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 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #pragma ident "%Z%%M% %I% %E% SMI"
27
28 #include <string.h>
29 #include <stddef.h>
30 #include <errno.h>
31 #include <unistd.h>
32 #include <assert.h>
33 #include <sys/types.h>
34 #include <sys/systm.h>
35 #include <sys/dirent.h>
36 #include <sys/lx_misc.h>
37 #include <sys/lx_debug.h>
38
39 #define LX_NAMEMAX 256
40
41 struct lx_dirent {
42 long d_ino; /* not l_ino_t */
43 long d_off;
44 ushort_t d_reclen;
45 char d_name[LX_NAMEMAX];
46 };
47
48 struct lx_dirent64 {
49 uint64_t d_ino;
50 int64_t d_off;
51 ushort_t d_reclen;
52 uchar_t d_type;
53 char d_name[LX_NAMEMAX];
54 };
55
56 #define LX_RECLEN(namelen) \
57 ((offsetof(struct lx_dirent64, d_name) + 1 + (namelen) + 7) & ~7)
58
59 /*
60 * Read in one dirent structure from fd into dirp.
61 * p3 (count) is ignored.
62 */
63 /*ARGSUSED*/
64 int
65 lx_readdir(uintptr_t p1, uintptr_t p2, uintptr_t p3)
66 {
67 int fd = (int)p1;
68 struct lx_dirent *dirp = (struct lx_dirent *)p2;
69 uint_t count = sizeof (struct lx_dirent);
70 int rc = 0;
71 struct lx_dirent _ld;
72 struct dirent *sd = (struct dirent *)&_ld;
73
74 /*
75 * The return value from getdents is not applicable, as
76 * it might have squeezed more than one dirent in the buffer
77 * we provided.
78 *
79 * getdents() will deal with the case of dirp == NULL
80 */
81 if ((rc = getdents(fd, sd, count)) < 0)
82 return (-errno);
83
84 /*
85 * Set rc 1 (pass), or 0 (end of directory).
86 */
87 rc = (sd->d_reclen == 0) ? 0 : 1;
88
89 if (uucopy(sd, dirp, count) != 0)
90 return (-errno);
91
92 return (rc);
93 }
94
95 /*
96 * Read in dirent64 structures from p1 (fd) into p2 (buffer).
97 * p3 (count) is the size of the memory area.
98 */
99 int
100 lx_getdents64(uintptr_t p1, uintptr_t p2, uintptr_t p3)
101 {
102 int fd = (uint_t)p1;
103 void *buf = (void *)p2;
104 void *sbuf, *lbuf;
105 int lbufsz = (uint_t)p3;
106 int sbufsz;
107 int namelen;
108 struct dirent *sd;
109 struct lx_dirent64 *ld;
110 int bytes, rc;
111
112 if (lbufsz < sizeof (struct lx_dirent64))
113 return (-EINVAL);
114
115 /*
116 * The Linux dirent64 is bigger than the Solaris dirent64. To
117 * avoid inadvertently consuming more of the directory than we can
118 * pass back to the Linux app, we hand the kernel a smaller buffer
119 * than the app handed us.
120 */
121 sbufsz = (lbufsz / 32) * 24;
122
123 sbuf = SAFE_ALLOCA(sbufsz);
124 lbuf = SAFE_ALLOCA(lbufsz);
125 if (sbuf == NULL || lbuf == NULL)
126 return (-ENOMEM);
127
128 if ((bytes = getdents(fd, sbuf, sbufsz)) < 0)
129 return (-errno);
130
131 /* munge the Solaris buffer to a linux buffer. */
132 sd = (struct dirent *)sbuf;
133 ld = (struct lx_dirent64 *)lbuf;
134 rc = 0;
135 while (bytes > 0) {
136 namelen = strlen(sd->d_name);
137 if (namelen >= LX_NAMEMAX)
138 namelen = LX_NAMEMAX - 1;
139 ld->d_ino = (uint64_t)sd->d_ino;
140 ld->d_off = (int64_t)sd->d_off;
141 ld->d_type = 0;
142
143 (void) strncpy(ld->d_name, sd->d_name, namelen);
144 ld->d_name[namelen] = 0;
145 ld->d_reclen = (ushort_t)LX_RECLEN(namelen);
146
147 bytes -= (int)sd->d_reclen;
148 rc += (int)ld->d_reclen;
149
150 sd = (struct dirent *)(void *)((caddr_t)sd + sd->d_reclen);
151 ld = (struct lx_dirent64 *)(void *)((caddr_t)ld + ld->d_reclen);
152 }
153
154 /* now copy the lbuf to the userland buffer */
155 assert(rc <= lbufsz);
156 if (uucopy(lbuf, buf, rc) != 0)
157 return (-EFAULT);
158
159 return (rc);
160 }