2 * Copyright (c) 1983, 1993
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6 * modification, are permitted provided that the following conditions
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29 * $FreeBSD: src/lib/libc/gen/opendir.c,v 1.10.2.1 2001/06/04 20:59:48 joerg Exp $
31 * @(#)opendir.c 8.8 (Berkeley) 5/1/95
34 #include "namespace.h"
35 #include <sys/param.h>
44 #include "un-namespace.h"
46 #include "gen_private.h"
48 #define DEFAULT_FLAGS (DTF_HIDEW | DTF_NODUP)
51 * Open a directory given its path.
54 opendir(const char *name
)
56 return (__opendir2(name
, DEFAULT_FLAGS
));
60 * Open a directory given a descriptor representing it.
65 return (__fdopendir2(fd
, DEFAULT_FLAGS
));
69 __opendir2(const char *name
, int flags
)
77 * stat() before _open() because opening of special files may be
80 if (stat(name
, &statb
) != 0)
83 fd
= _open(name
, O_RDONLY
| O_NONBLOCK
| O_DIRECTORY
| O_CLOEXEC
);
86 dirp
= __fdopendir2(fd
, flags
);
97 __fdopendir2(int fd
, int flags
)
106 if (_fstat(fd
, &statb
) != 0)
108 if (!S_ISDIR(statb
.st_mode
)) {
112 if (_fcntl(fd
, F_SETFD
, FD_CLOEXEC
) == -1 ||
113 (dirp
= malloc(sizeof(DIR))) == NULL
)
117 * Use the system page size if that is a multiple of DIRBLKSIZ.
118 * Hopefully this can be a big win someday by allowing page
119 * trades to user space to be done by _getdirentries().
121 incr
= getpagesize();
122 if ((incr
% DIRBLKSIZ
) != 0)
126 dirp
->dd_buf
= malloc(dirp
->dd_len
);
127 if (dirp
->dd_buf
== NULL
)
129 flags
&= ~DTF_REWIND
;
133 dirp
->dd_flags
= flags
;
134 dirp
->dd_lock
= NULL
;
137 * Set up seek point for rewinddir.
140 dirp
->dd_rewind
= telldir(dirp
);
143 * The file offset of the fd passed to fdopendir() determines the
144 * initial entry returned by readdir(). Save this offset so that
145 * telldir() right after fdopendir() returns a value pointing to this
147 * We don't have to worry about misaligned file offsets. The kernel
150 if ((dirp
->dd_seek
= lseek(fd
, 0, SEEK_CUR
)) < 0)
158 _reclaim_telldir(dirp
);