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__FSEXT_get_function
====================

Syntax
------

     #include <sys/fsext.h>
     
     __FSEXT_Function *__FSEXT_get_function(int _fd);

This function is part of the File System Extensions:.  It is used   
internal to libc.a to redirect I/O requests to the appropriate
extensions.

Example
-------

     _read(int fd, void *buf, int len)
     {
       __FSEXT_Function *func = __FSEXT_get_function(fd);
       if (func)
       {
         int rv;
         if (func(__FSEXT_read, &rv, &fd))
           return rv;
       }
       /* rest of read() */
     }