setblock.c

开放源码的编译器open watcom 1.6.0版的源代码

#include <stdio.h>
#include <dos.h>

void main()
  {
    unsigned short segment;
    unsigned maxsize;

    /* Try to allocate 100 paragraphs, then free them */
    if( _dos_allocmem( 100, &segment ) != 0 ) {
      printf( "_dos_allocmem failed\n" );
      printf( "Only %u paragraphs available\n",segment);
    } else {
      printf( "_dos_allocmem succeeded\n" );
      /* Try to increase it to 200 paragraphs */
      if( _dos_setblock( 200, segment, &maxsize ) != 0 ){
        printf( "Unable to increase the size\n" );
      }
      if( _dos_freemem( segment ) != 0 ) {
        printf( "_dos_freemem failed\n" );
      }
    }
  }