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 #include <sys/types.h>
28 #include <errno.h>
29 #include <fcntl.h>
30 #include <limits.h>
31 #include <signal.h>
32 #include <stdio.h>
33 #include <stdio_ext.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <unistd.h>
37
38 #define _FILE_FD_MAX 255
39
40 /*
41 * This 32-bit only preloadable library enables extended fd FILE's.
42 */
43
44 #pragma init(init_STDIO_bad_fd)
45
46 void
init_STDIO_bad_fd(void)47 init_STDIO_bad_fd(void)
48 {
49 int action = -1; /* default signal */
50 int closed_fd = -1; /* default fd */
51 char *ptr;
52 int signal;
53 int retval;
54
55 /*
56 * user specified badfd
57 */
58 if ((ptr = getenv("_STDIO_BADFD")) != NULL) {
59 closed_fd = atoi(ptr);
60 if (closed_fd < 3 || closed_fd > _FILE_FD_MAX) {
61 (void) fprintf(stderr, "File descriptor must be"
62 " in the range 3-%d inclusive.\n", _FILE_FD_MAX);
63 exit(1);
64 }
65 }
66
67 /*
68 * user specified action
69 */
70 if ((ptr = getenv("_STDIO_BADFD_SIGNAL")) != NULL) {
71 /* accept numbers or symbolic names */
72 if (strncmp(ptr, "SIG", 3) == 0) /* begins with "SIG"? */
73 ptr = ptr + 3;
74 retval = str2sig(ptr, &signal);
75 if (retval == -1) {
76 (void) fprintf(stderr,
77 "Invalid signal name or number.\n");
78 exit(1);
79 }
80 action = signal;
81 }
82
83 if ((closed_fd = enable_extended_FILE_stdio(closed_fd, action)) == -1) {
84 perror("enable_extended_FILE_stdio(3C)");
85 exit(1);
86 }
87 }
88