#include	"unp.h"#include	<stdarg.h>		/* ANSI C header file */#include	<syslog.h>		/* for syslog() */int		daemon_proc;		/* set nonzero by daemon_init() */static void	err_doit(int, int, const char *, va_list);/* Nonfatal error related to a system call. * Print a message and return. */voiderr_ret(const char *fmt, ...){	va_list		ap;	va_start(ap, fmt);	err_doit(1, LOG_INFO, fmt, ap);	va_end(ap);	return;}/* Fatal error related to a system call. * Print a message and terminate. */voiderr_sys(const char *fmt, ...){	va_list		ap;	va_start(ap, fmt);	err_doit(1, LOG_ERR, fmt, ap);	va_end(ap);	exit(1);}/* Fatal error related to a system call. * Print a message, dump core, and terminate. */voiderr_dump(const char *fmt, ...){	va_list		ap;	va_start(ap, fmt);	err_doit(1, LOG_ERR, fmt, ap);	va_end(ap);	abort();		/* dump core and terminate */	exit(1);		/* shouldn't get here */}/* Nonfatal error unrelated to a system call. * Print a message and return. */voiderr_msg(const char *fmt, ...){	va_list		ap;	va_start(ap, fmt);	err_doit(0, LOG_INFO, fmt, ap);	va_end(ap);	return;}/* Fatal error unrelated to a system call. * Print a message and terminate. */voiderr_quit(const char *fmt, ...){	va_list		ap;	va_start(ap, fmt);	err_doit(0, LOG_ERR, fmt, ap);	va_end(ap);	exit(1);}/* Print a message and return to caller. * Caller specifies "errnoflag" and "level". */static voiderr_doit(int errnoflag, int level, const char *fmt, va_list ap){	int		errno_save, n;	char	buf[MAXLINE];	errno_save = errno;		/* value caller might want printed */#ifdef	HAVE_VSNPRINTF	vsnprintf(buf, sizeof(buf), fmt, ap);	/* this is safe */#else	vsprintf(buf, fmt, ap);					/* this is not safe */#endif	n = strlen(buf);	if (errnoflag)		snprintf(buf+n, sizeof(buf)-n, ": %s", strerror(errno_save));	strcat(buf, "\n");	if (daemon_proc) {		syslog(level, buf);	} else {		fflush(stdout);		/* in case stdout and stderr are the same */		fputs(buf, stderr);		fflush(stderr);	}	return;}