sbrk

Changes the amount of space allocated for the data segment of the calling process.

Library:LibC

Classification:Single UNIX

Service:File and Directory I/O

Syntax

  #include <unistd.h> 
   
  void *sbrk (
     intptr_t   incr );

incr: (IN) Specifies the number of bytes to increase the break value. If the value is negative, the space decreases and break value is decrease by that number of bytes. If the value is 0, the current break value is returned.

If successful, returns the prior break value. Otherwise, returns (void *) -1 and sets errno to one of the following.

Decimal	Constant	Description
5	ENOMEM	No memory is available.
24	EAGAIN	No memory is currently available.
105	ENOCONTEXT	The calling thread has no context.