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* sysdeps/unix/sysv/linux/getdents.c (__getdents): Avoid initial
	lseek call be passing in a buffer which never allow a successful
	first getdents syscall if not at leas the initial entry can be
	stored in the user buffer.
This commit is contained in:
Ulrich Drepper
2000-04-10 05:25:42 +00:00
parent 8956ac9e97
commit 4186c9f42b
3 changed files with 19 additions and 4 deletions
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12
sysdeps/unix/sysv/linux/getdents.c
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@@ -17,6 +17,7 @@
Boston, MA 02111-1307, USA. */
#include <alloca.h>
#include <assert.h>
#include <errno.h>
#include <dirent.h>
#include <stddef.h>
@@ -33,7 +34,7 @@
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
extern int __syscall_getdents __P ((int fd, char *buf, size_t nbytes));
extern int __syscall_getdents (int fd, char *buf, size_t nbytes);
/* For Linux we need a special version of this file since the
definition of `struct dirent' is not the same for the kernel and
@@ -67,7 +68,7 @@ ssize_t
internal_function
__getdents (int fd, char *buf, size_t nbytes)
{
off_t last_offset = __lseek (fd, 0, SEEK_CUR);
off_t last_offset = -1;
size_t red_nbytes;
struct kernel_dirent *skdp, *kdp;
struct dirent *dp;
@@ -75,8 +76,10 @@ __getdents (int fd, char *buf, size_t nbytes)
const size_t size_diff = (offsetof (struct dirent, d_name)
- offsetof (struct kernel_dirent, d_name));
red_nbytes = nbytes - ((nbytes / (offsetof (struct dirent, d_name) + 14))
* size_diff);
red_nbytes = MIN (nbytes
- ((nbytes / (offsetof (struct dirent, d_name) + 14))
* size_diff),
nbytes - size_diff);
dp = (struct dirent *) buf;
skdp = kdp = __alloca (red_nbytes);
@@ -97,6 +100,7 @@ __getdents (int fd, char *buf, size_t 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)