PR_Poll function

I have a question about the operation of the PR_Poll function. Unlike  
the Unix socket API, NSPR seems to use an array of file descriptors,  
instead of a set (fd_set). This presents me with a number of problems,  
most notably how to keep a list of all current socket connections in  
my program. Unlike a set, if I remove a socket from the array, it  
would seem like I would have to move everything else in the array to  
account for the missing slot. The way out of this would be for the  
function to keep searching through the array until the number of  
sockets in the array (second parameter) are all accounted for. This  
would allow me to create an array of max socket numbers and then leave  
empty slots in the array when I close one.

The simplest way to describe this is a basic free list (malloc) or  
garbage collection system. My question is basically, how did you guys  
plan on people using the NSPR API to deal with socket arrays? Did you  
intend for the user to have to restructure the array constantly?

Andy