Q62666: DosSetMaxFH Between 0-39 Fails Under CodeView 3.00

Article: Q62666
Product(s): See article
Version(s): 3.00
Operating System(s): OS/2
Keyword(s): ENDUSER | buglist3.00 | mspl13_basic
Last Modified: 25-JUL-1990

OS/2's DosSetMaxFH routine can be called to reset the OS/2 default
limit of a maximum of 20 open file handles to a larger number. By
definition, DosSetMaxFH fails when trying to set the number smaller
than the current maximum amount of handles. Under OS/2, the default
maximum number of files is 20, so a DosSetMaxFH to a number between
0-19 should fail.

However, under CodeView 3.00, calling DosSetMaxFH with a number
between 0-39 will return a fail value.

Sample Code
-----------

/* compile with : cl /Od /Zi file.c */

#define INCL_DOSFILEMGR

#include <stdio.h>
#include <os2.h>

void main(void)
{
   int i;
   for ( i = 0 ; i < 1000 ; i ++ )

   if ( DosSetMaxFH ( i ) )
   {
      printf ( " DosSetMaxFH to %d failed!\n ",i ) ;
   }
}

This program prints the error message on parameters from 0 to 39.

You can call the DosSetMaxFH routine to set at least 40 file handles
to work around this problem.

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