diff options
Diffstat (limited to 'sysdeps/posix/opendir.c')
| -rw-r--r-- | sysdeps/posix/opendir.c | 108 |
1 files changed, 5 insertions, 103 deletions
diff --git a/sysdeps/posix/opendir.c b/sysdeps/posix/opendir.c index d925804e89..dea23b2ff5 100644 --- a/sysdeps/posix/opendir.c +++ b/sysdeps/posix/opendir.c @@ -15,24 +15,13 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -#include <assert.h> -#include <errno.h> -#include <limits.h> -#include <stdbool.h> -#include <stddef.h> -#include <stdlib.h> #include <dirent.h> #include <fcntl.h> -#include <sys/param.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <unistd.h> -#include <stdio.h> -#include <string.h> - -#include <dirstream.h> +#include <errno.h> +#include <stdio.h> /* For BUFSIZ. */ +#include <sys/param.h> /* For MIN and MAX. */ + #include <not-cancel.h> -#include <kernel-features.h> /* The st_blksize value of the directory is used as a hint for the size of the buffer which receives struct dirent values from the @@ -40,49 +29,8 @@ file system provides a bogus value. */ #define MAX_DIR_BUFFER_SIZE 1048576U -/* opendir() must not accidentally open something other than a directory. - Some OS's have kernel support for that, some don't. In the worst - case we have to stat() before the open() AND fstat() after. - - We have to test at runtime for kernel support since libc may have - been compiled with different headers to the kernel it's running on. - This test can't be done reliably in the general case. We'll use - /dev/null, which if it's not a device lots of stuff will break, as - a guinea pig. It may be missing in chroot environments, so we - make sure to fail safe. */ -#ifdef O_DIRECTORY -# ifdef O_DIRECTORY_WORKS -# define o_directory_works 1 -# define tryopen_o_directory() while (1) /* This must not be called. */ -# else -static int o_directory_works; - -static void -tryopen_o_directory (void) -{ - int serrno = errno; - int x = __open_nocancel ("/dev/null", O_RDONLY|O_NDELAY|O_DIRECTORY); - - if (x >= 0) - { - __close_nocancel_nostatus (x); - o_directory_works = -1; - } - else if (errno != ENOTDIR) - o_directory_works = -1; - else - o_directory_works = 1; - - __set_errno (serrno); -} -# endif -# define EXTRA_FLAGS O_DIRECTORY -#else -# define EXTRA_FLAGS 0 -#endif - enum { - opendir_oflags = O_RDONLY|O_NDELAY|EXTRA_FLAGS|O_LARGEFILE|O_CLOEXEC + opendir_oflags = O_RDONLY|O_NDELAY|O_DIRECTORY|O_LARGEFILE|O_CLOEXEC }; static bool @@ -98,21 +46,6 @@ invalid_name (const char *name) return false; } - -static bool -need_isdir_precheck (void) -{ -#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. */ - return o_directory_works < 0; -#endif - return true; -} - static DIR * opendir_tail (int fd) { @@ -144,22 +77,6 @@ __opendirat (int dfd, const char *name) if (__glibc_unlikely (invalid_name (name))) return NULL; - if (need_isdir_precheck ()) - { - /* 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. */ - struct stat64 statbuf; - if (__glibc_unlikely (__fxstatat64 (_STAT_VER, dfd, name, - &statbuf, 0) < 0)) - return NULL; - if (__glibc_unlikely (! S_ISDIR (statbuf.st_mode))) - { - __set_errno (ENOTDIR); - return NULL; - } - } - return opendir_tail (__openat_nocancel (dfd, name, opendir_oflags)); } #endif @@ -172,21 +89,6 @@ __opendir (const char *name) if (__glibc_unlikely (invalid_name (name))) return NULL; - if (need_isdir_precheck ()) - { - /* 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. */ - struct stat64 statbuf; - if (__glibc_unlikely (__xstat64 (_STAT_VER, name, &statbuf) < 0)) - return NULL; - if (__glibc_unlikely (! S_ISDIR (statbuf.st_mode))) - { - __set_errno (ENOTDIR); - return NULL; - } - } - return opendir_tail (__open_nocancel (name, opendir_oflags)); } weak_alias (__opendir, opendir) |