MAX limit of file descriptor

[Gaurav Jain]

I believe you can achieve the 'effect' of setting the maximum number of
open file descriptors to 'infinite' by using the following (untested code!):

<snip>
#include <sys/time.h>
#include <sys/resource.h>

struct rlimit rlim;
rlim.rlim_cur = RLIM_INFINTY;
rlim.rlim_max = RLIM_INFINITY;

int ret = setrlimit(RLIMIT_NOFILE, &rlim);
</snip>

Note that what Peter pointed out is more or less correct. You can't *actually
*have infinite file descriptors. The above code just ensures that the
kernel won't perform any checks on the number of open file descriptors. So,
if you hit a real resource limit; like no more memory left for opening
files, you would still get an error. My feeling is that this isn't a wise
thing to do. It's always better to know a precise number of the upper limit
rather than an arbitrarily large number.

~ Gaurav


On Sat, Feb 9, 2013 at 4:49 PM, Peter Teoh <htmldeveloper at gmail.com> wrote:

> i can only make a general statement, may not be always true/false:
>
> in the kernel almost EVERYTHING HAS TO BE FINITE....and this is cater for
> the fact that
>
> but at the userspace or application level, u can design structures to be
> infinite.   eg, I used python for large number calculation, and so far it
> has not limits, but I am sure at the representation level, there is
> one....but because i don't know the datastructure used, i don't know the
> limits.
>
>
> On Sat, Feb 9, 2013 at 1:10 PM, horseriver <horserivers at gmail.com> wrote:
>
>> hi:)
>>
>>    In one process ,what is the max number of opening file descriptor ?
>>    Can it be set to infinite ?
>>
>>    In network programing ,what is the essential for  the maximum of
>> connections
>>    dealed per second
>>
>> thanks!
>>
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>
>
>
> --
> Regards,
> Peter Teoh
>
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>


-- 
Gaurav Jain
Associate Software Engineer
VxVM Escalations Team, SAMG
Symantec Software India Pvt. Ltd.
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