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

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BRK
!!!BRK
----
!!NAME

brk, sbrk - change data segment size
!!SYNOPSIS
 __#include <unistd.h>__
 __int brk(void *__''end_data_segment''__);__
 __void *sbrk(ptrdiff_t__ ''increment''__);__

!!DESCRIPTION
__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.
!!RETURN VALUE
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].

!!CONFORMING TO

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.1.1.1.3 and B.8.3.3).
!!SEE ALSO
execve(2), getrlimit(2), malloc(3)

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Last edited on Tuesday, October 29, 2002 11:33:11 pm by PerryLorier

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