ID: 38758
Comment by: judas dot iscariote at gmail dot com
Reported By: geoffrey at google dot com
Status: Open
Bug Type: Filesystem function related
Operating System: Redhat Linux 2.4.22
PHP Version: 5.1.6
New Comment:
AFAIK, LFS support is not working properly and IIRC last time I saw
developer response, this is scheduled to be fixed only in PHP6.
somebody can correct me If I wrong.
Previous Comments:
------------------------------------------------------------------------
[2006-09-09 00:42:57] geoffrey at google dot com
Description:
------------
fseek returns false if offset is over 10GB (10737418239 bytes). This
could be an underlying problem with llseek.
I'm running php 5.1.6. my config line:
CFLAGS="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64" ./configure
Using stock php.ini-dist
Reproduce code:
---------------
#!/usr/local/src/php-5.1.6/sapi/cli/php -q
<?
$file = "bigfile"; // file is 20GB large
$fp = fopen($file, 'r');
fseek($fp, 10737418239, SEEK_CUR);
$line = fgets($fp, 512);
echo $line; // prints the correct line
echo ftell($fp); // returns -214748361201
rewind($fp);
fseek($fp, 10737418240, SEEK_CUR);
$line = fgets($fp, 512);
echo $line; // prints the first line of the file
echo ftell($fp); // returns 54 which is the strlen() of line 1
Expected result:
----------------
both fseeks should be 1 byte apart and should return successful. Both
fgets should return the same data only 1 byte apart. ftell should
return 10737418239 for the first run and 10737418240 for the second.
Actual result:
--------------
The first fseek is successful and fgets returns the correct bytes. The
second fseek (1 byte beyond 10GB) fails and returns bytes at the
begining of the file.
ftell also seems broken as it returns -214748361201 in the first run.
It returns the correct offset in the second because fseek fails and
sets the offset to the begining of the file.
strace output:
<snip>...
lstat64("bigfile", {st_mode=S_IFREG|0666, st_size=20304186228, ...}) =
0
open("bigfile", O_RDONLY|O_LARGEFILE) = 3
fstat64(3, {st_mode=S_IFREG|0666, st_size=20304186228, ...}) = 0
_llseek(3, 0, [0], SEEK_CUR) = 0
_llseek(3, 2147483647, [2147483647], SEEK_SET) = 0
read(3, "<snip>"..., 8192) = 8192
write(1, "<snip>"..., 37,<snip>
) = 37
write(1, "-2147483612", 11-2147483612) = 11
_llseek(3, 0, [0], SEEK_SET) = 0
_llseek(3, 18446744071562067968, 0xbfffcdf0, SEEK_SET) = -1 EINVAL
(Invalid argument)
read(3, "<snip>"..., 8192) = 8192
write(1, "<snip>"..., 54<snip>
) = 54
write(1, "54", 254) = 2
close(3) = 0
close(0)
...</snip>
Geoff
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=38758&edit=1
