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 。

返回值：函数调用成功返回一指针，指向新的内存空间。函数调用失败则返回 -1。

用 法:char *sbrk(int incr);

程序例:

#include <stdio.h>

#include <alloc.h>

int main(void)

{

printf("Changing allocation with sbrk()

");

printf("Before sbrk() call: %lu bytes free

",

(unsigned long) coreleft());

sbrk(1000);

printf(" After sbrk() call: %lu bytes free

",

(unsigned long) coreleft());

return 0;

}