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* sysdeps/unix/sysv/linux/getdents.c (__getdents): The Linux
	kernel does not allow relative seeks on descriptors associated
	with directories.  Go back to get the position in the directory
	every time we enter the function.  Return -1 and set errno if one
	entry could be read from the kernel but does not fit into the
	buffer passed in by the user.
This commit is contained in:
Ulrich Drepper 2000-04-07 06:50:46 +00:00
parent a0dc52061f
commit f11b9da654
2 changed files with 20 additions and 9 deletions
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7
ChangeLog
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@ -1,5 +1,12 @@
2000-04-06 Ulrich Drepper <drepper@redhat.com>
* sysdeps/unix/sysv/linux/getdents.c (__getdents): The Linux
kernel does not allow relative seeks on descriptors associated
with directories. Go back to get the position in the directory
every time we enter the function. Return -1 and set errno if one
entry could be read from the kernel but does not fit into the
buffer passed in by the user.
* locale/programs/charmap.c (charmap_new_char): Add parameter step.
Support ..(2).. ellipsis.
(parse_charmap): Recognize ..(2).. etc and pass step down.

22
sysdeps/unix/sysv/linux/getdents.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1993, 95, 96, 97, 98, 99 Free Software Foundation, Inc.
/* Copyright (C) 1993, 95, 96, 97, 98, 99, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -67,7 +67,7 @@ ssize_t
internal_function
__getdents (int fd, char *buf, size_t nbytes)
{
off_t last_offset = 0;
off_t last_offset = __lseek (fd, 0, SEEK_CUR);
size_t red_nbytes;
struct kernel_dirent *skdp, *kdp;
struct dirent *dp;
@ -96,13 +96,17 @@ __getdents (int fd, char *buf, size_t nbytes)
if ((char *) dp + new_reclen > buf + nbytes)
{
/* Our heuristic failed. We read too many entries. Reset
the stream. `last_offset' contains the last known
position. If it is zero this is the first record we are
reading. In this case do a relative search. */
if (last_offset == 0)
__lseek (fd, -retval, SEEK_CUR);
else
__lseek (fd, last_offset, SEEK_SET);
the stream. */
__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;
}