cuserid
logname = cuserid((char *) NULL);
cuserid((char *) 0), asctime(local));
cuserid((char *) 0), asctime(local));
from = cuserid(user_name);
myname = cuserid(user_name);
if ((username = cuserid(NULL)) == NULL)
authname = cuserid(NULL);
(void) cuserid(myname);
extern char *cuserid(char *);
extern char *cuserid(char *);
(void) cuserid(myname);
extern char *cuserid(char *);