1. Tech

Your suggestion is on its way!

An email with a link to:


was emailed to:

Thanks for sharing About.com with others!

Linux / Unix Command: sbrk
Command Library


brk, sbrk - change data segment size  


#include <unistd.h>

int brk(void *end_data_segment);

void *sbrk(ptrdiff_t increment);  


brk sets the end of the data segment to the value specified by end_data_segment, when that value is reasonable, the system does have enough memory and the process does not exceed its max data size (see setrlimit(2)).

sbrk increments the program's data space by increment bytes. sbrk isn't a system call, it is just a C library wrapper. Calling sbrk with an increment of 0 can be used to find the current location of the program break.  


On success, brk returns zero, and sbrk returns a pointer to the start of the new area. On error, -1 is returned, and errno is set to ENOMEM.  


BSD 4.3

brk and sbrk are not defined in the C Standard and are deliberately excluded from the POSIX.1 standard (see paragraphs B. and B.8.3.3).  


execve(2), getrlimit(2), malloc(3)

Important: Use the man command (% man) to see how a command is used on your particular computer.

>> Linux/Unix Command Library

>> Shell Command Library

Explore Linux
By Category
    linuxLinuxcomputeTechb0502bb1540001006c84963cb0502bb1540002006c818e0ahttp://linux.about.comod526F6F74132058liveGary Newelllinuxguide3TO004KpzNIP11970-01-0110/od/index.htm0526F6F741approved/od
  1. About.com
  2. Tech
  3. Linux

©2016 About.com. All rights reserved.