr.

Definition at line 33 of file syslog.h.

LOG_PID

#define LOG_PID   1

Include the process ID in each log message.

Definition at line 23 of file syslog.h.

Function Documentation

closelog()

void closelog

(

void

)

Close the connection to the system logger.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/closelog.html

openlog()

void openlog	(	const char *	ident,
		int	logopt,
		int	facility
	)

Open a connection to the system logger.

Parameters

ident	String prepended to each log message; typically the program name.
logopt	OR of LOG_* option flags (LOG_PID, LOG_CONS, etc.).
facility	Facility code (LOG_USER, LOG_DAEMON, etc.).

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/openlog.html

setlogmask()

int setlogmask

(

int

maskpri

)

Set the log priority mask.

Parameters

maskpri

New priority mask (generated with LOG_MASK()).

Returns

The previous log priority mask.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/setlogmask.html

syslog()

void syslog	(	int	priority,
		const char *	message,
			...
	)

Write a message to the system logger.

Parameters

priority	Priority code (LOG_EMERG .. LOG_DEBUG).
message	printf()-style format string.
...	Format arguments.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/syslog.html

vsyslog()

void vsyslog	(	int	priority,
		const char *	format,
		va_list	ap
	)

Write a message to the system logger (va_list form).

Parameters

priority	Priority code (LOG_EMERG .. LOG_DEBUG).
format	printf()-style format string.
ap	Argument list.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/vsyslog.html