This won't work as you do not involve the variable number of parameters possibly passed into your function.
On how to do this you might take a look a the following example using vsyslog()
:
#include <syslog.h>
#include <stdarg.h>
...
int _logf(int priority, const char * fmt, ...)
{
if (log.priority >= priority)
{
va_list ap;
va_start(ap, fmt);
vsyslog(priority, fmt, ap);
va_end(ap);
}
}
Then call it for example like so:
_logf(LOG_INFO, "LOG %s:%d (%s) - %s", __FILE__, __LINE__, __func__, "Just some info.");
Update:
To additionally log to stderr
you might like to look ath function vfprintf()
.