#include <linux/posix_types.h>
+#include "kernel-features.h"
+
+#ifdef __NR_getdents64
+#ifndef __ASSUME_GETDENTS64_SYSCALL
+#ifndef __GETDENTS
+/* The variable is shared between all *getdents* calls. */
+int __have_no_getdents64;
+#else
+extern int __have_no_getdents64;
+#endif
+#endif
+#endif
+
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
extern int __syscall_getdents (int fd, char *__unbounded buf, size_t nbytes);
char d_name[256];
};
+struct kernel_dirent64
+ {
+ u_int64_t d_ino;
+ int64_t d_off;
+ unsigned short int d_reclen;
+ unsigned char d_type;
+ char d_name[256];
+ };
+
#ifndef __GETDENTS
# define __GETDENTS __getdents
+#endif
+#ifndef DIRENT_TYPE
# define DIRENT_TYPE struct dirent
#endif
#ifndef DIRENT_SET_DP_INO
internal_function
__GETDENTS (int fd, char *buf, size_t nbytes)
{
- off_t last_offset = -1;
- size_t red_nbytes;
- struct kernel_dirent *skdp, *kdp;
DIRENT_TYPE *dp;
- int retval;
- const size_t size_diff = (offsetof (DIRENT_TYPE, d_name)
- - offsetof (struct kernel_dirent, d_name));
-
- red_nbytes = MIN (nbytes
- - ((nbytes / (offsetof (DIRENT_TYPE, d_name) + 14))
- * size_diff),
- nbytes - size_diff);
-
- dp = (DIRENT_TYPE *) buf;
- skdp = kdp = __alloca (red_nbytes);
-
- retval = INLINE_SYSCALL (getdents, 3, fd,
- CHECK_N ((char *) kdp, red_nbytes), red_nbytes);
-
- if (retval == -1)
- return -1;
+ off_t last_offset = -1;
+ ssize_t retval;
- while ((char *) kdp < (char *) skdp + retval)
+#ifdef __NR_getdents64
+#ifndef __ASSUME_GETDENTS64_SYSCALL
+ if (!__have_no_getdents64)
+#endif
{
- const size_t alignment = __alignof__ (DIRENT_TYPE);
- /* Since kdp->d_reclen is already aligned for the kernel structure
- this may compute a value that is bigger than necessary. */
- size_t new_reclen = ((kdp->d_reclen + size_diff + alignment - 1)
- & ~(alignment - 1));
- if ((char *) dp + new_reclen > buf + nbytes)
+#ifndef __ASSUME_GETDENTS64_SYSCALL
+ int saved_errno = errno;
+#endif
+ char *kbuf = buf;
+ size_t kbytes = nbytes;
+ if (offsetof (DIRENT_TYPE, d_name)
+ < offsetof (struct kernel_dirent64, d_name)
+ && nbytes <= sizeof (DIRENT_TYPE))
{
- /* Our heuristic failed. We read too many entries. Reset
- the stream. */
- assert (last_offset != -1);
- __lseek (fd, last_offset, SEEK_SET);
-
- if ((char *) dp == buf)
+ kbytes = nbytes + offsetof (struct kernel_dirent64, d_name)
+ - offsetof (DIRENT_TYPE, d_name);
+ kbuf = __alloca(kbytes);
+ }
+ retval = INLINE_SYSCALL (getdents64, 3, fd, CHECK_N(kbuf, kbytes),
+ kbytes);
+#ifndef __ASSUME_GETDENTS64_SYSCALL
+ if (retval != -1 && errno != -EINVAL)
+#endif
+ {
+ struct kernel_dirent64 *kdp;
+ const size_t size_diff = (offsetof (struct kernel_dirent64, d_name)
+ - offsetof (DIRENT_TYPE, d_name));
+
+ /* If the structure returned by the kernel is identical to what we
+ need, don't do any conversions. */
+ if (offsetof (DIRENT_TYPE, d_name)
+ == offsetof (struct kernel_dirent64, d_name)
+ && sizeof (dp->d_ino) == sizeof (kdp->d_ino)
+ && sizeof (dp->d_off) == sizeof (kdp->d_off))
+ return retval;
+
+ dp = (DIRENT_TYPE *)buf;
+ kdp = (struct kernel_dirent64 *)kbuf;
+ while ((char *) kdp < kbuf + retval)
{
- /* The buffer the user passed in is too small to hold even
- one entry. */
- __set_errno (EINVAL);
- return -1;
+ const size_t alignment = __alignof__ (DIRENT_TYPE);
