# cat syslog.c
#include <stdio.h>
#include <unistd.h>
#include <syslog.h>

int main(void) {

 openlog("slog", LOG_PID|LOG_CONS, LOG_USER);
 syslog(LOG_INFO, "A different kind of Hello world ... ");
 closelog();

 return 0;
}
			
			

[root@dev1 test]# gcc syslog.c
[root@dev1 test]# ls
a.out  syslog.c
[root@dev1 test]# ./a.out

[root@dev1 test]# tail /var/log/messages
Jan 11 23:52:27 dev1 slog[5056]: A different kind of Hello world ...
			

http://www.libssh2.org/