sb

来自「Algorithms for Image Processing and Comp」· 代码 · 共 34 行

@c ----------------------------------------------------------------------
@node sbrk, memory
@heading @code{sbrk}
@subheading Syntax

@example
#include <osfcn.h>

void *sbrk(int delta)
@end example

@subheading Description

This function changes the "break" of the program by adding @var{delta}
to it.  This is the highest address that your program can access without
causing a violation.  Since the heap is the region under the break, you
can expand the heap (where @code{malloc} gets memory from) by increasing
the break. 

This function is normally accessed only bu @code{malloc} (@pxref{malloc}).

@subheading Return Value

The address of the first byte outside of the valid address range, or -1
if no more memory could be accessed. 

@subheading Example

@example
char *buf;
buf = sbrk(1000); /* allocate space */
@end example