1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29#include <sys/types.h>
30#include <errno.h>
31#include <fcntl.h>
32#include <limits.h>
33#include <signal.h>
34#include <stdio.h>
35#include <stdio_ext.h>
36#include <stdlib.h>
37#include <string.h>
38#include <unistd.h>
39
40#define	_FILE_FD_MAX 255
41
42/*
43 * This 32-bit only preloadable library enables extended fd FILE's.
44 */
45
46#pragma	init(init_STDIO_bad_fd)
47
48void
49init_STDIO_bad_fd(void)
50{
51	int action = -1;	/* default signal */
52	int closed_fd = -1;	/* default fd */
53	char *ptr;
54	int signal;
55	int retval;
56
57	/*
58	 * user specified badfd
59	 */
60	if ((ptr = getenv("_STDIO_BADFD")) != NULL) {
61		closed_fd = atoi(ptr);
62		if (closed_fd < 3 || closed_fd > _FILE_FD_MAX) {
63			(void) fprintf(stderr, "File descriptor must be"
64			    " in the range 3-%d inclusive.\n", _FILE_FD_MAX);
65			exit(1);
66		}
67	}
68
69	/*
70	 * user specified action
71	 */
72	if ((ptr = getenv("_STDIO_BADFD_SIGNAL")) != NULL) {
73		/* accept numbers or symbolic names */
74		if (strncmp(ptr, "SIG", 3) == 0)	/* begins with "SIG"? */
75			ptr = ptr + 3;
76		retval = str2sig(ptr, &signal);
77		if (retval == -1) {
78			(void) fprintf(stderr,
79			    "Invalid signal name or number.\n");
80			exit(1);
81		}
82		action = signal;
83	}
84
85	if ((closed_fd = enable_extended_FILE_stdio(closed_fd, action)) == -1) {
86		perror("enable_extended_FILE_stdio(3C)");
87		exit(1);
88	}
89}
90