+ /* Since kdp->d_reclen is already aligned for the kernel
+ structure this may compute a value that is bigger
+ than necessary. */
+ size_t old_reclen = kdp->d_reclen;
+ size_t new_reclen = ((old_reclen - size_diff + alignment - 1)
+ & ~(alignment - 1));
+ u_int64_t d_ino = kdp->d_ino;
+ int64_t d_off = kdp->d_off;
+ unsigned char d_type = kdp->d_type;
+
+ DIRENT_SET_DP_INO(dp, d_ino);
+ dp->d_off = d_off;
+ if ((sizeof (dp->d_ino) != sizeof (kdp->d_ino)
+ && dp->d_ino != d_ino)
+ || (sizeof (dp->d_off) != sizeof (kdp->d_off)
+ && dp->d_off != d_off))
+ {
+ /* Overflow. If there was at least one entry
+ before this one, return them without error,
+ otherwise signal overflow. */
+ if (last_offset != -1)
+ {
+ __lseek (fd, last_offset, SEEK_SET);
+ return (char *) dp - buf;
+ }
+ __set_errno (EOVERFLOW);
+ return -1;
+ }
+
+ last_offset = d_off;
+ dp->d_reclen = new_reclen;
+ dp->d_type = d_type;
+ memmove (dp->d_name, kdp->d_name,
+ old_reclen - offsetof (struct kernel_dirent64, d_name));
+
+ dp = (DIRENT_TYPE *) ((char *) dp + new_reclen);
+ kdp = (struct kernel_dirent64 *) ((char *) kdp + old_reclen);
}
- break;
+ return (char *) dp - buf;
}
- last_offset = kdp->d_off;
- DIRENT_SET_DP_INO(dp, kdp->d_ino);
- dp->d_off = kdp->d_off;
- dp->d_reclen = new_reclen;
- dp->d_type = DT_UNKNOWN;
- memcpy (dp->d_name, kdp->d_name,
- kdp->d_reclen - offsetof (struct kernel_dirent, d_name));
-
- dp = (DIRENT_TYPE *) ((char *) dp + new_reclen);
- kdp = (struct kernel_dirent *) (((char *) kdp) + kdp->d_reclen);
+#ifndef __ASSUME_GETDENTS64_SYSCALL
+ __set_errno (saved_errno);
+ __have_no_getdents64 = 1;
+#endif
+ }
+#endif
+ {
+ size_t red_nbytes;
+ struct kernel_dirent *skdp, *kdp;
+ const size_t size_diff = (offsetof (DIRENT_TYPE, d_name)
+ - offsetof (struct kernel_dirent, d_name));
+
+ red_nbytes = MIN (nbytes
+ - ((nbytes / (offsetof (DIRENT_TYPE, d_name) + 14))
+ * size_diff),
+ nbytes - size_diff);
+
+ dp = (DIRENT_TYPE *) buf;
+ skdp = kdp = __alloca (red_nbytes);
+
+ retval = INLINE_SYSCALL (getdents, 3, fd,
+ CHECK_N ((char *) kdp, red_nbytes), red_nbytes);
+
+ if (retval == -1)
+ return -1;
+
+ while ((char *) kdp < (char *) skdp + retval)
+ {
+ const size_t alignment = __alignof__ (DIRENT_TYPE);
+ /* Since kdp->d_reclen is already aligned for the kernel structure
+ this may compute a value that is bigger than necessary. */
+ size_t new_reclen = ((kdp->d_reclen + size_diff + alignment - 1)
+ & ~(alignment - 1));
+ if ((char *) dp + new_reclen > buf + nbytes)
+ {
+ /* Our heuristic failed. We read too many entries. Reset
+ the stream. */
+ assert (last_offset != -1);
+ __lseek (fd, last_offset, SEEK_SET);
+
+ if ((char *) dp == buf)
+ {
+ /* The buffer the user passed in is too small to hold even
+ one entry. */
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ break;
+ }
+
+ last_offset = kdp->d_off;
+ DIRENT_SET_DP_INO(dp, kdp->d_ino);
+ dp->d_off = kdp->d_off;
+ dp->d_reclen = new_reclen;
+ dp->d_type = DT_UNKNOWN;
+ memcpy (dp->d_name, kdp->d_name,
+ kdp->d_reclen - offsetof (struct kernel_dirent, d_name));
+
+ dp = (DIRENT_TYPE *) ((char *) dp + new_reclen);
+ kdp = (struct kernel_dirent *) (((char *) kdp) + kdp->d_reclen);
+ }
}
return (char *) dp - buf;
projects / thirdparty / glibc.git / commitdiff
