Fopen() on solaris 7 and solaris 8

Question

Hi,
When I am trying to open more than 255 files using fopen()
call, I am getting the different behaviour on solaris 7 and
solaris 8. On sol 7 it returns 0 and errno set to 0. On
sol 8 it returns 0, but errno set to 24. My application is
using value of errno to implement the code to allow users
to open more than 255 files. But it is failing on solaris 8
becoz of the above behaviour. Is there any change in fopen()
call?
I have to fix my application ASAP. Any help in this regard
will be greatly appreciated.
regards,
vinod.

Answer 1

Hi Vinod,
The err no 24 being returned by Solaris 8 is correct.
if rlimit has been adjusted to greater than 256 fds, and
fopen()'s call to open() returns a descriptor value greater
than 255, fopen() used to return NULL but did not set
the errno. hence it was fixed to set the errno to EMFILE
which does correctly say " Too Many open Files".
HTH
Shridhar