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      1 /*	$NetBSD: eprintf.c,v 1.2 2009/03/14 15:36:04 dsl Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995 Waldi Ravens.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *        This product includes software developed by Waldi Ravens.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #include <fcntl.h>
     34 #include <errno.h>
     35 #include <stdio.h>
     36 #include <stdarg.h>
     37 #include <unistd.h>
     38 #include "libtos.h"
     39 
     40 static int	output_redirected = 0;
     41 
     42 void
     43 redirect_output(char *fn)
     44 {
     45 	int	fd;
     46 
     47 	fd = creat(fn, 0666);
     48 	if (fd < 0 || dup2(fd, STDOUT_FILENO) < 0)
     49 		fatal(errno, "%s", fn);
     50 	output_redirected = 1;
     51 }
     52 
     53 /*
     54  * Print output to stderr. When output is redirected,
     55  * also write it to stdout.
     56  */
     57 int
     58 eprintf(char *frm)
     59 {
     60 	va_list	args;
     61 	int	rv;
     62 
     63 	va_start(args, frm);
     64 	rv = veprintf(frm, args);
     65 	va_end(args);
     66 	return(rv);
     67 }
     68 
     69 int
     70 veprintf(char *frm, va_list args)
     71 {
     72 	int	rv;
     73 
     74 	rv = vfprintf(stderr, frm, args);
     75 	if (output_redirected)
     76 		vfprintf(stdout, frm, args);
     77 	return(rv);
     78 }
     79