Tribblix: manual page: vsyslog.3c

VSYSLOG(3C) Standard C Library Functions VSYSLOG(3C)

NAME

vsyslog - log message with a stdarg argument list

SYNOPSIS

#include <syslog.h>
#include <stdarg.h>

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

DESCRIPTION

The vsyslog() function is identical to syslog(3C), except that it is
called with an argument list as defined by <stdarg.h> rather than
with a variable number of arguments.

EXAMPLES

Example 1: Use vsyslog() to write an error routine.

The following example demonstrates the use of vsyslog() in writing an
error routine.

#include <syslog.h>
#include <stdarg.h>

/*
* error should be called like:
* error(pri, function_name, format, arg1, arg2...);
*/

void
error(int pri, char *function_name, char *format, ...)
{
va_list args;

va_start(args, format);
/* log name of function causing error */
(void) syslog(pri, "ERROR in %s.", function_name);
/* log remainder of message */
(void) vsyslog(pri, format, args);
va_end(args);
(void) abort( );
}

main()
{
error(LOG_ERR, "main", "process %d is dying", getpid());
}