DIR *
__fdopendir (int fd)
{
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;
}
return __alloc_dir (fd, false, flags, &statbuf);
}
/* Open a directory stream on NAME. */
DIR *
__opendir (const char *name)
{
struct stat64 statbuf;
if (__builtin_expect (name[0], '\1') == '\0')
{
/* POSIX.1-1990 says an empty name gets ENOENT;
but `open' might like it fine. */
__set_errno (ENOENT);
return NULL;
}
#ifdef O_DIRECTORY
/* Test whether O_DIRECTORY works. */
if (o_directory_works == 0)
tryopen_o_directory ();
/* We can skip the expensive `stat' call if O_DIRECTORY works. */
if (o_directory_works < 0)
#endif
{
/* We first have to check whether the name is for a directory. We
cannot do this after the open() call since the open/close operation
performed on, say, a tape device might have undesirable effects. */
if (__builtin_expect (__xstat64 (_STAT_VER, name, &statbuf), 0) < 0)
return NULL;
if (__builtin_expect (! S_ISDIR (statbuf.st_mode), 0))
{
__set_errno (ENOTDIR);
return NULL;
}
}
int fd = open_not_cancel_2 (name, O_RDONLY|O_NDELAY|EXTRA_FLAGS|O_LARGEFILE);
if (__builtin_expect (fd, 0) < 0)
return NULL;
/* Now make sure this really is a directory and nothing changed since
the `stat' call. We do not have to perform the test for the
descriptor being associated with a directory if we know the
O_DIRECTORY flag is honored by the kernel. */
if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &statbuf), 0) < 0)
goto lose;
#ifdef O_DIRECTORY
if (o_directory_works <= 0)
#endif
{
if (__builtin_expect (! S_ISDIR (statbuf.st_mode), 0))
{
__set_errno (ENOTDIR);
lose:
close_not_cancel_no_status (fd);
return NULL;
}
}
return __alloc_dir (fd, true, &statbuf);
}
static DIR *
opendir_tail (int fd)
{
if (__glibc_unlikely (fd < 0))
return NULL;
/* Now make sure this really is a directory and nothing changed since the
`stat' call. The S_ISDIR check is superfluous if O_DIRECTORY works,
but it's cheap and we need the stat call for st_blksize anyway. */
struct stat64 statbuf;
if (__glibc_unlikely (__fxstat64 (_STAT_VER, fd, &statbuf) < 0))
goto lose;
if (__glibc_unlikely (! S_ISDIR (statbuf.st_mode)))
{
__set_errno (ENOTDIR);
lose:
close_not_cancel_no_status (fd);
return NULL;
}
return __alloc_dir (fd, true, 0, &statbuf);
}
internal_function
__opendirat (int dfd, const char *name)
{
struct stat64 statbuf;
struct stat64 *statp = NULL;
if (__builtin_expect (name[0], '\1') == '\0')
{
/* POSIX.1-1990 says an empty name gets ENOENT;
but `open' might like it fine. */
__set_errno (ENOENT);
return NULL;
}
#ifdef O_DIRECTORY
/* Test whether O_DIRECTORY works. */
if (o_directory_works == 0)
tryopen_o_directory ();
/* We can skip the expensive `stat' call if O_DIRECTORY works. */
if (o_directory_works < 0)
#endif
{
/* We first have to check whether the name is for a directory. We
cannot do this after the open() call since the open/close operation
performed on, say, a tape device might have undesirable effects. */
if (__builtin_expect (__xstat64 (_STAT_VER, name, &statbuf), 0) < 0)
return NULL;
if (__builtin_expect (! S_ISDIR (statbuf.st_mode), 0))
{
__set_errno (ENOTDIR);
return NULL;
}
}
int flags = O_RDONLY|O_NDELAY|EXTRA_FLAGS|O_LARGEFILE;
#ifdef O_CLOEXEC
flags |= O_CLOEXEC;
#endif
int fd;
#ifdef IS_IN_rtld
assert (dfd == AT_FDCWD);
fd = open_not_cancel_2 (name, flags);
#else
fd = openat_not_cancel_3 (dfd, name, flags);
#endif
if (__builtin_expect (fd, 0) < 0)
return NULL;
#ifdef O_DIRECTORY
if (o_directory_works <= 0)
#endif
{
/* Now make sure this really is a directory and nothing changed since
the `stat' call. */
if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &statbuf), 0) < 0)
goto lose;
if (__builtin_expect (! S_ISDIR (statbuf.st_mode), 0))
{
__set_errno (ENOTDIR);
lose:
close_not_cancel_no_status (fd);
return NULL;
}
statp = &statbuf;
}
return __alloc_dir (fd, true, 0, statp);
}
