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authorJim Meyering <jim@meyering.net>2006-08-15 11:08:03 +0000
committerJim Meyering <jim@meyering.net>2006-08-15 11:08:03 +0000
commita0fcf6276707a1a1d4bff445ffc1f3651099d301 (patch)
treea8d50a7fd774e8087545c79c31d8cada302e3252
parent5ad9cd982cf8fe89240cd14e2c91e2ada6cdc5b6 (diff)
downloadcoreutils-a0fcf6276707a1a1d4bff445ffc1f3651099d301.tar.xz
commit, for the record. May never be used.
-rw-r--r--lib/fdopendir-glibc.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/lib/fdopendir-glibc.c b/lib/fdopendir-glibc.c
new file mode 100644
index 000000000..6b66a6f2a
--- /dev/null
+++ b/lib/fdopendir-glibc.c
@@ -0,0 +1,121 @@
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdbool.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#if _LIBC
+# include <dirstream.h>
+# include <not-cancel.h>
+
+#else
+
+# if __GNUC__ < 3
+# define __builtin_expect(expr, expected_val) expr
+# endif
+
+# include "openat.h"
+# define stat64 stat
+# define dirent64 dirent
+# define __fxstat64(V, fd, sb) fstat(fd, sb)
+# define __fcntl fcntl
+# define __set_errno(Val) do { errno = (Val); } while (0)
+# define __libc_lock_init(NAME) ((NAME) = 0, 0)
+# define close_not_cancel_no_status(fd) close (fd)
+# ifdef __i386__
+# define internal_function __attribute ((regparm (3), stdcall))
+# else
+# define internal_function
+# endif
+
+struct __dirstream
+ {
+ int fd; /* File descriptor. */
+
+ char *data; /* Directory block. */
+ size_t allocation; /* Space allocated for the block. */
+ size_t size; /* Total valid data in the block. */
+ size_t offset; /* Current offset into the block. */
+
+ off_t filepos; /* Position of next entry to read. */
+ int lock;
+ };
+#endif
+
+#undef _STATBUF_ST_BLKSIZE
+
+static DIR *
+internal_function
+__alloc_dir (int fd, bool close_fd)
+{
+ if (__builtin_expect (__fcntl (fd, F_SETFD, FD_CLOEXEC), 0) < 0)
+ goto lose;
+
+ size_t allocation;
+#ifdef _STATBUF_ST_BLKSIZE
+ if (__builtin_expect ((size_t) statp->st_blksize >= sizeof (struct dirent64),
+ 1))
+ allocation = statp->st_blksize;
+ else
+#endif
+ allocation = (BUFSIZ < sizeof (struct dirent64)
+ ? sizeof (struct dirent64) : BUFSIZ);
+
+ const int pad = -sizeof (DIR) % __alignof__ (struct dirent64);
+
+ DIR *dirp = (DIR *) malloc (sizeof (DIR) + allocation + pad);
+ if (dirp == NULL)
+ lose:
+ {
+ if (close_fd)
+ {
+ int save_errno = errno;
+ close_not_cancel_no_status (fd);
+ __set_errno (save_errno);
+ }
+ return NULL;
+ }
+ memset (dirp, '\0', sizeof (DIR));
+ dirp->data = (char *) (dirp + 1) + pad;
+ dirp->allocation = allocation;
+ dirp->fd = fd;
+
+ __libc_lock_init (dirp->lock);
+
+ return dirp;
+}
+
+DIR *
+fdopendir (int fd)
+{
+#if 0
+ struct stat64 statbuf;
+
+ if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &statbuf), 0) < 0)
+ return NULL;
+ if (__builtin_expect (! S_ISDIR (statbuf.st_mode), 0))
+ {
+ __set_errno (ENOTDIR);
+ return NULL;
+ }
+ /* Make sure the descriptor allows for reading. */
+ int flags = __fcntl (fd, F_GETFL);
+ if (__builtin_expect (flags == -1, 0))
+ return NULL;
+ if (__builtin_expect ((flags & O_ACCMODE) == O_WRONLY, 0))
+ {
+ __set_errno (EINVAL);
+ return NULL;
+ }
+#endif
+
+ return __alloc_dir (fd, false);
+}