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d711a486 | 1 | /** @file\r |
2 | Open a directory.\r | |
3 | \r | |
4 | Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | Copyright (c) 1983, 1993\r | |
14 | The Regents of the University of California. All rights reserved.\r | |
15 | \r | |
16 | Redistribution and use in source and binary forms, with or without\r | |
17 | modification, are permitted provided that the following conditions\r | |
18 | are met:\r | |
19 | 1. Redistributions of source code must retain the above copyright\r | |
20 | notice, this list of conditions and the following disclaimer.\r | |
21 | 2. Redistributions in binary form must reproduce the above copyright\r | |
22 | notice, this list of conditions and the following disclaimer in the\r | |
23 | documentation and/or other materials provided with the distribution.\r | |
24 | 3. Neither the name of the University nor the names of its contributors\r | |
25 | may be used to endorse or promote products derived from this software\r | |
26 | without specific prior written permission.\r | |
27 | \r | |
28 | THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r | |
29 | ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r | |
30 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r | |
31 | ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r | |
32 | FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r | |
33 | DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r | |
34 | OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r | |
35 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r | |
36 | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r | |
37 | OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r | |
38 | SUCH DAMAGE.\r | |
39 | \r | |
40 | NetBSD: opendir.c,v 1.33 2008/01/10 09:49:04 elad Exp\r | |
41 | opendir.c 8.7 (Berkeley) 12/10/94\r | |
42 | **/\r | |
43 | #include <sys/cdefs.h>\r | |
44 | \r | |
45 | #include <namespace.h>\r | |
46 | #include <reentrant.h>\r | |
47 | #include <extern.h>\r | |
48 | #include <sys/param.h>\r | |
49 | //#include <sys/mount.h>\r | |
50 | #include <sys/stat.h>\r | |
51 | \r | |
52 | #include <assert.h>\r | |
53 | #include <dirent.h>\r | |
54 | #include <errno.h>\r | |
55 | #include <fcntl.h>\r | |
56 | #include <stdlib.h>\r | |
57 | #include <string.h>\r | |
58 | #include <unistd.h>\r | |
59 | \r | |
60 | #define MAXITERATIONS 100\r | |
61 | \r | |
62 | /*\r | |
63 | * Open a directory.\r | |
64 | */\r | |
65 | DIR *\r | |
66 | opendir(const char *name)\r | |
67 | {\r | |
68 | _DIAGASSERT(name != NULL);\r | |
69 | \r | |
70 | return (__opendir2(name, DTF_HIDEW|DTF_NODUP));\r | |
71 | }\r | |
72 | \r | |
73 | DIR *\r | |
74 | __opendir2(const char *name, int flags)\r | |
75 | {\r | |
76 | DIR *dirp = NULL;\r | |
77 | int fd;\r | |
78 | int serrno;\r | |
79 | struct stat sb;\r | |
80 | int incr;\r | |
81 | \r | |
82 | _DIAGASSERT(name != NULL);\r | |
83 | \r | |
84 | if ((fd = open(name, O_RDONLY | O_NONBLOCK, 0)) == -1 ||\r | |
85 | fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)\r | |
86 | goto error;\r | |
87 | if (fstat(fd, &sb) || !S_ISDIR(sb.st_mode)) {\r | |
88 | errno = ENOTDIR;\r | |
89 | goto error;\r | |
90 | }\r | |
91 | if ((dirp = (DIR *)malloc(sizeof(DIR))) == NULL)\r | |
92 | goto error;\r | |
93 | dirp->dd_buf = NULL;\r | |
94 | \r | |
95 | /*\r | |
96 | * If the machine's page size is an exact multiple of DIRBLKSIZ,\r | |
97 | * use a buffer that is cluster boundary aligned.\r | |
98 | * Hopefully this can be a big win someday by allowing page trades\r | |
99 | * to user space to be done by getdirentries()\r | |
100 | */\r | |
101 | incr = DIRBLKSIZ;\r | |
102 | \r | |
103 | dirp->dd_len = incr;\r | |
104 | dirp->dd_buf = malloc((size_t)dirp->dd_len);\r | |
105 | if (dirp->dd_buf == NULL)\r | |
106 | goto error;\r | |
107 | dirp->dd_seek = 0;\r | |
108 | flags &= ~DTF_REWIND;\r | |
109 | \r | |
110 | dirp->dd_loc = 0;\r | |
111 | dirp->dd_fd = fd;\r | |
112 | dirp->dd_flags = flags;\r | |
113 | \r | |
114 | /*\r | |
115 | * Set up seek point for rewinddir.\r | |
116 | */\r | |
117 | #ifdef _REENTRANT\r | |
118 | if (__isthreaded) {\r | |
119 | if ((dirp->dd_lock = malloc(sizeof(mutex_t))) == NULL)\r | |
120 | goto error;\r | |
121 | mutex_init((mutex_t *)dirp->dd_lock, NULL);\r | |
122 | }\r | |
123 | #endif\r | |
124 | dirp->dd_internal = NULL;\r | |
125 | return (dirp);\r | |
126 | error:\r | |
127 | serrno = errno;\r | |
128 | if (dirp && dirp->dd_buf)\r | |
129 | free(dirp->dd_buf);\r | |
130 | if (dirp)\r | |
131 | free(dirp);\r | |
132 | if (fd != -1)\r | |
133 | (void)close(fd);\r | |
134 | errno = serrno;\r | |
135 | return NULL;\r | |
136 | }\r |