[fpc-devel] "Unable to open file" on Linux randomly in a CGI application when using templates
jonas.maebe at elis.ugent.be
Mon Mar 15 10:58:43 CET 2010
On 15 Mar 2010, at 03:17, ABorka wrote:
> On 3/14/2010 16:08, Jonas Maebe wrote:
>> On 14 Mar 2010, at 23:39, ABorka wrote:
>>> I have a CGI application with a datamodule that is using templates
>>> to generate the response pages (accessing a MySQL database through
>>> Every once in a while, I'm getting an "Unable to open file"
>>> exception that points to one of the templates the website is using.
>>> What could be the problem?
>> Maybe you run out of file handles?
> If that is the case, shouldn't something be in the syslog or some
> other log?
No. It's a generic user error like any other.
> Is there any way I can check this for sure like last system error
> string or something?
You can call sysutils.GetLastOSError and look up the number in errno.inc
> The exception message only says that "Unable to open file
> I checked the /proc/sys/fs/file-max and it shows 294692
The per-user open file handles limit is different. You can see it in
the output of "ulimit -a" under bash (if it says "unlimited", it means
that it uses the system limit). Maybe you leak file handles somewhere.
You can look in /proc/<pid>/fd from time to time to see whether the
number of open files keeps growing over time.
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