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CodeBlocksPortable/WATCOM/samples/goodies/handles.c

38 lines
1 KiB
C

/*
* HANDLES.C
* This C program grows the number of file handles so
* more than 16 files can be opened. This program
* illustrates the interaction between _grow_handles and
* the DOS 5.0 file system. If you are running a network
* such as Novell's NetWare, this will also affect the
* number of available file handles. In the actual trial,
* FILES=40 was specified in CONFIG.SYS.
*/
#include <stdio.h>
void main()
{
int i, j, maxh, maxo;
FILE *temp_files[50];
for( i = 25; i < 40; i++ ) {
/*
count 5 for stdin, stdout, stderr,
stdaux, and stdprn
*/
printf( "Trying for %2.2d handles...", 5 + i );
maxh = _grow_handles( 5 + i );
maxo = 0;
for( j = 0; j < maxh; j++ ) {
temp_files[j] = tmpfile();
if( temp_files[j] == NULL )break;
maxo++;
}
printf( " %d/%d temp files opened\n", maxo, maxh );
for( j = 0; j < maxo; j++ ) {
fclose( temp_files[j] );
}
}
}