Select call and 32 descriptors

[Prashun]

Hi
I ma using select calll to multiplex the socket descriptors. As soon as I reach more than 32 the system is creating problem and just freezes out.
Can some body eleborate on this and provide some way to implement about 100 descriptors. All needed to be opened.
Thanks
Prashun

[Vincent Fleming]

You don't say what version of the OS you're running, but from the select(2) man page for 11i, I got this:

[EINVAL] The nfds argument is less than 0, or is greater than or equal to the value of MAXFUPLIM, which specifies the absolute maximum number of files a process can have open at one time. If the resource limit RLIMIT_NOFILE for a process is less than or equal to 2048, MAXFUPLIM is considered to be 2048.

You may be exceeding the maximum number of open files allowed in your kernel tuning. I would check those kernel tunables.

Good luck

[Klaus Crusius]

Make sure you are using the ASCII headers and the convenience macros all described on the man page "man 2 select".

Also obey the maximum number of open files for you process. Use "man 2 getrlimit/setrlimit" to increase the per process number of allowed open files.

On HPUX10.02 and HPUX11.0 I did not see problems with that.

Regards, Klaus