View Source: sbrk(2) - Waikato Linux Users Group

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sbrk - change data segment size
!!SYNOPSIS
 __#include <unistd.h>__


 __void *sbrk(ptrdiff_t__ ''increment''__);__
!!DESCRIPTION
brk(2) 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(2) increments the program's data space by ''increment'' bytes. sbrk(2) isn't a system call, it is just a C library wrapper. Calling sbrk(2) with an increment of 0 can be used to find the current location of the program break.

!!RETURN VALUE
On success, sbrk(2) returns a pointer to the start of the new area. On error, -1 is returned, and ''errno'' is set to [ENOMEM].
!!CONFORMING TO
BSD 4.3

sbrk(2) is not defined in the C Standard and is deliberately excluded from the POSIX.1 standard (see paragraphs B.1.1.1.3 and B.8.3.3).

!!SEE ALSO
execve(2), getrlimit(2), malloc(3), brk(2)

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Last edited on Friday, April 11, 2003 1:19:46 am by PerryLorier

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