sbrk.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 34 行

#include <stdio.h>
#include <stdlib.h>

#if defined(M_I86)
#define alloc( x, y ) sbrk( x ); y = sbrk( 0 );
#else
#define alloc( x, y ) y = sbrk( x );
#endif

void main()
 {
    void *brk;

#if defined(M_I86)
    alloc( 0x0000, brk );
    /* calling printf will cause an allocation */
    printf( "Original break value %p\n", brk );
    printf( "Current amblksiz value %x\n", _amblksiz );
    alloc( 0x0000, brk );
    printf( "New break value after printf \t\t%p\n", brk );
#endif
    alloc( 0x3100, brk );
    printf( "New break value after sbrk( 0x3100 ) \t%p\n",
            brk );
    alloc( 0x0200, brk );
    printf( "New break value after sbrk( 0x0200 ) \t%p\n",
            brk );
#if defined(M_I86)
    alloc( -0x0100, brk );
    printf( "New break value after sbrk( -0x0100 ) \t%p\n",
            brk );
#endif
 }