🚀 go-pugleaf

Archive-name: msdos-programmer-faq/diff3
Last-modified: 22 August 1992


Please see part 1 for explanations.

- 12>Last-modified: 19 July 1992
+ 12>Last-modified: 22 August 1992

+168>Q407. How can my program open more files than DOS's limit of 20?
+170>    (This is a summary of an article Ralf Brown posted on 8 August 1992.)
+172>    There are separate limits on files and file handles.  For example,
+173>    DOS opens three files but five file handles:  CON (stdin, stdout,
+174>    and stderr), AUX (stdaux), and PRN (stdprn).
+176>    The limit in FILES= in CONFIG.SYS is a system-wide limit on files
+177>    opened by all programs (including the three that DOS opens and any
+178>    opened by TSRs); each process has a limit of 20 handles (including
+179>    the five that DOS opens).  Example:  CONFIG.SYS has FILES=40.  Then
+180>    program #1 will be able to open 15 file handles.  Assuming that the
+181>    program actually does open 15 handles pointing to 15 different
+182>    files, other programs could still open a total of 22 files (40-3-15
+183>    = 22), though no one program could open more than 15 file handles.
+185>    If you're running DOS 3.3 or later, you can increase the per-process
+186>    limit of 20 file handles by a call to INT 21 function 67, Set Handle
+187>    Count.  Your program is still limited by the system-wide limit on
+188>    open files, so you may also need to increase the FILES= value in
+189>    your CONFIG.SYS file (and reboot).  The run-time library that you're
+190>    using may have a fixed-size table of file handles, so you may also
+191>    need to get source code for the module that contains the table,
+192>    increase the table size, and recompile it.

-499>    high-level languages provide a way to do this.
+525>    high-level languages provide a way to do this; for instance, in
+526>    Turbo Pascal it's Lo(DosExitCode) and the high byte gives the way
+527>    in which the child terminated.  In Microsoft C, the exit code of a
+528>    synchronous child process is the return value of the spawn-typoe
+529>    function that creates the process.

+690>Q709. What can I use to manage versions of software?
+692>    In PD1:<MSDOS.PGMUTL> at Simtel you'll find RCS55.ZIP, 388K dated 18
+693>    Dec 1991.  I haven't used it myself, but I understand this is a port
+694>    of the Unix RCS utility, but is limited to one-character extensions
+695>    on filenames (no .CPP).

-- 

Stan Brown, Oak Road Systems                      brown@Ncoast.ORG