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/usr/include/diet/sys/syslog.h is in dietlibc-dev 0.33~cvs20120325-6+deb8u1.

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#ifndef _SYS_SYSLOG_H
#define _SYS_SYSLOG_H 1

#include <sys/cdefs.h>
#include <stdarg.h>

__BEGIN_DECLS

#define _PATH_LOG	"/dev/log"

/*
 * priorities/facilities are encoded into a single 32-bit quantity, where the
 * bottom 3 bits are the priority (0-7) and the top 28 bits are the facility
 * (0-big number).  Both the priorities and the facilities map roughly
 * one-to-one to strings in the syslogd(8) source code.  This mapping is
 * included in this file.
 *
 * priorities (these are ordered)
 */
#define LOG_EMERG	0	/* system is unusable */
#define LOG_ALERT	1	/* action must be taken immediately */
#define LOG_CRIT	2	/* critical conditions */
#define LOG_ERR		3	/* error conditions */
#define LOG_WARNING	4	/* warning conditions */
#define LOG_NOTICE	5	/* normal but significant condition */
#define LOG_INFO	6	/* informational */
#define LOG_DEBUG	7	/* debug-level messages */

#define LOG_PRIMASK	0x07	/* mask to extract priority part (internal) */
				/* extract priority */
#define LOG_PRI(p)	((p) & LOG_PRIMASK)
#define LOG_MAKEPRI(fac, pri)	(((fac) << 3) | (pri))

/* facility codes */
#define LOG_KERN	(0<<3)	/* kernel messages */
#define LOG_USER	(1<<3)	/* random user-level messages */
#define LOG_MAIL	(2<<3)	/* mail system */
#define LOG_DAEMON	(3<<3)	/* system daemons */
#define LOG_AUTH	(4<<3)	/* security/authorization messages */
#define LOG_SYSLOG	(5<<3)	/* messages generated internally by syslogd */
#define LOG_LPR		(6<<3)	/* line printer subsystem */
#define LOG_NEWS	(7<<3)	/* network news subsystem */
#define LOG_UUCP	(8<<3)	/* UUCP subsystem */
#define LOG_CRON	(9<<3)	/* clock daemon */
#define LOG_AUTHPRIV	(10<<3)	/* security/authorization messages (private) */
#define LOG_FTP		(11<<3)	/* ftp daemon */

	/* other codes through 15 reserved for system use */
#define LOG_LOCAL0	(16<<3)	/* reserved for local use */
#define LOG_LOCAL1	(17<<3)	/* reserved for local use */
#define LOG_LOCAL2	(18<<3)	/* reserved for local use */
#define LOG_LOCAL3	(19<<3)	/* reserved for local use */
#define LOG_LOCAL4	(20<<3)	/* reserved for local use */
#define LOG_LOCAL5	(21<<3)	/* reserved for local use */
#define LOG_LOCAL6	(22<<3)	/* reserved for local use */
#define LOG_LOCAL7	(23<<3)	/* reserved for local use */

#define LOG_NFACILITIES	24	/* current number of facilities */
#define LOG_FACMASK	0x03f8	/* mask to extract facility part */
				/* facility of pri */
#define LOG_FAC(p)	(((p) & LOG_FACMASK) >> 3)

/*
 * arguments to setlogmask.
 */
#define LOG_MASK(pri)	(1 << (pri))		/* mask for one priority */
#define LOG_UPTO(pri)	((1 << ((pri)+1)) - 1)	/* all priorities through pri */

/*
 * Option flags for openlog.
 *
 * LOG_ODELAY no longer does anything.
 * LOG_NDELAY is the inverse of what it used to be.
 */
#define LOG_PID		0x01	/* log the pid with each message */
#define LOG_CONS	0x02	/* log on the console if errors in sending */
#define LOG_ODELAY	0x04	/* delay open until first syslog() (default) */
#define LOG_NDELAY	0x08	/* don't delay open */
#define LOG_NOWAIT	0x10	/* don't wait for console forks: DEPRECATED */
#define LOG_PERROR	0x20	/* log to stderr as well */

/* Open connection to system logger.  */
/* against the glibc-routine ident has not to be const ! */
/* instead ident is limited to 80 characters ! */
void openlog (const char *ident, int option, int  facility);

void closelog (void) __THROW;

int setlogmask (int mask) __THROW;

void syslog (int priority, const char *format, ...) __THROW;

void vsyslog (int priority, const char *format, va_list arg_ptr) __THROW;

/* yuck yuck yuck, only needed for syslogd. */
typedef struct _code {
  const char *const c_name;
  int c_val;
} CODE;

extern CODE prioritynames[];
extern CODE facilitynames[];

__END_DECLS

#endif