coreleft
函数名: coreleft
功 能: 返回未使用内存的大小
用 法: unsigned coreleft(void);
程序例:
#include <stdio.h>
#include <alloc.h>
int main(void)
{
printf("The difference between the highest allocated block
and\n");
printf("the top of the heap is: %lu bytes\n", (unsigned long)
coreleft());
return 0;
}
sbrk
函数名: sbrk
功 能: 增加程序可用数据段空间，增加大小由参数 incr决定 。
用 法: char *sbrk(int incr);
程序例:
#include <stdio.h>
#include <alloc.h>
int main(void)
{
printf("Changing allocation with sbrk()\n");
printf("Before sbrk() call: %lu bytes free\n",
(unsigned long) coreleft());
sbrk(1000);
printf(" After sbrk() call: %lu bytes free\n",
(unsigned long) coreleft());
return 0;
}