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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 a multiple of DIRBLKSIZ. Make sure the buffer size is
118 * decent (at least 16K) to avoid unnecessary excess system calls.
120 incr = DIRBLKSIZ * 16;
123 if ((incr % DIRBLKSIZ) != 0)
127 dirp->dd_buf = malloc(dirp->dd_len);
128 if (dirp->dd_buf == NULL)
130 flags &= ~DTF_REWIND;
134 dirp->dd_flags = flags;
135 dirp->dd_lock = NULL;
138 * Set up seek point for rewinddir.
141 dirp->dd_rewind = telldir(dirp);
144 * The file offset of the fd passed to fdopendir() determines the
145 * initial entry returned by readdir(). Save this offset so that
146 * telldir() right after fdopendir() returns a value pointing to this
148 * We don't have to worry about misaligned file offsets. The kernel
151 if ((dirp->dd_seek = lseek(fd, 0, SEEK_CUR)) < 0)
159 _reclaim_telldir(dirp);