Nicholas Burlett wrote:
> On Apr 22, 2013, at 10:09 AM, Ben Franksen <ben.franksen-
bgeptl67xyczqb+pc5n...@public.gmane.org> wrote:
>
>> Ben Franksen wrote:
>>> Ben Franksen wrote:
>>>> So you try to allocate a ridiculous amount of memory which fails of
>>> course.
>>> ... The problem
>>> is that the call to pathconf returns 2147483647.
>>
>> I looked up pathconf in the man pages ('man pathconf') and see:
>>
>> Some returned values may be huge; they are not suitable for
>> allocating memory.
>>
>
> That's really interesting… what version of libc are you using? And on what
host OS?
Nothing special (I think!):
ben@sarun[1]: ~ > uname -a
Linux sarun 3.2.0-4-amd64 #1 SMP Debian 3.2.41-2 x86_64 GNU/Linux
ben@sarun[1]: ~/tmp > dpkg -s libc6:amd64
Package: libc6
Status: install ok installed
Priority: required
Section: libs
Installed-Size: 9517
Maintainer: GNU Libc Maintainers <debian-gl...@lists.debian.org>
Architecture: amd64
Multi-Arch: same
Source: eglibc
Version: 2.13-38
Replaces: libc6-amd64
Provides: glibc-2.13-1
Depends: libc-bin (= 2.13-38), libgcc1
Suggests: glibc-doc, debconf | debconf-2.0, locales
Breaks: locales (<< 2.13), locales-all (<< 2.13), lsb-core (<= 3.2-27), nscd
(<< 2.13)
Conflicts: prelink (<= 0.0.20090311-1), tzdata (<< 2007k-1), tzdata-etch
Conffiles:
/etc/ld.so.conf.d/x86_64-linux-gnu.conf 593ad12389ab2b6f952e7ede67b8fbbf
I wrote a little test program that returns the value returned by pathconf
for a given start path, which is enlightening:
ben@sarun[1]: ~/tmp > cat test-unistd.c
#include <unistd.h>
#include <stdio.h>
int main (int argc, char **argv)
{
printf("pathconf(\"%s\", _PC_NAME_MAX)=%ld\n", argv[1],
pathconf(argv[1], _PC_NAME_MAX));
return 0;
}
ben@sarun[1]: ~/tmp > ./a.out /home/ben
pathconf("/home/ben", _PC_NAME_MAX)=255
ben@sarun[1]: ~/tmp > ./a.out /home/ben/ctl
pathconf("/home/ben/ctl", _PC_NAME_MAX)=2147483647
Note that /home/ben/ctl is a symlink into my sshfs-mounted remote
filesystem.
So, it appears that the locals fs (ext4) has a sane limit but sshfs does
not. BTW, I mounted the sshfs with afuse; this is my setup:
ben@sarun[1]: ~/tmp > pgrep -lf afuse
7611 afuse /home/ben/sshfs -o mount_template=sshfs %r:/ %m -o
idmap=file\,uidfile=/home/ben/.ssh/uid-aragon\,gidfile=/home/ben/.ssh/gid-
aragon\,nomap=ignore\,reconnect -o unmount_template=fusermount -u -z %m
7799 sshfs frank...@aragon.acc.bessy.de:/ /tmp/afuse-
f3tZoi/frank...@aragon.acc.bessy.de -o
idmap=file,uidfile=/home/ben/.ssh/uid-aragon,gidfile=/home/ben/.ssh/gid-
aragon,nomap=ignore,reconnect
Cheers
--
Ben Franksen
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