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 2010 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
29
30 #include "lint.h"
31 #include <sys/mkdev.h>
32 #include <limits.h>
33 #include <stdarg.h>
34 #include <unistd.h>
35 #include <strings.h>
36 #include <errno.h>
37 #include <sys/stat.h>
38 #include <sys/fcntl.h>
39 #include <sys/stropts.h>
40 #include <sys/stream.h>
41 #include <sys/ptms.h>
42 #include <sys/syscall.h>
43 #include "libc.h"
44
45 static int xpg4_fixup(int fd);
46 static void push_module(int fd);
47 static int isptsfd(int fd);
48 static void itoa(int i, char *ptr);
49
50 int
51 __openat(int dfd, const char *path, int oflag, mode_t mode)
52 {
53 int fd = syscall(SYS_openat, dfd, path, oflag, mode);
54 return (xpg4_fixup(fd));
55 }
56
57 int
58 __open(const char *path, int oflag, mode_t mode)
59 {
60 #if defined(_RETAIN_OLD_SYSCALLS)
61 int fd = syscall(SYS_open, path, oflag, mode);
62 return (xpg4_fixup(fd));
63 #else
64 return (__openat(AT_FDCWD, path, oflag, mode));
65 #endif
66 }
67
68 #if !defined(_LP64)
69
70 int
71 __openat64(int dfd, const char *path, int oflag, mode_t mode)
72 {
73 int fd = syscall(SYS_openat64, dfd, path, oflag, mode);
74 return (xpg4_fixup(fd));
75 }
76
77 int
78 __open64(const char *path, int oflag, mode_t mode)
79 {
80 #if defined(_RETAIN_OLD_SYSCALLS)
81 int fd = syscall(SYS_open64, path, oflag, mode);
82 return (xpg4_fixup(fd));
83 #else
84 return (__openat64(AT_FDCWD, path, oflag, mode));
85 #endif
86 }
87
88 #endif /* !_LP64 */
89
90 /*
91 * XPG4v2 requires that open of a slave pseudo terminal device
92 * provides the process with an interface that is identical to
93 * the terminal interface. For a more detailed discussion,
94 * see bugid 4025044.
95 */
96 static int
97 xpg4_fixup(int fd)
98 {
99 if (libc__xpg4 != 0 && fd >= 0 && isptsfd(fd))
100 push_module(fd);
101 return (fd);
102 }
103
104 /*
105 * Check if the file matches an entry in the /dev/pts directory.
106 * Be careful to preserve errno.
107 */
108 static int
109 isptsfd(int fd)
110 {
111 char buf[TTYNAME_MAX];
112 char *str1 = buf;
113 const char *str2 = "/dev/pts/";
114 struct stat64 fsb, stb;
115 int oerrno = errno;
116 int rval = 0;
117
118 if (fstat64(fd, &fsb) == 0 && S_ISCHR(fsb.st_mode)) {
119 /*
120 * Do this without strcpy() or strlen(),
121 * to avoid invoking the dynamic linker.
122 */
123 while (*str2 != '\0')
124 *str1++ = *str2++;
125 /*
126 * Inline version of minor(dev), to avoid the dynamic linker.
127 */
128 itoa(fsb.st_rdev & MAXMIN, str1);
129 if (stat64(buf, &stb) == 0)
130 rval = (stb.st_rdev == fsb.st_rdev);
131 }
132 errno = oerrno;
133 return (rval);
134 }
135
136 /*
137 * Converts a number to a string (null terminated).
138 */
139 static void
140 itoa(int i, char *ptr)
141 {
142 int dig = 0;
143 int tempi;
144
145 tempi = i;
146 do {
147 dig++;
148 tempi /= 10;
149 } while (tempi);
150
151 ptr += dig;
152 *ptr = '\0';
153 while (--dig >= 0) {
154 *(--ptr) = i % 10 + '0';
155 i /= 10;
156 }
157 }
158
159 /*
160 * Push modules to provide tty semantics
161 */
162 static void
163 push_module(int fd)
164 {
165 struct strioctl istr;
166 int oerrno = errno;
167
168 istr.ic_cmd = PTSSTTY;
169 istr.ic_len = 0;
170 istr.ic_timout = 0;
171 istr.ic_dp = NULL;
172 if (ioctl(fd, I_STR, &istr) != -1) {
173 (void) ioctl(fd, __I_PUSH_NOCTTY, "ptem");
174 (void) ioctl(fd, __I_PUSH_NOCTTY, "ldterm");
175 (void) ioctl(fd, __I_PUSH_NOCTTY, "ttcompat");
176 istr.ic_cmd = PTSSTTY;
177 istr.ic_len = 0;
178 istr.ic_timout = 0;
179 istr.ic_dp = NULL;
180 (void) ioctl(fd, I_STR, &istr);
181 }
182 errno = oerrno;
183 }