MAX FILES PER PROCESS PROBLEM

[dbj.rice%rand-relay at sri-unix.UUCP]

From:  Dave Johnson <dbj.rice at rand-relay>

Under 4.1bsd, you can not make NOFILE greater than 31 thanks to the vread
and vwrite system calls.  In the page table entry for a vread page, there
is a 5-bit wide field called pg_fileno which is set to the file descriptor
number that the page is mapped from.  That is the meaning of the comment:

    #define	NOFILE	20		/* max open files per process */
    /* NOFILE MUST NOT BE >= 31; SEE pte.h */

from param.h where NOFILE is defined.

                                        Dave Johnson
                                        Dept. of Math Science
                                        Rice University
                                        dbj.rice at CSNet-Relay