SEGBRK(2)SEGBRK(2)
NAME
segbrk – change memory allocation
SYNOPSIS
#include <u.h>
#include <libc.h>
void* segbrk(void *saddr, void *addr)
DESCRIPTION
Segbrk
sets the system’s idea of the lowest unused location of a segment
to
addr
rounded up to the next multiple of a page size, typically 4096 bytes.
The segment is identified by
saddr
which may be any valid address within the segment.
A call to
segbrk
with a zero
addr
argument returns the base address of the segment without
altering its size.
The system will prevent segments from overlapping and will not allow the
length of the
text, data, or stack segment to be altered.
SOURCE
/sys/src/libc/9syscall
SEE
brk(2),
segattach(2),
segflush(2)
/proc/*/segment
DIAGNOSTICS
Sets
errstr.
Segbrk
returns
(void*)-1
on error.
BUGS
The
segbrk
system call may go away or be re-implemented
to give more general segment control,
subsuming the functions of
brk(2),
segflush(2)
and
segfree
in
segattach(2).