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 address of the top of bss.
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 ALSO
brk (2), segattach (2), segflush (2) /proc/*/segment
DIAGNOSTICS
Sets
errstr . Segbrk returns
(void*)-1 on error.
BUGS
Segbrk is not fully defined or implemented.
In particular,
it cannot always return the top of bss
when called with a zero
addr argument.
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).